Spring整合Mybatis-CFANZ编程社区

整合Mybatis

步骤：

导入相关jar包
junit
mybatis
mysql数据库
spring相关
aop置入

mybatis-spring【new】: https://mybatis.org/spring/zh/index.html

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13.1</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.15</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.7</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.3.15</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.3.15</version>
        </dependency>
<!--        使用Spring的API实现Aop-->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.7</version>
        </dependency>
<!--        整合mybatis和spring-->
        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.6</version>
        </dependency>
    </dependencies>

编写配置文件
测试

整合方式一

编写mybatis-config.xml

<?xml version="1.0" encoding="UTF8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <settings>
<!--        日志-->
        <setting name="logImpl" value="STDOUT_LOGGING"/>
<!--        开启缓存-->
        <setting name="cacheEnabled" value="true"/>
<!--        <setting name="logImpl" value="LOG4J"/>-->
<!--        开启驼峰映射-->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>
<!--    别名-->
    <typeAliases>
        <package name="com.lzj.entity"/>
    </typeAliases>
</configuration>

编写spring-dao.xml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:util="http://www.springframework.org/schema/util"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/util https://www.springframework.org/schema/util/spring-util.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:org.springframework.jdbc.datasource
-->
    <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=false&amp;useUnicode=true&amp;characterEncoding=utf-8&amp;serverTimezone=Asia/Shanghai"/>
        <property name="username" value="root"/>
        <property name="password" value="root"/>
    </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:mybatis-config.xml"/>
        <property name="mapperLocations" value="classpath:com/lzj/dao/*.xml"/>
    </bean>

<!--    SqlSessionTemplate：就是我们使用的sqlSession-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
<!--        只能使用构造器注入sqlSessionFactor，因为它没有set方法-->
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>
    
</beans>

需要给接口加实现类[]

接口

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

UserMapper.xml配置文件

<?xml version="1.0" encoding="UTF8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!--namespace=绑定一个对应的Dao/Mapper接口-->
<mapper namespace="com.lzj.dao.UserMapper">
    <!--    select查询-->
    <!--    id对应接口方法的名字-->
    <select id="queryUser" resultType="user">
        select * from mybatis.user
    </select>
</mapper>

实现类

public class UserMapperImpl implements UserMapper{
    //我们所有操作，都使用sqlSession来执行，现在都使用SqlSessionTemplate
    private SqlSessionTemplate sqlSession;

    public void setSqlSession(SqlSessionTemplate sqlSession) {
        this.sqlSession = sqlSession;
    }

    @Override
    public List<User> queryUser() {
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        return mapper.queryUser();
    }
}

将自己写的实现类,注入到Spring中,将编写spring-dao.xml配置文件引入到Spring的applicationContext.xml配置文件中

<?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 http://www.springframework.org/schema/beans/spring-beans.xsd">

    <import resource="spring-dao.xml"></import>

    <bean id="userMapper" class="com.lzj.dao.UserMapperImpl">
        <property name="sqlSession" ref="sqlSession"/>
    </bean>
</beans>

测试使用即可!|

@Test
public void queryUserTest2(){
    ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
    UserMapper userMapper = context.getBean("userMapper", UserMapper.class);
    List<User> users = userMapper.queryUser();
    for (User user : users) {
        System.out.println(user);
    }
}

整合方式二

实现接口类

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

xml中注册接口类

<bean id="userMapper2" class="com.lzj.dao.UserMapperImpl2">
    <property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
</bean>

测试

@Test
public void queryUserTest3(){
    ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
    UserMapper userMapper = context.getBean("userMapper2", UserMapper.class);
    List<User> users = userMapper.queryUser();
    for (User user : users) {
        System.out.println(user);
    }
}