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- Patch #69659 by derek: improved documentation of db abstraction layer.

5.x
Dries Buytaert 2006-06-19 06:12:08 +00:00
parent 1a68f48c30
commit 0147fa3b75
1 changed files with 6 additions and 4 deletions
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10
update.php
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@ -28,9 +28,11 @@ function update_sql($sql) {
* Save result of SQL commands in $ret array. * Save result of SQL commands in $ret array.
* *
* Note: when you add a column with NOT NULL and you are not sure if there are * Note: when you add a column with NOT NULL and you are not sure if there are
* already rows in the table, you MUST also add DEFAULT. Otherwise PostgreSQL won't * already rows in the table, you MUST also add DEFAULT. Otherwise PostgreSQL
* work when the table is not empty. If NOT NULL and DEFAULT are set the * won't work when the table is not empty, and db_add_column() will fail.
* PostgreSQL version will set values of the added column in old rows to the * To have an empty string as the default, you must use: 'default' => "''"
* in the $attributes array. If NOT NULL and DEFAULT are set the PostgreSQL
* version will set values of the added column in old rows to the
* DEFAULT value. * DEFAULT value.
* *
* @param $ret * @param $ret
@ -44,7 +46,7 @@ function update_sql($sql) {
* @param $attributes * @param $attributes
* Additional optional attributes. Recognized attributes: * Additional optional attributes. Recognized attributes:
* not null => TRUE|FALSE * not null => TRUE|FALSE
* default => NULL|FALSE|value (with or without '', it won't be added) * default => NULL|FALSE|value (the value must be enclosed in '' marks)
* @return * @return
* nothing, but modifies $ret parameter. * nothing, but modifies $ret parameter.
*/ */