Spring與Mybatis的整合,主要包括兩個方面,一是將Mybatis的會話工廠交由Spring進行創建管理,二是將mapper接口交由Spring統一管理。
接下來通過項目進行說明。
新建java工程,項目結構如下:
數據庫資源配置文件不再敘述,在之前的mybatis文章中已經多次提及,本項目從數據庫的連接至接口的開發進行講解。
本項目通過一個數據查詢案例進行講解。
1、編寫po類
package com.bs.po;
/*
*@Author swxctx
*@time 2017年4月25日
*@Explain:數據表po對象
*字段:
*/
public class Data {
private int num;
private String temp;
private String co;
public int getNum() {
return num;
}
public void setNum(int num) {
this.num = num;
}
public String getTemp() {
return temp;
}
public void setTemp(String temp) {
this.temp = temp;
}
public String getCo() {
return co;
}
public void setCo(String co) {
this.co = co;
}
}
2、編寫mybatis配置文件SqlMapConfig.xml,與Spring結合時,配置文件其實只需要對mybatis進行一些設置即可。
<?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>
<package name="com.bs.po"/>
</typeAliases>
<!-- 加載mapper -->
<mappers>
<package name="com.bs.mapper"/>
</mappers>
</configuration>
3、編寫mapper接口
package com.bs.mapper;
/*
*@Author swxctx
*@time 2017年3月14日
*@Explain:
*/
import com.bs.po.Data;
public interface DataMapper{
//根據num查詢數據信息
public Data findDataByNum(int num)throws Exception;
}
4、編寫mapper.xml配置文件
<?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.bs.mapper.DataMapper">
<!-- 根據num查詢數據信息 -->
<select id="findDataByNum" parameterType="int" resultType="com.bs.po.Data">
select *from Data where num=#{num}
</select>
</mapper>
5、編寫Spring配置文件applicationContext.xml,此配置文件主要配置數據庫連接相關信息以及mapper接口
<?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: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"/>
<!-- 數據庫連接池 -->
<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>
<!-- mapper配置 -->
<!-- 讓spring管理sqlsessionfactory 使用mybatis-spring.jar -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 數據庫連接池 -->
<property name="dataSource" ref="dataSource" />
<!-- 加載mybatis的全局配置文件 -->
<property name="configLocation" value="classpath:mybatis/SqlMapConfig.xml" />
</bean>
<!-- mapper配置(單個加載) -->
<!-- <bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
指定mapper接口
<property name="mapperInterface" value="com.bs.mapper.UserMapper"></property>
<property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
</bean> -->
<!-- mapper掃描(自動掃描) -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- 掃描的包名 -->
<property name="basePackage" value="com.bs.mapper"></property>
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
</bean>
</beans>
6、在上面,配置已經完成,接下來可以測試了
public class DaoUserTest {
private ApplicationContext applicationContext;
@Before
public void setUp() throws Exception {
//得到spring容器
applicationContext = new ClassPathXmlApplicationContext("config/spring/applicationContext.xml");
}
@Test
public void testFindDataByNum() throws Exception{
DataMapper dataMapper = (DataMapper)applicationContext.getBean("dataMapper");
Data data = dataMapper.findDataByNum(1);
System.out.println(data.getTemp());
}
}
結果如下所示: