原文链接:http://www.cnblogs.com/wangmingshun/p/5674633.html
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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;} }
UserDao.java
@Repository public class UserDao{@Resourceprivate SqlSessionTemplate sqlSessionTemplate;public User getUser(int id) {return sqlSessionTemplate.selectOne(this.getClass().getName() + ".getUser", 1);} }
UserService.java
@Service public class UserService{@Resourceprivate 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
<?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>
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;} }
UserDao.java
@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> @Resourcepublic void setSqlSessionFactory(SqlSessionFactory sqlSessionFactory) {// TODO Auto-generated method stubsuper.setSqlSessionFactory(sqlSessionFactory);} }
UserService.java
@Service public class UserService{@Resourceprivate UserDao userDao;public User getUserss(int id) {return userDao.getUser(1);} }