/**
* Fetches column metadata from the database.
*
* @return array
*/
protected function fetchColumns()
{
$cache_key = 'wpapp_db_col_' . get_current_blog_id() . $this->tableName;
$cached = wp_cache_get($cache_key, 'dbmeta', false, $found);
if ($found && $cached) {
return $cached;
}
$results = (array) $this->connection->wpdb()->get_results("select C.COLUMN_NAME, C.COLUMN_DEFAULT, C.DATA_TYPE, C.CHARACTER_MAXIMUM_LENGTH, " . "C.NUMERIC_PRECISION, C.IS_NULLABLE, C.COLUMN_KEY, C.EXTRA, C.COLLATION_NAME " . "from INFORMATION_SCHEMA.COLUMNS as C where C.TABLE_NAME = '{$this->tableName}'");
$columns = array();
foreach ($results as $data) {
$column = new Table\Column($data);
$columns[$column->name] = $column;
}
wp_cache_set($cache_key, $columns, 'dbmeta', 600);
return $columns;
}
