Spring+Mybatis整合的两种方式

Spring+Mybatis整合

引言

MyBatis框架开发:环境搭建(依赖、创建数据库连接) >> 建表 >> 实体类 >> 接口 >> 代理接口(SQL) >> 测试

spring+MyBatis框架开发:环境搭建(依赖、spring-mybatis.XML(创建连接、sqlSessionFactory、sqlSession)) >> 建表 >> 实体类 >> 接口 >> 代理接口(SQL) >> 接口实现类(获取SqlSession) >> 测试

Spring+Mybatis整合的两种方式区别:

  • SqlSessionTemplate方式:sqlSessionFactory、sqlSession全部由配置文件创建,再通过接口实现类获取sqlsession
  • SqlSessionDaoSuppory方式:sqlSessionFactory由配置文件创建,接口实现类通过继承SqlSessionDaoSupport来getSqlSession。

SqlSessionTemplate方式

  1. 搭建环境

    		<dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.13</version>
                <scope>test</scope>
            </dependency>
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>8.0.22</version>
            </dependency>
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis</artifactId>
                <version>3.5.6</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-webmvc</artifactId>
                <version>5.3.4</version>
            </dependency>
            <!-- Spring操作数据库还需要一个spring-jdbc -->
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-jdbc</artifactId>
                <version>5.3.4</version>
            </dependency>
            <!-- AOC织入包 -->
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis-spring</artifactId>
                <version>2.0.6</version>
            </dependency>
    		<!-- lombok包 -->
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>1.18.18</version>
            </dependency>
    

    lombok包常用注解

    @Data 类自动获取get、set方法(常用)
    @NoArgsConstructor 空参构造方法
    @AllArgsConstructor 全参构造方法
    @ToString 生成toString方法
    @Value 把所有成员变量默认定义为private final修饰,并且不会生成set方法。
    @Log4j 提供一个 属性名为log 的 log4j 日志对象

  2. 建表

     oiling | CREATE TABLE `oiling` (
      `id` int NOT NULL AUTO_INCREMENT,
      `name` varchar(10) DEFAULT NULL,
      `pwd` varchar(15) DEFAULT NULL,
      PRIMARY KEY (`id`)
    ) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8
    
  3. 创建表对应的实体类

    package com.sheep.pojo;
    import lombok.Data;
    
    @Data
    public class Oiling{
        private int id;
        private String name;
        private String pwd;
    }
    
  4. 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>
        <!-- 不需要任何配置 -->
    </configuration>
    
  5. spring-mybatis.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 http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
    
        <!-- DataSource:使用Spring的数据源替换MyBatis的配置。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.cj.jdbc.Driver"/>
            <property name="url" value="jdbc:mysql://localhost:3306/user01?serverTimezone=UTC&amp;useUnicode=true&amp;characterEncoding=utf8&amp;useSSL=true"/>
            <property name="username" value="root"/>
            <property name="password" value="123321"/>
        </bean>
        <!-- sqlSessionFactory -->
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
            <property name="dataSource" ref="datasource"/>
            <!-- 绑定MyBatis配置文件(可添加,也可不添加)-->
            <property name="configLocation" value="classpath:config.XML"/>
            <property name="mapperLocations" value="classpath:com/sheep/mapper/*.XML"/>
        </bean>
        <!-- SqlSessionTemplate = sqlSession -->
        <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
            <!-- 只能使用构造器注入sqlSessionFactory,应为他没有set方法 -->
            <constructor-arg index="0" ref="sqlSessionFactory"/>
        </bean>
    
        <!-- 注册Bean -->
        <bean id="oilingMapper" class="com.sheep.mapper.OilingMapperImpl">
            <property name="sqlSession" ref="sqlSession"/>
        </bean>
    </beans>
    
  6. 创建接口

    package com.sheep.mapper;
    import com.sheep.pojo.Oiling;
    import java.util.List;
    
    public interface OilingMapper {
        //查询所有
        public List<Oiling> selectOiling();
    }
    
  7. 代理接口

    <?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.sheep.mapper.OilingMapper">
        <select id="selectOiling" resultType="com.sheep.pojo.Oiling">
            select * from oiling;
        </select>
    </mapper>
    
  8. 创建接口实现类

    package com.sheep.mapper;
    import com.sheep.pojo.Oiling;
    import org.mybatis.spring.SqlSessionTemplate;
    import java.util.List;
    /**
     *我们的所有操作,都是用sqlSession来执行,但是整合spring之后使用SqlSessionTemplate;
     * */
    public class OilingMapperImpl implements OilingMapper {
    
        //使用SqlSessionTemplate相当于sqlSession
        private SqlSessionTemplate sqlSession;
    
        public void setSqlSession(SqlSessionTemplate sqlSession) {
            this.sqlSession = sqlSession;
        }
        public List<Oiling> selectOiling() {
            OilingMapper mapper = sqlSession.getMapper(OilingMapper.class);
            return mapper.selectOiling();
        }
    }
    
  9. 将接口实现类交给IoC容器

    <!-- 注册Bean -->
    <bean id="oilingMapper" class="com.sheep.mapper.OilingMapperImpl">
        <property name="sqlSession" ref="sqlSession"/>
    </bean>
    
  10. 测试

    import com.sheep.mapper.OilingMapper;
    import com.sheep.pojo.Oiling;
    import org.junit.Test;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class Test2 {
        @Test
        public void test(){
            ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring-dao.XML");
            OilingMapper mapper = applicationContext.getBean("oilingMapper", OilingMapper.class);
            for (Oiling oiling:mapper.selectOiling()){
                System.out.println(oiling);
            }
        }
    }
    

SqlSessionDaoSuppory方式

  1. 环境

    dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.13</version>
                <scope>test</scope>
            </dependency>
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>8.0.22</version>
            </dependency>
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis</artifactId>
                <version>3.5.6</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-webmvc</artifactId>
                <version>5.3.4</version>
            </dependency>
            <!-- Spring操作数据库还需要一个spring-jdbc -->
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-jdbc</artifactId>
                <version>5.3.4</version>
            </dependency>
            <!-- AOC织入包 -->
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis-spring</artifactId>
                <version>2.0.6</version>
            </dependency>
    		<!-- lombok包 -->
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>1.18.18</version>
            </dependency>
    
  2.  oiling | CREATE TABLE `oiling` (
      `id` int NOT NULL AUTO_INCREMENT,
      `name` varchar(10) DEFAULT NULL,
      `pwd` varchar(15) DEFAULT NULL,
      PRIMARY KEY (`id`)
    ) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8
    
  3. 实体类

    package com.sheep.pojo;
    import lombok.Data;
    
    @Data
    public class Oiling{
        private int id;
        private String name;
        private String pwd;
    }
    
  4. 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>
        <!-- 不需要任何配置 -->
    </confiation>
    
  5. spring-mybatis.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 http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
    
        <!-- DataSource:使用Spring的数据源替换MyBatis的配置。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.cj.jdbc.Driver"/>
            <property name="url" value="jdbc:mysql://localhost:3306/user01?serverTimezone=UTC&amp;useUnicode=true&amp;characterEncoding=utf8&amp;useSSL=true"/>
            <property name="username" value="root"/>
            <property name="password" value="123321"/>
        </bean>
        <!-- sqlSessionFactory -->
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
            <property name="dataSource" ref="datasource"/>
            <!-- 绑定MyBatis配置文件(可添加,也可不添加)-->
            <property name="configLocation" value="classpath:config.XML"/>
            <property name="mapperLocations" value="classpath:com/sheep/mapper/*.XML"/>
        </bean>
        
        <!-- 不需要在配置文件中创建sqlSession -->
        <!--    &lt;!&ndash; SqlSessionTemplate = sqlSession &ndash;&gt;-->
    <!--    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">-->
    <!--        &lt;!&ndash; 只能使用构造器注入sqlSessionFactory,应为他没有set方法 &ndash;&gt;-->
    <!--        <constructor-arg index="0" ref="sqlSessionFactory"/>-->
    <!--    </bean>-->
    
        <!-- 注册Bean -->
        <bean id="oilingMapperImpl2" class="com.sheep.mapper.OilingMapperImpl2">
            <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
        </bean>
    </beans>
    
  6. 创建接口

    package com.sheep.mapper;
    import com.sheep.pojo.Oiling;
    import java.util.List;
    
    public interface OilingMapper {
        //查询所有
        public List<Oiling> selectOiling();
    }
    
  7. 代理接口

    <?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.sheep.mapper.OilingMapper">
        <select id="selectOiling" resultType="com.sheep.pojo.Oiling">
            select * from oiling;
        </select>
    </mapper>
    
  8. 创建接口实现类

    package com.sheep.mapper;
    
    import com.sheep.pojo.Oiling;
    import org.mybatis.spring.support.SqlSessionDaoSupport;
    
    import java.util.List;
    
    public class OilingMapperImpl2 extends SqlSessionDaoSupport implements OilingMapper {
        @Override
        public List<Oiling> selectOiling() {
            return getSqlSession().getMapper(OilingMapper.class).selectOiling();
        }
    }
    
  9. 将接口实现类交给IoC容器

    <bean id="oilingMapperImpl2" class="com.sheep.mapper.OilingMapperImpl2">
        <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>
    
  10. 测试

    import com.sheep.mapper.OilingMapper;
    import com.sheep.pojo.Oiling;
    import org.junit.Test;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class Test2 {
        @Test
        public void test(){
            ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring-dao.XML");
            OilingMapper mapper = applicationContext.getBean("oilingMapperImpl2", OilingMapper.class);
            for (Oiling oiling:mapper.selectOiling()){
                System.out.println(oiling);
            }
        }
    }
    

Spring事务声明

引言

事务必须服从ACID原则,即原子性(atomicity)、一致性(consistency)、隔离性(isolation)、持久性(durability)可理解为,事务其实就是一系列指令的集合。

  • 原子性:操作这些指令时,要么全部执行成功,要么全部不执行,只要其中一个指令执行失败,所有的指令都执行失败,数据进行回滚,回到执行指令前的数据状态。
  • 一致性:事务的执行数据从一个状态转换为另一个状态,但对于整个数据的完整性保持稳定。
  • 隔离性:在该事务的执行过程中,无论发生任何数据的改变都应该只存在该事务中,对于外界不存在让任何影响。只有在事务确定正确提交之后,才会显示该事务对数据的改变。其他事务才能获取到这些改变后的数据。
  • 持久性:当事务正确完成后它对于数据的改变是永久性的。

spring中的事务管理

  1. 在mybatis-spring.XML中添加事务管理

     	<!-- 配置声明式事务 -->
        <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <constructor-arg ref="datasource"/>
        </bean>
        <!-- 结合AOP实现事务织入 -->
        <!-- 1、配置事务通知 -->
        <tx:advice id="txAdvice" transaction-manager="transactionManager">
            <!-- 给那些方法配置事务 -->
            <!-- 配置事务的传播特性 new propagation-->
            <tx:attributes>
                <tx:method name="add" propagation="REQUIRED"/>
                <tx:method name="delete" propagation="REQUIRED"/>
                <tx:method name="update" propagation="REQUIRED"/>
                <tx:method name="query" read-only="true"/>
            </tx:attributes>
        </tx:advice>
        <!-- 配置事务切入 -->
        <aop:config>
            <aop:pointcut id="txPointCut" expression="execution(* com.sheep.mapper.*.*(..))"/>
            <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/>
        </aop:config>
    

posted @ 2021-04-01 10:33  一程山水一年华^_^  阅读(204)  评论(0)    收藏  举报
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