Spring+Ibatis处理1对1数据表的例子

数据库结构（mysql）




create table customerDetail(CustomerDetailId varchar(10) primary key,DataDetail varchar(10));


create table customers(id varchar(10) primary key,


firstname varchar(10),


lastname varchar(10),


customerDetail varchar(10),


customerGross varchar(10),


foreign key (customerDetail) references customerDetail(CustomerDetailId),


foreign key (customerGross) references customerDetail(CustomerDetailId));


insert into customerdetail values("1","detail1");


insert into customerdetail values("2","detail2");


insert into customerdetail values("3","detail3");


insert into customers values("1","firstname1","lastname1","1",null);


insert into customers values("2","firstname2","lastname2","2","3");




customer和customerDetail是1对1的关系


customer和customerGossIp是1对1的关系

domain对象：




package ch10.SpringAndIbatisOneToOne;




import java.util.List;






public class Customers ...{


private String customerId;


private String firstName;


private String lastName;


private CustomerDetail customerDetail;


private CustomerDetail customerGossIp;




public CustomerDetail getCustomerDetail() ...{


return customerDetail;


}




public void setCustomerDetail(CustomerDetail customerDetail) ...{


this.customerDetail = customerDetail;


}




public CustomerDetail getCustomerGossIp() ...{


return customerGossIp;


}




public void setCustomerGossIp(CustomerDetail customerGossIp) ...{


this.customerGossIp = customerGossIp;


}




public String getCustomerId() ...{


return customerId;


}




public void setCustomerId(String customerId) ...{


this.customerId = customerId;


}




public String getFirstName() ...{


return firstName;


}




public void setFirstName(String firstName) ...{


this.firstName = firstName;


}




public String getLastName() ...{


return lastName;


}




public void setLastName(String lastName) ...{


this.lastName = lastName;


}






}






package ch10.SpringAndIbatisOneToOne;






public class CustomerDetail ...{


private String customerDetailId;


private String dataDetail;




public String getCustomerDetailId() ...{


return customerDetailId;


}




public void setCustomerDetailId(String customerDetailId) ...{


this.customerDetailId = customerDetailId;


}




public String getDataDetail() ...{


return dataDetail;


}




public void setDataDetail(String dataDetail) ...{


this.dataDetail = dataDetail;


}




}





DAO接口：




package ch10.SpringAndIbatisOneToOne;




import java.util.List;






public interface IDAO ...{


public Object getCustomersById(String id);


}





DAO实现类：




package ch10.SpringAndIbatisOneToOne;




import java.util.List;




import org.springframework.orm.ibatis.support.SqlMapClientDaoSupport;






public class TestDAO extends SqlMapClientDaoSupport implements IDAO ...{






public Object getCustomersById(String id) ...{





return this.getSqlMapClientTemplate().queryForObject("getCustomerById",id);


}







}





Ibatis配置文件：




<?xml version="1.0" encoding="UTF-8"?>


<!DOCTYPE sqlMapConfig


PUBLIC "-//iBATIS.com//DTD SQL Map Config 2.0//EN"


"http://www.ibatis.com/dtd/sql-map-config-2.dtd">


<sqlMapConfig>




<sqlMap resource="ch10/SpringAndIbatisOneToOne/Ibatis.xml" />




</sqlMapConfig>



ibatis sql map文件：




<?xml version="1.0" encoding="UTF-8" ?>


<!DOCTYPE sqlMap PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN" "http://ibatis.apache.org/dtd/sql-map-2.dtd" >


<sqlMap>


<!-- 定义类的别名，以下配置中使用别名 -->


<typeAlias type="ch10.SpringAndIbatisOneToOne.Customers" alias="customer"/>


<typeAlias type="ch10.SpringAndIbatisOneToOne.CustomerDetail" alias="customerDetail"/>





<!-- 定义基本的resultMap -->


<resultMap class="customer" id="result">


<result property="customerId" column="CustomerId"/>


<result property="firstName" column="FirstName"/>


<result property="lastName" column="LastName"/>


</resultMap>





<resultMap class="customerDetail" id="gossipDetail">


<result property="customerDetailId" column="CustomerDetailId"/>


<result property="dataDetail" column="DataDetail"/>


</resultMap>








<!-- 使用如下这种集成关系的好处是我们可以只返回我们需要的数据，而不是总返回全部数据


比如我们只关心customer，而不关心他其中的customerDetail和customerGossIp,那我们之用


名为result的resultMap就可以了 -->





<!-- 定义符合resultMap,这种配置表明了customer的customerDetail不能为空，而customerGross可以为空 >-->


<resultMap class="customer" id="resultDetail" extends="result">


<result property="customerDetail.customerDetailId" column="CustomerDetailID"/>


<result property="customerDetail.dataDetail" column="DataDetail"/>


<result property="customerGossIp" column="CustomerGossIp" select="getCustomerGossById"/>


</resultMap>








<select id="getCustomerGossById" resultMap="gossipDetail" parameterClass="string">


select CustomerDetailId,DataDetail from CustomerDetail where CustomerDetailId=#value#


</select>





<!-- 根据customerid获得Customer-->







<select id="getCustomerById" resultMap="resultDetail" parameterClass="string">


select c.CustomerId as CustomerId,


c.FirstName as FirstName,


c.LastName as LastName,


c.CustomerDetail as CustomerDetail,


c.CustomerGossIp as CustomerGossIp,


cd.CustomerDetailID as CustomerDetailID,


cd.Datadetail as DataDetail


from customers c


inner join customerdetail cd on c.CustomerDetail=cd.CustomerDetailId


where c.CustomerId=#value#


</select>


</sqlMap>





spring配置文件

如果要使用1对1，1对多这样牵扯两个表的情况，一定要为SqlMapClientFactoryBean设置dataSource属性




<?xml version="1.0" encoding="UTF-8"?>


<beans


xmlns="http://www.springframework.org/schema/beans"


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-2.0.xsd">





<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">


<property name="driverClassName">


<value>com.mysql.jdbc.Driver</value>


</property>


<property name="username">


<value>root</value>


</property>


<property name="password">


<value>1234</value>


</property>


<property name="url">


<value>jdbc:mysql://localhost:3306/spring</value>


</property>


</bean>




<bean id="sqlMapClient" class="org.springframework.orm.ibatis.SqlMapClientFactoryBean">


<!-- 此处应注入ibatis配置文件，而非sqlMap文件，否则会出现“there is no statement.....异常” -->


<property name="configLocation">


<value>ch10/SpringAndIbatisOneToOne/sqlMapConfig.xml</value>


</property>


<property name="dataSource">


<ref bean="dataSource"/>


</property>




</bean>




<bean id="testDAO" class="ch10.SpringAndIbatisOneToOne.TestDAO">


<property name="dataSource">


<ref bean="dataSource"/>


</property>


<property name="sqlMapClient">


<ref bean="sqlMapClient"/>


</property>


</bean>




</beans>



测试代码：




package ch10.SpringAndIbatisOneToOne;




import java.util.ArrayList;


import java.util.Iterator;


import java.util.List;




import org.springframework.context.ApplicationContext;


import org.springframework.context.support.ClassPathXmlApplicationContext;




import ch10.SpringAndIbatis.Ibatis;






public class Test ...{






/** *//**


* @param args


*/




public static void main(String[] args) ...{


ApplicationContext context=new ClassPathXmlApplicationContext("ch10/SpringAndIbatisOneToOne/applicationContext.xml");


TestDAO testDAOImpl=(TestDAO)context.getBean("testDAO");




Customers result1=(Customers)testDAOImpl.getCustomersById("1");





Customers result2=(Customers)testDAOImpl.getCustomersById("2");











System.out.println(result1.getFirstName()+"-"+result1.getLastName()+"-"+result1.getCustomerDetail().getDataDetail()+"-"+result1.getCustomerGossIp().getDataDetail());





System.out.println("-----------------");





System.out.println(result2.getFirstName()+"-"+result2.getLastName()+"-"+result2.getCustomerDetail().getDataDetail()+"-"+result2.getCustomerGossIp().getDataDetail());





}




}





结果：

firstname1-lastname1-detail1-detail2
-----------------
firstname2-lastname2-detail2-detail3