将参数动态设置为JDBC中准备好的Statement

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

Class.forName("com.mysql.jdbc.Driver");

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

String sql = "SELECT * FROM mytable WHERE id = ?";

PreparedStatement pstmt = conn.prepareStatement(sql);

pstmt.setInt(1, 1); // 将第一个参数设置为1

ResultSet rs = pstmt.executeQuery();

while (rs.next()) {
    // 处理结果集
}

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

public class JDBCExample {
    public static void main(String[] args) {
        try {
            // 加载JDBC驱动程序
            Class.forName("com.mysql.jdbc.Driver");

            // 建立数据库连接
            Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydatabase", "username", "password");

            // 准备SQL语句
            String sql = "SELECT * FROM mytable WHERE id = ?";

            // 创建PreparedStatement对象
            PreparedStatement pstmt = conn.prepareStatement(sql);

            // 设置参数
            pstmt.setInt(1, 1);

            // 执行查询
            ResultSet rs = pstmt.executeQuery();

            // 处理结果集
            while (rs.next()) {
                // 处理结果集
            }

            // 关闭资源
            rs.close();
            pstmt.close();
            conn.close();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}