MongoCursor::doQuery

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MongoCursor::doQuery — Execute the query.

说明

protected void MongoCursor::doQuery ( void )

Warning

Please do not use me.

This function actually queries the database. All queries and commands go through this function. Thus, this function can be overridden to provide custom query handling.

This handles serializing your query, sending it to the database, receiving a response, and deserializing it. Thus, if you are planning to override this, your code should probably call out to the original to use the existing functionality (see the example below).

参数

此函数没有参数。

返回值

NULL.

错误／异常

Throws MongoConnectionException if it cannot reach the database.

更新日志

版本	说明
1.2.11	Emits `E_DEPRECATED` when used.

范例

Example #1 MongoCursor::doQuery() example

You could override this function to attempt a query on a secondary and, if that fails, try it again on the primary.


<?php

class MyCursor extends MongoCursor {

    protected function doQuery() {

        $this->slaveOkay();

        try {
            MongoCursor::doQuery();
        }
        catch(MongoCursorException $e) {
            $this->slaveOkay(false);
            MongoCursor::doQuery();
        }
    }
}

?>