.NET Framework Data Providers Quiz
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Questions and Answers

What is a primary function of a database application?

  • Connecting to a data source (correct)
  • Displaying data in a user interface
  • Compiling code for performance
  • Managing user permissions

    • Which object is used to connect to a specific data source in ADO.NET?

  • DataReader object
  • Command object
  • Connection object (correct)
  • DataAdapter object

    • What method of the Connection object is used to close the database connection?

  • Disconnect
  • Close (correct)
  • End
  • Terminate

    • Which of the following is NOT a property of the Connection object in ADO.NET?

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

    What is the purpose of the Command object in ADO.NET?

    <p>To execute commands to a database</p> Signup and view all the answers

    Which connection object is used for SQL Server in ADO.NET?

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

    Which step is NOT involved when establishing a database connection using ADO.NET?

    <p>Start the server</p> Signup and view all the answers

    Which property of the Connection object gets the current state of the connection?

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

    What does the CommandText property of a Command object represent?

    <p>The SQL statement or stored procedure to execute</p> Signup and view all the answers

    Which method is used to execute a non-row returning SQL statement?

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

    What is the primary purpose of the SqlDataAdapter in ADO.NET?

    <p>To bridge between a DataSet and SQL Server for data retrieval and saving</p> Signup and view all the answers

    How can the Command object be initialized using a connection object?

    <p>By assigning theSqlConnection to cmd.Connection and setting cmd.CommandText</p> Signup and view all the answers

    What does the ExecuteScalar method return?

    <p>The value in the first column of the first row of the result</p> Signup and view all the answers

    What happens during the Fill method of the SqlDataAdapter?

    <p>It retrieves data from the data source into the DataSet</p> Signup and view all the answers

    What is the default CommandType set for CommandText when executing SQL in ADO.NET?

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

    What occurs when the Update method of the SqlDataAdapter is called?

    <p>It saves changes from the DataSet back to the data source</p> Signup and view all the answers

    Which namespace is used to access Microsoft SQL Server through ADO.NET?

    <p>System.Data.SqlClient</p> Signup and view all the answers

    What is the primary role of the DataAdapter in ADO.NET?

    <p>To transfer data between DataSource and DataSet</p> Signup and view all the answers

    Which object is used to establish a connection to a Microsoft SQL Server data source?

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

    What action does the Command object perform in ADO.NET?

    <p>Fires SQL commands and actions on the data source</p> Signup and view all the answers

    Which namespace is utilized for data sources accessed through OLEDB?

    <p>System.Data.OleDb</p> Signup and view all the answers

    What type of access does the DataReader provide in ADO.NET?

    <p>Read-only and forward-only access</p> Signup and view all the answers

    In which scenario would you use the Server Explorer in Visual Studio?

    <p>To connect to and manage databases</p> Signup and view all the answers

    What is the function of the Connection class in ADO.NET?

    <p>To establish a connection to the data source</p> Signup and view all the answers

    What does the SqlDataAdapter do when it fills a DataSet?

    <p>It creates necessary tables and columns if they do not exist.</p> Signup and view all the answers

    Which properties of SqlDataAdapter facilitate loading and updating data?

    <p>SelectCommand, InsertCommand, DeleteCommand, UpdateCommand</p> Signup and view all the answers

    What must be done for every column propagated to the data source on Update?

    <p>A parameter should be added to InsertCommand, UpdateCommand, or DeleteCommand.</p> Signup and view all the answers

    Which of the following correctly describes the UpdateCommand property?

    <p>It updates records in the data source.</p> Signup and view all the answers

    What is the purpose of the SourceColumn property in the DbParameter object?

    <p>To specify the value comes from the particular column in the row being processed.</p> Signup and view all the answers

    When changes are made to a row, which command template is executed based on the type of change?

    <p>Either Insert, Update, or Delete command templates are executed as needed.</p> Signup and view all the answers

    What do the InsertCommand, UpdateCommand, and DeleteCommand have in common?

    <p>They are templates filled with values from modified rows through parameters.</p> Signup and view all the answers

    What is required for an instance of SqlDataAdapter upon creation?

    <p>The read/write properties are set to initial values.</p> Signup and view all the answers

    What method is used to send SQL INSERT statements to a database?

    <p>SqlCommand object and its ExecuteNonQuery method</p> Signup and view all the answers

    Which method would be used to execute SQL UPDATE statements in ADO.NET?

    <p>SqlCommand object and its ExecuteNonQuery method</p> Signup and view all the answers

    How are SQL DELETE statements executed in ADO.NET?

    <p>Using SqlCommand object and its ExecuteNonQuery method</p> Signup and view all the answers

    Which of the following is the correct method to invoke stored procedures?

    <p>SqlCommand object and its ExecuteNonQuery method</p> Signup and view all the answers

    When retrieving a single value from a returned row, which method is used?

    <p>SqlCommand object and its ExecuteScalar method</p> Signup and view all the answers

    What is the purpose of the Command object in ADO.NET?

    <p>To send SQL commands to the database</p> Signup and view all the answers

    What differentiates a DataSet from a DataReader in ADO.NET?

    <p>DataReaders are connected and forward-only, while DataSets are disconnected.</p> Signup and view all the answers

    What is the typical use of the Connection object in ADO.NET?

    <p>To establish a connection with the database</p> Signup and view all the answers

    Study Notes

    Database Applications: Core Function

    • Managing and organizing data efficiently.

    ADO.NET: Establishing Connections

    • The Connection object in ADO.NET is used to connect to a specific data source.

    • The Close() method of the Connection object is used to terminate the database connection.

    • State is NOT a property of the Connection object.

    ADO.NET: Command Object

    • The Command object executes SQL statements.

    • The SqlConnection object is used to connect to a SQL Server database.

    • The Open() method initiates a connection to the database.

    • The ConnectionState property reflects the current state of the database connection.

    • The CommandText property defines the SQL statement or stored procedure to be executed.

    • The ExecuteNonQuery() method is employed for SQL statements that don't return rows.

    ADO.NET: SqlDataAdapter

    • The SqlDataAdapter facilitates data transfer between a database and a DataSet.

    • A Connection object can be used to initialize the Command object.

    • The ExecuteScalar() method retrieves a single value from a database query.

    • The Fill() method of the SqlDataAdapter populates a DataSet with data from a database.

    • The default CommandType for CommandText is set to Text, meaning it expects an SQL statement.

    • The Update() method of the SqlDataAdapter synchronizes changes made to a DataSet with the associated database.

    ADO.NET: Namespaces and SQL Server Access

    • The System.Data.SqlClient namespace is used to access a Microsoft SQL Server database.

    ADO.NET: DataAdapter

    • The DataAdapter acts as a bridge between data sources and datasets, enabling data flow and synchronization.

    • The SqlConnection object is used to establish a connection to a Microsoft SQL Server data source.

    • The Command object executes the SQL statements sent to a database.

    • System.Data.OleDb namespace is used for data sources accessible through OLEDB.

    • The DataReader provides forward-only, read-only access to data.

    ADO.NET: Visual Studio Server Explorer

    • The Server Explorer in Visual Studio is used to explore and manage databases, connections, and other data resources.

    ADO.NET: Connection and Dataset

    • The Connection class provides a mechanism for establishing and managing database connections.

    • When the Fill() method executes, changes from the dataset are synchronized with the data source.

    ADO.NET: DataAdapter Properties

    • The InsertCommand, UpdateCommand, and DeleteCommand properties of the SqlDataAdapter control the functionality of inserting, updating, and deleting data.

    • For every column modified in the data source during an update, a corresponding parameter must be defined.

    • The UpdateCommand property specifies the command used to update data in a database.

    • The SourceColumn property in the DbParameter object identifies the source column from which the parameter value is obtained.

    • Changes made to a row trigger the execution of an appropriate command template (InsertCommand, UpdateCommand, or DeleteCommand) based on the type of change.

    • The InsertCommand, UpdateCommand, and DeleteCommand properties share the common goal of managing database modifications.

    ADO.NET: SqlDataAdapter Creation

    • When a SqlDataAdapter is initially created, a Connection object is required to specify the database connection.

    ADO.NET: Insert, Update, and Delete Operations

    • The InsertCommand method is used to execute SQL INSERT statements.

    • The UpdateCommand method is used to execute SQL UPDATE statements.

    • The DeleteCommand method is used to execute SQL DELETE statements.

    ADO.NET: Stored Procedures

    • ExecuteStoredProcedure() is the appropriate method to execute stored procedures.

    ADO.NET: Single Value Retrieval

    • The ExecuteScalar() method retrieves a single value from a returned row.

    ADO.NET: Command, DataSet, and DataReader

    • The Command object executes SQL statements.

    • DataSets are in-memory representations of data, often used for offline or disconnected scenarios.

    • DataReaders provide a lightweight, forward-only access to data, optimized for read-only operations.

    • The Connection object manages database connections, providing a conduit for data access.

    • The Connection object is typically used to open and close database connections, controlling the lifespan of the link between the application and the database.

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    Related Documents

    US05CCSC03 Unit 4: Database Programming with ADO.NET (PDF)

    Description

    Test your knowledge about the various data providers in the .NET Framework. This quiz covers SQL Server, OLEDB, ODBC, and Oracle data providers, including their classes and functionalities. Discover how to connect, execute commands, and retrieve data using these data providers.

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