maybe_add_column( string $table_name, string $column_name, string $create_ddl )
Adds column to a database table if it doesn’t already exist.
Parameters
- $table_name
-
(Required) The table name to modify.
- $column_name
-
(Required) The column name to add to the table.
- $create_ddl
-
(Required) The SQL statement used to add the column.
Return
(bool) True if already exists or on successful completion, false on error.
Source
File: wp-admin/includes/upgrade.php
function maybe_add_column($table_name, $column_name, $create_ddl) {
global $wpdb;
foreach ($wpdb->get_col("DESC $table_name", 0) as $column ) {
if ($column == $column_name) {
return true;
}
}
// Didn't find it try to create it.
$wpdb->query($create_ddl);
// We cannot directly tell that whether this succeeded!
foreach ($wpdb->get_col("DESC $table_name", 0) as $column ) {
if ($column == $column_name) {
return true;
}
}
return false;
}
Changelog
| Version | Description |
|---|---|
| WP-1.3.0 | Introduced. |