maybe_create_table( string $table_name, string $create_ddl ): bool
Creates a table in the database, if it doesn’t already exist.
Description
This method checks for an existing database and creates a new one if it’s not already present. It doesn’t rely on MySQL’s "IF NOT EXISTS" statement, but chooses to query all tables first and then run the SQL statement creating the table.
Parameters
-
$table_namestring Required -
Database table name.
-
$create_ddlstring Required -
SQL statement to create table.
Return
bool True on success or if the table already exists. False on failure.
Source
File: wp-admin/includes/upgrade.php.
View all references
function maybe_create_table( $table_name, $create_ddl ) {
global $wpdb;
$query = $wpdb->prepare( 'SHOW TABLES LIKE %s', $wpdb->esc_like( $table_name ) );
if ( $wpdb->get_var( $query ) === $table_name ) {
return true;
}
// Didn't find it, so try to create it.
$wpdb->query( $create_ddl );
// We cannot directly tell that whether this succeeded!
if ( $wpdb->get_var( $query ) === $table_name ) {
return true;
}
return false;
}
Changelog
| Version | Description |
|---|---|
| 1.0.0 | Introduced. |
User Contributed Notes
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Before calling this function you have to manually include ‘upgrade.php’, otherwise you will end up with white screen of death.
require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );