【Spring Framework】12、整合Mybatis

Mybatis-Spring

Mybatis-Spring 中文文档

步骤：

  1. 编写数据源
  2. sqlSessionFactory
  3. sqlSessionTemplate
  4. 给接口添加实现类
  5. 将实现类，注册到spring容器中
  6. 测试

环境搭建

Maven 依赖

<dependencies>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.13.2</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.49</version>
    </dependency>
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.7</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>5.3.7</version>
    </dependency>
    <!-- spring操作数据库的话，还需要一个spring-jdbc-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.3.7</version>
    </dependency>
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.9.6</version>
    </dependency>
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>2.0.6</version>
    </dependency>
</dependencies>
<!--maven 配置文件 资源过滤-->
<build>
    <resources>
        <resource>
            <directory>src/main/java</directory>
            <includes>
                <include>**/*.properties</include>
                <include>**/*.xml</include>
            </includes>
            <filtering>true</filtering>
        </resource>
    </resources>
</build>

数据库表

CREATE TABLE `user` (
  `id` int(10) NOT NULL,
  `name` varchar(30) DEFAULT NULL,
  `pwd` varchar(30) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

User 实体类

package com.xg.pojo;

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

    public User() {
    }

    public User(int id, String name, String pwd) {
        this.id = id;
        this.name = name;
        this.pwd = pwd;
    }

    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 + '\'' +
                '}';
    }
}

UserMapper 接口

package com.xg.mapper;

import com.xg.pojo.User;

import java.util.List;

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

UserMapper.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.xg.mapper.UserMapper">
    <select id="selectUsers" resultType="user">
        select *
        from user
    </select>
</mapper>

mybatis-config.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>

    <typeAliases>
        <package name="com.xg.pojo"/>
    </typeAliases>

</configuration>

方式一 ：SqlSessionTemplate

UserMapperImpl

package com.xg.mapper;

import com.xg.pojo.User;
import org.mybatis.spring.SqlSessionTemplate;

import java.util.List;

public class UserMapperImpl implements UserMapper {
    // 在之前所有操作，都使用 sqlSession 来执行。
    // 现在都 使用 SqlSessionTemplate 来执行。
    private SqlSessionTemplate sqlSession;

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

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

spring-dao.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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd">

    <!-- DataSource : 使用Spring的数据源替换Mybatis 的配置  数据源（c3p0  dbcp  druid-->
    <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"/>
        <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-config.xml-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <!-- 绑定 mapper-->
        <property name="mapperLocations" value="classpath:com/xg/mapper/*.xml"/>
    </bean>

    <!-- SqlSessionTemplate : 就是 SqlSession -->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <!-- 只能使用 构造器注入 参数-->
        <constructor-arg name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>

    <!-- -->
    <bean id="userMapper" class="com.xg.mapper.UserMapperImpl">
        <property name="sqlSession" ref="sqlSession"/>
    </bean>
</beans>

测试类

import com.xg.mapper.UserMapperImpl;
import com.xg.pojo.User;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.util.List;

public class MyTest {
    @Test
    public void springMybatis() {
        ApplicationContext context = new ClassPathXmlApplicationContext("spring-dao.xml");
        UserMapper userMapper = context.getBean("userMapper", UserMapper.class);
        List<User> users = userMapper.selectUsers();
        for (User user : users) {
            System.out.println(user.toString());
        }
    }
}

image

方式二：SqlSessionDaoSupport

UserMapper2Impl

package com.xg.mapper;

import com.xg.pojo.User;
import org.mybatis.spring.support.SqlSessionDaoSupport;

import java.util.List;

public class UserMapper2Impl extends SqlSessionDaoSupport implements UserMapper {
    @Override
    public List<User> selectUsers() {
        return getSqlSession().getMapper(UserMapper.class).selectUsers();
    }
}

spring-dao.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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd">

    <!-- DataSource : 使用Spring的数据源替换Mybatis 的配置  数据源（c3p0  dbcp  druid-->
    <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"/>
        <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-config.xml-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <!-- 绑定 mapper-->
        <property name="mapperLocations" value="classpath:com/xg/mapper/*.xml"/>
    </bean>

    <bean id="userMapper" class="com.xg.mapper.UserMapper2Impl">
        <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>
</beans>

测试类

import com.xg.mapper.UserMapper2Impl;
import com.xg.pojo.User;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.util.List;

public class MyTest {
    @Test
    public void sqlSessionDaoSupportTest(){
        ApplicationContext context = new ClassPathXmlApplicationContext("spring-dao.xml");
        UserMapper userMapper = context.getBean("userMapper", UserMapper.class);
        List<User> users = userMapper.selectUsers();
        for (User user : users) {
            System.out.println(user.toString());
        }
    }
}

image

spring中的事务管理

  • 声明式事务：AOP
  • 编程式事务：需要在代码中，进行事务的管理
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/tx
        https://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/aop
        https://www.springframework.org/schema/aop/spring-aop.xsd">

<!-- DataSource : 使用Spring的数据源替换Mybatis 的配置  数据源（c3p0  dbcp  druid-->
    <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"/>
        <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-config.xml-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <!-- 绑定 mapper-->
        <property name="mapperLocations" value="classpath:com/xg/mapper/*.xml"/>
    </bean>

    <bean id="userMapper" class="com.xg.mapper.UserMapper2Impl">
        <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>

    <!-- 配置声明式事务-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <constructor-arg ref="dataSource"/>
    </bean>
    
    <!-- 结合AOP 实现事物的织入-->
    <!-- 配置事务的类-->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <!-- 给哪些方法配置事务-->
        <!-- 配置事务的 传播特性  propagation 七种传播特性-->
        <tx:attributes>
            <tx:method name="add" propagation="REQUIRED"/>
            <tx:method name="delete"/>
            <tx:method name="update"/>
            <tx:method name="query" read-only="true"/>
            <tx:method name="*" propagation="REQUIRED"/>
        </tx:attributes>
    </tx:advice>

    <!--配置aop织入事务-->
    <aop:config>
        <aop:pointcut id="pointcut" expression="execution(* com.xg.mapper.*.*(..))"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="pointcut"/>
    </aop:config>
</beans>
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