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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