Question

首先，以下是使用的技术：hibernate v5.1.0.Final，javaee-api 7.0，Java 8，Postgres 9.6.1 给出的是 postgres db：

CREATE TABLE employee (
  id SERIAL PRIMARY KEY,
  name varchar NOT NULL ,
  last_name varchar NOT NULL ,
  hired_date date
);
CREATE TABLE ticket (
  id SERIAL PRIMARY KEY,
  parent_ticket_id bigint REFERENCES ticket (id),
  code varchar,
  description varchar
);
CREATE TYPE ticket_status AS ENUM ('OPENED', 'RESOLVED', 'CLOSED');
CREATE TABLE tickets_assigned (
  id SERIAL PRIMARY KEY,
  employee_id bigint REFERENCES employee (id) NOT NULL ,
  ticket_id bigint REFERENCES ticket (id) NOT NULL ,
  status ticket_status,
  assigned_date timestamp,
  resolved_date timestamp,
  closed_date timestamp,
  UNIQUE (employee_id, ticket_id)
);

我在数据库中插入了一些值。例如。我插入埃尔维斯普雷斯利所有的东西关闭1张门票。然后我在psql中创建一个查询（考虑ROW_NUMBER() OVER, COUNT and GROUP BY）来查看Elvis的统计数据：

SELECT e.id,
       e.name,
       e.last_name,
       e.hired_date,
       ROW_NUMBER() OVER(ORDER BY e.id ASC),
       COUNT(a.id)
FROM employee e
LEFT JOIN assigned_tickets a ON e.id=a.employee_id
AND a.status='CLOSED'
GROUP BY e.id

这对我来说非常有效，像：

...
2 elvis presley 1967-10-10 2 1
...

然后我使用

Entitymanager.createNativeQuery(...)

在我的EJB项目中使用Hibernate v5.1.0进行SAME SQL QUERY，这就是我得到的：

COUNT() GROUP BY在任何情况下都会返回0，无视输入。
Hibernate对ROW_NUMBER() OVER(e.id ASC)感叹，让我写出像ROW_NUMBER() OVER()这样的表达式，这会导致我没有预料到的行为（例如2 guys with #3和1 guy with #2 list.length=3 }}）。

猫王变得像：2 elvis presley 1967-10-10 3 0

我如何解决这两个问题？我请求你的帮助。如果需要，可以提供所有其他的东西。

UPD。

entityManager.createNativeQuery("SELECT e.id as ID, e.name AS NAME," +
            " e.last_name AS LAST_NAME, e.hired_date AS HIRED_DATE," +
            "  ROW_NUMBER() OVER(ORDER BY e.id ASC) AS ROW_NUM, COUNT(a.id) AS NUM_CLOSED  FROM employee e" +
            " LEFT JOIN assigned_tickets a ON e.id=a.employee_id AND a.status='CLOSED' GROUP BY e.id",
            "EmpDtoMapping")
            .getResultList()

Hibernate哀叹： Caused by: org.h2.jdbc.JdbcSQLException: ?????????????? ?????? ? ????????? SQL "SELECT E.ID AS ID, E.NAME AS NAME, E.LAST_NAME AS LAST_NAME, E.HIRED_DATE AS HIRED_DATE, ROW_NUMBER() OVER(ORDER[*] BY E.ID ASC) AS ROW_NUM, COUNT(A.ID) AS NUM_CLOSED FROM EMPLOYEE E LEFT JOIN ASSIGNED_TICKETS A ON E.ID=A.EMPLOYEE_ID AND A.STATUS='CLOSED' GROUP BY E.ID "; ????????? ")" Syntax error in SQL statement "SELECT E.ID AS ID, E.NAME AS NAME, E.LAST_NAME AS LAST_NAME, E.HIRED_DATE AS HIRED_DATE, ROW_NUMBER() OVER(ORDER[*] BY E.ID ASC) AS ROW_NUM, COUNT(A.ID) AS NUM_CLOSED FROM EMPLOYEE E LEFT JOIN ASSIGNED_TICKETS A ON E.ID=A.EMPLOYEE_ID AND A.STATUS='CLOSED' GROUP BY E.ID "; expected ")"; SQL statement: SELECT e.id as ID, e.name AS NAME, e.last_name AS LAST_NAME, e.hired_date AS HIRED_DATE, ROW_NUMBER() OVER(ORDER BY e.id ASC) as ROW_NUM, COUNT(a.id) as NUM_CLOSED FROM employee e LEFT JOIN assigned_tickets a ON e.id=a.employee_id AND a.status='CLOSED' GROUP BY e.id [42001-173]

期望获得：

id name surname date       row#  num of closed tkts
1 elvis presley 1967-10-10  1    1

如果试图修复我写： ROW_NUMBER() OVER()代替ROW_NUMBER() OVER(ORDER BY e.id ASC) 我得到了：

1 elvis presley 1967-10-10   2   0

使用COUNT(a.id) ... GROUP BY e.id

ResultSet sql映射（仅适用于一般订单）：

@SqlResultSetMapping(
    name="EmpDtoMapping",
    classes={
            @ConstructorResult(
                    targetClass=com.alexchulkin.dto.EmpDto.class,
                    columns={
                            @ColumnResult(name="ID", type = Long.class),
                            @ColumnResult(name="NAME", type = String.class),
                            @ColumnResult(name="LAST_NAME", type = String.class),
                            @ColumnResult(name="HIRED_DATE", type = Date.class),
                            @ColumnResult(name="ROW_NUM", type = Integer.class),
                            @ColumnResult(name="NUM_CLOSED", type = BigInteger.class)
                    })})

UPD2 部署了h2和postgres驱动程序：

20:24:52,004 INFO  [org.jboss.as.connector.subsystems.datasources] (ServerService Thread Pool -- 33) WFLYJCA0004: Deploying JDBC-compliant driver class org.h2.Driver (version 1.3)
20:24:52,022 INFO  [org.jboss.as.connector.deployers.jdbc] (MSC service thread 1-8) WFLYJCA0018: Started Driver service with driver-name = h2
20:25:05,786 INFO  [org.jboss.as.connector.deployers.jdbc] (MSC service thread 1-1) WFLYJCA0005: Deploying non-JDBC-compliant driver class org.postgresql.Driver (version 9.3)
20:25:08,716 INFO  [org.jboss.as.connector.deployers.jdbc] (MSC service thread 1-3) WFLYJCA0018: Started Driver service with driver-name = DI-project-1.0-SNAPSHOT.war_org.postgresql.Driver_9_3

的persistence.xml：

<persistence xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://java.sun.com/xml/ns/persistence"
         xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
         version="2.0">
<persistence-unit name="entityManager">
    <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
    <!-- Annotated entity classes -->
    <class>com.alexchulkin.domain.Emp</class>
    <class>com.alexchulkin.domain.Tkt</class>
    <class>com.alexchulkin.domain.AssignedTkt</class>
    <properties>
        <property name="hibernate.connection.url" value="jdbc:postgresql://localhost/di_project" />
        <property name="hibernate.connection.driver_class" value="org.postgresql.Driver" />
        <property name="hibernate.connection.username" value="postgres" />
        <property name="hibernate.connection.password" value="root" />
        <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQL82Dialect" />
        <property name="hibernate.hbm2ddl.auto" value="create-drop" />
        <property name="show_sql" value="true" />
        <property name="format_sql" value="true" />
        <property name="use_sql_comments" value="true" />
        <!--<property name="hibernate.hbm2ddl.import_files" value="/schema.sql"/>-->
    </properties>
</persistence-unit>

为什么count（）和ROW_NUMBER（）OVER在Hibernate的本机查询中没有正常工作？

0 个答案: