1.创建school_java数据库
CREATE DATABASE schooljava;
USE schooljava;
CREATE TABLE student (
id INT(11),
name VARCHAR(25),
tel INT(11),
sex VARCHAR(6)
);
DESC student;
java代码
package Mysql;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.mysql.cj.jdbc.Driver;
public class schooljava {
Connection connection;
public static void main(String[] args) throws SQLException {
schooljava schooljava=new schooljava();
schooljava.getConnection();
schooljava.selectAll();
schooljava.add(11,"一号",1824567890,"男");
schooljava.add(12,"二号",1394567890,"女");
schooljava.add(13,"三号",1893154635,"男");
schooljava.select182();
schooljava.xiugai();
schooljava.chanan();
schooljava.dsg();
schooljava.select139();
schooljava.sc();
schooljava.chanv();
schooljava.selectAll();
}
public void add(int id, String name,int tel,String sex) throws SQLException {
PreparedStatement preparedStatement=connection.prepareStatement("insert into student values(?,?,?,?);");
preparedStatement.setInt(1, id);
preparedStatement.setString(2, name);
preparedStatement.setInt(3,tel);
preparedStatement.setString(4,sex);
preparedStatement.executeUpdate();
}
public void getConnection()throws SQLException {
DriverManager.registerDriver(new Driver());//第一步：注册驱动
connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/school","root","1234");//第二步：获取连接
}
public void selectAll() throws SQLException { //查询课程表所有数据
PreparedStatement preparedStatement=connection.prepareStatement("select*from student");//第三步：获取statement对象
ResultSet resultSet=preparedStatement.executeQuery();//第四步：执行SQL语句返回结果集
while(resultSet.next()){
System.out.print(resultSet.getInt("id"));
System.out.print(resultSet.getString("name"));
System.out.print(resultSet.getInt("tel"));
System.out.println(resultSet.getString("sex"));//第五步：遍历结果集
}resultSet.close();
preparedStatement.close();}
public void select182() throws SQLException {
PreparedStatement preparedStatement=connection.prepareStatement("select*from student where tel like '182%'");
ResultSet resultSet=preparedStatement.executeQuery();
while(resultSet.next()){
System.out.print(resultSet.getInt("id"));
System.out.print(resultSet.getString("name"));
System.out.print(resultSet.getInt("tel"));
System.out.println(resultSet.getString("sex"));}
}
public void xiugai() throws SQLException {
PreparedStatement preparedStatement=connection.prepareStatement("update student set tel=1312423530 where id=5");
preparedStatement.executeUpdate( );
}
public void chanan() throws SQLException {
PreparedStatement preparedStatement=connection.prepareStatement("select*from student where sex='男'");
ResultSet resultSet=preparedStatement.executeQuery();
while(resultSet.next()){
System.out.print(resultSet.getInt("id"));
System.out.print(resultSet.getString("name"));
System.out.print(resultSet.getInt("tel"));
System.out.println(resultSet.getString("sex"));}
}
public void dsg() throws SQLException {
PreparedStatement preparedStatement=connection.prepareStatement("update student set name='大帅哥' where id=10");
preparedStatement.executeUpdate( );
}
public void select139() throws SQLException {
PreparedStatement preparedStatement=connection.prepareStatement("select*from student where tel like '139%'");
ResultSet resultSet=preparedStatement.executeQuery();
while(resultSet.next()){
System.out.print(resultSet.getInt("id"));
System.out.print(resultSet.getString("name"));
System.out.print(resultSet.getInt("tel"));
System.out.println(resultSet.getString("sex"));}
}
public void sc() throws SQLException {
PreparedStatement preparedStatement=connection.prepareStatement("delete from student where id=3");
preparedStatement.executeUpdate( );
}
public void chanv() throws SQLException {
PreparedStatement preparedStatement=connection.prepareStatement("select*from student where sex='女'");
ResultSet resultSet=preparedStatement.executeQuery();
while(resultSet.next()){
System.out.print(resultSet.getInt("id"));
System.out.print(resultSet.getString("name"));
System.out.print(resultSet.getInt("tel"));
System.out.println(resultSet.getString("sex"));}}
}
结果
查询student表中所有学生信息
student表中新增三条数据
3.查询student表中电话以182开头的所有学生信息（SQL要用到模糊查询like）
4.修改student表中第5条数据，电话改为“13124235300”
5.查询student表中所有男性的学生信息
6.修改student表中第10条数据，姓名改为“大帅哥”
7.查询student表中电话以139开头的所有学生信息（SQL要用到模糊查询like）
8.删除student表中第3条数据
9.查询student表中所有女性的学生信息
10.查询student表中所有学生信息
