一天搞定JDBC01：连接数据库并执行sql语句

package JDBCTest;

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

public class JDBCDemo {
    
    public static void main(String[] args) 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
        //PreparedStatement prepareStatement(sql) 预编译sql的执行对象,防止sql注入

        //5. 执行存储过程的对象 CallableStatement prepareCall(sql)

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

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

        //7.释放资源
        stmt.close();
        conn.close();


    }
}