环境描述:
mybatis的jar包:mybatis-3.1.1.jar(mybatis自身功能包),mybatis-spring-1.1.1.jar(mybatis和spring的整合包)
c3p0的jar包:c3p0-0.9.1.jar。
首先配置好mybatis的*Mapper.xml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="org.jston.sql.interfaces.EasyMapper"> <resultMap id="Easymap" type="org.jston.entity.Easy"> <!--id映射 --> <id property="eid" column="eid" /> <!--普通属性映射 --> <result property="ename" column="ename" /> <result property="epassword" column="epassword" /> </resultMap> <select id="getById" parameterType="int" resultMap="Easymap"> select * from Easy where eid = #{id} </select> </mapper>
上述代码描述了一张表映射到mybatis中的基本结构,resultMap节点的type属性是数据库表所对应的实体类,<id>节点则是描述数据库作为标识列映射到Java实体类对应的字段。<result>则是一般字段。<select />顾名思义,是配置一个查询。
Java实体类如下:
package org.jston.entity; public class Easy { private Integer eid; private String ename; private String epassword; public Integer getEid() { return eid; } public void setEid(Integer eid) { this.eid = eid; } public String getEname() { return ename; } public void setEname(String ename) { this.ename = ename; } public String getEpassword() { return epassword; } public void setEpassword(String epassword) { this.epassword = epassword; } }
现在对mybatis的Mapper配置实体类应该Ok了,接下来就是Configration.xml了,这是mybatis的主配置文件,由于现在要将spring和mybatis整合,所以mybatis的主配置文件的意义只是用来管理mybatis的Mapper.xml文件而已,具体内容如下:
<?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> <mappers> <mapper resource="resouce/EasyMapper.xml" /> </mappers> </configuration>
只需要配置一下Mapper即可,关于datasource的配置在spring中配置。
到此mybatis的简单配置就Ok了。
下面就是配置spring的application.xml文件了
<?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: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-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd"> <!-- dataSource --> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close"> <property name="driverClass" value="com.microsoft.sqlserver.jdbc.SQLServerDriver"></property> <property name="jdbcUrl" value="jdbc:sqlserver://localhost:1433; DatabaseName=ey"></property> <property name="user" value="mybatis"></property> <property name="password" value="mybatis"></property> </bean> <!-- 使用spring的会话管理 --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="configLocation" value="classpath:Configration.xml" /> </bean> <!-- 使用spring的事务管理 --> <bean name="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"></property> </bean> <!-- 配置当出现Exception、RuntimeException、Exception时采用对应的事务操作 --> <tx:advice id="userTxAdvice" transaction-manager="transactionManager"> <tx:attributes> <tx:method name="delete*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" no-rollback-for="java.lang.RuntimeException" /> <tx:method name="insert*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.RuntimeException" /> <tx:method name="update*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" /> <tx:method name="find*" propagation="SUPPORTS" /> <tx:method name="get*" propagation="SUPPORTS" /> <tx:method name="select*" propagation="SUPPORTS" /> </tx:attributes> </tx:advice> </beans>
以上就是spring和mybatis的配置文件整合示例。
接下来就是调用Mybatis上面配置好德select语句了~
先创建一个Dao接口:
package org.jston.sql.interfaces; import org.jston.entity.Easy; public interface EasyMapper { public Easy getById(int id); }
回头看看上面的mybatis的*Mapper.xml文件就会发现,Mapper节点的type属性和现在定义的Dao接口类型一致,并且<select>节点的id和这个接口的方法名也一致,意味着等下我们可以通过调用这个接口的getById方法来调用mybatis对应的Sql语句。
main方法测试代码:
package org.jston.mybatis; import java.io.IOException; import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.session.SqlSessionFactory; import org.apache.ibatis.session.defaults.DefaultSqlSessionFactory; import org.jston.entity.Easy; import org.jston.sql.interfaces.EasyMapper; import org.springframework.context.support.ClassPathXmlApplicationContext; public class Mybatis_Test { public static void main(String[] args) throws IOException { //加载spring的配置文件 ClassPathXmlApplicationContext app = new ClassPathXmlApplicationContext( "applicationContext.xml"); //得到mybatis的SqlSessionFactory SqlSessionFactory obj = (SqlSessionFactory) app.getBean( "sqlSessionFactory", DefaultSqlSessionFactory.class); //创建mybatis的SqlSession SqlSession ses = obj.openSession(); //得到在mybatis的*Mapper.xml文件中配置好的Mapper节点 EasyMapper mapper = ses.getMapper(EasyMapper.class); //调用mybatis的Id为getById对应的Sql语句 Easy easy = mapper.getById(1); //打印输出 System.out.println(easy.getEname()); } }