Spring整合Mybatis

Posted 2021-06-17 滑稽404＃

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文章目录

一、所需依赖和静态过滤

使用了properties指定版本，方便后期因为版本兼容问题而浪费时间

	<properties>
        <spring-version>5.3.6</spring-version>
        <mybatis-version>3.5.7</mybatis-version>
        <mybatis-spring-version>2.0.6</mybatis-spring-version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring-version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring-version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>${spring-version}</version>
        </dependency>

        <!--AOP切面两依赖-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${spring-version}</version>
        </dependency>
        <!--切面-->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.13</version>
        </dependency>

        <!--mysql连接驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.32</version>
        </dependency>

        <!--spring自己封装的jdbc-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${spring-version}</version>
        </dependency>


        <!--事务依赖 Transaction -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${spring-version}</version>
        </dependency>

        <!--spring整合数据层框架所需依赖 orm：持久化-->
        <dependency>
            <groupId>springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>1.2.6</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>${mybatis-spring-version}</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>${mybatis-version}</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/log4j/log4j -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
    </dependencies>


    <build>
        <!--静态资源过滤-->
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
    </build>

二、db&log4j

db.properties

serverTimezone=UTC：统一时区，防止jdbc因为时间不统一报错
为什么前缀加个db.，因为dataSource有时候会识别不出username是底层的还是直接写的
这两个错误很恶心，不过挺好查的(因为遇到的人很多)

db.driver=com.mysql.jdbc.Driver
db.url=jdbc:mysql://localhost:3306/db5?serverTimezone=UTC
db.username=username
db.password=password

log4j.properties

网上log4j配置很多，我是博客找的

### 设置###
log4j.rootLogger = debug,stdout,D,E

### 输出信息到控制抬 ###
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n

### 输出DEBUG 级别以上的日志到=E://logs/error.log ###
log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
log4j.appender.D.File = E://logs/log.log
log4j.appender.D.Append = true
log4j.appender.D.Threshold = DEBUG 
log4j.appender.D.layout = org.apache.log4j.PatternLayout
log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

### 输出ERROR 级别以上的日志到=E://logs/error.log ###
log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
log4j.appender.E.File =E://logs/error.log 
log4j.appender.E.Append = true
log4j.appender.E.Threshold = ERROR 
log4j.appender.E.layout = org.apache.log4j.PatternLayout
log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

三、Application

注册驱动管理数据源dataSource
注册SqlSessionFactory，需要注入dataSouce以及mybatis-config.xml和mapper
注册sqlSessionTemplate，根据构造器注入注入SqlSessionFactory

	<!--开启注解扫描-->
    <context:component-scan base-package="com.chime"/>
    <!--引入外部文件-->
    <context:property-placeholder location="classpath:db.properties"/>

    <!--驱动管理数据源-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="${db.driver}"/>
        <property name="url" value="${db.url}"/>
        <property name="username" value="${db.username}"/>
        <property name="password" value="${db.password}"/>
    </bean>
    <!--生成工厂bean：用来获取sqlSession-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <property name="mapperLocations" value="classpath:com/chime/dao/*Mapper.xml"/>
    </bean>
    <!--sqlSessionTemplate：用来注入mapper-->
    <bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>
	<!--因为Mapper无法生成bean 所以建一个impl 没有自动注入需要set方法-->
    <bean id="userMapper" class="com.chime.dao.UserMapperImpl">
        <property name="sqlSession" ref="sqlSessionTemplate"/>
    </bean>

自动扫描Dao，替代注入SqlSessionTemplate写Impl

	 <!-- 4.配置扫描Dao接口包，动态实现Dao接口注入到spring容器中 -->
        <!--代替手动将SqlSessionTemplate注入到DaoImpl-->
        <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
            <!-- 注入sqlSessionFactory -->
            <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
            <!-- 给出需要扫描Dao接口包 -->
            <property name="basePackage" value="com.chime.dao"/>
        </bean>

四、mybatis-config

	<settings>
        <setting name="logImpl" value="LOG4J"/>
    </settings>
    <typeAliases>
        <package name="com.chime.pojo"/>
    </typeAliases>

五、DaoImpl

1、SqlSessionTemplate

如果使用注解自动注入了就不要再申请bean了，两个同样的bean会冲突

//@Repository("userMapper")
public class UserMapperImpl implements UserMapper{
    //@Autowired
    SqlSessionTemplate sqlSession;
    //注入SqlSessionTemplate,用他来获取mapper

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

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

Service层需要注入Impl

2、配置扫描Dao

@Service("bookService")
public class BookServiceImpl implements BookService {

    @Autowired
    private BookMapper bookMapper;
}

六、使用事务

Spring-事务笔记

A给B转账n元，A需要减n，B需要加n，需要两个dao方法
转账业务需要调用这两个方法，两个必须同时完成或者同时失败（事务）

1、实体类

public class Account {
    private int id;
    private String name;
    private int money;//余额
}

2、Application

注册驱动管理数据源dataSource
注册SqlSessionFactory，需要注入dataSouce以及mybatis-config.xml和mapper
注册sqlSessionTemplate，根据构造器注入注入SqlSessionFactory
开启事务管理器
是否使用注解声明事务，来判断是否开启事务注解或者手动织入事务（切点和切面）

	<!--开启注解扫描-->
    <context:component-scan base-package="com.chime"/>
    <!--引入外部文件-->
    <context:property-placeholder location="classpath:db.properties"/>

    <!--spring-jdbc驱动管理数据源-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="${db.driver}"/>
        <property name="url" value="${db.url}"/>
        <property name="username" value="${db.username}"/>
        <property name="password" value="${db.password}"/>
    </bean>
    <!--生成工厂bean：用来获取sqlSession-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <property name="mapperLocations" value="classpath:com/chime/dao/*Mapper.xml"/>
    </bean>
    <!--sqlSessionTemplate：用来注入mapper-->
    <bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>

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

    <!--开启事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <!--开启事务注解-->
    <!--<tx:annotation-driven transaction-manager="transactionManager"/>-->
    
    <!--配置通知-->
    <tx:advice id="accountAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="*" propagation="REQUIRED"/>
        </tx:attributes>
    </tx:advice>
    <!--配置切面-->
    <aop:config>
        <aop:pointcut id="accountPoint" expression="execution(* com.chime.dao.*.*(..))"/>
        <aop:advisor advice-ref="accountAdvice" pointcut-ref="accountPoint"/>
    </aop:config>

3、mapper和Impl

注解声明组件
自动注入SqlSessionTemplate

@Repository("accountMapper")
public class AccountMapperImpl implements AccountMapper{
    @Autowired
    SqlSessionTemplate sqlSession;

    @Override
    public List<Account> getAllAccount() {
        AccountMapper mapper = sqlSession.getMapper(AccountMapper.class);
        return mapper.getAllAccount();
    }

    @Override
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