mybatis與spring整合框架搭建

 

目錄

整合思路

導包

log4j.properties

db.properties

SqlMapConfig.xml

SpringContext.xml

po對象

mybatis使用原始dao開發

mybatis使用mapper（動態代理）方式開發

測試

---

整合思路

1. SqlSessionFactory對象應該放到spring容器中作爲單例存在。
2. 傳統dao的開發方式中，應該從spring容器中獲得sqlsession對象。
3. Mapper代理形式中，應該從spring容器中直接獲得mapper的代理對象。
4. 數據庫的連接以及數據庫連接池事務管理都交給spring容器來完成。

導包

• spring的jar包
• Mybatis的jar包
• Spring+mybatis的整合包。
• Mysql的數據庫驅動jar包。
• 數據庫連接池的jar包。

log4j.properties

# Global logging configuration
log4j.rootLogger=DEBUG, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

db.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf-8
jdbc.username=root
jdbc.password=123

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>
  <!--設置別名  -->
  <typeAliases>
     <package name="com.lws.po"/>
  </typeAliases>
  
  <!-- mapper開發  -->
  <mappers>
          <package name="com.lws.user.mapper"/>
  </mappers>
</configuration>

SpringContext.xml

配置mybatis與spring

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:p="http://www.springframework.org/schema/p"
	xmlns:aop="http://www.springframework.org/schema/aop"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
	http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
	http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
	http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd">
	<!--加載配置文件 -->
	<context:property-placeholder location="classpath:db.properties"/>
	
	<!-- 數據庫連接池配置 commons-dbcp-1.2.2.jar 包下-->
     <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>
	
	<!-- mybatis工廠 -->
	<bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
	   <property name="dataSource" ref="dataSource"></property>
	   <property name="configLocation" value="classpath:SqlMapConfig.xml"></property> <!-- 核心配置文件位置 -->
	</bean>
		
	<!-- Dao原始Dao -->
	<bean id="userDao" class="com.lws.user.dao.UserDaoImpl">
		<property name="sqlSessionFactory" ref="sqlSessionFactoryBean"/>
	</bean>
	<!-- Mapper動態代理開發 -->
	<bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
		<property name="sqlSessionFactory" ref="sqlSessionFactoryBean"/>
		<property name="mapperInterface" value="com.lws.user.mapper.UserMapper"/>
	</bean>
	
	<!-- Mapper動態代理開發(增強版、企業常用)   掃描mybatis-spring-1.2.2.jar -->
	<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
		<!-- 基本包 -->
		<property name="basePackage" value="com.lws.**.mapper"/>
	</bean>
	
</beans>

po對象

mybatis使用原始dao開發

public interface UserDao {
public void insertUser();
}

public class UserDaoImpl extends SqlSessionDaoSupport implements UserDao{

	@Override
	public void insertUser() {
		// TODO Auto-generated method stub
		//this.getSqlSession().insert(arg0, arg1);
	}

}

mybatis使用mapper（動態代理）方式開發

public interface UserMapper {

	User queryUserById(int id);

}

<?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.lws.user.mapper.UserMapper">
	<select id="queryUserById" parameterType="Integer" resultType="User">
	select * from user where id=#{v}
	</select>
</mapper>

測試

public class MyTest {
	private ApplicationContext context;
 /**
  * mapper開發測試
  */
	@Before
	public void init() {
		context=new ClassPathXmlApplicationContext("SpringContext.xml");
	}
   /**
    * mapper開發
    */
	@Test
	public void testQueryUserById() {
		// 獲取Mapper
		UserMapper userMapper = (UserMapper)context.getBean("userMapper");
		User user = userMapper.queryUserById(10);
		System.out.println(user);
	}
	/**
	 * mapper開發增強版、企業常用
	 */
	@Test
	public void testQueryUserById2() {
		// 獲取Mapper
		UserMapper userMapper = (UserMapper)context.getBean(UserMapper.class);
		User user = userMapper.queryUserById(10);
		System.out.println(user);
	}
}