JPA 命名查询 |删除 |无法键入更新/删除查询：答案

【问题标题】：JPA Named Query | Delete | Update/delete queries cannot be typed :JPA 命名查询 |删除 |无法键入更新/删除查询：
【发布时间】：2021-07-01 05:47:25
【问题描述】：

我的代码如下：实体

@Entity(name = "TerpCrtV")
@NamedQueries({
     @NamedQuery(name = "deleteAllCrt", query = "DELETE FROM TerpCrtV")
})

命名查询在 DAO 层中调用如下：

@PersistenceContext(unitName="masterPU")
private EntityManager entityManagerMaster;

public int deleteAllCustomerTeams() throws Exception {
    return entityManagerMaster.createNamedQuery("deleteAllCrt", TerpCrtV.class).executeUpdate();
}

使用 usertransaction 调用如下：用户事务是 EJB 之一并注入到 bean 中

private void persist(List<TerpCrtV> terpCustomerTeams) throws Exception  {
    logger.info("In CustomerTeamsCopierImpl: Delete all CRT");
    userTransaction.begin();
    deleteAllCrtV();
    userTransaction.commit();

我面临的错误如下：

2021-04-05 12:36:53,454 ERROR [org.jboss.as.ejb3.invocation] (EJB default - 2) WFLYEJB0034: EJB Invocation failed on component MasterdataPersistence for method public int com.evry.integrator.crm.persistence.MasterdataPersistence.deleteAllCustomerTeams() throws java.lang.Exception: javax.ejb.EJBTransactionRolledbackException: Update/delete queries cannot be typed
        at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInCallerTx(CMTTxInterceptor.java:203)
        at org.jboss.as.ejb3.tx.CMTTxInterceptor.required(CMTTxInterceptor.java:364)
       ]com.evry.integrator.crm.persistence.MasterdataPersistence$$$view7.deleteAllCustomerTeams(Unknown Source)
        at com.evry.integrator.terpcrm.schedular.CustomerTeamsCopierImpl.deleteAllCrtV(CustomerTeamsCopierImpl.java:86)
        at com.evry.integrator.terpcrm.schedular.CustomerTeamsCopierImpl.persist(CustomerTeamsCopierImpl.java:64)
        at com.evry.integrator.terpcrm.schedular.CustomerTeamsCopierImpl.importDataFromTerpAndInsertToMasterdata(CustomerTeamsCopierImpl.java:139)

【问题讨论】：

标签： jpa ejb named-query

【解决方案1】：

它告诉你调用createNamedQuery时不能有第二个参数（因为你没有返回任何结果）。

这应该可行：

entityManagerMaster.createNamedQuery("deleteAllCrt").executeUpdate();

【讨论】：