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Previously I asked how to ALTER TABLE in Magento setup script without using SQL. There, Ivan gave an excellent answer which I still refer to even now.
However I have yet to discover how to use Varien_Db_Ddl_Table::addColumn() to specify an auto_increment column. I think it has something to do with an option called identity but so far have had no luck.
Is this even possible or is that functionality incomplete?
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Here's the SQL statement to add AUTO INCREMENT constraint to id column. ALTER TABLE sales MODIFY id INT NOT NULL AUTO_INCREMENT PRIMARY KEY; Next we will add a couple of rows in sales table. As you can see, the MySQL has automatically increased and populated id column with values 7 and 8.
Auto-increment allows a unique number to be generated automatically when a new record is inserted into a table. Often this is the primary key field that we would like to be created automatically every time a new record is inserted.
You can't have two auto-increment columns.
You can also make an auto increment in SQL to start from another value with the following syntax: ALTER TABLE table_name AUTO_INCREMENT = start_value; In the syntax above: start_value: It is the value from where you want to begin the numbering.
One can create an autoincrement column like that (at least since Magento 1.6, maybe even earlier):
/** @var $table Varien_Db_Ddl_Table */
$table->addColumn( 'id', Varien_Db_Ddl_Table::TYPE_INTEGER, null, array(
'auto_increment' => true,
'unsigned' => true,
'nullable' => false,
'primary' => true,
), 'ID' );
Instead of "auto_increment", one may also use the keyword "identity".
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