org.hibernate.dialect.function
Class PositionSubstringFunction

java.lang.Object
  extended by org.hibernate.dialect.function.PositionSubstringFunction
All Implemented Interfaces:
SQLFunction

public class PositionSubstringFunction
extends Object
implements SQLFunction

Emulation of locate() on PostgreSQL


Constructor Summary
PositionSubstringFunction()
           
 
Method Summary
 Type getReturnType(Type firstArgumentType, Mapping mapping)
          The return type of the function.
 boolean hasArguments()
          Does this function have any arguments?
 boolean hasParenthesesIfNoArguments()
          If there are no arguments, are parentheses required?
 String render(Type firstArgumentType, List args, SessionFactoryImplementor factory)
          Render the function call as SQL fragment.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

PositionSubstringFunction

public PositionSubstringFunction()
Method Detail

hasArguments

public boolean hasArguments()
Description copied from interface: SQLFunction
Does this function have any arguments?

Specified by:
hasArguments in interface SQLFunction
Returns:
True if the function expects to have parameters; false otherwise.

hasParenthesesIfNoArguments

public boolean hasParenthesesIfNoArguments()
Description copied from interface: SQLFunction
If there are no arguments, are parentheses required?

Specified by:
hasParenthesesIfNoArguments in interface SQLFunction
Returns:
True if a no-arg call of this function requires parentheses.

getReturnType

public Type getReturnType(Type firstArgumentType,
                          Mapping mapping)
                   throws QueryException
Description copied from interface: SQLFunction
The return type of the function. May be either a concrete type which is preset, or variable depending upon the type of the first function argument.

Note, the 'firstArgumentType' parameter should match the one passed into SQLFunction.render(org.hibernate.type.Type, java.util.List, org.hibernate.engine.spi.SessionFactoryImplementor)

Specified by:
getReturnType in interface SQLFunction
Parameters:
firstArgumentType - The type of the first argument
mapping - The mapping source.
Returns:
The type to be expected as a return.
Throws:
QueryException - Indicates an issue resolving the return type.

render

public String render(Type firstArgumentType,
                     List args,
                     SessionFactoryImplementor factory)
              throws QueryException
Description copied from interface: SQLFunction
Render the function call as SQL fragment.

Note, the 'firstArgumentType' parameter should match the one passed into SQLFunction.getReturnType(org.hibernate.type.Type, org.hibernate.engine.spi.Mapping)

Specified by:
render in interface SQLFunction
Parameters:
firstArgumentType - The type of the first argument
args - The function arguments
factory - The SessionFactory
Returns:
The rendered function call
Throws:
QueryException - Indicates a problem rendering the function call.


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