发表于: 2019-12-20 18:06:57

1 1243


今天完成的事情: 

1.完成了spring+mybatis的整合

1)项目目录如下

2)User.java(实体类)

package com.wp.sm.beans;

public class User {
private int id;
   private String name;
   private String pwd;
   public  User(){};
   public  User(String name,String pwd){
this.name=name;
       this.pwd=pwd;
   }
public  User(String name,String pwd,int id){
this.name=name;
       this.pwd=pwd;
       this.id=id;
   }

public int getId() {
return id;
   }

public void setId(int id) {
this.id = id;
   }

public String getName() {
return name;
   }

public void setName(String name) {
this.name = name;
   }

public String getPwd() {
return pwd;
   }

public void setPwd(String pwd) {
this.pwd = pwd;
   }

@Override
   public String toString() {
return "User [id=" + id + ", name=" + name + ", pwd=" + pwd + "]";
   }
}

3)UserMapper.java(接口)

package com.wp.sm.mapper;

import com.wp.sm.beans.User;

import java.util.List;

public interface UserMapper {

public int insertUser(User user) throws Exception;

   public int updateUser(User user) throws Exception;

   public int deleteUser(int id) throws Exception;

   public User selectUserById(int id) throws Exception;

   public List<User> selectAllUser() throws Exception;
}

4)UserMapperImpl.java(接口实现类)

package com.wp.sm.impl;

import com.wp.sm.beans.User;
import com.wp.sm.mapper.UserMapper;
import org.apache.ibatis.session.SqlSession;
import org.mybatis.spring.support.SqlSessionDaoSupport;

import java.util.List;

public class UserMapperImpl extends SqlSessionDaoSupport implements UserMapper {

@Override
   public int insertUser(User user) throws Exception {
SqlSession sqlSession = this.getSqlSession();
       int insert = sqlSession.insert("test.insertUser", user);
       return insert;
   }

@Override
   public int updateUser(User user) throws Exception {
SqlSession sqlSession = this.getSqlSession();
       int update = sqlSession.update("test.updateUser", user);
       return update;
   }

@Override
   public int deleteUser(int id) throws Exception {
SqlSession sqlSession = this.getSqlSession();
       int del = sqlSession.delete("test.deleteUser", id);
       return del;
   }

@Override
   public User selectUserById(int id) throws Exception {
SqlSession sqlSession = this.getSqlSession();
       User user = sqlSession.selectOne("test.selectUserById", id);
       return user;
   }

@Override
   public List<User> selectAllUser() throws Exception {
SqlSession sqlSession = this.getSqlSession();
       List<User> user = sqlSession.selectList("test.selectAllUser");
       return user;
   }
}

5)UserMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org/DTD Mapper 3.0" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="test">
   <insert id="insertUser" parameterType="com.wp.sm.beans.User">
       insert into user (name, pwd)
values (#{name}, #{pwd})
</insert>

   <update id="updateUser" parameterType="com.wp.sm.beans.User">
       update user
set name=#{name},
pwd=#{pwd}
where id = #{id}
</update>

   <delete id="deleteUser" parameterType="int">
       delete
from user
where id = #{id}
</delete>

   <select id="selectUserById" parameterType="int" resultType="com.wp.sm.beans.User">
       select *
       from user
where id = #{id}
</select>

   <select id="selectAllUser" parameterType="com.wp.sm.beans.User" resultType="com.wp.sm.beans.User">
       select *
       from user
</select>
</mapper>

6)UserServiceTest.java(测试类)

package com.wp.sm.service;

import com.wp.sm.beans.User;
import com.wp.sm.mapper.UserMapper;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.util.List;

public class UserServiceTest {
private ApplicationContext applicationContext;

   // 在执行测试方法之前首先获取 Spring 配置文件对象
   // 注解@Before在执行本类所有测试方法之前先调用这个方法
   @Before
   public void setup() throws Exception {
applicationContext = new
               ClassPathXmlApplicationContext("classpath:applicationContext.xml");
   }

@Test
   public void selectUserById() throws Exception {
// 通过配置资源对象获取 userMapper 对象
       UserMapper userMapper = (UserMapper) applicationContext.getBean("UserMapper");
       // 调用 UserMapper 的方法
       User user = userMapper.selectUserById(1);
       // 输出用户信息
       System.out.println(user.toString());
   }

@Test
   public void selectAllUser() throws Exception {
// 通过配置资源对象获取 userMapper 对象
       UserMapper userMapper = (UserMapper) applicationContext.getBean("UserMapper");
       // 调用 UserMapper 的方法
       List<User> user = userMapper.selectAllUser();
       // 输出用户信息
       System.out.println(user.toString());
   }

@Test
   public void deleteUser() throws Exception {
// 通过配置资源对象获取 userMapper 对象
       UserMapper userMapper = (UserMapper) applicationContext.getBean("UserMapper");
       userMapper.deleteUser(10);
   }
@Test
   public void updateUser() throws Exception {
// 通过配置资源对象获取 userMapper 对象
       UserMapper userMapper = (UserMapper) applicationContext.getBean("UserMapper");
       User user=new User();
       user.setName("万万");
       user.setPwd("111111");
       user.setId(3);
       userMapper.updateUser(user);
   }
@Test
   public void insertUser() throws Exception {
// 通过配置资源对象获取 userMapper 对象
       UserMapper userMapper = (UserMapper) applicationContext.getBean("UserMapper");
       User user=new User();
       user.setName("peter");
       user.setPwd("111111");
       userMapper.insertUser(user);
   }
}

7)applicationContext.xml(spring的配置文件)

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xmlns:context="http://www.springframework.org/schema/context"
      xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
   <!-- 加载配置文件 -->
   <context:property-placeholder location="classpath:db.properties"/>

   <!-- 配置数据源 -->
   <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
       <property name="driverClass" value="${driver}"/>
       <property name="jdbcUrl" value="${url}"/>
       <property name="user" value="${username}"/>
       <property name="password" value="${password}"/>
   </bean>

   <!-- sqlSessionFactory -->
   <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
       <!-- 加载 MyBatis 的配置文件 -->
       <property name="configLocation" value="mybatis.xml"/>
       <!-- 数据源 -->
       <property name="dataSource" ref="dataSource"/>
   </bean>
   <bean id="UserMapper" class="com.wp.sm.impl.UserMapperImpl">
       <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
   </bean>
</beans>

8)mybatis.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
       PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
       "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
   <!--mybatis.xml里注册UserMapper.xml文件-->
   <mappers>
       <mapper resource="com/wp/sm/mapper/UserMapper.xml"/>
   </mappers>
</configuration>

9)db.properties

username=root
password=19980710
url=jdbc:mysql://localhost:3306/test?characterEncoding=UTF-8
driver=com.mysql.cj.jdbc.Driver

明天计划的事情:

明天请假,后天将任务一后面的步骤完成一下,都完成了之后再修改一下整合过后的sql语句以及连接的数据库,改成步骤一中建的表。规范代码和数据库表,把任务一全部完成。


遇到的问题:

在编写修改的代码时遇到了些问题。改了很多次也没运行出来,因为没有整合之前我没有写实现类,只写了测试类,直接在测试类里面写了实现类的东西,后来网上找了一下例子,有了一点思路。之前Update接口里是没有参数的,加上了User思路一下子就通了,很简单的就解决了这个问题。


收获:

熟悉了spring和mybatis简单的整合过程,在之后还是需要多加练习。


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