Question

以下是我的POJO和用于检索给定帐户角色的HQL查询的代码。出于某种原因，HQL查询导致了＆＃39; 0＆＃39;即使数据库中存在匹配项，也会选择行。

@Entity
@Table(name="account_roles")

public class AccountRoles implements Serializable {

     @Column(name = "roleName")
     private String roleName;

     @Column(name = "accountNumber")
     private String accountNumber;

     @Id
     @Column(name = "iD")
     private int iD;

     public String getRoleName() { return roleName; }
     public void setRoleName(String roleName){ this.roleName = roleName;}

     public String getAccountNumber() { return accountNumber;}
     public void setAccountNumber(String accountNumber){ this.accountNumber = accountNumber;}

     public int getId() { return iD;}
     public void setId(int iD){ this.iD = iD; }

}

@Override
@SuppressWarnings("unchecked")
public AccountRoles getKey(String accountNum, String roleName) throws Exception{
    String sql = "from AccountRoles where accountNumber= :accountNumber AND roleName= :roleName";
    Session session = getSessionFactory().getCurrentSession();
    List<AWSAccountRoles> accountRoles;
    try{
        accountRoles = session.createQuery(sql)
                .setString("accountNumber",accountNum)
                .setString("roleName",roleName)
                .list();
        if(accountRoles.size() >0 ){
            System.out.println(" found at least 1 row");
            return accountRoles.get(0);
        }else{
            System.out.println("returned empty list");
            return null;
        }
    }catch (Exception ex){
        ex.printStackTrace();
        throw ex;
    }

表的DDL如下：

CREATE TABLE `account_roles` (
  `iD` int(11) NOT NULL AUTO_INCREMENT,
  `accountNumber` varchar(15) NOT NULL,
  `roleName` varchar(25) NOT NULL,
   PRIMARY KEY (`id`),
   KEY `accountNumber` (`accountNumber`,`roleName`)
) ENGINE=InnoDB AUTO_INCREMENT=63 DEFAULT CHARSET=latin1;

需要一些帮助来调试查询导致空列表（或＆＃39; 0＆＃39;行）的原因

Answer 1

发现了这个问题。我面临的问题是递归的@Transactional事件的结果。一旦我分离出调用，查询和插入工作正常。

Hibernate HQL选择查询的问题

1 个答案: