我有JPA和Hibernate的问题,我无法解决它.
所以,这是我的applicationContext.xml:
<context:component-scan base-package="com.abt.fiifootballmanager">
<context:exclude-filter type="annotation"
expression="org.springframework.stereotype.Controller" />
</context:component-scan>
<jdbc:embedded-database type="HSQL" id="dataSource" />
<bean
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
id="emf">
<property name="packagesToScan" value="com.abt.fiifootballmanager.entity" />
<property name="dataSource" ref="dataSource" />
<property name="jpaProperties">
<props>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.hbm2ddl.auto">create</prop>
</props>
</property>
<property name="persistenceProvider">
<bean class="org.hibernate.jpa.HibernatePersistenceProvider" />
</property>
</bean>
<tx:annotation-driven transaction-manager="transactionManager"/>
<bean class="org.springframework.orm.jpa.JpaTransactionManager" id="transactionManager">
<property name="dataSource" value="dataSource"/>
</bean>
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这是我的Performance实体:
package com.abt.fiifootballmanager.entity;
import java.io.Serializable;
import javax.persistence.*;
import java.math.BigDecimal;
import java.util.List;
@Entity
@Table(name="PERFORMANCES")
@NamedQuery(name="Performance.findAll", query="SELECT p FROM Performance p")
public class Performance implements Serializable {
private static final long serialVersionUID = …Run Code Online (Sandbox Code Playgroud) 我有一个功能, void *Client(void *threaData){}
你能告诉我一些关于void *threadData参数的事吗?当你使用void *参数时,为什么?
我有接下来的 3 个表:
我必须用斐波那契表中的质数填充 FiboPrime 表(质数=1 => 数字是质数,否则数字不是质数。)
我必须使用 MERGE 语句,它是尝试:
DECLARE
BEGING
MERGE INTO FiboPrime fp
USING fibonacci f, prime p
ON (f.value=p.value)
WHEN MATCHED THEN
UPDATE SET
fp.value=f.value,
fp.prime=1;
WHEN NOT MATCHED THEN
INSERT VALUES(f.value,0);
END;
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我收到下一个错误:当期望出现以下情况之一时,出现符号“INTO”: := .( @ ; not null range character。谁能帮我解决这个问题?
让我们假设 C 程序中有下一个代码片段:
#ifdef USE_FORK
CODE...
#else
phtread_t thread;
pthread_create(&thread,NULL,clientDispatch,&client);
#endif
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你能解释一下这些指令是什么吗,ifdef、else、endif。当我们使用 C 指令时会发生什么?