JavaScript and Frames Quiz
226 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the primary purpose of a ResultSet object?

  • To represent a table of data from a database query. (correct)
  • To optimize database performance.
  • To manage database connections.
  • To create SQL statements.

    • In what manner does the default ResultSet cursor operate?

  • It resets to the first row after each iteration.
  • It only moves forward and is not updatable. (correct)
  • It can iterate through rows multiple times.
  • It supports backward movement through the rows.

    • Which method allows iteration through the rows of a ResultSet object?

  • first()
  • last()
  • next() (correct)
  • previous()

    • When retrieving values from the ResultSet, which method is generally more efficient?

    <p>Using the column index.</p> Signup and view all the answers

    Which of the following statements about ResultSet columns is correct?

    <p>Each column should be read only once for maximum portability.</p> Signup and view all the answers

    What happens when the next method is called on a ResultSet object and there are no more rows available?

    <p>It returns false.</p> Signup and view all the answers

    Which of the following describes the behavior of a scrollable ResultSet?

    <p>It permits movement to any row in the ResultSet.</p> Signup and view all the answers

    What type of ResultSet is created using the parameters TYPE_SCROLL_INSENSITIVE and CONCUR_UPDATABLE?

    <p>Scrollable and insensitive to external updates.</p> Signup and view all the answers

    What happens when multiple columns share the same name in a SQL query result set?

    <p>The first matching column value is returned.</p> Signup and view all the answers

    When using updater methods, what should a programmer do to ensure clarity in which column is being updated?

    <p>Ensure unique references through the SQL AS clause.</p> Signup and view all the answers

    Which method is used to update the current row in a ResultSet object after modifying data?

    <p>rs.updateRow()</p> Signup and view all the answers

    How does an updatable ResultSet handle new rows before they are committed to the database?

    <p>By providing a special row for staging the new row.</p> Signup and view all the answers

    What is the result when a Statement object generating a ResultSet is closed?

    <p>The ResultSet is automatically closed.</p> Signup and view all the answers

    Which method retrieves the value of a designated column as a stream of ASCII characters?

    <p>getAsciiStream(String columnLabel)</p> Signup and view all the answers

    Which fetch direction is indicated by FETCH_REVERSE in a ResultSet?

    <p>Processing rows from last to first.</p> Signup and view all the answers

    What is the output type of getBigDecimal(int columnIndex)?

    <p>BigDecimal</p> Signup and view all the answers

    Which method would you use to reset all changes made to the current row in a ResultSet?

    <p>rs.cancelRowUpdates()</p> Signup and view all the answers

    What does the method findColumn(String columnLabel) accomplish in a ResultSet?

    <p>It maps a column's label to its corresponding index.</p> Signup and view all the answers

    Which of the following methods is deprecated?

    <p>getBigDecimal(String columnLabel, int scale)</p> Signup and view all the answers

    Which method retrieves a stream of uninterpreted bytes for a specific column?

    <p>getBinaryStream(String columnLabel)</p> Signup and view all the answers

    What does the CLOSE_CURSORS_AT_COMMIT constant indicate regarding ResultSet objects?

    <p>They will be closed when the current transaction is committed.</p> Signup and view all the answers

    Which constant allows a ResultSet to be updated and provides bidirectional scrolling?

    <p>CONCUR_UPDATABLE</p> Signup and view all the answers

    What type is returned by the method getBoolean(String columnLabel)?

    <p>boolean</p> Signup and view all the answers

    Which method can be used to retrieve the fetch size of a ResultSet object?

    <p>getFetchSize()</p> Signup and view all the answers

    What is true about the TYPE_SCROLL_SENSITIVE constant?

    <p>It allows scrolling and is sensitive to data changes.</p> Signup and view all the answers

    What is returned by the getClob(String columnLabel) method?

    <p>A Clob object in Java</p> Signup and view all the answers

    What is the role of the ResultSetMetaData object?

    <p>To provide metadata about the ResultSet's columns.</p> Signup and view all the answers

    How can you retrieve the value of a designated column as a java.sql.Date object?

    <p>All of the above</p> Signup and view all the answers

    Which method would you call to advance the cursor to just after the last row of a ResultSet?

    <p>rs.afterLast()</p> Signup and view all the answers

    Which method should be used for a float retrieval in a ResultSet?

    <p>getFloat(int columnIndex)</p> Signup and view all the answers

    What kind of object is retrieved using the method getBlob(int columnIndex)?

    <p>A Blob object in Java</p> Signup and view all the answers

    Which method would you use to retrieve a byte array from a ResultSet?

    <p>getBytes(String columnLabel)</p> Signup and view all the answers

    What will be returned from getCursorName()?

    <p>The name of the SQL cursor</p> Signup and view all the answers

    Which method retrieves the concurrency mode of a ResultSet object?

    <p>getConcurrency()</p> Signup and view all the answers

    Which method retrieves a character stream for a designated column?

    <p>getCharacterStream(String columnLabel)</p> Signup and view all the answers

    What does the method getLong(int columnIndex) return?

    <p>The value of the designated column as a long in Java</p> Signup and view all the answers

    Which method would you use to get a Reader object for a specified column?

    <p>getNCharacterStream(int columnIndex)</p> Signup and view all the answers

    What value type does getNClob(String columnLabel) return?

    <p>An NClob object</p> Signup and view all the answers

    To retrieve the type of a ResultSet object, which method should you use?

    <p>getType()</p> Signup and view all the answers

    What does the method getTime(String columnLabel) return?

    <p>A java.sql.Time object for the designated column</p> Signup and view all the answers

    If you need to get the current row index from a ResultSet, which method would you use?

    <p>getRow()</p> Signup and view all the answers

    Which of the following methods is deprecated?

    <p>getUnicodeStream(int columnIndex)</p> Signup and view all the answers

    What type of object does getRef(int columnIndex) return?

    <p>A Ref object</p> Signup and view all the answers

    Which method will convert the SQL type of a column to the requested Java data type?

    <p>getObject(int columnIndex, Class type)</p> Signup and view all the answers

    To retrieve the number, types, and properties of columns in a ResultSet, which method is used?

    <p>getMetaData()</p> Signup and view all the answers

    What is returned by the method getTimestamp(int columnIndex)?

    <p>A java.sql.Timestamp object</p> Signup and view all the answers

    Which method allows the retrieval of an SQLXML object from a ResultSet?

    <p>getSQLXML(int columnIndex)</p> Signup and view all the answers

    How does getRowId(String columnLabel) differ from its int variant?

    <p>Retrieves the RowId based on the column label instead</p> Signup and view all the answers

    Which method retrieves the Statement object that created the ResultSet?

    <p>getStatement()</p> Signup and view all the answers

    Which method should be used instead of getUnicodeStream?

    <p>getCharacterStream</p> Signup and view all the answers

    What does the method getWarnings() return?

    <p>The first warning reported on the ResultSet</p> Signup and view all the answers

    What does the isBeforeFirst() method check?

    <p>If the cursor is positioned before the first row</p> Signup and view all the answers

    Which method allows you to refresh the current row with its latest value?

    <p>refreshRow</p> Signup and view all the answers

    What effect does the isClosed() method have?

    <p>Checks if the ResultSet is still open</p> Signup and view all the answers

    What is the purpose of the void insertRow() method?

    <p>Inserts the contents of the currently remembered row</p> Signup and view all the answers

    What does the relative(int rows) method do?

    <p>Moves the cursor a specified number of rows from its current position</p> Signup and view all the answers

    What type of value can be updated using updateBoolean(int columnIndex, boolean x)?

    <p>Boolean</p> Signup and view all the answers

    Which method is used to move the cursor to the last row of a ResultSet?

    <p>last()</p> Signup and view all the answers

    What is the function of the updateBlob(String columnLabel, Blob x) method?

    <p>Updates the column specified by label with a Blob value</p> Signup and view all the answers

    Which method moves the cursor to the previous row in a ResultSet?

    <p>previous()</p> Signup and view all the answers

    What does the rowUpdated() method indicate?

    <p>The current row has been modified</p> Signup and view all the answers

    Which of the following methods would you use to check if a cursor is on the first row?

    <p>isFirst()</p> Signup and view all the answers

    What is the role of the setFetchDirection(int direction) method?

    <p>Specifies the direction for processing rows in the ResultSet</p> Signup and view all the answers

    What is the purpose of the method updateByte(int columnIndex, byte x)?

    <p>It updates a column with a byte value.</p> Signup and view all the answers

    Which method allows updating a column with a character stream but specifies the number of bytes?

    <p>updateCharacterStream(int columnIndex, Reader x, int length)</p> Signup and view all the answers

    How does updateClob(int columnIndex, Reader reader, long length) function?

    <p>It updates the column using a Reader stream with a specified character length.</p> Signup and view all the answers

    What data type does updateDate(String columnLabel, Date x) accept for its second parameter?

    <p>java.sql.Date</p> Signup and view all the answers

    Which method updates a column with a NULL value?

    <p>Both A and B</p> Signup and view all the answers

    What is the function of updateNCharacterStream(int columnIndex, Reader x)?

    <p>It updates a designated column with a character stream value.</p> Signup and view all the answers

    What kind of value can be passed to updateObject(String columnLabel, Object x)?

    <p>Any object that can be represented in SQL</p> Signup and view all the answers

    What is the purpose of updateFloat(int columnIndex, float x)?

    <p>To update a column with a float value.</p> Signup and view all the answers

    Which method should be used to update a column with a NClob value?

    <p>updateNClob(int columnIndex, NClob nClob)</p> Signup and view all the answers

    What does updateBytes(String columnLabel, byte[] x) accomplish?

    <p>It updates a column with a byte array value.</p> Signup and view all the answers

    What does the method updateLong(int columnIndex, long x) specifically accept as a parameter?

    <p>A long value</p> Signup and view all the answers

    For which method is the second parameter 'scaleOrLength' not applicable?

    <p>updateDouble(int columnIndex, double x)</p> Signup and view all the answers

    Which of the following methods does not specify an alternative parameter type for handling objects?

    <p>updateObject(int columnIndex, Object x)</p> Signup and view all the answers

    What type does the method updateInt(String columnLabel, int x) work with?

    <p>Integer values</p> Signup and view all the answers

    What method would you use to update a column with a short value in a ResultSet?

    <p>updateShort(String columnLabel, short y)</p> Signup and view all the answers

    Which fetch direction constant indicates that the rows in a ResultSet will be processed from last to first?

    <p>FETCH_REVERSE</p> Signup and view all the answers

    Which of the following methods updates a column with a java.sql.SQLXML value?

    <p>updateSQLXML(int columnIndex, SQLXML xmlObject)</p> Signup and view all the answers

    What is the purpose of the method wasNull() in a ResultSet?

    <p>To determine if the last column read had a SQL NULL value</p> Signup and view all the answers

    Which constant indicates a ResultSet that can only be moved forward?

    <p>TYPE_FORWARD_ONLY</p> Signup and view all the answers

    What does the method updateRow() do in a ResultSet?

    <p>It updates the underlying database with the new contents of the current row</p> Signup and view all the answers

    Which of the following methods would you use to update a column with a java.sql.Time value?

    <p>updateTime(int columnIndex, java.sql.Time x)</p> Signup and view all the answers

    What is the significance of the FETCH_UNKNOWN constant?

    <p>It suggests that the fetch direction is not specified.</p> Signup and view all the answers

    Which method would update a column with a RowId value using the column's index?

    <p>updateRowId(int columnIndex, RowId x)</p> Signup and view all the answers

    The method next() serves what purpose in a ResultSet?

    <p>It moves the cursor forward one row from its current position.</p> Signup and view all the answers

    In a ResultSet, what does the constant CONCUR_UPDATABLE signify?

    <p>The ResultSet object allowing updates.</p> Signup and view all the answers

    Which method would you use to update a column with a String value using the column's label?

    <p>updateString(String columnLabel, String x)</p> Signup and view all the answers

    Which constant would you refer to for a ResultSet that is scrollable but not sensitive to changes?

    <p>TYPE_SCROLL_INSENSITIVE</p> Signup and view all the answers

    What will happen if you invoke a ResultSet method that requires a current row, but none exists?

    <p>It will throw a SQLException.</p> Signup and view all the answers

    What is the behavior of the next() method in a TYPE_FORWARD_ONLY ResultSet when called on a closed result set?

    <p>It will throw a SQLException.</p> Signup and view all the answers

    Which of the following is true regarding the close() method of a ResultSet?

    <p>It releases resources immediately.</p> Signup and view all the answers

    What happens to the ResultSet's warning chain when a new row is read?

    <p>It is cleared.</p> Signup and view all the answers

    After closing a ResultSet, what happens to the ResultSetMetaData instances created by getMetaData?

    <p>They remain accessible.</p> Signup and view all the answers

    When calling getBoolean(int columnIndex), what is the returned value if the designated column contains the value '0'?

    <p>false</p> Signup and view all the answers

    What is required before calling wasNull() after reading a value from a ResultSet?

    <p>Invoke one of the getter methods on a column.</p> Signup and view all the answers

    Which method will throw an SQLException if the columnIndex is not valid?

    <p>getString(int columnIndex)</p> Signup and view all the answers

    When invoking getByte(int columnIndex), what will be returned if the value is SQL NULL?

    <p>0</p> Signup and view all the answers

    If an input stream is open for the current row, what will happen when next() is called?

    <p>The input stream will be implicitly closed.</p> Signup and view all the answers

    What does the getShort(int columnIndex) method return if the last column value is SQL NULL?

    <p>0</p> Signup and view all the answers

    What type of SQL data does getInt(int columnIndex) return based on the content type?

    <p>Any numeric data type.</p> Signup and view all the answers

    What exception is thrown if you attempt to call any ResultSet methods after the ResultSet has been closed?

    <p>SQLException</p> Signup and view all the answers

    If the getInt(int columnIndex) method is called with an invalid columnIndex, what is the expected outcome?

    <p>It will throw an SQLException.</p> Signup and view all the answers

    Which method should be used to retrieve large LONGVARCHAR values in a stream of two-byte Unicode characters?

    <p>getCharacterStream</p> Signup and view all the answers

    What is the return value of a column in a ResultSet when its value is SQL NULL?

    <p>It returns 0.</p> Signup and view all the answers

    Which method in ResultSet retrieves the value as a long type?

    <p>getLong(String columnLabel)</p> Signup and view all the answers

    What is the return type of the method getBoolean when retrieving a value from a ResultSet?

    <p>boolean</p> Signup and view all the answers

    What occurs when the next call to a getter method is made after reading data from a stream?

    <p>The stream implicitly closes.</p> Signup and view all the answers

    What exception is thrown if the columnLabel is not valid in a ResultSet method?

    <p>SQLException</p> Signup and view all the answers

    Which method should be used to retrieve a value as uninterpreted bytes suitable for large LONGVARBINARY values?

    <p>getBinaryStream</p> Signup and view all the answers

    Which of the following is a correctly deprecated method in ResultSet?

    <p>getBigDecimal(String columnLabel, int scale)</p> Signup and view all the answers

    What is returned by the getLong method if the column value is SQL NULL?

    <p>0</p> Signup and view all the answers

    What is the primary purpose of the getCharacterStream method?

    <p>To access large LOBs in Unicode format.</p> Signup and view all the answers

    What must be true about the ResultSet when calling its methods to avoid exceptions?

    <p>It must be open.</p> Signup and view all the answers

    How is a column returned if the SQL AS clause is not specified for that column?

    <p>It returns the name of the column itself.</p> Signup and view all the answers

    Which of the following can cause an SQLException when calling the getFloat method?

    <p>A database access error occurs</p> Signup and view all the answers

    If a column retrieved is SQL NULL, what will the getString method return?

    <p>null</p> Signup and view all the answers

    Which method should be used instead of the deprecated getBigDecimal with a scale parameter?

    <p>Both A and B</p> Signup and view all the answers

    Which method retrieves the column value as a double in the ResultSet?

    <p>getDouble(String columnLabel)</p> Signup and view all the answers

    In the context of JDBC, which exception is thrown if an invalid column index is provided?

    <p>SQLException</p> Signup and view all the answers

    A SQL access error during ResultSet operations will result in which exception?

    <p>SQLException</p> Signup and view all the answers

    What is the return type when using getDate method on a ResultSet object?

    <p>java.sql.Date</p> Signup and view all the answers

    Which parameter specifies the column to retrieve when using the method getByte?

    <p>columnLabel</p> Signup and view all the answers

    What is the expected output when calling getBigDecimal(String columnLabel) with a SQL NULL value?

    <p>It returns null.</p> Signup and view all the answers

    What does the input stream returned by getBinaryStream deliver?

    <p>A stream of uninterpreted bytes</p> Signup and view all the answers

    If getBytes is called on a closed result set, what will happen?

    <p>It throws an SQLException.</p> Signup and view all the answers

    What type does the method getByte return when fetching a column value from a ResultSet?

    <p>byte</p> Signup and view all the answers

    Which data type is returned by the getBytes(String columnLabel) method?

    <p>byte array</p> Signup and view all the answers

    What is the significance of the columnIndex parameter in these ResultSet methods?

    <p>It starts at 1 for the first column.</p> Signup and view all the answers

    Which method should be used for retrieving values in a character stream with a downgrade from Unicode to ASCII?

    <p>getCharacterStream</p> Signup and view all the answers

    What does the scale parameter in getBigDecimal(String columnLabel, int scale) represent?

    <p>The number of digits to the right of the decimal point.</p> Signup and view all the answers

    What happens if an invalid column index is used with the getTimestamp method?

    <p>It throws an SQLException.</p> Signup and view all the answers

    How does the JDBC driver handle conversion from database format while retrieving data?

    <p>The JDBC driver automatically does necessary conversions.</p> Signup and view all the answers

    If a method is called on a closed ResultSet, what happens?

    <p>It throws a SQLException.</p> Signup and view all the answers

    What does the getAsciiStream method provide?

    <p>A stream of ASCII characters.</p> Signup and view all the answers

    When calling getDouble on a column with a SQL NULL value, what is the result?

    <p>The value returned is 0.</p> Signup and view all the answers

    What will happen if you try to access a column in a ResultSet that has been closed?

    <p>A SQLException will be thrown.</p> Signup and view all the answers

    What is returned by getBigDecimal(int columnIndex) method when the column value is SQL NULL?

    <p>null</p> Signup and view all the answers

    Which method retrieves a value as a java.sql.Time object?

    <p>getTime(int columnIndex)</p> Signup and view all the answers

    What will getFloat(int columnIndex) return if the column value is not of float type?

    <p>It will convert the value to float.</p> Signup and view all the answers

    Which exception is specifically mentioned for unsupported method calls on a JDBC driver?

    <p>SQLFeatureNotSupportedException</p> Signup and view all the answers

    What should you expect when the column value is SQL NULL with the getBytes method?

    <p>null.</p> Signup and view all the answers

    What will be returned when the getDate method is invoked with a columnLabel that is invalid?

    <p>SQLException indicating invalid columnLabel</p> Signup and view all the answers

    What is the result of calling getAsciiStream after retrieving another column's value?

    <p>It will close the previous stream and may return zero bytes</p> Signup and view all the answers

    If a column value retrieved by getTime is SQL NULL, what will be the result?

    <p>The method will return null</p> Signup and view all the answers

    Under which circumstance will calling getUnicodeStream lead to a SQLFeatureNotSupportedException?

    <p>When the JDBC driver does not support this method</p> Signup and view all the answers

    When retrieving the value of a designated column using getTimestamp, what type of object is returned?

    <p>java.sql.Timestamp</p> Signup and view all the answers

    What happens when you try to retrieve a column value using getBinaryStream method after closing the ResultSet?

    <p>It throws an SQLException</p> Signup and view all the answers

    What is required as a parameter when invoking the getTime method?

    <p>The label for the column specified with SQL AS clause</p> Signup and view all the answers

    Which scenario would lead to a SQLException when using getDate?

    <p>The columnLabel refers to a non-existent column</p> Signup and view all the answers

    What happens when reading an ASCII stream prior to getting value from any other column?

    <p>The ASCII stream closes automatically</p> Signup and view all the answers

    Which method should be used to retrieve a stream of two-byte Unicode characters?

    <p>getCharacterStream</p> Signup and view all the answers

    Which of the following will not be returned when invoking getBinaryStream for a column with SQL NULL?

    <p>A stream containing the actual bytes</p> Signup and view all the answers

    Which exception is thrown when trying to access data from a closed ResultSet?

    <p>SQLException</p> Signup and view all the answers

    What will getCharacterStream do that is similar to getUnicodeStream?

    <p>Provide a streaming input mechanism</p> Signup and view all the answers

    What is a critical aspect to remember when using getAsciiStream?

    <p>All data must be read before accessing another column</p> Signup and view all the answers

    What happens to the warning chain when a new row is read from a ResultSet object?

    <p>The warning chain is cleared.</p> Signup and view all the answers

    Which of the following statements is true regarding the getObject method when retrieving an SQL NULL value?

    <p>It returns a Java null.</p> Signup and view all the answers

    What SQL feature does the getCursorName method support?

    <p>Positioned update/delete statements.</p> Signup and view all the answers

    Which exception might be thrown by the getWarnings method?

    <p>SQLException</p> Signup and view all the answers

    When is the warning chain for a ResultSet cleared?

    <p>Upon reading a new row.</p> Signup and view all the answers

    What is the primary outcome when calling clearWarnings on a ResultSet object?

    <p>It removes all previously reported warnings.</p> Signup and view all the answers

    What does the method getMetaData return?

    <p>The description of the ResultSet object's columns.</p> Signup and view all the answers

    Which scenario may lead to an SQLFeatureNotSupportedException when using getCursorName?

    <p>The JDBC driver does not support this method.</p> Signup and view all the answers

    What does the method getObject(int columnIndex) require as a parameter?

    <p>The index of the column starting from 1.</p> Signup and view all the answers

    When a method is called on a closed ResultSet, what is the expected outcome?

    <p>The method throws a SQLException.</p> Signup and view all the answers

    Which method allows retrieval of specific column data as a Java object?

    <p>getObject</p> Signup and view all the answers

    In what situation will the getWarnings method return null?

    <p>If there are no warnings reported.</p> Signup and view all the answers

    Which method is used to obtain the label for a specific column within a ResultSet?

    <p>getColumnLabel</p> Signup and view all the answers

    Which method can be used to obtain a stream of uninterpreted bytes for a designated column?

    <p>getBinaryStream</p> Signup and view all the answers

    What will occur if an invalid column label is provided to getObject(String columnLabel)?

    <p>The method throws a SQLException.</p> Signup and view all the answers

    What does the method getObject(columnLabel) return when called on a SQL user-defined type in a ResultSet?

    <p>A java.lang.Object holding the column value</p> Signup and view all the answers

    What exception is thrown if an invalid column label is passed to the findColumn method?

    <p>SQLException</p> Signup and view all the answers

    Which method is designed to retrieve the value of a specified column as a Reader object from a ResultSet?

    <p>getCharacterStream</p> Signup and view all the answers

    What is the return type of the method getBigDecimal(int columnIndex)?

    <p>java.math.BigDecimal</p> Signup and view all the answers

    What does the method isAfterLast() indicate about the cursor's position in a ResultSet?

    <p>The cursor is after the last row</p> Signup and view all the answers

    Which of the following conditions will NOT throw an SQLException when invoking getCharacterStream(String columnLabel)?

    <p>The desired column contains SQL NULL</p> Signup and view all the answers

    What does the method getBigDecimal(String columnLabel) specifically retrieve?

    <p>The designated column value as a BigDecimal</p> Signup and view all the answers

    What is the purpose of the isBeforeFirst() method in a ResultSet?

    <p>To check if the cursor is positioned before the first row</p> Signup and view all the answers

    Which parameter is used to specify the column's position in the getCharacterStream(int columnIndex) method?

    <p>columnIndex</p> Signup and view all the answers

    What will happen if the getObject method is called on a closed ResultSet?

    <p>It will throw an SQLException</p> Signup and view all the answers

    In what situation would the findColumn method throw a SQLException?

    <p>When an invalid columnLabel is provided</p> Signup and view all the answers

    What does the method getCharacterStream(int columnIndex) return if the selected column value is SQL NULL?

    <p>null</p> Signup and view all the answers

    What type of value does the isBeforeFirst method return when the cursor is positioned before the first row?

    <p>true</p> Signup and view all the answers

    Which method is called to determine the cursor's position in a ResultSet when it is after the last row?

    <p>isAfterLast()</p> Signup and view all the answers

    What does the method afterLast do in a ResultSet object?

    <p>Moves the cursor just after the last row.</p> Signup and view all the answers

    What is the return value of the isLast method when there are no rows in the ResultSet?

    <p>False</p> Signup and view all the answers

    Which exception is thrown if the getRow method is called on a closed ResultSet?

    <p>SQLException</p> Signup and view all the answers

    When calling the absolute method with a negative integer, what does the cursor position itself to?

    <p>The row at the given position from the end of the ResultSet.</p> Signup and view all the answers

    What would happen if beforeFirst is called on a ResultSet that contains no rows?

    <p>The cursor remains at its current position.</p> Signup and view all the answers

    What is the purpose of the isFirst method in a ResultSet object?

    <p>To determine if the cursor is on the first row.</p> Signup and view all the answers

    What will be the return value of first() if the ResultSet is empty?

    <p>False</p> Signup and view all the answers

    Why may calling isLast be considered an expensive operation?

    <p>It fetches ahead a row to check if the current row is the last.</p> Signup and view all the answers

    What happens if the cursor attempts to move beyond the boundaries of the ResultSet using absolute method?

    <p>The cursor moves to before the first or after the last row.</p> Signup and view all the answers

    What is returned by the getRow method when there is no current row?

    <p>0</p> Signup and view all the answers

    Which of the following is NOT an exception that can be thrown by the isAfterLast method?

    <p>IndexOutOfBoundsException</p> Signup and view all the answers

    If a ResultSet has no rows and the method afterLast is called, what effect does it have?

    <p>The cursor still moves to just after the last row, unaffected by row count.</p> Signup and view all the answers

    What is the result of calling the last() method on an empty ResultSet?

    <p>False</p> Signup and view all the answers

    What exception is thrown when the rowUpdated method is called on a closed result set?

    <p>SQLException</p> Signup and view all the answers

    Which concurrency mode allows for updating the current row in a ResultSet?

    <p>ResultSet.CONCUR_UPDATABLE</p> Signup and view all the answers

    What is the returned type of the rowInserted method if an insertion is detected?

    <p>boolean</p> Signup and view all the answers

    Which method should be used to update a designated column with an integer value?

    <p>updateInt(int columnIndex, int x)</p> Signup and view all the answers

    What type does the updateNull method accept for its parameter?

    <p>int</p> Signup and view all the answers

    What is the significance of the method rowDeleted in a ResultSet object?

    <p>Detects if a row has been logically deleted.</p> Signup and view all the answers

    Which exception may occur if the updateBoolean method is not supported by the JDBC driver?

    <p>SQLFeatureNotSupportedException</p> Signup and view all the answers

    What indicates whether visible updates can be detected in a ResultSet?

    <p>getConcurrency method</p> Signup and view all the answers

    When is the value of rowUpdated expected to return false?

    <p>When the ResultSet is read-only.</p> Signup and view all the answers

    Which method allows updates on a column index without changing the underlying database until explicitly called?

    <p>updateRow</p> Signup and view all the answers

    What does the return value of rowInserted method indicate?

    <p>Whether the current row is identified as inserted.</p> Signup and view all the answers

    Which class provides the ability to determine if deletes are detected in a ResultSet?

    <p>DatabaseMetaData</p> Signup and view all the answers

    What can be inferred if an SQLException is thrown when invoking an update method?

    <p>The column index is likely invalid.</p> Signup and view all the answers

    What will happen if the cursor is moved beyond the last row of a ResultSet object using the relative method?

    <p>The cursor is positioned after the last row.</p> Signup and view all the answers

    What does the setFetchSize(int rows) method influence regarding the ResultSet?

    <p>The number of rows fetched from the database when more rows are needed.</p> Signup and view all the answers

    If a programmer calls getFetchDirection() on a closed ResultSet, what is the expected outcome?

    <p>An SQLException is thrown.</p> Signup and view all the answers

    What is the result of calling the previous() method when the cursor is already positioned before the first row?

    <p>The method returns false.</p> Signup and view all the answers

    Which statement accurately describes the function of the relative(int rows) method?

    <p>Moves the cursor relative to its current position.</p> Signup and view all the answers

    What should a developer expect if they call setFetchDirection(int direction) with FETCH_FORWARD on a ResultSet type that is TYPE_FORWARD_ONLY?

    <p>The fetch direction does not change.</p> Signup and view all the answers

    Which method can be used to determine if the cursor is currently on a valid row?

    <p>previous()</p> Signup and view all the answers

    What will be the result of calling the method absolute(0) on a ResultSet?

    <p>The cursor is positioned before the first row.</p> Signup and view all the answers

    Which of the following can result in an SQLFeatureNotSupportedException being thrown?

    <p>Using absolute(-1) on a TYPE_FORWARD_ONLY result set.</p> Signup and view all the answers

    What type of value will the getFetchSize() method return?

    <p>The current fetch size for this ResultSet object.</p> Signup and view all the answers

    Calling relative(0) on a ResultSet object has what effect?

    <p>The cursor remains on the current row but doesn't change position.</p> Signup and view all the answers

    What would happen if the cursor is moved using absolute(1) on a TYPE_FORWARD_ONLY ResultSet?

    <p>The cursor moves to the second row.</p> Signup and view all the answers

    What does setting the fetch direction to FETCH_UNKNOWN imply for the ResultSet?

    <p>The driver may ignore direction hints.</p> Signup and view all the answers

    If you attempt to execute previous() on a closed ResultSet, what occurs?

    <p>An SQLException is thrown.</p> Signup and view all the answers

    Study Notes

    JavaScript and Frames

    • Frames are a feature used for web pages.
    • Disabling JavaScript in your browser prevents the document from functioning as intended.
    • If JavaScript is disabled, you will see a message indicating that frames are required.
    • A link to a non-frame version of the document is provided as an alternative.

    Browser Functionality

    • The text indicates the document is designed to be viewed using browser frames.
    • Frames allow for a page to be split into multiple sections, each with its own independent content.
    • The text specifies that the document is unsuitable for use with web clients that don't support frames.
    • A link is provided for viewing the document in a non-frame format.

    ResultSet Interface

    • Represents a database result set: Usually generated by executing a statement that queries a database.
    • Maintains a cursor: Points to the current row of data.
    • Cursor initially positioned before the first row: The next() method moves the cursor to the next row.
    • Default ResultSet object: Not updatable and has a forward-only cursor.
    • Methods for column value retrieval: getBoolean(), getLong(), etc. using column index or name.
    • Column indexing: Starts from 1.
    • ResultSet objects can be scrollable and/or updatable: TYPE_SCROLL_INSENSITIVE, CONCUR_UPDATABLE are used to achieve this.
    • Getter methods: Attempt to convert underlying data to the specified Java type.
    • Column names are case insensitive: When several columns have the same name, the first match is returned.
    • Updater methods: Added in JDBC 2.0 API.
      • Used to update a column value in the current row.
      • Used to insert a new row into the ResultSet and the data source.
    • ResultSet object automatically closed: When the Statement object that generated it is closed, re-executed, or used to retrieve the next result from a sequence of multiple results.
    • ResultSetMetaData object: Provides information about the columns of a result set - number, types, and properties.

    ResultSet Interface Methods

    • getUnicodeStream(int columnIndex): Retrieves a Unicode stream from the specified column. It is deprecated and recommends using getCharacterStream instead.
    • getUnicodeStream(String columnLabel): Retrieves a Unicode stream from the specified column by label. It is deprecated and recommends using getCharacterStream instead.
    • getURL(int columnIndex): Retrieves the value of the designated column in the current row as a java.net.URL object.
    • getURL(String columnLabel): Retrieves the value of the designated column in the current row as a java.net.URL object.
    • getWarnings(): Retrieves the first warning reported by calls on this ResultSet object.
    • insertRow(): Inserts the contents of the insert row into the ResultSet object and the database.
    • isAfterLast(): Indicates if the cursor is positioned after the last row in the ResultSet.
    • isBeforeFirst(): Indicates if the cursor is positioned before the first row in the ResultSet.
    • isClosed(): Indicates if the ResultSet object has been closed.
    • isFirst(): Indicates if the cursor is positioned on the first row in the ResultSet.
    • isLast(): Indicates if the cursor is positioned on the last row in the ResultSet.
    • last(): Moves the cursor to the last row in the ResultSet.
    • moveToCurrentRow(): Moves the cursor to the remembered cursor position, typically the current row.
    • moveToInsertRow(): Moves the cursor to the insert row.
    • next(): Moves the cursor forward one row.
    • previous(): Moves the cursor to the previous row in the ResultSet.
    • refreshRow(): Refreshes the current row with its most recent value from the database.
    • relative(int rows): Moves the cursor a relative number of rows, either positive or negative.
    • rowDeleted(): Indicates if a row has been deleted.
    • rowInserted(): Indicates if the current row has had an insertion.
    • rowUpdated(): Indicates if the current row has been updated.
    • setFetchDirection(int direction): Gives a hint to the driver about the direction the ResultSet will be processed.
    • setFetchSize(int rows): Hints to the JDBC driver about the number of rows to fetch from the database when more rows are needed.
    • updateArray(int columnIndex, Array x): Updates the designated column with a java.sql.Array value.
    • updateArray(String columnLabel, Array x): Updates the designated column with a java.sql.Array value by label.
    • updateAsciiStream(int columnIndex, InputStream x): Updates the designated column with an ASCII stream value.
    • updateAsciiStream(int columnIndex, InputStream x, int length): Updates the designated column with an ASCII stream value, specifying the length of the stream in bytes.
    • updateAsciiStream(int columnIndex, InputStream x, long length): Updates the designated column with an ASCII stream value, specifying the length of the stream in bytes.
    • updateAsciiStream(String columnLabel, InputStream x): Updates the designated column with an ASCII stream value by label.
    • updateAsciiStream(String columnLabel, InputStream x, int length): Updates the designated column with an ASCII stream value by label, specifying the length of the stream in bytes.
    • updateAsciiStream(String columnLabel, InputStream x, long length): Updates the designated column with an ASCII stream value by label, specifying the length of the stream in bytes.
    • updateBigDecimal(int columnIndex, BigDecimal x): Updates the designated column with a java.math.BigDecimal value.
    • updateBigDecimal(String columnLabel, BigDecimal x): Updates the designated column with a java.sql.BigDecimal value by label.
    • updateBinaryStream(int columnIndex, InputStream x): Updates the designated column with a binary stream value.
    • updateBinaryStream(int columnIndex, InputStream x, int length): Updates the designated column with a binary stream value, specifying the length of the stream in bytes.
    • updateBinaryStream(int columnIndex, InputStream x, long length): Updates the designated column with a binary stream value, specifying the length of the stream in bytes.
    • updateBinaryStream(String columnLabel, InputStream x): Updates the designated column with a binary stream value by label.
    • updateBinaryStream(String columnLabel, InputStream x, int length): Updates the designated column with a binary stream value by label, specifying the length of the stream in bytes.
    • updateBinaryStream(String columnLabel, InputStream x, long length): Updates the designated column with a binary stream value by label, specifying the length of the stream in bytes.
    • updateBlob(int columnIndex, Blob x): Updates the designated column with a java.sql.Blob value.
    • updateBlob(int columnIndex, InputStream inputStream): Updates the designated column with a Blob value using the given input stream.
    • updateBlob(int columnIndex, InputStream inputStream, long length): Updates the designated column with a Blob value using the given input stream, specifying the length of the stream in bytes.
    • updateBlob(String columnLabel, Blob x): Updates the designated column with a java.sql.Blob value by label.
    • updateBlob(String columnLabel, InputStream inputStream): Updates the designated column with a Blob value using the given input stream by label.
    • updateBlob(String columnLabel, InputStream inputStream, long length): Updates the designated column with a Blob value using the given input stream by label, specifying the length of the stream in bytes.
    • updateBoolean(int columnIndex, boolean x): Updates the designated column with a boolean value.
    • updateBoolean(String columnLabel, boolean x): Updates the designated column with a boolean value by label.
    • updateByte(int columnIndex, byte x): Updates the designated column with a byte value.
    • updateByte(String columnLabel, byte x): Updates the designated column with a byte value by label.
    • updateBytes(int columnIndex, byte[] x): Updates the designated column with a byte array value.
    • updateBytes(String columnLabel, byte[] x): Updates the designated column with a byte array value by label.
    • updateCharacterStream(int columnIndex, Reader x): Updates the designated column with a character stream value.
    • updateCharacterStream(int columnIndex, Reader x, int length): Updates the designated column with a character stream value, specifying the length of the stream in bytes.
    • updateCharacterStream(int columnIndex, Reader x, long length): Updates the designated column with a character stream value, specifying the length of the stream in bytes.
    • updateCharacterStream(String columnLabel, Reader reader): Updates the designated column with a character stream value by label.
    • updateCharacterStream(String columnLabel, Reader reader, int length): Updates the designated column with a character stream value by label, specifying the length of the stream in bytes.
    • updateCharacterStream(String columnLabel, Reader reader, long length): Updates the designated column with a character stream value by label, specifying the length of the stream in bytes.
    • updateClob(int columnIndex, Clob x): Updates the designated column with a java.sql.Clob value.
    • updateClob(int columnIndex, Reader reader): Updates the designated column with a Clob value using the given Reader object.
    • updateClob(int columnIndex, Reader reader, long length): Updates the designated column with a Clob value using the given Reader object, specifying the length of the stream in characters.
    • updateClob(String columnLabel, Clob x): Updates the designated column with a java.sql.Clob value by label.
    • updateClob(String columnLabel, Reader reader): Updates the designated column with a Clob value using the given Reader object by label.
    • updateClob(String columnLabel, Reader reader, long length): Updates the designated column with a Clob value using the given Reader object by label, specifying the length of the stream in characters.
    • updateDate(int columnIndex, Date x): Updates the designated column with a java.sql.Date value.
    • updateDate(String columnLabel, Date x): Updates the designated column with a java.sql.Date value by label.
    • updateDouble(int columnIndex, double x): Updates the designated column with a double value.
    • updateDouble(String columnLabel, double x): Updates the designated column with a double value by label.
    • updateFloat(int columnIndex, float x): Updates the designated column with a float value.
    • updateFloat(String columnLabel, float x): Updates the designated column with a float value by label.
    • updateInt(int columnIndex, int x): Updates the designated column with an int value.
    • updateInt(String columnLabel, int x): Updates the designated column with an int value by label.
    • updateLong(int columnIndex, long x): Updates the designated column with a long value.
    • updateLong(String columnLabel, long x): Updates the designated column with a long value by label.
    • updateNCharacterStream(int columnIndex, Reader x): Updates the designated column with a character stream value.
    • updateNCharacterStream(int columnIndex, Reader x, long length): Updates the designated column with a character stream value, specifying the length of the stream in bytes.
    • updateNCharacterStream(String columnLabel, Reader reader): Updates the designated column with a character stream value by label.
    • updateNCharacterStream(String columnLabel, Reader reader, long length): Updates the designated column with a character stream value by label, specifying the length of the stream in bytes.
    • updateNClob(int columnIndex, NClob nClob): Updates the designated column with a java.sql.NClob value.
    • updateNClob(int columnIndex, Reader reader): Updates the designated column with a NClob value using the given Reader object.
    • updateNClob(int columnIndex, Reader reader, long length): Updates the designated column with a NClob value using the given Reader object, specifying the length of the stream in characters.
    • updateNClob(String columnLabel, NClob nClob): Updates the designated column with a java.sql.NClob value by label.
    • updateNClob(String columnLabel, Reader reader): Updates the designated column with a NClob value using the given Reader object by label.
    • updateNClob(String columnLabel, Reader reader, long length): Updates the designated column with a NClob value using the given Reader object by label, specifying the length of the stream in characters.
    • updateNString(int columnIndex, String nString): Updates the designated column with a String value.
    • updateNString(String columnLabel, String nString): Updates the designated column with a String value by label.
    • updateNull(int columnIndex): Updates the designated column with a null value.
    • updateNull(String columnLabel): Updates the designated column with a null value by label.
    • updateObject(int columnIndex, Object x): Updates the designated column with an Object value.
    • updateObject(int columnIndex, Object x, int scaleOrLength): Updates the designated column with an Object value, specifying the scale or length of the object.
    • updateObject(int columnIndex, Object x, SQLType targetSqlType): Updates the designated column with an Object value, specifying the target SQL type.
    • updateObject(int columnIndex, Object x, SQLType targetSqlType, int scaleOrLength): Updates the designated column with an Object value, specifying the target SQL type and scale or length.
    • updateObject(String columnLabel, Object x): Updates the designated column with an Object value by label.
    • updateObject(String columnLabel, Object x, int scaleOrLength): Updates the designated column with an Object value by label, specifying the scale or length of the object.
    • updateObject(String columnLabel, Object x, SQLType targetSqlType): Updates the designated column with an Object value by label, specifying the target SQL type.
    • updateObject(String columnLabel, Object x, SQLType targetSqlType, int scaleOrLength): Updates the designated column with an Object value by label, specifying the target SQL type and scale or length.
    • updateRef(int columnIndex, Ref x): Updates the designated column with a java.sql.Ref value.
    • updateRef(String columnLabel, Ref x): Updates the designated column with a java.sql.Ref value by label.
    • updateRow(): Updates the underlying database with the new content of the current row in the ResultSet.
    • updateRowId(int columnIndex, RowId x): Updates the designated column with a RowId value.
    • updateRowId(String columnLabel, RowId x): Updates the designated column with a RowId value by label.
    • updateShort(int columnIndex, short x): Updates the designated column with a short value.
    • updateShort(String columnLabel, short x): Updates the designated column with a short value by label.
    • updateSQLXML(int columnIndex, SQLXML xmlObject): Updates the designated column with a java.sql.SQLXML value.
    • updateSQLXML(String columnLabel, SQLXML xmlObject): Updates the designated column with a java.sql.SQLXML value by label.
    • updateString(int columnIndex, String x): Updates the designated column with a String value.
    • updateString(String columnLabel, String x): Updates the designated column with a String value by label.
    • updateTime(int columnIndex, Time x): Updates the designated column with a java.sql.Time value.
    • updateTime(String columnLabel, Time x): Updates the designated column with a java.sql.Time value by label.
    • updateTimestamp(int columnIndex, Timestamp x): Updates the designated column with a java.sql.Timestamp value.
    • updateTimestamp(String columnLabel, Timestamp x): Updates the designated column with a java.sql.Timestamp value by label.
    • wasNull(): Indicates if the last column read had a value of SQL NULL.

    ResultSet Interface Constants

    • FETCH_FORWARD: Indicates the rows in the result set are processed in the forward direction (first to last).
    • FETCH_REVERSE: Indicates the rows in the result set are processed in reverse (last to first).
    • FETCH_UNKNOWN: Indicates the order of processing rows in the result set is unknown.
    • TYPE_FORWARD_ONLY: Indicates the result set allows the cursor to move only forward.
    • TYPE_SCROLL_INSENSITIVE: Indicates the result set is scrollable and generally not sensitive to data changes.
    • TYPE_SCROLL_SENSITIVE: Indicates the result set is scrollable and generally sensitive to data changes.
    • CONCUR_READ_ONLY: Indicates the concurrency mode for a result set that cannot be updated.
    • CONCUR_UPDATABLE: Indicates the concurrency mode for a result set that can be updated.
    • HOLD_CURSORS_OVER_COMMIT: Indicates open ResultSet objects with this holdability will remain open when the current transaction is committed.
    • CLOSE_CURSORS_AT_COMMIT: Indicates open ResultSet objects with this holdability will be closed when the current transaction is committed.

    ResultSet Methods

    • The wasNull method returns true if the last column value read was SQL NULL and false otherwise.
    • wasNull throws an SQLException if a database access error occurs or the method is called on a closed result set.
    • The getString method returns the value of the designated column in the current row as a String in the Java programming language.
    • getString throws an SQLException if the column index is invalid, a database access error occurs or the method is called on a closed result set.
    • The getBoolean method retrieves the designated column value as a boolean in the Java programming language.
    • A "0" value in CHAR or VARCHAR or BIT, TINYINT, SMALLINT, INTEGER, or BIGINT is returned as false, and "1" is returned as true.
    • getBoolean throws an SQLException if the column index is invalid, a database access error occurs or the method is called on a closed result set.
    • The getByte method returns the designated column value as a byte in the Java programming language.
    • getByte throws an SQLException if the column index is invalid, a database access error occurs or the method is called on a closed result set.
    • The getShort method returns the designated column value as a short in the Java programming language.
    • getShort throws an SQLException if the column index is invalid, a database access error occurs or the method is called on a closed result set.
    • The getInt method returns the designated column value as an int in the Java programming language.
    • getInt throws an SQLException if the column index is invalid, a database access error occurs or the method is called on a closed result set.
    • The getLong method returns the designated column value as a long in the Java programming language.
    • getLong throws an SQLException if the column index is invalid, a database access error occurs or the method is called on a closed result set.
    • The getFloat method returns the designated column value as a float in the Java programming language.
    • getFloat throws an SQLException if the column index is invalid, a database access error occurs or the method is called on a closed result set.
    • The getDouble method returns the designated column value as a double in the Java programming language.
    • getDouble throws an SQLException if the column index is invalid, a database access error occurs or the method is called on a closed result set.
    • The getBigDecimal method returns the designated column value as a java.sql.BigDecimal in the Java programming language.
    • getBigDecimal throws an SQLException if the column index is invalid, a database access error occurs or the method is called on a closed result set, or a SQLFeatureNotSupportedException if the JDBC driver does not support this method.
    • The getBytes method returns the designated column value as a byte array in the Java programming language.
    • getBytes throws an SQLException if the column index is invalid, a database access error occurs or the method is called on a closed result set.
    • The getDate method returns the designated column value as a java.sql.Date object in the Java programming language.
    • getDate throws an SQLException if the column index is invalid, a database access error occurs or the method is called on a closed result set.
    • The getTime method returns the designated column value as a java.sql.Time object in the Java programming language.
    • getTime throws an SQLException if the column index is invalid, a database access error occurs or the method is called on a closed result set.
    • The getTimestamp method returns the designated column value as a java.sql.Timestamp object in the Java programming language.
    • getTimestamp throws an SQLException if the column index is invalid, a database access error occurs or the method is called on a closed result set.
    • The getAsciiStream method returns the designated column value as a stream of ASCII characters.
    • getAsciiStream is suitable for retrieving large LONGVARCHAR values. The JDBC driver will do any necessary conversion from the database format into ASCII.
    • getAsciiStream throws an SQLException if the column index is invalid, a database access error occurs or the method is called on a closed result set.
    • The getUnicodeStream method returns the designated column value as a stream of two-byte Unicode characters.
    • getUnicodeStream is suitable for retrieving large LONGVARCHAR values. The JDBC driver will do any necessary conversion from the database format into Unicode.
    • getUnicodeStream throws an SQLException if the column index is invalid, a database access error occurs or the method is called on a closed result set, or a SQLFeatureNotSupportedException if the JDBC driver does not support this method.
    • The getBinaryStream method returns the designated column value as a stream of uninterpreted bytes.
    • getBinaryStream is suitable for retrieving large LONGVARBINARY values.
    • getBinaryStream throws an SQLException if the column index is invalid, a database access error occurs or the method is called on a closed result set.

    Methods with Column Label Arguments

    • These methods are similar to the methods using column indexes, but they accept a columnLabel as an argument.
    • columnLabel is the label defined in the SQL AS clause. If not specified, it is the column name.
    • These methods also throw an SQLException if the columnLabel is invalid, a database access error occurs, or the method is called on a closed result set.### ResultSet Object Methods
    • The ResultSet object represents the results of a database query.
    • The ResultSet object is accessible from the Statement object that executed the query.
    • ResultSet object methods allow you to retrieve data from the result set.

    getString Method

    • Retrieves a value from the result set as a String.
    • Takes a columnLabel as an argument which can be the name of a column or a label defined using the SQL AS clause.

    getBoolean Method

    • Retrieves a value from the result set as a boolean.

    getByte Method

    • Retrieves a value from the result set as a byte.

    getShort Method

    • Retrieves a value from the result set as a short.

    getInt Method

    • Retrieves a value from the result set as an int.

    getLong Method

    • Retrieves a value from the result set as a long.

    getFloat Method

    • Retrieves a value from the result set as a float.

    getDouble Method

    • Retrieves a value from the result set as a double.

    getBigDecimal Method

    • Retrieves a value from the result set as a java.math.BigDecimal.

    getBytes Method

    • Retrieves a value from the result set as a byte[] array.

    getDate Method

    • Retrieves a value from the result set as a java.sql.Date object.

    getTime Method

    • Retrieves a value from the result set as a java.sql.Time object.

    getTimestamp Method

    • Retrieves a value from the result set as a java.sql.Timestamp object.

    getAsciiStream Method

    • Retrieves a value from the results set as a stream of ASCII characters.
    • This method is suitable for retrieving large LONGVARCHAR values.

    getUnicodeSteam Method

    • Retrieves a value from the result set as a stream of two-byte Unicode characters.
    • Use the getCharacterStream method instead.

    getBinaryStream Method

    • Retrieves a value from the result set as a stream of uninterpreted bytes.
    • This method is suitable for retrieving large LONGVARBINARY values.

    getWarnings Method

    • Retrieves the first warning reported by calls on the ResultSet object.
    • Subsequent warnings on this ResultSet object will be chained to the SQLWarning object that this method returns.
    • The warning chain is automatically cleared each time a new row is read.

    clearWarnings Method

    • Clears all warnings reported on the ResultSet object.

    getCursorName Method

    • Retrieves the name of the SQL cursor used by the ResultSet object.

    getMetaData Method

    • Retrieves the number, types, and properties of the ResultSet object's columns.

    getObject Method

    • Gets the value of a designated column in the current row of the ResultSet object as an Object.
    • This method returns the value of the given column as a Java object.

    findColumn Method

    • Maps the given ResultSet column label to the corresponding ResultSet column index.

    getCharacterStream Method

    • Retrieves the value of the designated column in the current row of the ResultSet object as a java.io.Reader object.

    isBeforeFirst Method

    • Determines if the cursor is before the first row in the ResultSet object.
    • This method is optional for ResultSets with a result set type of TYPE_FORWARD_ONLY.

    isAfterLast Method

    • Determines if the cursor is after the last row in the ResultSet object.
    • This method is optional for ResultSets with a result set type of TYPE_FORWARD_ONLY.

    isFirst Method

    • Determines if the cursor is on the first row of the ResultSet object.
    • This method is optional for ResultSets with a result set type of TYPE_FORWARD_ONLY.

    isLast Method

    • Determines if the cursor is on the last row of the ResultSet object.
    • May be expensive as the JDBC driver might need to fetch ahead one row.

    ResultSet methods

    • boolean isLast(): Determines if the cursor is positioned on the last row of the result set. It returns true if the cursor is on the last row and false otherwise. This method is optional for result sets with a type of TYPE_FORWARD_ONLY.
    • void beforeFirst(): Moves the cursor to the beginning of the result set, just before the first row. This has no effect if there are no rows in the result set.
    • void afterLast(): Moves the cursor to the end of the result set, just after the last row. This has no effect if there are no rows in the result set.
    • boolean first(): Moves the cursor to the first row of the result set. Returns true if there is a row, false otherwise.
    • boolean last(): Moves the cursor to the last row of the result set. Returns true if there is a row, false otherwise.
    • int getRow(): Returns the current row number (1-based index). Returns 0 if there is no current row. This method is optional for TYPE_FORWARD_ONLY result sets.
    • boolean absolute(int row): Moves the cursor to the specified row number. Positive values move the cursor forward, negative values move backward. A zero value moves the cursor before the first row. It returns true if the cursor is moved to a valid row, false if beyond the first or last row.
    • boolean relative(int rows): Moves the cursor relative to the current row, moving rows number of rows forward or backward. This method is identical to next() for rows = 1 and previous() for rows = -1. It returns true if the cursor is on a valid row and false otherwise.
    • boolean previous(): Moves the cursor to the previous row. Returns true if positioned on a valid row, false if before the first row.
    • void setFetchDirection(int direction): Sets the fetch direction for the result set. The possible values are: FETCH_FORWARD, FETCH_REVERSE, and FETCH_UNKNOWN.
    • int getFetchDirection(): Returns the current fetch direction of the result set.
    • void setFetchSize(int rows): Hints the JDBC driver on the number of rows to fetch when more are needed. A zero value means the driver can choose the size.
    • int getFetchSize(): Returns the current fetch size of the result set.
    • int getType(): Returns the type of the result set, which can be one of the following: TYPE_FORWARD_ONLY, TYPE_SCROLL_INSENSITIVE, or TYPE_SCROLL_SENSITIVE.
    • int getConcurrency(): Returns the concurrency mode of the result set, which is either CONCUR_READ_ONLY or CONCUR_UPDATABLE.
    • boolean rowUpdated(): Returns true if the current row has been visibly updated by the owner or another, false otherwise. This method is optional for CONCUR_READ_ONLY result sets.
    • boolean rowInserted(): Returns true if the current row is detected to have been inserted, false otherwise. This method is optional for CONCUR_READ_ONLY result sets.
    • boolean rowDeleted(): Returns true if the current row is detected to have been deleted by the owner or another, false otherwise. This method is optional for CONCUR_READ_ONLY result sets.
    • void updateNull(int columnIndex): Updates the designated column to a null value. This does not update the database itself.
    • void updateBoolean(int columnIndex, boolean x): Updates the designated column with a boolean value. This does not update the database itself.
    • void updateByte(int columnIndex, byte x): Updates the designated column with a byte value. This does not update the database itself.
    • void updateShort(int columnIndex, short x): Updates the designated column with a short value. This does not update the database itself.
    • void updateInt(int columnIndex, int x): Updates the designated column with an int value. This does not update the database itself.
    • void updateLong(int columnIndex, long x): Updates the designated column with a long value. This does not update the database itself.
    • void updateFloat(int columnIndex, float x): Updates the designated column with a float value. This does not update the database itself.
    • void updateDouble(int columnIndex, double x): Updates the designated column with a double value. This does not update the database itself.
    • void updateBigDecimal(int columnIndex, BigDecimal x): Updates the designated column with a BigDecimal value. This does not update the database itself.
    • void updateString(int columnIndex, String x): Updates the designated column with a String value. This does not update the database itself.
    • void updateBytes(int columnIndex, byte[] x): Updates the designated column with a byte[] value. This does not update the database itself.
    • void updateDate(int columnIndex, Date x): Updates the designated column with a Date value. This does not update the database itself.
    • void updateTime(int columnIndex, Time x): Updates the designated column with a Time value. This does not update the database itself.
    • void updateTimestamp(int columnIndex, Timestamp x): Updates the designated column with a Timestamp value. This does not update the database itself.
    • void updateAsciiStream(int columnIndex, InputStream x, int length): Updates the designated column with an InputStream value. This does not update the database itself.
    • void updateBinaryStream(int columnIndex, InputStream x, int length): Updates the designated column with an InputStream value. This does not update the database itself.
    • void updateCharacterStream(int columnIndex, Reader x, int length): Updates the designated column with a Reader value. This does not update the database itself.
    • void updateObject(int columnIndex, Object x, int scaleOrLength): Updates the designated column with an Object value. This does not update the database itself.
    • void updateObject(int columnIndex, Object x): Updates the designated column with an Object value. This does not update the database itself.
    • void updateRef(int columnIndex, Ref x): Updates the designated column with a Ref value. This does not update the database itself.
    • void updateBlob(int columnIndex, Blob x): Updates the designated column with a Blob value. This does not update the database itself.
    • void updateClob(int columnIndex, Clob x): Updates the designated column with a Clob value. This does not update the database itself.
    • void updateArray(int columnIndex, Array x): Updates the designated column with an Array value. This does not update the database itself.
    • void updateRow(): Updates the underlying database with the changes made to the current row using the updater methods.
    • void insertRow(): Inserts a new row into the database with the values set using the updater methods.
    • void deleteRow(): Deletes the current row from the database.
    • void refreshRow(): Refreshes the current row with the data from the database.
    • void cancelRowUpdates(): Reverts all updates made to the current row since the last call to updateRow, insertRow or refreshRow. This does not affect the values in the database.
    • void moveToInsertRow(): Moves the cursor to the insert row. This allows you to populate values for a new row to be inserted.
    • void moveToCurrentRow(): Moves the cursor back to the current row from the insert row.
    • void clearWarnings(): Clears the warning chain of this ResultSet object.
    • SQLWarning getWarnings(): Retrieves the warning chain for this ResultSet object.
    • String getCursorName(): Retrieves the cursor name specified when this ResultSet object was created.
    • void close(): Closes this ResultSet object and releases the resources held by it.

    Exceptions

    • SQLException: Thrown if a database access error occurs, or the method is called on a closed result set, or a result set type or concurrency restriction prevents the requested operation.
    • SQLFeatureNotSupportedException: Thrown if the JDBC driver does not support the requested method.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    Test your knowledge on how frames work in web pages and the role of JavaScript in their functionality. Learn what happens if JavaScript is disabled in your browser and explore the alternatives provided for non-frame versions. This quiz will challenge your understanding of these integral web technologies.

    More Like This

    Bootstrap Web Development Basics
    5 questions

    Bootstrap Web Development Basics

    StunningConstellation avatar
    StunningConstellation
    Angular Web Development Framework Overview
    10 questions

    Angular Web Development Framework Overview

    BrighterSpessartine avatar
    BrighterSpessartine
    JavaScript MV* Frameworks Overview
    24 questions

    JavaScript MV* Frameworks Overview

    FavorableJuniper avatar
    FavorableJuniper
    JavaScript Frameworks: jQuery Overview
    16 questions

    JavaScript Frameworks: jQuery Overview

    NoteworthyDwarf avatar
    NoteworthyDwarf
    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser