Spring整合MyBatis及事務

Spring整合MyBatis步驟，簡單來說就是三步：

1. 導入相關的jar包
2. 編寫配置文件
3. 進行測試

下面詳細說明。

先測試mybatis是否成功：

1、創建一個maven項目。

2、導入jar包

		<dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.8</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <!--Spring-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.1.10.RELEASE</version>
        </dependency>
        <!--Spring jdbc(new)-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.1.10.RELEASE</version>
        </dependency>
        <!--aop aspectjweaver-->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.4</version>
        </dependency>
        <!--mybatis-spring-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.2</version>
        </dependency>

如果xml在java文件下，就要設置資源過濾。

<build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>true</filtering>
            </resource>
        </resources>
</build>

3、編寫實體類User

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private int id;
    private String name;
    private String pwd;
}

4、編寫接口UserMapper

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

5、編寫配置文件UserMapper.xml

<?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">
<mapper namespace="com.llx.mapper.UserMapper">

    <select id="getUserList" resultType="User">
        select * from user;
    </select>

</mapper>

6、編寫核心配置文件 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>
    <properties resource="db.properties"/>

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

    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="${driver}"/>
                <property name="url" value="${url}"/>
                <property name="username" value="${username}"/>
                <property name="password" value="${pwd}"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="com/llx/mapper/xml/UserMapper.xml"/>
    </mappers>

</configuration>

7、測試

@Test
    public void test1() throws IOException {
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(Resources.getResourceAsReader("mybatis-config.xml"));
        SqlSession sqlSession = sqlSessionFactory.openSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        List<User> userList = mapper.getUserList();
        for (User user : userList) {
            System.out.println(user);
        }
    }

若測試成功，則可以進行整合了。

1、在applicationContext.xml中編寫數據源配置

<!--1. 數據源整合-->
    <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"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>
    </bean>

2、在applicationContext.xml中編寫sqlSessionFactory配置

<!-- 2. 注入sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!--掃描包-->
        <!--<property name="configLocation" value="classpath:mybatis-config.xml"/>-->
        <property name="mapperLocations" value="classpath:com/llx/mapper/xml/*.xml"/>
        <property name="typeAliasesPackage" value="com.llx.pojo"/>
    </bean>

3、在applicationContext.xml中編寫sqlSession配置

<!--3. 注入sqlSession-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>

4、此時需要給接口增加實現類，編寫UserMapperImpl

public class UserMapperImpl implements UserMapper {
    private SqlSessionTemplate sqlSession;

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

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

5、將寫的實現類，注入到Spring中

<!--4. 放入Bean-->
    <bean id="userMapperImpl" class="com.llx.mapper.impl.UserMapperImpl">
        <property name="sqlSession" ref="sqlSession"/>
    </bean>

6、測試

@Test
    public void test2() throws IOException {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserMapper userMapperImpl = (UserMapper) context.getBean("userMapperImpl");
        List<User> userList = userMapperImpl.getUserList();

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

事務

事務可以理解爲，把一組業務當成一個業務來做，它們要麼都成功，要麼都失敗。

在項目開發中，事務是非常重要的，它涉及到數據的一致性問題，我們需要確保數據的完整性和一致性。

所以在spring中也要添加事務，進行事務的管理。

具體做法是在spring中去配置聲明式事務。

<!-- 整合事務 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <constructor-arg ref="dataSource" />
    </bean>
<!-- 事務配置增強（一個連接 aop，一個連接transactionManager ） -->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <!--propagation事務的傳播特性-->
            <tx:method name="*" propagation="REQUIRED"/>
        </tx:attributes>
    </tx:advice>
<!-- AOP配置 -->
    <aop:config>
        <aop:pointcut id="txPointCut" expression="execution(* com.llx.mapper.*.*(..))"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/>
    </aop:config>