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function db_add_unique_key in Drupal 6

Same name in this branch

6 includes/database.mysql-common.inc \db_add_unique_key()
6 includes/database.pgsql.inc \db_add_unique_key()

Same name and namespace in other branches

8 core/includes/database.inc \db_add_unique_key()
7 includes/database/database.inc \db_add_unique_key()

Add a unique key.

Parameters

$ret: Array to which query results will be added.

$table: The table to be altered.

$name: The name of the key.

$fields: An array of field names.

Related topics

Schema API: A Drupal schema definition is an array structure representing one or more tables and their related keys and indexes. A schema is defined by hook_schema(), which usually lives in a modulename.install file.

6 calls to db_add_unique_key()

system_update_6019 in modules/system/system.install: Reconcile small differences in the previous, manually created mysql and pgsql schemas so they are the same and can be represented by a single schema structure.
system_update_6032 in modules/system/system.install: profile_fields.name used to be nullable but is part of a unique key and so shouldn't be.
system_update_6036 in modules/system/system.install: Change the search schema and indexing.
system_update_6043 in modules/system/system.install: Update table indices to make them more rational and useful.
system_update_6055 in modules/system/system.install: Improve indexes on the {url_alias} table.

... See full list

File

includes/database.pgsql.inc, line 780: Database interface code for PostgreSQL database servers.

Code

function db_add_unique_key(&$ret, $table, $name, $fields) {
  $name = '{' . $table . '}_' . $name . '_key';
  $ret[] = update_sql('ALTER TABLE {' . $table . '} ADD CONSTRAINT ' . $name . ' UNIQUE (' . implode(',', $fields) . ')');
}