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在進(jìn)行dao的集成測試時(shí)候，數(shù)據(jù)清理，察看數(shù)據(jù)都是比較麻煩的事情，使用Spring-mock.jar可以幫助我們簡化著一個(gè)過程。我舉一個(gè)簡單的例子，說明一下如何使用spring-mock。

首先是po, hbm.xml, dao, daoimpl沒什么好說的：

Customer.java : package rst.spring.mock; import java.io.Serializable; /** @author Hibernate CodeGenerator */ public class Customer implements Serializable {    /** identifier field */    private Long id;    /** nullable persistent field */    private String name;    /** full constructor */    public Customer(String name) {        this.name = name;    }    /** default constructor */    public Customer() {    }    public Long getId() {        return this.id;    }    public void setId(Long id) {        this.id = id;    }    public String getName() {        return this.name;    }    public void setName(String name) {        this.name = name;    } } Customer.hbm.xml : <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-mapping PUBLIC        "-//Hibernate/Hibernate Mapping DTD//EN"        "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd"> <hibernate-mapping package="rst.spring.mock"> <class name="Customer" table="customer"> <id name="id" column="id" type="long" unsaved-value="null"> <generator class="identity"/> </id> <property name="name" column="name" type="string"/> </class> </hibernate-mapping> CustomerDAO : /* * Created on 2005-3-25 */ package rst.spring.mock; import org.springframework.dao.DataAccessException; /** * @author rst * */ public interface CustomerDAO {    public void add(Customer customer) throws DataAccessException; } CustomerDAOImpl : package rst.spring.mock; import org.springframework.dao.DataAccessException; import org.springframework.orm.hibernate.support.HibernateDaoSupport; /** * Class description. * * @author rst */ public class CustomerDAOHibernateImpl extends HibernateDaoSupport implements CustomerDAO{        public void add(Customer customer) throws DataAccessException{        this.getHibernateTemplate().save(customer);    } }

然后測試的基類SpringDAOTestCase繼承自AbstractTransactionalDataSourceSpringContextTests，目前只有一個(gè)指定測試用xml文件位置的邏輯。

package rst.spring.mock; import org.springframework.test.AbstractTransactionalDataSourceSpringContextTests; /** * Class description. * * @author rst */ public abstract class SpringDAOTestCase extends AbstractTransactionalDataSourceSpringContextTests {  protected String[] getConfigLocations() {    return new String[] { "test.xml" };  } }

接著是我們真正測試的類CustomerDAOTest.java：

package rst.spring.mock; /** * Class description. * * @author rst */ public class CustomerDaoTest extends SpringDAOTestCase {    private CustomerDAOHibernateImpl customerDAO;    protected void onSetUpInTransaction() throws Exception {        super.onSetUpInTransaction();        //this.setPopulateProtectedVariables(true);        customerDAO = (CustomerDAOHibernateImpl) this.applicationContext.getBean("customerDAO");    }    protected void onTearDownInTransaction() {        customerDAO = null;    }    public void testInsert() {        Customer customer = new Customer();        customer.setName("javaeye");        customerDAO.add(customer);        String name = (String) jdbcTemplate.queryForObject("select name from customer where id=?", new Object[]{customer.getId()}, String.class);               assertEquals(customer.getName(), name);    } }

最后看看配置文件test.xml：

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"> <!--  - Application context definition for Petclinic on Hibernate. --> <beans> <!-- ========================= RESOURCE DEFINITIONS ========================= -->   <!-- Configurer that replaces ${...} placeholders with values from a properties file --> <!-- (in this case, JDBC-related settings for the dataSource definition below) --> <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="location"><value>classpath:jdbc.properties</value></property> </bean> <!-- Local DataSource that works in any environment --> <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName"><value>${jdbc.driverClassName}</value></property> <property name="url"><value>${jdbc.url}</value></property> <property name="username"><value>${jdbc.username}</value></property> <property name="password"><value>${jdbc.password}</value></property> </bean> <!-- Hibernate SessionFactory --> <bean id="sessionFactory" class="org.springframework.orm.hibernate.LocalSessionFactoryBean"> <property name="dataSource"><ref local="dataSource"/></property> <property name="mappingResources"> <value>rst/spring/mock/Customer.hbm.xml</value> </property> <property name="hibernateProperties"> <props> <prop key="hibernate.dialect">${hibernate.dialect}</prop> <prop key="hibernate.show_sql">true</prop> </props> </property> </bean> <!-- Transaction manager for a single Hibernate SessionFactory (alternative to JTA) --> <bean id="transactionManager" class="org.springframework.orm.hibernate.HibernateTransactionManager"> <property name="sessionFactory"><ref local="sessionFactory"/></property> </bean> <bean id="hibernateTemplate" class="org.springframework.orm.hibernate.HibernateTemplate"> <property name="sessionFactory"><ref local="sessionFactory"/></property> </bean> <bean id="customerDAO" class="rst.spring.mock.CustomerDAOHibernateImpl"> <property name="hibernateTemplate"><ref local="hibernateTemplate"/></property> </bean> </beans>

這個(gè)文件很簡單，不要忘記transactionManager的配置，Test類會(huì)自動(dòng)裝配的。

運(yùn)行之后，就可以看到應(yīng)有的結(jié)果，并且數(shù)據(jù)庫中不會(huì)有數(shù)據(jù)污染。這個(gè)過程主要是開始一個(gè)transaction，然后開始你的test方法，執(zhí)行dao操作，執(zhí)行sql查詢驗(yàn)證結(jié)果，最后無論成功失敗rollback transaction。

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