2021-03-23 spring整合Mybatis

spring整合Mybatis

步骤：

1、导入相关jar包

junit

mybatis

mysql数据库

spring相关的

aop织入

mybatis-spring【new】

<dependencies>
        <!--junit-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <!--mysql数据库-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <!--mybatis-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <!--spring相关的-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <!--aop织入-->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.13</version>
        </dependency>
        <!--mybatis-spring【new】-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.2</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.10</version>
        </dependency>
    </dependencies>
    <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>true</filtering>
            </resource>

        </resources>
    </build>

2、编写配置文件

3、测试

回忆 Mybatis

1、编写实体类

public class User {
   private int id;
   private String name;
   private String pwd;

}

2、编写核心配置文件

<?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">
<!--configuaration核心配置文件-->
<configuration>
    <!--别名-->
    <typeAliases>
        <package name="com.kuang.pojo"/>
    </typeAliases>
    
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/coach?useSSL=true&amp;useUnicode=true&amp;characterEncoding=utf-8&amp;serverTimezone=UTC&amp;allowMultiQueries=true"/>
                <property name="username" value="root"/>
                <property name="password" value="123456"/>
            </dataSource>
        </environment>
    </environments>
<!--注册接口-->
    <mappers>
        <mapper class="com.kuang.pojo.mapper.UserMapper"/>
    </mappers>
</configuration>

3、编写接口

import java.util.List;

public interface UserMapper {
    public List<User> selectUser();
}

4、编写Mapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">


<mapper namespace="com.kuang.pojo.mapper.UserMapper">
    <select id="selectUser" resultType="user">
        select * from mybatis.user;
    </select>
</mapper>

接口和对应的Mapper.xml放在同一目录下

5、测试

public class Mytest {
    @Test
    public void  test() throws IOException {
        String resource = "MybatisConfig.xml";
        InputStream in = Resources.getResourceAsStream(resource);
        SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(in);
        SqlSession sqlSession = sessionFactory.openSession(true);

        UserMapper mapper =sqlSession.getMapper(UserMapper.class);
        List<User> userList =mapper.selectUser();

        for (User user :userList){
            System.out.println(user);
        }

    }
}

spring整合mybatis

1、编写数据源配置“datasource”

2、sqlSessionFactory

3、sqlSessionTemplate

<?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的数据源替换Mybatis的配置 c3p0  dbcp  druid
    我们这里使用Spring提供的JDBC-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=utf-8&amp;serverTimezone=UTC&amp;allowMultiQueries=true"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>
    </bean>
    <!--sqlSessionFactory-->
    <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:MybatisConfig.xml"/>
        <property name="mapperLocations" value="classpath:com/kuang/pojo/mapper/UserMapper.xml"/>
    </bean>

<!--sqlSessionTemplate:这是我们使用的sqlSession-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <!--只能使用构造器注入，因为他没有set方法-->
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>
<!--注入实现类-->
    <bean id="userMapper" class="com.kuang.pojo.mapper.UserMapperImpl">
        <property name="sqlSession" ref="sqlSession"/>
    </bean>
</beans>

4、需要给接口加实现类

public class UserMapperImpl  implements UserMapper{
     SqlSessionTemplate sqlSession;

    public void  setSqlSession(SqlSessionTemplate sqlSession){
        this.sqlSession = sqlSession;
    }
    public List<User> selectUser(){
        UserMapper mapper =sqlSession.getMapper(UserMapper.class);
        return  mapper.selectUser();
    }
}

5、将自己写的实现类，注入到Spring中

方式二

1、先让实现类继承SqlSessionDaoSupport再实现接口（通过SqlSessionDaoSupport里的getSqlSession来调用接口的方法）

public class UserMapperImpl2 extends SqlSessionDaoSupport implements UserMapper {
    public List<User> selectUser() {
        return getSqlSession().getMapper(UserMapper.class).selectUser();
    }
}

2、在注册到spring容器中（参数是sqlSessionFactory）

<bean id="userMapper2" class="com.kuang.pojo.mapper.UserMapperImpl2">
   <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
</bean>