spring整合mybatis

先在IDEA中创建一个Maven项目,加入常用依赖:

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <project xmlns="http://maven.apache.org/POM/4.0.0"
 3          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 5     <modelVersion>4.0.0</modelVersion>
 6 
 7     <groupId>spring-mybatis</groupId>
 8     <artifactId>spring-mybatis</artifactId>
 9     <version>1.0-SNAPSHOT</version>
10     <dependencies>
11         <dependency>
12             <groupId>junit</groupId>
13             <artifactId>junit</artifactId>
14             <version>4.12</version>
15         </dependency>
16         <dependency>
17             <groupId>mysql</groupId>
18             <artifactId>mysql-connector-java</artifactId>
19             <version>5.1.47</version>
20         </dependency>
21         <dependency>
22             <groupId>org.mybatis</groupId>
23             <artifactId>mybatis</artifactId>
24             <version>3.5.2</version>
25         </dependency>
26         <dependency>
27             <groupId>org.mybatis</groupId>
28             <artifactId>mybatis-spring</artifactId>
29             <version>2.0.2</version>
30         </dependency>
31         <dependency>
32             <groupId>org.springframework</groupId>
33             <artifactId>spring-webmvc</artifactId>
34             <version>5.1.8.RELEASE</version>
35         </dependency>
36         <dependency>
37             <groupId>org.springframework</groupId>
38             <artifactId>spring-jdbc</artifactId>
39             <version>5.1.8.RELEASE</version>
40         </dependency>
41         <dependency>
42             <groupId>aspectj</groupId>
43             <artifactId>aspectjweaver</artifactId>
44             <version>1.5.3</version>
45         </dependency>
46         <dependency>
47             <groupId>org.projectlombok</groupId>
48             <artifactId>lombok</artifactId>
49             <version>1.18.8</version>
50         </dependency>
51         <dependency>
52             <groupId>org.springframework</groupId>
53             <artifactId>spring-tx</artifactId>
54             <version>5.1.8.RELEASE</version>
55         </dependency>
56     </dependencies>
57     <build>
58         <resources>
59             <resource>
60                 <directory>src/main/java</directory>
61                 <includes>
62                     <include>**/*.xml</include>
63                 </includes>
64                 <filtering>true</filtering>
65             </resource>
66         </resources>
67     </build>
68 
69 </project>

创建一个pojo类:

 1 package com.cai.pojo;
 2 
 3 import lombok.AllArgsConstructor;
 4 import lombok.Data;
 5 import lombok.NoArgsConstructor;
 6 
 7 @Data
 8 @AllArgsConstructor
 9 @NoArgsConstructor
10 public class User {
11     private Integer id;
12     private String name;
13     private String pwd;
14 }

然后新建一个映射器接口,里面就是一些增删改查的操作:

1 package com.cai.mapper;
2 import com.cai.pojo.User;
3 import java.util.List;
4 public interface UserMapper {
5      List<User> selectUser();
6      int delete(int id);
7      int add(User user);
8      int update(User user);
9 }

然后创建对应的xml映射文件,这里映射文件和接口在同一个包下面:

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE mapper
 3         PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
 4         "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 5 <!-- 配置mybatis -->
 6 
 7 <mapper namespace="com.cai.mapper.UserMapper">
 8     <select id="selectUser" resultType="user">
 9         select * from mybatis.user
10     </select>
11 
12     <insert id="add" parameterType="user">
13         insert into mybatis.user(id,name,pwd) VALUES (#{id},#{name},#{pwd})
14     </insert>
15 
16     <delete id="delete" parameterType="int">
17         deletes from mybatis.user where id=#{id}
18     </delete>
19 </mapper>

因为这是spring整合mybatis,所以对接口必须进行进行实现:

 1 package com.cai.mapper;
 2 
 3 import com.cai.pojo.User;
 4 import org.mybatis.spring.SqlSessionTemplate;
 5 
 6 import java.util.List;
 7 
 8 public class UserMapperImpl implements UserMapper {
 9     
10     private SqlSessionTemplate sqlSession;
11 
12     public void setSqlSession(SqlSessionTemplate sqlSessionTemplate) {
13         this.sqlSession = sqlSessionTemplate;
14     }
15 
16     public List<User> selectUser(){
17         UserMapper user = sqlSession.getMapper(UserMapper.class);
18         return user.selectUser();
19     }
20 
21     public int delete(int i) {
22         return 0;
23     }
24     public int add(User user) {
25         return 0;
26     }
27 
28     public int update(User user) {
29         return 0;
30     }
31 }

然后就需要把这个实现类交给spring进行管理:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
            https://www.springframework.org/schema/beans/spring-beans.xsd">

    <!--DataSource:使用Spring的数据源代替mybatis配置-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://127.0.0.1:3306/mybatis?useSSL=false"/>
        <property name="username" value="root"/>
        <property name="password" value="123"/>
    </bean>

    <!--sqlSessionFaction-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <!--绑定mybatis配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <property name="mapperLocations" value="classpath:com/cai/mapper/*.xml"/>
    </bean>
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <!--只能使用构造器注入sqlSession-->
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>
    <bean id="userMapper" class="com.cai.mapper.UserMapperImpl">
        <property name="sqlSession" ref="sqlSession"/> <!--这里name就是UserMapperImpl中的sqlSession-->
    </bean>
</beans>

后还要有一个mybatis-config.xml文件:

<?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">
<!-- 配置mybatis -->
<configuration>

    <!-- 配置别名 -->
    <typeAliases>
        <package name="com.cai.pojo"/>
    </typeAliases>
</configuration>

然后就可以进行测试:

import com.cai.mapper.UserMapper;import com.cai.pojo.User;import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.io.IOException;import java.util.List;
public class MyTest {
    public static void main(String[] args) throws IOException {    
        ApplicationContext app = new ClassPathXmlApplicationContext("spring-dao.xml");
        UserMapper user = app.getBean("userMapper",UserMapper.class);
        for (User usr : user.selectUser()){
            System.out.println(String.valueOf(usr));
        }
    }
}

 

posted on 2020-06-05 21:14  Difcipo  阅读(66)  评论(0编辑  收藏  举报

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