Libraries.Data.Database.Support.Join Documentation

This is a support class for implementing Joins in the Find query. This class holds information about a join so the Join portion of the Find can be written out correctly.

Inherits from: Libraries.Language.Object

Actions Documentation

Compare(Libraries.Language.Object object)

This action compares two object hash codes and returns an integer. The result is larger if this hash code is larger than the object passed as a parameter, smaller, or equal. In this case, -1 means smaller, 0 means equal, and 1 means larger. This action was changed in Quorum 7 to return an integer, instead of a CompareResult object, because the previous implementation was causing efficiency issues.

Parameters

Return

integer: The Compare result, Smaller, Equal, or Larger.

Example

Object o
Object t
integer result = o:Compare(t) //1 (larger), 0 (equal), or -1 (smaller)

Equals(Libraries.Language.Object object)

This action determines if two objects are equal based on their hash code values.

Parameters

Return

boolean: True if the hash codes are equal and false if they are not equal.

Example

use Libraries.Language.Object
use Libraries.Language.Types.Text
Object o
Text t
boolean result = o:Equals(t)

GetHashCode()

This action gets the hash code for an object.

Return

integer: The integer hash code of the object.

Example

Object o
integer hash = o:GetHashCode()

GetJoinCondition()

Returns this joins join condition

Return

text:

GetJoinType()

Returns the type of join this is. The type is set using the SetToXJoin actions so the actual value for the join doesn't need to be remembered.

Return

text:

GetTable()

Returns the table being joined to the query

Return

text:

SetJoinCondition(text condition)

Sets the join condition of this join. In SQL this would be what goes in the ON clause. In the Find query this is converted using the filter converter.

Parameters

  • text condition

SetTable(text table)

Sets the table to join to the query

Parameters

  • text table

SetToCrossJoin()

Sets the type of the join to a Cross Join

SetToInnerJoin()

Sets the type of the join to an Inner Join

SetToLeftJoin()

Sets the type of the join to a Left Join

SetToRightJoin()

Sets the type of the join to a Right Join