Podcast
Questions and Answers
What is the purpose of JDBC in Java?
What is the purpose of JDBC in Java?
- To sort arrays in Java
- To connect a Java program to a database and perform operations on the data (correct)
- To create graphical user interfaces
- To generate random numbers in Java programs
Which statement accurately describes the components of JDBC?
Which statement accurately describes the components of JDBC?
- Memory, CPU, storage
- Connection, statement, resultset (correct)
- Input, output, processing
- Frontend, backend, middleware
In which packages are JDBC classes defined?
In which packages are JDBC classes defined?
- java.util and java.io
- java.sql and javax.swing (correct)
- java.text and javax.security
- java.net and java.awt
What is the correct sequence to create a database connection using JDBC?
What is the correct sequence to create a database connection using JDBC?
Which method is used to perform DML statements in JDBC?
Which method is used to perform DML statements in JDBC?
How many transaction isolation levels are provided by the JDBC through the Connection interface?
How many transaction isolation levels are provided by the JDBC through the Connection interface?
Which method in JDBC API is static and synchronized?
Which method in JDBC API is static and synchronized?
What methods are required to load a database driver in JDBC?
What methods are required to load a database driver in JDBC?
Parameterized queries can be executed by?
Parameterized queries can be executed by?
What does setAutoCommit(false) do in JDBC?
What does setAutoCommit(false) do in JDBC?
Study Notes
JDBC Overview
- JDBC (Java Database Connectivity) allows Java programs to interact with a wide range of databases and perform various database operations.
JDBC Components
- JDBC architecture consists of two components: JDBC API (Application Programming Interface) and JDBC Driver.
JDBC Packages
- JDBC classes are defined in two packages: java.sql and javax.sql.
Database Connection Sequence
- To create a database connection using JDBC, the correct sequence is:
- Load the JDBC driver
- Establish a connection with the database
- Create a Statement object
- Execute a query using the Statement object
- Process the results
- Close the resources
DML Statements
- The executeUpdate() method is used to perform DML (Data Manipulation Language) statements in JDBC.
Transaction Isolation Levels
- JDBC provides five transaction isolation levels through the Connection interface: READ_UNCOMMITTED, READ_COMMITTED, REPEATABLE_READ, SERIALIZABLE, and NONE.
Static and Synchronized Method
- The DriverManager class has a static and synchronized method called registerDriver().
Loading a Database Driver
- To load a database driver in JDBC, the following methods are required:
- Call Class.forName() to load the driver class
- Call DriverManager.getConnected() to establish a connection with the database
Parameterized Queries
- PreparedStatements can execute parameterized queries.
Commit and Rollback
- setAutoCommit(false) disables the auto-commit mode, allowing multiple statements to be executed together as a single transaction.
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Description
Test your knowledge of Java Database Connectivity (JDBC) with this set of multiple-choice questions. Whether you are preparing for a Java interview or a competitive exam, these questions will help you assess your understanding of JDBC concepts and operations.
