Triggers

The trigger module defines two classes, Trigger and TriggerDict, derived from DbSchemaObject and DbObjectDict, respectively.

Trigger

Trigger is derived from DbSchemaObject and represents a PostgreSQL regular trigger or constraint trigger.

class pyrseas.dbobject.trigger.Trigger(**attrs)

A procedural language trigger

Trigger.identifier()

Returns a full identifier for the trigger

Returns:string

Trigger.to_map()

Convert a trigger to a YAML-suitable format

Returns:dictionary

Trigger.create(obj, *args, **kwargs)

Return SQL statements to CREATE the trigger

Returns:SQL statements

Trigger Dictionary

TriggerDict is derived from DbObjectDict. It is a dictionary that represents the collection of triggers in a database.

class pyrseas.dbobject.trigger.TriggerDict(dbconn=None)

The collection of triggers in a database

TriggerDict.from_map(table, intriggers)

Initalize the dictionary of triggers by converting the input map

Parameters:

• table – table owning the triggers
• intriggers – YAML map defining the triggers

TriggerDict.diff_map(intriggers)

Generate SQL to transform existing triggers

Parameters:intriggers – a YAML map defining the new triggers Returns:list of SQL statements

Compares the existing trigger definitions, as fetched from the catalogs, to the input map and generates SQL statements to transform the triggers accordingly.