整合Spring、Mybatisd对单表进行增删查改
这段时间正在学习Spring和Mybatis,自己写的一个小实验，欢迎大家交流学习
1.创建一个maven项目
2.整理好项目目录结构
3.在pom.xml文件里面导入依赖
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/commons-beanutils/commons-beanutils -->
<dependency>
<groupId>commons-beanutils</groupId>
<artifactId>commons-beanutils</artifactId>
<version>1.9.4</version>
</dependency>
<!-- https://mvnrepository.com/artifact/dom4j/dom4j -->
<dependency>
<groupId>dom4j</groupId>
<artifactId>dom4j</artifactId>
<version>1.6.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.13</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-aop -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-aspects -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.4</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.38</version>
</dependency>
</dependencies>
4.配置好applicatioinContext.xml文件和UserMapper.xml
这里需要注意UserMapper.xml在resource的位置需要和UserMapper在java的位置相同
applicatioinContext.xml：
<?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"
xmlns:mybatis="http://mybatis.org/schema/mybatis-spring" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://mybatis.org/schema/mybatis-spring http://mybatis.org/schema/mybatis-spring.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
<context:component-scan base-package="com.lp.mybatisspring"/>
<!--
配置数据源数据库连接 -->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="username" value="root"/>
<property name="password" value="123456"/>
<property name="url" value="jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf8&useSSL=false"/>
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
</bean>
<!-- 事务管理器 完成手动事务管理-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
</bean>
<mybatis:scan base-package="com.lp.mybatisspring.dao"/>
<tx:annotation-driven transaction-manager="transactionManager"/>
</beans>
将数据库操作写在UserMapper.xml中
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!--命名空间-->
<!--书写user表的sql语句
比如：增删查改-->
<!--每一个sql语句都有一个唯一id-->
<mapper namespace="com.lp.mybatisspring.dao.UserMapper">
<select id="getUserById" parameterType="int" resultType="com.lp.mybatisspring.bean.User">
select id,username from users where id = #{
id}
</select>
<!-- keyProperty 获取到的新插入的记录的主键赋值给返回对象的属性 -->
<insert id="saveUser" parameterType="com.lp.mybatisspring.bean.User" useGeneratedKeys="true" keyProperty="id">
insert into users(username) values(#{
username});
</insert>
<!-- 多个用户对象 ， mybatis 会自动判断多个User，自动封装成集合 -->
<select id="listUser" resultType="com.lp.mybatisspring.bean.User">
select id,username from users ;
</select>
<update id="updateUser" parameterType="com.lp.mybatisspring.bean.User" >
update users set username=#{
username} where id=#{
id}
</update>
<delete id="deleteUser" parameterType="int">
delete from users where id=#{
id}
</delete>
</mapper>
5.在bean中写好user实体类
切记与你自己数据库里的属性对应
例如：
与其对应的user类
package com.lp.mybatisspring.bean;
public class User {
private Integer id;
private String username;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
'}';
}
}
6.写好三层架构
Dao层里面的UserMapper接口写好要实现的方法：
package com.lp.mybatisspring.dao;
import com.lp.mybatisspring.bean.User;
import org.springframework.stereotype.Repository;
import java.util.List;
@Repository
public interface UserMapper {
public User getUserById(int id) ;
public boolean saveUser(User user);
public List<User> listUser();
void updateUser(User user);
void deleteUser(int id);
/* *//*查找用户*//*
User selectUser(int id);
*//*根据id修改用户信息*//*
int updateById(User user);
*//*插入数据*//*
int insertPerson(User user);
*//*删除用户信息*//*
int deleteAll(User user);
*/
}
service层：UserService接口
package com.lp.mybatisspring.service;
import com.lp.mybatisspring.bean.User;
import org.springframework.stereotype.Repository;
import java.util.List;
public interface UserService {
public User getUserById(int id);
public boolean save(User user);
public List<User> listUser();
void updateUser(User user);
void deleteUser(int id);
}
UserServiceimlp类：
package com.lp.mybatisspring.service.impl;
import com.lp.mybatisspring.bean.User;
import com.lp.mybatisspring.dao.UserMapper;
import com.lp.mybatisspring.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import java.util.List;
@Service()
public class UserServiceimpl implements UserService{
@Autowired
private UserMapper userMapper;
@Override
@Transactional(readOnly = true)
public User getUserById(int id) {
return userMapper.getUserById(id);
}
@Override
@Transactional
public boolean save(User user) {
boolean flag = userMapper.saveUser(user);
System.out.println(user);
return flag;
}
@Override
public List<User> listUser() {
return userMapper.listUser();
}
@Override
public void updateUser(User user) {
userMapper.updateUser(user);
}
@Override
public void deleteUser(int id) {
userMapper.deleteUser(id);
}
}
Controller层实现方法
package com.lp.mybatisspring.controller;
import com.lp.mybatisspring.bean.User;
import com.lp.mybatisspring.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
@Controller
public class UserController {
@Autowired
private UserService userService;
public void test(){
// User user = userService.getUserById(4);
// user.setUsername("jack");
// System.out.println(user);
/* User user = new User(null,"lp");
boolean flag = userService.save(user);
System.out.println(flag);*/
/* List userList = userService.listUser();
for (User user : userList) {
System.out.println(user);
}*/
//userService.updateUser(user);
userService.deleteUser(4);
}
}
7.demo里面Test类测试
package com.lp.mybatisspring.demo;
import com.lp.mybatisspring.controller.UserController;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Test {
public static void main(String[] args) {
ApplicationContext context =new ClassPathXmlApplicationContext("com/lp/mybatisspring/config/applicatioinContext.xml");
UserController userController= (UserController) context.getBean("userController");
userController.test();
}
}
需要源码的欢迎留言，我经常在线
菜鸡一枚，欢迎大家交流学习