HQL and Hibernate Criteria with Having and GROUP BY clause

问题

I have Problem when I executing the following Hibernate HQL Query:

String hql = "from ProcessInstanceHistory where processInstance.processInstanceId=122 group by newStatusId having max(processModifiedDate)";
Query query = session.createQuery(hql);

List qResult = query.list();
ProcessInstanceHistory processInstanceHistory = (ProcessInstanceHistory) qResult.get(0);

It gives me Following error when I run above script without HAVING clause:

org.hibernate.exception.SQLGrammarException: could not execute query
    at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:67)
    at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
    at org.hibernate.loader.Loader.doList(Loader.java:2223)
    at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2104)
    at org.hibernate.loader.Loader.list(Loader.java:2099)
    at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:378)
    at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:338)
    at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:172)
    at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1121)
    at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
    at Test.main(Test.java:140)
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: 'tne_travel_7_4_1.processins0_.PI_HISTORY_ID' isn't in GROUP BY
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
    at com.mysql.jdbc.Util.getInstance(Util.java:381)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1030)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3515)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3447)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1951)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2101)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2554)
    at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1761)
    at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1912)
    at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:186)
    at org.hibernate.loader.Loader.getResultSet(Loader.java:1787)
    at org.hibernate.loader.Loader.doQuery(Loader.java:674)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
    at org.hibernate.loader.Loader.doList(Loader.java:2220)
    ... 8 more

And when I use HAVING clause it gives:

org.hibernate.hql.ast.QuerySyntaxException: unexpected AST node: max near line 1, column 117 [from tne.nexstep.dao.ProcessInstanceHistory where processInstance.processInstanceId=122 group by newStatusId having max(processModifiedDate)]
    at org.hibernate.hql.ast.QuerySyntaxException.convert(QuerySyntaxException.java:31)
    at org.hibernate.hql.ast.QuerySyntaxException.convert(QuerySyntaxException.java:24)
    at org.hibernate.hql.ast.ErrorCounter.throwQueryException(ErrorCounter.java:59)
    at org.hibernate.hql.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:235)
    at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:160)
    at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:111)
    at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:77)
    at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:56)
    at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:72)
    at org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:133)
    at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:112)
    at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1623)
    at Test.main(Test.java:138)

I had also try with Hibernate Criteria but it won't work.

Is their any other way to acheive the same task ?

Thanks in Advance

回答1:

Your having clause is incomplete. It needs to be a condition e.g. having max(processModifiedDate) > 1. Also, you need to project using aggregate functions and if you need to project on certain columns, they need to be in the group by. Currently, all columns(fields) in the ProcessInstanceHistory class are in the projection. e.g.,

String hql = "Select newStatusId, max(processModifiedDate) from ProcessInstanceHistory where processInstance.processInstanceId=122 group by newStatusId having max(processModifiedDate) > 1";

More information on the HAVING clause can be found at http://www.w3schools.com/sql/sql_having.asp.

来源：https://stackoverflow.com/questions/23390932/hql-and-hibernate-criteria-with-having-and-group-by-clause

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hibernate

hql