MyBatis与Spring集成
Spring2只支持iBatis2,Spring3是不支持MyBatis3的,所以MyBatis自开发了一个集成Spring框架的项目MyBatis-Spring。该项目集成Spring,可以将事务交给Spring进行管理,同时将mapper类、sqlSession注入到其它类中。
项目地址:https://github.com/mybatis/spring
官方帮助文档(英文):http://mybatis.github.io/spring/index.html
官方帮助文档(中文):http://mybatis.github.io/spring/zh/index.html
MyBatis进行数据处理的核心是SqlSession,SqlSession又通过SqlSessionFactory产生,在MyBatis 中SqlSessionFactory由SqlSessionFactoryBuilder创建,与Spring集成后通过 SqlSessionFactoryBean产生。SqlSession的创建方式有两种:一种是通过SqlSessionTemplate创建,还有一 种是通过继承SqlSessionDaoSupport后调用getSqlSession方法获得。其实还有一种隐式的创建方式是通过自动扫描 Mapper类,然后框架会自动注入SqlSession。
具体的配置方式如下:
(1)spring-mybatis.xml:集成的配置,三种方式选择一种即可。
<?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:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <context:component-scan base-package="com.research.mybatis"></context:component-scan> <!-- 创建SqlSessionFactory,同时指定数据源 --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="configLocation" value="classpath:generator/spring/spring-mybatis-config.xml"></property> </bean> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName" value="com.mysql.jdbc.Driver" /> <property name="url" value="jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8&generateSimpleParameterMetadata=true" /> <property name="username" value="root" /> <property name="password" value="root" /> </bean> <!-- 方式1、使用继承SqlSessionDaoSupport方式 --> <bean id="mybatisSpringDaoUseDaoSupport" class="com.research.mybatis.spring.MybatisSpringDaoUseDaoSupport"> <property name="sqlSessionFactory" ref="sqlSessionFactory" /> </bean> <!-- 方式2、使用sqlSessionTemplate方式 --> <bean id="mybatisSpringDaoUseTemplate" class="com.research.mybatis.spring.MybatisSpringDaoUseTemplate"> <property name="sqlSession" ref="sqlSession"></property> </bean> <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate"> <constructor-arg ref="sqlSessionFactory"></constructor-arg> </bean> <!-- 方式3、使用扫描Mapper类的方式 --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="sqlSessionFactory" ref="sqlSessionFactory"></property> <property name="basePackage" value="com.research.mybatis.generator.dao"></property> </bean> </beans>
(2)spring-mybatis-config.xml:这个是MyBatis相关的配置,不需要配置太多,因为集成的时候环境配置、数据源配置、事务配置都交给Spring去管理了。
<?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> <typeAlias alias="AgentInvokeGenerate" type="com.research.mybatis.generator.model.AgentInvokeGenerate"/> </typeAliases> <mappers> <mapper resource="generator/mapper/AgentInvokeGenerateMapper.xml"></mapper> </mappers> </configuration>
(3)AgentInvokeGenerateMapper.xml:具体Sql
<?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.research.mybatis.generator.dao.AgentInvokeGenerateMapper"> <resultMap id="BaseResultMap" type="com.research.mybatis.generator.model.AgentInvokeGenerate"> <id column="ID" jdbcType="CHAR" property="ID" /> <result column="DB_FLAG" jdbcType="VARCHAR" property="dbFlag" /> <result column="STATUS" jdbcType="CHAR" property="STATUS" /> </resultMap> <select id="selectByPrimaryKey" parameterType="java.lang.String" resultMap="BaseResultMap"> select <include refid="Base_Column_List" /> from agent_info where ID = #{ID,jdbcType=CHAR} </select> </mapper>
具体调用的代码如下:
(1)使用SqlSessionTemplate方式:
package com.research.mybatis.spring; import org.apache.ibatis.session.SqlSession; import com.research.mybatis.generator.model.AgentInvokeGenerate; public class MybatisSpringDaoUseTemplate { private SqlSession sqlSession; public AgentInvokeGenerate getAgentInvokeById(String id){ return sqlSession.selectOne("com.research.mybatis.generator.dao.AgentInvokeGenerateMapper.selectByPrimaryKey", id); } public SqlSession getSqlSession() { return sqlSession; } public void setSqlSession(SqlSession sqlSession) { this.sqlSession = sqlSession; } }
(2)使用SqlSessionDaoSupport方式:
package com.research.mybatis.spring; import org.mybatis.spring.support.SqlSessionDaoSupport; import org.springframework.stereotype.Repository; import com.research.mybatis.generator.model.AgentInvokeGenerate; @Repository public class MybatisSpringDaoUseDaoSupport extends SqlSessionDaoSupport{ public AgentInvokeGenerate getAgentInvokeById(String id){ return getSqlSession().selectOne("com.research.mybatis.generator.dao.AgentInvokeGenerateMapper.selectByPrimaryKey", id); } }
(3)使用Mapper方式:
package com.research.mybatis.spring; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Repository; import com.research.mybatis.generator.dao.AgentInvokeGenerateMapper; import com.research.mybatis.generator.model.AgentInvokeGenerate; @Repository public class MybatisSpringDaoUseMapper { @Autowired private AgentInvokeGenerateMapper mapper; public AgentInvokeGenerate getAgentInvokeById(String id){ return mapper.selectByPrimaryKey(id); } }
相关实体类和Mapper类:
package com.research.mybatis.generator.model; public class AgentInvokeGenerate { private String ID; private String dbFlag; private String STATUS; public String getID() { return ID; } public void setID(String ID) { this.ID = ID == null ? null : ID.trim(); } public String getDbFlag() { return dbFlag; } public void setDbFlag(String dbFlag) { this.dbFlag = dbFlag == null ? null : dbFlag.trim(); } public String getSTATUS() { return STATUS; } public void setSTATUS(String STATUS) { this.STATUS = STATUS == null ? null : STATUS.trim(); } }
package com.research.mybatis.generator.dao; import com.research.mybatis.generator.model.AgentInvokeGenerate; public interface AgentInvokeGenerateMapper { AgentInvokeGenerate selectByPrimaryKey(String ID); }
具体测试类如下(使用TestNG):
(1)使用SqlSessionTemplate方式的测试类:
package com.research.mybatis.spring; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.testng.AbstractTestNGSpringContextTests; import org.testng.Assert; import org.testng.annotations.Test; import com.research.mybatis.generator.model.AgentInvokeGenerate; @ContextConfiguration(locations="classpath:/generator/spring/spring-mybatis.xml") public class MybatisSpringDaoUseTemplateTest extends AbstractTestNGSpringContextTests{ @Autowired private MybatisSpringDaoUseTemplate dao; @Test public void getAgentInvokeById() { String id = "001"; AgentInvokeGenerate ai = dao.getAgentInvokeById(id); Assert.assertTrue("000".equals(ai.getDbFlag())); } }
(2)使用SqlSessionDaoSupport方式的测试类:
package com.research.mybatis.spring; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.testng.AbstractTestNGSpringContextTests; import org.testng.Assert; import org.testng.annotations.Test; import com.research.mybatis.generator.model.AgentInvokeGenerate; @ContextConfiguration(locations="classpath:/generator/spring/spring-mybatis.xml") public class MybatisSpringDaoUseDaoSupportTest extends AbstractTestNGSpringContextTests{ @Autowired private MybatisSpringDaoUseDaoSupport dao; @Test public void getAgentInvokeById() { String id = "001"; AgentInvokeGenerate ai = dao.getAgentInvokeById(id); Assert.assertTrue("000".equals(ai.getDbFlag())); } }
(3)使用Mapper方式的测试类:
package com.research.mybatis.spring; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.testng.AbstractTestNGSpringContextTests; import org.testng.Assert; import org.testng.annotations.Test; import com.research.mybatis.generator.model.AgentInvokeGenerate; @ContextConfiguration(locations="classpath:/generator/spring/spring-mybatis.xml") public class MybatisSpringDaoUseMapperTest extends AbstractTestNGSpringContextTests{ @Autowired private MybatisSpringDaoUseMapper dao; @Test public void getAgentInvokeById() { String id = "001"; AgentInvokeGenerate ai = dao.getAgentInvokeById(id); Assert.assertTrue("000".equals(ai.getDbFlag())); } }
代码测试通过,若用博文中代码时需注意下文件和包路径是否正确,更多集成相关的细节参考官方帮助文档。
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