How can I modify a database query using JDBC?

In order to modify database statements, the first step is to connect to the database. The following are the general steps to modify database statements using JDBC.

1. Establishing a database connection: Use the Connection object to connect to the database. You can use the DriverManager.getConnection() method to obtain the database connection.

Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb", "username", "password");

2. Creating a Statement object: Use a Statement object to execute SQL statements. You can create a Statement object using the createStatement() method.

Statement statement = connection.createStatement();

3. Run SQL statement: Use the executeUpdate() method to carry out SQL statements that modify the database, such as INSERT, UPDATE, DELETE, and so on.

String sql = "UPDATE table_name SET column1 = value1 WHERE column2 = value2";
int rowsAffected = statement.executeUpdate(sql);

Result Processing: The results obtained from executing SQL statements can be processed as needed, such as obtaining the number of affected rows.

5. Close Connection: After finishing the database operation, remember to close the database connection and Statement object to release resources.

statement.close();
connection.close();

The above outlines the general steps for modifying database statements through JDBC. Depending on specific needs and circumstances, the corresponding code can be adjusted and modified flexibly.