整合思路
需要spring通過單利方式管理sqlSessionFactory
spring和mybatis整合生成代理對象，使用sqlSessionFactory創建sqlsession（自動完成）
持久層mapper需要有spring進行管理
創建新工程
jar包：
mybatis3.2.7
spring3.2.0
mybatis-spring-1.2.2（mybatis和spring的整合包）
工程結構
Spring配置文件：
在classpath下創建applicationContext.xml，定義數據庫鏈接池、SqlSessionFactory
applicationContext.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
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-3.2.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-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/aop
http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.2.xsd ">
<!-- 加載配置文件 -->
<context:property-placeholder location="classpath:db.properties" />
<!-- 數據源，使用dbcp
maxIdle，最大空閑數，數據庫連接的最大空閑時間。超過空閑時間，數據庫連
接將被標記為不可用，然后被釋放。設為0表示無限制。
MaxActive，連接池的最大數據庫連接數。設為0表示無限制。
maxWait ，最大建立連接等待時間。如果超過此時間將接到異常。設為-1表示
無限制
-->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="${jdbc.driver}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
<property name="maxActive" value="10"/>
<property name="maxIdle" value="5"/>
</bean>
<!-- sqlSessionFactory
在mybatis和spring的整合包中
-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 加載mybatis的配置文件 -->
<property name="configLocation" value="mybatis/SqlMapConfig.xml"/>
<!-- 數據源 -->
<property name="dataSource" ref="dataSource"/>
</bean>
<!-- 原始dao開發方法 -->
<bean id="userDao" class="cn.ztc.ssm.dao.UserDaoImpl">
<property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
</bean>
</beans>```
Mybatis配置文件
在classpath下創建mybatis/SqlMapConfig.xml
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>
<settings>
<setting name="lazyLoadingEnabled" value="true"/>
<setting name="aggressiveLazyLoading" value="false"/>
<setting name="cacheEnabled" value="true"/>
</settings>
<typeAliases>
<!-- 批量別名的定義（常用）
name:指定包名，Mybatis會自動掃描包中的po類。自動定義別名，別名就是類名，首字母大寫小寫都可
-->
<package name="cn.ztc.ssm.po"/>
</typeAliases>
<!-- 加載映射文件 -->
<mappers>
<mapper resource="sqlmap/User.xml"/>
<!-- 批量加載
name:mapper接口的包名
-->
<package name="cn.ztc.ssm.mapper"/>
</mappers>
</configuration>
原始的Dao開發
Dao接口實現類繼承SqlSessionDaoSupport
使用此種方法即原始dao開發方法，需要編寫dao接口，dao接口實現類、映射文件
User.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">
<mapper namespace="test">
<select id="findUserById" parameterType="int" resultType="cn.ztc.ssm.po.User">
select * from user where id = #{id}
</select>
</mapper>
UserDao.java
package cn.ztc.ssm.dao;
import cn.ztc.ssm.po.*;
public interface UserDao {
//根據id查用戶信息
public User findUserById(int id) throws Exception;
}
UserDaoImpl.java
package cn.ztc.ssm.dao;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.support.SqlSessionDaoSupport;
import cn.ztc.ssm.po.*;
public class UserDaoImpl extends SqlSessionDaoSupport implements UserDao{
@Override
public User findUserById(int id) throws Exception {
//繼承了SqlSessionDaoSupport，通過getSqlSession();方法得到sqlSession
SqlSession sqlSession = this.getSqlSession();
User user = sqlSession.selectOne("test.findUserById", id);
//方法結束，自動關閉sqlSession
//sqlSession.close();
return user;
}
}
測試類
package cn.ztc.ssm.dao;
import static org.junit.Assert.*;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import cn.ztc.ssm.po.User;
public class UserDaoImplTest {
private ApplicationContext applicationContext;
//在setUp方法中得到spring的容器
@Before
public void setUp() throws Exception{
applicationContext = new ClassPathXmlApplicationContext("classpath:spring/applicationContext.xml");
}
@Test
public void testFindUserById() throws Exception {
UserDao userDao = (UserDao) applicationContext.getBean("userDao");
User user = userDao.findUserById(1);
System.out.println(user);
}
}
mapper代理開發
UserMapper.java
package cn.ztc.ssm.mapper;
import java.util.List;
import cn.ztc.ssm.po.User;
import cn.ztc.ssm.po.UserCustom;
import cn.ztc.ssm.po.UserQueryVo;
public interface UserMapper {
//根據id查用戶信息
public User findUserById(int id) throws Exception;
}
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">
<mapper namespace="cn.ztc.ssm.mapper.UserMapper">
<select id="findUserById" parameterType="int" resultType="cn.ztc.ssm.po.User">
select * from user where id = #{id}
</select>
</mapper>
applicationContext.xml添加
<bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
<property name="mapperInterface" value="cn.ztc.ssm.mapper.UserMapper"></property>
<property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
</bean>```
測試類
package cn.ztc.ssm.mapper;
import static org.junit.Assert.*;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import cn.ztc.ssm.po.User;
public class UserMapperTest {
private ApplicationContext applicationContext;
//在setUp方法中得到spring的容器
@Before
public void setUp() throws Exception{
applicationContext = new ClassPathXmlApplicationContext("classpath:spring/applicationContext.xml");
}
@Test
public void testFindUserById() throws Exception {
UserMapper usermapper = (UserMapper) applicationContext.getBean("userMapper");
User user = usermapper.findUserById(1);
System.out.println(user);
}
}
此方法問題：要針對每個mapper配置
解決方法：applicationContext.xml中添加
<!-- mapper批量掃描，從mapper包中掃描出mapper接口，自動創建代理對象并在spring容器中注冊
自動掃描出來的mapper的bean的id為mapper類名，首字母小寫
-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- 指定掃描包名
如果掃描多個包，每個包中間使用半角逗號分隔
可刪除sqlmapconfig.xml文件中的批量掃描配置
-->
<property name="basePackage" value="cn.ztc.ssm.mapper"/>
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
</bean>
```