What should be taken into consideration when using JDBC?

When using JDBC, there are several important points to keep in mind: 1. Import JDBC driver: Before using JDBC, you need to import the appropriate JDBC driver. You can import the driver by adding the driver’s JAR file to the project’s classpath. 2. Establish database connection: Use the `DriverManager.getConnection()` method to establish a connection with the database. You need to provide connection information such as the database URL, username, and password. 3. Handle exceptions: When using JDBC, there may be exceptions such as database connection failure or SQL statement execution errors. You need to use try-catch statements to catch and handle these exceptions. 4. Execute SQL statements: Use the `createStatement()` method of the `Connection` object to create a `Statement` object, and then use the `executeQuery()` or `executeUpdate()` methods of the `Statement` object to execute the corresponding SQL statements. 5. Handle result set: If you are executing a query statement, you can use the `ResultSet` object to retrieve the query results. You can use the `next()` method of the `ResultSet` object to iterate through the result set, and use the `getXXX()` series of methods to retrieve specific data. 6. Close resources: After using JDBC-related objects, you need to explicitly close these resources to release system resources. You can use the `close()` method to close objects such as `Connection`, `Statement`, and `ResultSet`. 7. Use prepared statements: To improve the efficiency and security of executing SQL statements, you can use prepared statements to execute SQL statements. Prepared statements can be created using the `prepareStatement()` method of the `Connection` object, and parameter values can be set using the `setXXX()` method. 8. Transaction processing: If you need to maintain atomicity and consistency across multiple SQL statements, you can use transaction processing. You can use the `setAutoCommit(false)` method of the `Connection` object to disable auto-commit mode, and use the `commit()` and `rollback()` methods to commit or roll back transactions. 9. Connection pool: To improve the performance and reliability of database connections, you can use a connection pool to manage database connections. The connection pool can create a certain number of database connections in advance, allocate them to the application when needed, and return them to the connection pool after use. 10. Prevent SQL injection: When concatenating SQL statements, it is important to prevent SQL injection attacks. You can prevent SQL injection by using prepared statements or parameterized queries.