JDBC参数化查询示例

import com.mysql.jdbc.Driver;

import java.sql.*;

public class JDBCDemo {
    public static void main(String[] args) throws Exception {

        //1 获取连接
        String url = "jdbc:mysql://IP:Port/db_name";
        String username = "username ";
        String password = "password ";
        Connection conn = DriverManager.getConnection(url, username, password);

        //2 sql 语句
        String sql = "select * from account where name=?";
        //3 获取执行sql的对象
        PreparedStatement stmt = conn.prepareStatement(sql);
        stmt.setString(1, "青云ing");

        //4 执行sql
        ResultSet rs = stmt.executeQuery();

        while (rs.next()) {
            System.out.println("-----------------");
            System.out.println("ID:" + rs.getInt("id") + " Name:" + rs.getString("name") + " Age:" + rs.getInt("age"));
        }

        //6 释放资源
        stmt.close();
        conn.close();
    }
}