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check_column › WordPress Function

Od1.0.0
Przestarzałyn/a
› check_column ( $table_name, $col_name, $col_type, $is_null = null, $key = null, $default_value = null, $extra = null )
Parametry: (7)
  • (string) $table_name Database table name.
    Wymagane: Tak
  • (string) $col_name Table column name.
    Wymagane: Tak
  • (string) $col_type Table column type.
    Wymagane: Tak
  • (bool) $is_null Optional. Check is null.
    Wymagane: Nie
    Domyślny: null
  • (mixed) $key Optional. Key info.
    Wymagane: Nie
    Domyślny: null
  • (mixed) $default_value Optional. Default value.
    Wymagane: Nie
    Domyślny: null
  • (mixed) $extra Optional. Extra value.
    Wymagane: Nie
    Domyślny: null
Powrót:
  • (bool) True, if matches. False, if not matching.
Zdefiniowane na:
Codex:

Checks that database table column matches the criteria.

Uses the SQL DESC for retrieving the table info for the column. It will help understand the parameters, if you do more research on what column information is returned by the SQL statement. Pass in null to skip checking that criteria. Column names returned from DESC table are case sensitive and are as listed: - Field - Type - Null - Key - Default - Extra


Powiązane Funkcje: check_comment, the_comment, check_comment_flood_db, wp_check_comment_flood, maybe_add_column

Źródło 

function check_column( $table_name, $col_name, $col_type, $is_null = null, $key = null, $default_value = null, $extra = null ) {
	global $wpdb;

	$diffs = 0;

	// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared -- Cannot be prepared. Fetches columns for table names.
	$results = $wpdb->get_results( "DESC $table_name" );

	foreach ( $results as $row ) {

		if ( $row->Field === $col_name ) {

			// Got our column, check the params.
			if ( ( null !== $col_type ) && ( $row->Type !== $col_type ) ) {
				++$diffs;
			}
			if ( ( null !== $is_null ) && ( $row->Null !== $is_null ) ) {
				++$diffs;
			}
			if ( ( null !== $key ) && ( $row->Key !== $key ) ) {
				++$diffs;
			}
			if ( ( null !== $default_value ) && ( $row->Default !== $default_value ) ) {
				++$diffs;
			}
			if ( ( null !== $extra ) && ( $row->Extra !== $extra ) ) {
				++$diffs;
			}

			if ( $diffs > 0 ) {
				return false;
			}

			return true;
		} // End if found our column.
	}

	return false;
}