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Builds a Join Query, by adding another dataobject to this one. Be careful when using this, raw queries may be clearer than using joinAdd.
Thanks to Stijn de Reede for the implementation of this.
object $obj - joining object (no value resets the join)
string $joinType - "LEFT" | "INNER " | "RIGHT" | ""
INNER is default, "" indicates just select ... from a,b,c with no join and links are added as where items.
Note: 'LEFT' is the same as LEFT OUTER.
string $joinAs - if you want to select the table as anther name useful when you want to select multiple columns from a secondary table.
string $joinCol - The column on This objects table to match,needed if this table links to the child object in multiple places eg.
Beispiel 34-1. using specific join Columns
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Diese Methode kann nicht statisch aufgerufen werden.
The Examples below are not tested, use DB_DataObject::debugLevel(1), to see what exactly is going on when you use this, and send the author some better examples..
Beispiel 34-2. Simple simple Join
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Beispiel 34-3. Resulting SQL
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Beispiel 34-4. More Complex Join query
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Beispiel 34-5. Resulting SQL
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->selectAs() | Nach oben | ->set*() and ->get*() |