在之前的文章中总结了三种方式,但是有两种是注解sql的,这种方式比较混乱所以大家不怎么使用,下面总结一下常用的两种总结方式:
一、 动态代理实现 不用写dao的实现类
这种方式比较简单,不用实现dao层,只需要定义接口就可以了,这里只是为了记录配置文件所以程序写的很简单:
1、整体结构图:
2、三个配置文件以及一个映射文件
(1)、程序入口以及前端控制器配置 web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <display-name>website1</display-name> <!-- 设置监听,在web容器启动时自动装配ApplicationContext的配置信息--> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <!-- 设置Spring容器加载配置文件路径 --> <context-param> <param-name>contextConfigLocation</param-name> <param-value> classpath:config/springmvc-servlet.xml, classpath:config/ApplicationContext.xml </param-value> </context-param> <!-- 字符编码过滤器 --> <filter> <filter-name>encodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>utf-8</param-value> </init-param> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>encodingFilter</filter-name> <url-pattern>*.do</url-pattern> </filter-mapping> <!-- 前端控制器 --> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:config/springmvc-servlet.xml</param-value> </init-param> <!-- 这个配置文件在容器启动的时候 就加载 --> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <!-- 拦截请求 --> <url-pattern>*.do</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> </web-app>
<?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:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:util="http://www.springframework.org/schema/util" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:cache="http://www.springframework.org/schema/cache" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-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-3.1.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.1.xsd http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache-3.1.xsd"> <!-- 注解驱动 --> <mvc:annotation-driven /> <!-- <context:annotation-config /> --> <!-- context:component-scan 具有annotation-config 的功能 --> <!-- 扫描 控制层 --> <context:component-scan base-package="com.website.controller"></context:component-scan> <!-- 视图解析器 --> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/view/"> </property> <property name="suffix" value=".jsp"></property> </bean> </beans>
这里会有多中配置文件
1)、单数据源,动态代理实现dao层接口时不设置sqlSessionFactoryBeanName、或sqlSessionTemplateBeanName 两个属性的值
<?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:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd"> <!-- 加载配置JDBC文件 --> <context:property-placeholder location="classpath:db.properties" /> <!-- 数据源 --> <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName"> <value>${jdbc.driverClassName}</value> </property> <property name="url"> <value>${jdbc.url}</value> </property> <property name="username"> <value>${jdbc.username}</value> </property> <property name="password"> <value>${jdbc.password}</value> </property> </bean> <!-- 开启注解配置 即Autowried --> <!-- <context:annotation-config/> --> <!--其实component-scan 就有了annotation-config的功能即把需要的类注册到了spring容器中 --> <context:component-scan base-package="com.website.service" /> <!-- 在使用mybatis时 spring使用sqlsessionFactoryBean 来管理mybatis的sqlsessionFactory --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <!-- mybatis配置文件路径 --> <property name="configLocation" value="" /> <!-- 实体类映射文件路径,这里只有一个就写死了,多个可以使用mybatis/*.xml来替代 --> <property name="mapperLocations" value="classpath:mybatis/userMapper.xml" /> </bean> <!-- <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate"> <constructor-arg index="0"> <ref bean="sqlSessionFactory"/> </constructor-arg> </bean> --> <!--动态代理实现 不用写dao的实现 --> <bean id="MapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <!-- 这里的basePackage 指定了dao层接口路劲,这里的dao接口不用自己实现 --> <property name="basePackage" value="com.website.dao" /> <!-- 如果只有一个数据源的话可以不用指定,但是如果有多个数据源的话必须要指定 --> <!-- <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" /> --> <!--直接指定了sqlsessionTemplate名称,这个和上面的其实是一样的 --> <!-- <property name="sqlSessionTemplateBeanName" value="sqlSession" /> --> </bean> <!--事务管理器 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource" /> </bean> <!-- 使用全注释事务 --> <tx:annotation-driven transaction-manager="transactionManager" /> </beans>
<?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:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd"> <!-- 加载配置JDBC文件 --> <context:property-placeholder location="classpath:db.properties" /> <!-- 数据源 --> <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName"> <value>${jdbc.driverClassName}</value> </property> <property name="url"> <value>${jdbc.url}</value> </property> <property name="username"> <value>${jdbc.username}</value> </property> <property name="password"> <value>${jdbc.password}</value> </property> </bean> <!-- 开启注解配置 即Autowried --> <!-- <context:annotation-config/> --> <!--其实component-scan 就有了annotation-config的功能即把需要的类注册到了spring容器中 --> <context:component-scan base-package="com.website.service" /> <!-- 在使用mybatis时 spring使用sqlsessionFactoryBean 来管理mybatis的sqlsessionFactory --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <!-- mybatis配置文件路径 --> <property name="configLocation" value="" /> <!-- 实体类映射文件路径,这里只有一个就写死了,多个可以使用mybatis/*.xml来替代 --> <property name="mapperLocations" value="classpath:mybatis/userMapper.xml" /> </bean> <!-- <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate"> <constructor-arg index="0"> <ref bean="sqlSessionFactory"/> </constructor-arg> </bean> --> <!--动态代理实现 不用写dao的实现 --> <bean id="MapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <!-- 这里的basePackage 指定了dao层接口路劲,这里的dao接口不用自己实现 --> <property name="basePackage" value="com.website.dao" /> <!-- 如果只有一个数据源的话可以不用指定,但是如果有多个数据源的话必须要指定 --> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" /> <!--直接制定了sqlsessionTemplate名称,这个和上面的其实是一样的 --> <!-- <property name="sqlSessionTemplateBeanName" value="sqlSession" /> --> </bean> <!--事务管理器 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource" /> </bean> <!-- 使用全注释事务 --> <tx:annotation-driven transaction-manager="transactionManager" /> </beans>
<?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:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd"> <!-- 加载配置JDBC文件 --> <context:property-placeholder location="classpath:db.properties" /> <!-- 数据源 --> <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName"> <value>${jdbc.driverClassName}</value> </property> <property name="url"> <value>${jdbc.url}</value> </property> <property name="username"> <value>${jdbc.username}</value> </property> <property name="password"> <value>${jdbc.password}</value> </property> </bean> <!-- 开启注解配置 即Autowried --> <!-- <context:annotation-config/> --> <!--其实component-scan 就有了annotation-config的功能即把需要的类注册到了spring容器中 --> <context:component-scan base-package="com.website.service" /> <!-- 在使用mybatis时 spring使用sqlsessionFactoryBean 来管理mybatis的sqlsessionFactory --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <!-- mybatis配置文件路径 --> <property name="configLocation" value="" /> <!-- 实体类映射文件路径,这里只有一个就写死了,多个可以使用mybatis/*.xml来替代 --> <property name="mapperLocations" value="classpath:mybatis/userMapper.xml" /> </bean> <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate"> <constructor-arg index="0"> <ref bean="sqlSessionFactory" /> </constructor-arg> </bean> <!--动态代理实现 不用写dao的实现 --> <bean id="MapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <!-- 这里的basePackage 指定了dao层接口路劲,这里的dao接口不用自己实现 --> <property name="basePackage" value="com.website.dao" /> <!-- 如果只有一个数据源的话可以不用指定,但是如果有多个数据源的话必须要指定 --> <!-- <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" /> --> <!--直接制定了sqlsessionTemplate名称,这个和上面的其实是一样的 --> <property name="sqlSessionTemplateBeanName" value="sqlSession" /> </bean> <!--事务管理器 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource" /> </bean> <!-- 使用全注释事务 --> <tx:annotation-driven transaction-manager="transactionManager" /> </beans>
注意如果是多数据源则一定要使用sqlSessionFactoryBeanName 或sqlSessionTemplateBeanName 来指定具体的数据源,不知道在上面的配置中有没有注意到,如果使用sqlSessionTemplateBeanName 的话要
<bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate"> <constructor-arg index="0"> <ref bean="sqlSessionFactory" /> </constructor-arg> </bean>
(4)、mybatis SQL映射文件 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"> <!-- namespace的值就是dao接口的完整路劲,就这个demo而言namespace 就是userDao.java的完整路劲 --> <mapper namespace="com.website.dao.UserDao"> <!-- 这里的id就是接口中方法的名称 --> <insert id="saveUser" parameterType="java.util.Map"> insert into user(id,name) values(#{id},#{name}) </insert> </mapper>
3、controller层
package com.website.controller; import java.util.HashMap; import java.util.Map; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import com.website.service.UserService; @Controller @RequestMapping(value = "/user") public class UserController { // 注入userService 对象 @Autowired private UserService userService; @RequestMapping(value = "/save.do", method = RequestMethod.GET) public String saveUser(HttpServletRequest request, HttpServletResponse response) { String id = request.getParameter("id"); String name = request.getParameter("name"); Map<String, String> map = new HashMap<String, String>(); map.put("id", id); map.put("name", name); userService.saveUser(map); return "index"; } }
package com.website.service; import java.util.Map; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Transactional; import com.website.dao.UserDao; @Service("userService") @Transactional public class UserService { // 注入dao接口实现类实例 // @Resource、@Autowired两种注入方式都可以 @Autowired private UserDao userDao; public void saveUser(Map<String, String> map) { int end = userDao.saveUser(map); System.out.println("end:" + end); } }
package com.website.dao; import java.util.Map; //com.website.dao.UserDao public interface UserDao { int saveUser(Map<String, String> map); }dao 接口的完整路劲就是这个dao 接口对应的那个映射文件的namespace 而方法名就是 id的值
ok到这里这种配置方式都完了,也有了一个完整的小demo,下面我们简单总结一下:
这种配置方式相比之前的配置方式(下面也会写出来)特别之处就是他使用了dao层接口的动态代理方式实现了,之前我们会在dao层自己手动实现dao层然后自动注入SqlSessionTemplate 实例来调用具体的方法 比如 insert("","") selectOne("","") 等方法 其中第一个参数就是映射文件的地址: namespace+id 而第二个参数就是传递的条件这样mybatis 就会按照我们传递的这两个参数找到具体的映射文件进行解析查询。而这里使用动态代理就省去了我们实现dao接口的这一步骤,而是由spring提我们实现了,那有个问题,查询条件参数我们传递了,但映射文件的具体路径即:namespce+id 没有传递怎么办,那就是你的映射文件的namespace 必须是接口的类全名称而id 必须是接口中的方法名称,这样动态代理就能找到路劲了也有了参数了。 这样一来是不是觉得就一样了啊哈哈哈!
二、手动实现dao层接口
下面先来看看手动实现dao层的配置以及代码:
1、正题结构图
2、三个配置文件以及映射文件
(1)、程序入口,前端控制器配置 web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <display-name>website2</display-name> <!-- 加载spring容器配置 --> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <!-- 设置Spring容器加载配置文件路径 --> <context-param> <param-name>contextConfigLocation</param-name> <param-value> classpath:config/springmvc-servlet.xml, classpath:config/ApplicationContext.xml </param-value> </context-param> <!-- 字符编码过滤器 --> <filter> <filter-name>encodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>utf-8</param-value> </init-param> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>encodingFilter</filter-name> <url-pattern>*.do</url-pattern> </filter-mapping> <!-- 前端控制器 --> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:config/springmvc-servlet.xml</param-value> </init-param> <!-- 这个配置文件在容器启动的时候 就加载 --> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <!-- 拦截请求 --> <url-pattern>*.do</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> </web-app>
<?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:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:util="http://www.springframework.org/schema/util" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:cache="http://www.springframework.org/schema/cache" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-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-3.1.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.1.xsd http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache-3.1.xsd"> <!-- 注解驱动 --> <mvc:annotation-driven /> <!-- <context:annotation-config /> --> <!-- 扫描 --> <context:component-scan base-package="com.website.controller"></context:component-scan> <!-- 视图解析器 --> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/view/"> </property> <property name="suffix" value=".jsp"></property> </bean> </beans>
<?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:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd"> <!-- 加载配置JDBC文件 --> <context:property-placeholder location="classpath:db.properties" /> <!-- 数据源 --> <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName"> <value>${jdbc.driverClassName}</value> </property> <property name="url"> <value>${jdbc.url}</value> </property> <property name="username"> <value>${jdbc.username}</value> </property> <property name="password"> <value>${jdbc.password}</value> </property> </bean> <!-- 开启注解配置 即Autowried --> <!--component-scan拥有 annotation-config的功能即注入需要的类到spring容器中 --> <!--<context:annotation-config/> --> <!--使用自动注入的时候要 添加他来扫描bean之后才能在使用的时候 --> <context:component-scan base-package="com.website.service ,com.website.dao" /> <!-- 在使用mybatis时 spring使用sqlsessionFactoryBean 来管理mybatis的sqlsessionFactory --> <!-- 而像这种使用接口实现的方式 是使用sqlsessionTemplate来进行操作的,他提供了一些方法 --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <!-- mybatis配置文件路径 --> <property name="configLocation" value="" /> <!-- 实体类映射文件路径,在开发中映射文件肯定是多个所以使用mybatis/*.xml来替代 --> <property name="mapperLocations" value="classpath:mybatis/UserMapping.xml" /> </bean> <!--其实这里类的实例就是mybatis中SQLSession --> <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate"> <constructor-arg index="0"> <ref bean="sqlSessionFactory" /> </constructor-arg> </bean> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource" /> </bean> <!--使用全注释事务 --> <tx:annotation-driven transaction-manager="transactionManager" /> </beans>
<?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"> <!--这个namespace + 下面的id 就是一个完整的路径,在dao层我们写了完整的路径之后mybatis就是映射这个文件中的相关sql语句 --> <mapper namespace="com.website.userMapper"> <!-- parameterType就是你接受的参数的类型, --> <!-- 添加用户信息 --> <insert id="insertUser" parameterType="java.util.Map"> insert into user(id,name,password) values(#{id},#{name},#{password}) </insert> </mapper>
你可能看到了这里的映射文件的namespace +id 是自定义的而不是dao 层接口的全类名+id
3、控制层Controllerpackage com.website.controller; import java.util.HashMap; import java.util.Map; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import com.website.service.UserService; /** * @author WHD data 2016年6月5日 */ @Controller @RequestMapping(value = "/user") public class UserController { @Autowired private UserService userService; @RequestMapping(value = "/save.do") public String saveUser(HttpServletRequest request, HttpServletResponse response) { String id = request.getParameter("id"); String name = request.getParameter("name"); String password = request.getParameter("password"); Map<String, String> map = new HashMap<String, String>(); map.put("id", id); map.put("name", name); map.put("password", password); userService.saveUser(map); return "index"; } }
package com.website.service; import java.util.Map; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Transactional; import com.website.dao.UserDao; /** * @author WHD data 2016年6月5日 */ @Service("userService") @Transactional public class UserService { @Autowired private UserDao userDao; public void saveUser(Map<String, String> map) { userDao.saveUser(map); } }
package com.website.dao; import java.util.Map; import org.mybatis.spring.SqlSessionTemplate; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Repository; /** * @author WHD data 2016年6月5日 */ @Repository("userDao") public class UserDao { @Autowired private SqlSessionTemplate sqlSession; public void saveUser(Map<String, String> map) { int end = sqlSession.insert("com.website.userMapper.insertUser", map); System.out.println("end" + end); } }
这里我们没有看到有讲解属性,只是简单了一个配置小demo 在写这篇文章的时候看到了一片文章对这两种配置有详细的讲解所以下一片我会转载这篇文章,对这两种配置有不明白的可以看下面一片文章!