public function getFK(TableSchema $table, $indent = 0)
    {
        if (empty($table->foreignKeys)) {
            return '';
        }

        $string = $this->db->createCommand("SHOW CREATE TABLE {$table->name}")->queryAll();
        $onParams = $this->FKOnParams($string[0]['Create Table']);

        $textIndent = $this->textIndent($indent);
        $definition = $textIndent;
        $definition .= '$tablePrefix = \Yii::$app->getDb()->tablePrefix;' . self::ENTER;
        $tableName = static::removePrefix($table->name, $this->db->tablePrefix);

        foreach ($table->foreignKeys as $fkName => $fk) {
            $refTable = '';
            $refColumns = '';
            $columns = '';
            $delete = isset($onParams[$fkName]['ON DELETE']) ? "'{$onParams[$fkName]['ON DELETE']}'" : 'null';
            $update = isset($onParams[$fkName]['ON UPDATE']) ? "'{$onParams[$fkName]['ON UPDATE']}'" : 'null';
            $fkName = static::removePrefix($fkName, $this->db->tablePrefix);

            foreach ($fk as $k => $v) {
                if (0 === $k) {
                    $refTable = $v;
                } else {
                    $columns = $k;
                    $refColumns = $v;
                }
            }

            $definition .= $textIndent;
            $definition .= "\$this->runSuccess[\$tablePrefix.'{$fkName}'] = ";
            $definition .= sprintf(
                    "\$this->addForeignKey(\$tablePrefix.'%s', '{{%%%s}}', '%s', '{{%%%s}}', '%s', %s, %s);" . self::ENTER,
                    $fkName, // 外健名称
                    $tableName, // 表名
                    $columns, // 列名
                    static::removePrefix($refTable, $this->db->tablePrefix), // 对应外健的表名
                    $refColumns, // 对应外健的列名
                    $delete, // ON DELETE
                    $update // ON UPDATE
                );

        }
        return $definition;
    }