MongoCommandCursor::rewind
(PECL mongo >=1.5.0)
MongoCommandCursor::rewind — Executes the command and resets the cursor to the start of the result set
说明
public MongoCommandCursor::rewind
( void
) : array
If the cursor has already started iteration, the command will be re-executed.
参数
此函数没有参数。
返回值
The raw server result document.
错误／异常
Throws MongoConnectionException if it cannot reach the database and MongoCursorTimeoutException if the timeout is exceeded.
Throws MongoCursorException if the cursor was created with MongoCommandCursor::createFromDocument() and has already started iteration. Such cursors cannot be iterated multiple times, as they lack the original command necessary for re-execution.
范例
Example #1 MongoCommandCursor::rewind()
<?php
$rawResult = $commandCursor->rewind();
// Command cursor is now reset to the start of the result set
var_dump($rawResult);
?>
以上例程的输出类似于：
array(2) {
["cursor"]=>
array(3) {
["id"]=>
object(MongoInt64)#5 (1) {
["value"]=>
string(12) "310050110216"
}
["ns"]=>
string(9) "demo.test"
["firstBatch"]=>
array(1) {
[0]=>
array(2) {
["_id"]=>
object(MongoId)#6 (1) {
["$id"]=>
string(24) "52f5691544670a8077b0dc51"
}
["value"]=>
string(2) "42"
}
}
}
["ok"]=>
float(1)
}
参见
- Iterator::rewind() - 返回到迭代器的第一个元素
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