MongoCursor::awaitData

(PECL mongo >=1.2.11)

MongoCursor::awaitData — Sets whether this cursor will wait for a while for a tailable cursor to return more data

说明

public MongoCursor::awaitData ([ bool $wait = TRUE ] ) : MongoCursor

This method is to be used with tailable cursors. If we are at the end of the data, block for a while rather than returning no data. After a timeout period, we do return as normal.

参数

wait: If the cursor should wait for more data to become available.

返回值

Returns this cursor.

错误／异常

Throws MongoCursorException if this cursor has started iterating.

范例

Example #1 MongoCursor::awaitData() example

In this example we tail the "oplog" and instead of sleeping during every iteration, we set the MongoCursor::awaitData() option. MongoCursor::hasNext() will now block until there is more data available.


<?php
$m = new MongoClient( 'mongodb://localhost:13000', array( 'replSet' => 'seta' ) );
$c = $m->local->selectCollection( 'oplog.rs' );
$cursor = $c->find( array( 'ns' => 'demo.article', 'op' => 'i' ) );
$cursor->tailable( true );
$cursor->awaitData( true );

while (true) {
    if (!$cursor->hasNext()) {
        // we've read all the results, exit
        if ($cursor->dead()) {
            break;
        }
    } else {
        var_dump( $cursor->getNext() );
    }
}
?>

参见

MongoDB core docs on » tailable cursors.

MongoCursor::tailable() - Sets whether this cursor will be left open after fetching the last results

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官方地址：https://www.php.net/manual/en/mongocursor.awaitdata.php

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MongoCursor::awaitData

说明

参数

返回值

错误／异常

范例

参见

User Contributed Notes