jdbc建立java和sql的连接
一.导包
1.首先新建一个项目
2.再新建一个包lib
3.把下好的sql包粘贴到lib里
4.右键lib包点击add as library
结束
二.注册驱动：
DriverManager.registerDriver(new Driver());
三.建立与数据库的连接：
String url="jdbc:mysql://127.0.0.1：sql端口号/schooldb?serverTimezone=Asia/Shanghai";String user="root"; //账户String password="root"; //密码Connection connection=DriverManager.getConnection(url,user,password);
四.发送sql
Statement statement=connection.createStatement();statement.executeUpdate("insert into major(name)value('数学')");
五.关闭与数据库的连接：
statement.close();
connection.close();
插入方法eg：
public static void main(String[] args) throws SQLException {SqlOperate.insert("lzy","男","1979-4-21","13152113467",1.88);}public static void insert(String name,String gender, String birthday,String phone,double height) throws SQLException {//注册驱动DriverManager.registerDriver(new Driver());String url="jdbc:mysql://127.0.0.1:3306/schooldb?serverTimezone=Asia/Shanghai";String user="root";String password="root";//建立与数据库的连接Connection connection=DriverManager.getConnection(url,user,password);//发送sqlStatement statement=connection.createStatement();statement.executeUpdate("update student set name='"+name+"',gender='"+gender+"',birthday='"+birthday+"',phone='"+phone+"',height="+height+"");//关闭与数据库的连接statement.close();connection.close();}
PreparedStatement实现发送sql
PreparedStatement ps=connection.prepareStatement("insert into major(name)value(?)"); //？是占位符，表示要插入一个参数ps.setObject(1,"智能"); //1表示在第一个?位置插入数据ps.executeUpdate();
PreparedStatement ps=connection.prepareStatement("update student set name=?,gender=?,birthday=?,phone=?,height=? where number=?");ps.setObject(1,name);ps.setObject(2,gender);ps.setObject(3,birthday);ps.setObject(4,phone);ps.setObject(5,height);ps.setObject(6,number);ps.executeUpdate();
)
