什么乱七八糟的东西,getHibernateTemplate().delete(aa)中的delete的要是数据库对象,cascade标识是否级联,如果级联是删除,查询,等等,中的哪个。outer-join是外联合。你还是自己看看文档了。
解决方案 »
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String aa="from Emp as aa where aa.dept.deptno>"+dept.getDeptno();
int j=getHibernateTemplate().delete(aa);
执行这个发生制约性错误,当然也有解决办法,如被注释的代码.问题是这个效率很低,有什么可行的办法可以解决这个问题?
getHibernateTemplate().delete(dept);发生制约性错误?
既然List list=getHibernateTemplate().find("from Emp");
Iterator it=list.iterator();
while(it.hasNext()){
Emp dd=(Emp)it.next();
if((null!=dd.getDept())&&(dd.getDept().getDeptno()==dept.getDeptno()))
getHibernateTemplate().delete(dd);
}
没有错误,那么int j=getHibernateTemplate().delete(aa);也不会错的
从String aa="from Emp as aa where aa.dept.deptno>"+dept.getDeptno();来看你删掉的不是当前这个部门的emp,而在后面你又getHibernateTemplate().delete(dept);在前面又设置了关联emp.setDept(dept);使用你注释掉的那段代码显然是删掉了当前的dept
把String aa="from Emp as aa where aa.dept.deptno>"+dept.getDeptno();改成
String aa="from Emp as aa where aa.dept.deptno="+dept.getDeptno();看看
emp.setDept(dept);
String aa="from Emp as aa where aa.dept.deptno>="+dept.getDeptno();
int j=getHibernateTemplate().delete(aa);
System.out.println("*********"+j+"***********");
aa="from Dept as dept where dept.deptno="+dept.getDeptno();
int i=getHibernateTemplate().delete(aa);
next hbm.xml文件里对时间型支持好像有问题,删除了时间型就一切ok
<property name="hiredate" column="HIREDATE" type="java.util.Date" /> //timestamp也不对,数据库oracle9i,支持的市timestamp,但如果表自动生成的话,通过这个hbm.xml是不能生成的,hibernate 2.1.8相对应的是把这个型翻译成datatime,create table,数据型不支持,错误
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING/DTD BEAN/EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="propertyPlaceholderConfigurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<list>
<value>classpath:jdbc.properties</value>
</list>
</property>
</bean> <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> <bean id="sessionFactory"
class="org.springframework.orm.hibernate.LocalSessionFactoryBean"
abstract="false" singleton="true" lazy-init="default"
autowire="default" dependency-check="default">
<property name="dataSource">
<ref bean="dataSource" />
</property>
<property name="mappingResources">
<list>
<value>spring/Dept.hbm.xml</value>
<value>spring/Emp.hbm.xml</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.dialect">
${hibernate.dialect}
</prop>
<prop key="hibernate.show_sql">
${hibernate.show_sql}
</prop>
<prop key="hibernate.jdbc.fetch_size">
${hibernate.jdbc.fetch_size}
</prop>
<prop key="hibernate.jdbc.batch_size">
${hibernate.jdbc.batch_size}
</prop><!--
<prop key="hibernate.hbm2ddl.auto">
create
</prop>
--></props> </property>
</bean> <bean id="transactionManager"
class="org.springframework.orm.hibernate.HibernateTransactionManager">
<property name="sessionFactory">
<ref local="sessionFactory" />
</property> </bean>
<bean id="userDAO" class="spring.UserDAO">
<property name="sessionFactory">
<ref local="sessionFactory" />
</property>
</bean> <bean id="intercept"
class="org.springframework.orm.hibernate.HibernateInterceptor">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean>
<bean id="UserManager"
class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
<property name="transactionManager">
<ref bean="transactionManager" />
</property>
<property name="target">
<ref local="userDAO" />
</property>
<property name="transactionAttributes">
<props>
<prop key="insert*">
PROPAGATION_REQUIRED,-SQLException
</prop>
<prop key="delete*">
PROPAGATION_REQUIRED,-SQLException
</prop>
<prop key="update*">
PROPAGATION_REQUIRED,-SQLException
</prop>
<prop key="*">PROPAGATION_REQUIRED,readOnly</prop>
</props>
</property>
<property name="preInterceptors">
<list>
<ref local="intercept" />
</list>
</property>
<property name="postInterceptors">
<list>
<ref local="intercept" />
</list>
</property>
</bean>
<bean id="txProxyTemplate" abstract="true"
class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
<property name="transactionManager">
<ref bean="transactionManager" />
</property>
<property name="transactionAttributes">
<props>
<prop key="insert*">
PROPAGATION_REQUIRED,-SQLException
</prop>
<prop key="delete*">
PROPAGATION_REQUIRED,-SQLException
</prop>
<prop key="update*">
PROPAGATION_REQUIRED,-SQLException
</prop>
<prop key="*">PROPAGATION_REQUIRED,readOnly</prop>
</props>
</property>
</bean>
</beans>
oracle的接连修改的触发器怎么写??是不是11i什么的接连修改已经内置了?