一天学会JDBC03：Statement的用法

package JDBCTest;

import org.junit.Test;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;

public class JDBCDemo4_Statement {
    
    @Test public void testDml() throws Exception{
    
            //1.注册驱动
            Class.forName("com.mysql.jdbc.Driver");

            //2.获取连接
            String url="jdbc:mysql://127.0.0.1:3306/test?useSSL=false";
            String username="root";
            String password="lyt2529165097";
            Connection conn = DriverManager.getConnection(url, username, password);

            //3.定义一个sql语句
            String sql="UPDATE emp set age =age+10 WHERE age>20";

            //4.获取执行sql的对象 statement
            Statement stmt = conn.createStatement();//获取执行sql的对象

            //5.执行sql
            int count = stmt.executeUpdate(sql);

            //6.处理结果
            System.out.println(count);

            if (count>0){
    
                System.out.println("修改数据成功");
            }else{
    
                System.out.println("修改数据失败");
            }
            //7.释放资源
            stmt.close();
            conn.close();

    }
}