java写mysql更新语句

UPDATE table_name SET column1=value1, column2=value2, ... WHERE condition;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class UpdateExample {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String user = "username";
        String password = "password";

        try (Connection conn = DriverManager.getConnection(url, user, password)) {
            String sql = "UPDATE users SET email = ? WHERE id = ?";
            try (PreparedStatement pstmt = conn.prepareStatement(sql)) {
                pstmt.setString(1, "newemail@example.com");
                pstmt.setInt(2, 1);
                int rowsUpdated = pstmt.executeUpdate();
                System.out.println("Rows updated: " + rowsUpdated);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

conn.setAutoCommit(false); // 关闭自动提交
// 执行更新操作
conn.commit(); // 提交事务

String sql = "UPDATE users SET email = ? WHERE id = ?";
try (PreparedStatement pstmt = conn.prepareStatement(sql)) {
    pstmt.setString(1, "newemail@example.com");
    pstmt.setInt(2, 1);
    pstmt.executeUpdate();
}