Add documention and change log

Author: sclubricants

user_guide_src/source/changelogs/v4.3.0.rst

@@ -72,6 +72,7 @@ Database
 - SQLite :ref:`BaseConnection::getIndexData() <db-metadata-getindexdata>` now can return pseudo index named ``PRIMARY`` for `AUTOINCREMENT` column, and each returned index data has ``type`` property.
 - SQLSRV now automatically drops ``DEFAULT`` constraint when using :ref:`Forge::dropColumn() <db-forge-dropColumn>`.
 - ``BaseConnection::escape()`` now excludes the ``RawSql`` data type. This allows passing SQL strings into data.
+- The new method ``Forge::dropPrimaryKey()`` allows dropping the primary key on a table.
 
 Model
 =====

user_guide_src/source/dbmgmt/forge.rst

@@ -229,6 +229,13 @@ Execute a DROP KEY.
 
 .. literalinclude:: forge/020.php
 
+Dropping a Primary Key
+======================
+
+Execute a DROP PRIMARY KEY.
+
+.. literalinclude:: forge/028.php
+
 Renaming a Table
 ================
 

user_guide_src/source/dbmgmt/forge/028.php

@@ -0,0 +1,5 @@
+<?php
+
+// MySqli Produces: ALTER TABLE `tablename` DROP PRIMARY KEY
+// Others Produces: ALTER TABLE `tablename` DROP CONSTRAINT `pk_tablename`
+$forge->dropPrimaryKey('tablename');