• spring与mybatis三种整合方法


    原文:链接 https://www.cnblogs.com/wangmingshun/p/5674633.html

    1、采用MapperScannerConfigurer,它将会查找类路径下的映射器并自动将它们创建成MapperFactoryBean。
    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" xmlns:p="http://www.springframework.org/schema/p"
        xmlns:context="http://www.springframework.org/schema/context"
        xmlns:mvc="http://www.springframework.org/schema/mvc"
        xsi:schemaLocation="http://www.springframework.org/schema/beans  
                            http://www.springframework.org/schema/beans/spring-beans-3.1.xsd  
                            http://www.springframework.org/schema/context  
                            http://www.springframework.org/schema/context/spring-context-3.1.xsd  
                            http://www.springframework.org/schema/mvc  
                            http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
        <!-- 自动扫描 -->
        <context:component-scan base-package="com.hua.saf" />
        <!-- 引入配置文件 -->
        <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
            <property name="location" value="classpath:jdbc.properties" />
        </bean>
    
        <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
            <property name="driverClassName" value="${driver}" />
            <property name="url" value="${url}" />
            <property name="username" value="${username}" />
            <property name="password" value="${password}" />
            <!-- 初始化连接大小 -->
            <property name="initialSize" value="${initialSize}" />
            <!-- 连接池最大数量 -->
            <property name="maxActive" value="${maxActive}" />
            <!-- 连接池最大空闲 -->
            <property name="maxIdle" value="${maxIdle}" />
            <!-- 连接池最小空闲 -->
            <property name="minIdle" value="${minIdle}" />
            <!-- 获取连接最大等待时间 -->
            <property name="maxWait" value="${maxWait}" />
        </bean>
    
        <!-- spring和MyBatis完美整合,不需要mybatis的配置映射文件 -->
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
            <property name="dataSource" ref="dataSource" />
            <!-- 自动扫描mapping.xml文件,**表示迭代查找 -->
            <property name="mapperLocations" value="classpath:com/hua/saf/**/*.xml" />
        </bean>
    
        <!-- DAO接口所在包名,Spring会自动查找其下的类 ,包下的类需要使用@MapperScan注解,否则容器注入会失败 -->
        <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
            <property name="basePackage" value="com.hua.saf.*" />
            <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
        </bean>
        
        <!-- (事务管理)transaction manager, use JtaTransactionManager for global tx -->
        <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <property name="dataSource" ref="dataSource" />
        </bean>    
    </beans>

     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">
    <!-- 为这个mapper指定一个唯一的namespace,namespace的值习惯上设置成包名+sql映射文件名,这样就能够保证namespace的值是唯一的
    例如namespace="me.gacl.mapping.userMapper"就是me.gacl.mapping(包名)+userMapper(userMapper.xml文件去除后缀)
    -->
    <mapper namespace="com.hua.saf.dao.UserDao">
      <!-- 
      在select标签中编写查询的SQL语句, 设置select标签的id属性为getUser,id属性值必须是唯一的,不能够重复,
      使用parameterType属性指明查询时使用的参数类型,resultType属性指明查询返回的结果集类型
      resultType="com.hua.saf.User"就表示将查询结果封装成一个User类的对象返回,User类就是t_user表所对应的实体类
      -->
      <!-- 根据id查询得到一个user对象-->
      <select id="getUser" parameterType="int" resultType="com.hua.saf.pojo.User">
        select * from t_user where id=#{id}
      </select>
    </mapper>

    dao类:

    /** 
    * 这里的@MapperScan就是上面所讲的Mapper扫描器中所需要的配置,会自动生成代理对象。 
    * 注意,接口中的方法名称要和对应的MyBatis映射文件中的语句的id值一样,因为生成的 
    * 动态代理,会根据这个匹配相应的Sql语句执行。另外就是方法的参数和返回值也需要注 
    * 意。接口中的方法如何定义,对应的MyBatis映射文件就应该进行相应的定义。 
    * 最后,标注中的userDao是用来作为Spring的Bean的id(或name)进行使用的,方便我 
    * 们在Service层进行注入使用。 
    */ 
    
    @MapperScan
    public interface UserDao {
      //此处的方法名必须和mapper中的映射文件中的id同名
      //回去映射文件中通过com.hua.saf.dao.UserDao.getUser,即this.getClass().getName()+".getUser"
      public User getUser(int id);
    }

    service类:

    @Service("userService")
    public class UserServiceImpl implements IUserService {
    
    @Resource
    private UserDao userDao;
    
      public User getUser(int id) {
        return userDao.getUser(id);
      }
    }

    2、采用接口org.apache.ibatis.session.SqlSession的实现类org.mybatis.spring.SqlSessionTemplate。
      mybatis中, sessionFactory可由SqlSessionFactoryBuilder.来创建。MyBatis-Spring 中,使用了SqlSessionFactoryBean来替代。SqlSessionFactoryBean有一个必须属性dataSource,另外其还有一个通用属性configLocation(用来指定mybatis的xml配置文件路径)。
    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" xmlns:p="http://www.springframework.org/schema/p"
        xmlns:context="http://www.springframework.org/schema/context"
        xmlns:mvc="http://www.springframework.org/schema/mvc"
        xsi:schemaLocation="http://www.springframework.org/schema/beans  
                            http://www.springframework.org/schema/beans/spring-beans-3.1.xsd  
                            http://www.springframework.org/schema/context  
                            http://www.springframework.org/schema/context/spring-context-3.1.xsd  
                            http://www.springframework.org/schema/mvc  
                            http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
        <!-- 自动扫描 -->
        <context:component-scan base-package="com.hua.saf" />
        <!-- 引入配置文件 -->
        <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
            <property name="location" value="classpath:jdbc.properties" />
        </bean>
    
        <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
            <property name="driverClassName" value="${driver}" />
            <property name="url" value="${url}" />
            <property name="username" value="${username}" />
            <property name="password" value="${password}" />
            <!-- 初始化连接大小 -->
            <property name="initialSize" value="${initialSize}" />
            <!-- 连接池最大数量 -->
            <property name="maxActive" value="${maxActive}" />
            <!-- 连接池最大空闲 -->
            <property name="maxIdle" value="${maxIdle}" />
            <!-- 连接池最小空闲 -->
            <property name="minIdle" value="${minIdle}" />
            <!-- 获取连接最大等待时间 -->
            <property name="maxWait" value="${maxWait}" />
        </bean>
    
        <!-- spring和MyBatis完美整合,不需要mybatis的配置映射文件 -->
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
            <property name="dataSource" ref="dataSource" />
            <property name="configLocation"  value="classpath:sqlMapConfig.xml"/>
            <!-- 自动扫描mapping.xml文件,**表示迭代查找,也可在sqlMapConfig.xml中单独指定xml文件-->
            <property name="mapperLocations" value="classpath:com/hua/saf/**/*.xml" />
        </bean>
        
        <!-- mybatis spring sqlSessionTemplate,使用时直接让spring注入即可 -->
        <bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
            <constructor-arg index="0" ref="sqlSessionFactory"></constructor-arg>
        </bean>
    
        <!-- (事务管理)transaction manager, use JtaTransactionManager for global tx -->
        <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <property name="dataSource" ref="dataSource" />
        </bean>
    </beans>

    sqlMapConfig.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>
            <typeAlias type="com.hua.saf.pojo.User" alias="User" />
        </typeAliases>
    </configuration>

    User.java

    public class User {
        
        private int id;
        private String username;
        private String password;
        private int age;
         
        public int getId() {
            return id;
        }
        public void setId(int id) {
            this.id = id;
        }
        public String getUsername() {
            return username;
        }
        public void setUsername(String username) {
            this.username = username;
        }
        public String getPassword() {
            return password;
        }
        public void setPassword(String password) {
            this.password = password;
        }
        public int getAge() {
            return age;
        }
        public void setAge(int age) {
            this.age = age;
        }
    }
    复制代码

    UserDao.java

    @Repository
    public class UserDao{
    
        @Resource
        private SqlSessionTemplate sqlSessionTemplate;
        
        public User getUser(int id) {
            return sqlSessionTemplate.selectOne(this.getClass().getName() + ".getUser", 1);
        }   
    }

    UserService.java

    @Service
    public class UserService{
        
        @Resource
        private UserDao userDao;
        
        public User getUser(int id) {
            return userDao.getUser(id);
        }
    }

    3、采用抽象类org.mybatis.spring.support.SqlSessionDaoSupport提供SqlSession。
    spring-mybatis.xml

    复制代码
    <?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:p="http://www.springframework.org/schema/p"
        xmlns:context="http://www.springframework.org/schema/context"
        xmlns:mvc="http://www.springframework.org/schema/mvc"
        xsi:schemaLocation="http://www.springframework.org/schema/beans  
                            http://www.springframework.org/schema/beans/spring-beans-3.1.xsd  
                            http://www.springframework.org/schema/context  
                            http://www.springframework.org/schema/context/spring-context-3.1.xsd  
                            http://www.springframework.org/schema/mvc  
                            http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
        <!-- 自动扫描 -->
        <context:component-scan base-package="com.hua.saf" />
        <!-- 引入配置文件 -->
        <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
            <property name="location" value="classpath:jdbc.properties" />
        </bean>
    
        <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
            <property name="driverClassName" value="${driver}" />
            <property name="url" value="${url}" />
            <property name="username" value="${username}" />
            <property name="password" value="${password}" />
            <!-- 初始化连接大小 -->
            <property name="initialSize" value="${initialSize}" />
            <!-- 连接池最大数量 -->
            <property name="maxActive" value="${maxActive}" />
            <!-- 连接池最大空闲 -->
            <property name="maxIdle" value="${maxIdle}" />
            <!-- 连接池最小空闲 -->
            <property name="minIdle" value="${minIdle}" />
            <!-- 获取连接最大等待时间 -->
            <property name="maxWait" value="${maxWait}" />
        </bean>
    
        <!-- spring和MyBatis完美整合,不需要mybatis的配置映射文件 -->
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
            <property name="dataSource" ref="dataSource" />
            <property name="configLocation"  value="classpath:sqlMapConfig.xml"/>
            <!-- 自动扫描mapping.xml文件,**表示迭代查找,也可在sqlMapConfig.xml中单独指定xml文件-->
            <property name="mapperLocations" value="classpath:com/hua/saf/**/*.xml" />
        </bean>
    
        <!-- (事务管理)transaction manager, use JtaTransactionManager for global tx -->
        <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <property name="dataSource" ref="dataSource" />
        </bean>
    </beans>
    复制代码

    sqlMapConfig.xml

    复制代码
    <?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>
            <typeAlias type="com.hua.saf.pojo.User" alias="User" />
        </typeAliases>
    </configuration>
    复制代码

    User.java

    复制代码
    public class User {
        
        private int id;
        private String username;
        private String password;
        private int age;
        
        
        public int getId() {
            return id;
        }
        public void setId(int id) {
            this.id = id;
        }
        public String getUsername() {
            return username;
        }
        public void setUsername(String username) {
            this.username = username;
        }
        public String getPassword() {
            return password;
        }
        public void setPassword(String password) {
            this.password = password;
        }
        public int getAge() {
            return age;
        }
        public void setAge(int age) {
            this.age = age;
        }
    }
    复制代码

    UserDao.java

    复制代码
    @Repository
    public class UserDao extends SqlSessionDaoSupport{
        
        public User getUser(int id) {
            return this.getSqlSession().selectOne(this.getClass().getName() + ".getUser", 1);
        }
      //使用SqlSessionDaoSupport必须注意,此处源码1.1.1中有自动注入,1.2中取消了自动注入,需要手工注入,侵入性强
      //也可在spring-mybatis.xml中如下配置,但是这种有多少个dao就要配置到少个,多个dao就很麻烦。
      //<bean id="userDao" class="com.hua.saf.dao.UserDao">
      //    <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
      //</bean>
        @Resource
        public void setSqlSessionFactory(SqlSessionFactory sqlSessionFactory) {
            // TODO Auto-generated method stub
            super.setSqlSessionFactory(sqlSessionFactory);
        }
    }
    复制代码

    UserService.java

    复制代码
    @Service
    public class UserService{
        
        @Resource
        private UserDao userDao;
        
        public User getUserss(int id) {
            return userDao.getUser(1);
        }
    }
    复制代码
    复制代码
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  • 原文地址:https://www.cnblogs.com/a8457013/p/8068263.html
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