JDBC连接mysql编程

基本操作

package jdbc;import java.sql.Statement;
import java.util.Scanner;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;public class test {public static void main(String[] args) throws Exception {String url = "jdbc:mysql://localhost:3306/usedb" ;  //下面几行都是模板    String user = "root" ;   String password = "" ;Class.forName("com.mysql.jdbc.Driver");Connection conn=DriverManager.getConnection(url, user, password);Statement stmt=conn.createStatement(); String sql="select * from myuser";   //sql语句ResultSet re=stmt.executeQuery(sql); //传入sql语句获得结果集while(re.next()){  //next函数System.out.println(re.getString("name")); //得到特定字段对应的值String s1=re.getString(1); //得到第几个字段对应的值，不一定是String 类型String s2=re.getString(2);System.out.println(s1+"  "+s2);}sql="insert into myuser values('4','lihua','122222')"; //修改语句int i=stmt.executeUpdate(sql);//可实现添加删除修改,返回int值，代表影响几条记录if(i==1) System.out.println("添加成功");else System.out.println("添加失败");re.close();    stmt.close();   conn.close();}}

PreparedStatement

Connection conn=DriverManager.getConnection(url, user, password);PreparedStatement ps=null;   ps=conn.prepareStatement("select name from myuser where id=?"); //这种方式更佳ps.setString(1, "1");  //设置第几个问号为什么ResultSet re=ps.executeQuery();  //执行sql语句while(re.next()){  //next函数String s=re.getString(1);System.out.println(s); //得到特定字段对应的值}