org.squashtest.tm.service.internal.hibernate
Class GroupConcatFunction

java.lang.Object
  org.hibernate.dialect.function.StandardSQLFunction
      org.squashtest.tm.service.internal.hibernate.GroupConcatFunction

All Implemented Interfaces:

org.hibernate.dialect.function.SQLFunction

public class GroupConcatFunction
extends org.hibernate.dialect.function.StandardSQLFunction

This custom implementation of group_concat. Because it can contain an embedded expression, hibernate will try to parse it just as if it was within the scope of the main query - thus causing parsing exception.

To prevent this we had to make the awkward syntax as follow:

• group_concat(col identifier) : will concatenate as expected over the column identifier.
• group_concat(col identifier 1, 'order by', col identifier 2, ['asc|desc']) : will send this to the target db as 'group_concat(id1 order by id2 [asc|desc])'

Author:

bsiri

Constructor Summary

GroupConcatFunction(String name)

GroupConcatFunction(String name, org.hibernate.type.Type registeredType)

Method Summary

String

render(org.hibernate.type.Type firstArgumentType, List arguments, org.hibernate.engine.spi.SessionFactoryImplementor sessionFactory)

Methods inherited from class org.hibernate.dialect.function.StandardSQLFunction

getName, getReturnType, getType, hasArguments, hasParenthesesIfNoArguments, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

GroupConcatFunction

public GroupConcatFunction(String name,
                           org.hibernate.type.Type registeredType)

GroupConcatFunction

public GroupConcatFunction(String name)

Method Detail

render

public String render(org.hibernate.type.Type firstArgumentType,
                     List arguments,
                     org.hibernate.engine.spi.SessionFactoryImplementor sessionFactory)

Specified by:

render in interface org.hibernate.dialect.function.SQLFunction

Overrides:

render in class org.hibernate.dialect.function.StandardSQLFunction