spring + springmvc + mybatis整合以及一些常見問題(二)
阿新 • • 發佈:2018-12-12
- 建立entity(實體類)
- 建立dao
對資料庫進行操作 - 在main/resources中建立一個包 裡面放Mapper
<?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.yangyang.dao.UserDAO">
<!-- parameterType 引數 -->
<!-- resultType 返回值 -->
<select id="QuestALL" resultType="User">
select * from user
</select>
</mapper>
- 配置spring
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.1.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.1.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.1.xsd " >
<!-- 開啟註解掃描 --><!-- service 位置 -->
<context:component-scan base-package="com.yangyang" />
<!-- 引入小配置檔案 -->
<context:property-placeholder location="classpath:jdbc.properties" />
<!-- 建立資料來源 -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="${jdbc.drivcer}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.name}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
<!-- 建立sqlsessionFactory -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean" >
<property name="dataSource" ref="dataSource" />
<property name="typeAliasesPackage" value="com.yangyang.entity" />
<property name="mapperLocations" value="classpath:com/yangyang/mapper/*Mapper.xml" />
</bean>
<!-- 建立DAO物件 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer" >
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
<property name="basePackage" value="com.yangyang.dao" />
</bean>
<!-- 建立事務管理 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager" >
<property name="dataSource" ref="dataSource" />
</bean>
<!-- 開啟註解式事務生效 -->
<tx:annotation-driven transaction-manager="transactionManager" />
</beans>
- service(業務層)
/*註解注入service(業務層)*/
/*@transactional 新增事務*/
@Service("userService")
@Transactional
public class UserServiceIMP implements UserService {
/*自動注入*/
@Autowired
private UserDAO userDAO;
/*實現方法*/
public List<User> questALL() {
System.out.println("aaaa");
List<User> users = userDAO.QuestALL();
return users;
}
}
- 測試 Test
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:spring.xml")
public class TsstUser {
@Autowired
private UserService userService;
@Test
public void Test1(){
List<User> users = userService.questALL();
System.out.println(users);
}
}
這是spring和mybatis的整合
通常我在做這兩個整合的時候經常會出一些或大或小的問題,之後會貼在下面。