SSM学习06Mybatis的插入 更新 删除

本次的环境与上次相同不再过多讲述，实验目录：

本次的insert update delete都是需要在CustomerMapper.xml中继续配置xml标签就可以完成

CustomerMapper.xml：

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 3     "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 4 <mapper namespace="com.zyk.mapper.CustomerMapper">
 5 <select id="findCustomerById" parameterType="Int" resultType="com.zyk.po.Customer">
 6 select * from t_customer where id = #{id}
 7 </select>
 8 <select id="findCustomerByName" parameterType="String" resultType="com.zyk.po.Customer">
 9     select * from t_customer where username like concat('%',#{value},'%');
10 </select>
11 <insert id="addCustomer" parameterType="com.zyk.po.Customer">
12 insert into t_customer(username,jobs,phone)
13 values(#{username},#{jobs},#{phone})
14 </insert>
15 <delete id="deleteCustomer" parameterType="int">
16     delete from t_customer where id=#{id}
17 </delete>
18 <update id="updateCustomer" parameterType="com.zyk.po.Customer">
19 update t_customer set 
20 username=#{username},jobs=#{jobs},phone=#{phone}
21 where id=#{id}
22 </update>
23 </mapper>

测试所用的代码

MybatisAddTest：

 1 package com.zyk.Test;
 2 
 3 import java.io.IOException;
 4 import java.io.InputStream;
 5 
 6 import org.apache.ibatis.io.Resources;
 7 import org.apache.ibatis.session.SqlSession;
 8 import org.apache.ibatis.session.SqlSessionFactory;
 9 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
10 import org.junit.Test;
11 
12 import com.zyk.po.Customer;
13 
14 public class MybatisAddTest {
15     @Test
16     public void test() throws IOException {
17         String resource="config.xml";
18         InputStream inputStream=Resources.getResourceAsStream(resource);
19         SqlSessionFactory sessionFactory=new SqlSessionFactoryBuilder().build(inputStream);
20         SqlSession sqlSession=sessionFactory.openSession();
21         Customer customer=new Customer();
22         customer.setUsername("zhangyunkun");
23         customer.setJobs("student");
24         customer.setPhone("13734115929");
25         int num=sqlSession.insert("com.zyk.mapper"+".CustomerMapper.addCustomer",customer);
26         if(num>0) {
27             System.out.println("success"+num);
28         }else {
29             System.out.println("fail");
30         }
31         sqlSession.commit();
32         sqlSession.close();
33     }
34 }

MybatisDeleteTest：

 1 package com.zyk.Test;
 2 
 3 import java.io.IOException;
 4 import java.io.InputStream;
 5 
 6 import org.apache.ibatis.io.Resources;
 7 import org.apache.ibatis.session.SqlSession;
 8 import org.apache.ibatis.session.SqlSessionFactory;
 9 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
10 import org.junit.Test;
11 
12 public class MybatisDeleteTest {
13     @Test
14     public void test() throws IOException {
15         String resource="config.xml";
16         InputStream inputStream=Resources.getResourceAsStream(resource);
17         SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(inputStream);
18         SqlSession sqlSession=sqlSessionFactory.openSession();
19         int num=sqlSession.delete("com.zyk.mapper"+".CustomerMapper.deleteCustomer", 3);
20         if(num>0) {
21             System.out.println("success");
22         }else {
23             System.out.println("fail");
24         }
25         sqlSession.commit();
26         sqlSession.close();
27     }
28     
29     
30 }

MybatisUpdateTest：

package com.zyk.Test;

import java.io.IOException;
import java.io.InputStream;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;

import com.zyk.po.Customer;

public class MybatisUpdateTest {
    @Test
    public void tesrt() throws IOException {
        String resource="config.xml";
        InputStream inputStream=Resources.getResourceAsStream(resource);
        SqlSessionFactory sessionFactory=new SqlSessionFactoryBuilder().build(inputStream);
        SqlSession sqlSession=sessionFactory.openSession();
        Customer customer=new Customer();
        customer.setId(3);
        customer.setUsername("zjh");
        customer.setJobs("student");
        customer.setPhone("15614141855");
        int num=sqlSession.update("com.zyk.mapper"+".CustomerMapper.updateCustomer", customer);
        if (num>0) {
            System.out.println("success");
        }else {
            System.out.println("fail");
        }
        sqlSession.commit();
        sqlSession.close();
    }
}

实验截图，由于直接执行完成只有最后的表：

实验问题：

前面执行代码输出success之后，数据库没有任何的变化，原因在于最后没有写sqlsession.commit（）提交这一句导致有success，数据没有写到数据库中。

mybatis操作实验总结：
1.读取配置文件

String resource="config.xml";
InputStream inputStream=Resources.getResourceAsStream(resource);

2.根据配置文件创建SqlSessionFactory

SqlSessionFactory sessionFactory=new SqlSessionFactoryBuilder().build(inputStream);

3.通过SqlSessionFactory创建SqlSession

 SqlSession sqlSession=sessionFactory.openSession();

4.使用SqlSession对象进行对数据库的操作

 Customer customer=new Customer();
        customer.setId(3);
        customer.setUsername("zjh");
        customer.setJobs("student");
        customer.setPhone("15614141855"); int num=sqlSession.update("com.zyk.mapper"+".CustomerMapper.updateCustomer", customer); if (num>0) { System.out.println("success"); }else { System.out.println("fail"); } sqlSession.commit();

5.关闭SqlSession

sqlSession.close();