MongoDB::lastError

(PECL mongo >=0.9.5)

MongoDB::lastError — Check if there was an error on the most recent db operation performed

说明

public array MongoDB::lastError ( void )

This method is equivalent to:

  <?php

 public function  lastError () {
    return  $this -> command (array( 'getlasterror'  =>  1 ));
}

 ?>

参数

此函数没有参数。

返回值

Returns the error, if there was one.

范例

Example #1 MongoDB::lastError() NULL error example

  <?php
$db -> resetError ();
 var_dump ( $db -> lastError ());
 ?>

以上例程的输出类似于：

array(3) {
  ["err"]=>
  NULL
  ["n"]=>
  int(0)
  ["ok"]=>
  float(1)
}

Example #2 MongoDB::lastError() duplicate key example

  <?php
$c  =  $db -> selectCollection ( "foo" );

 // insert two documents with the same _id
 $c -> insert (array( "_id"  =>  1 ));
 $c -> insert (array( "_id"  =>  1 ));

 var_dump ( $db -> lastError ());
 ?>

以上例程的输出类似于：

array(3) {
  ["err"]=>
  string(64) "E11000 duplicate key errorindex: foo.foo.$_id_  dup key: { : 1 }"
  ["n"]=>
  int(0)
  ["ok"]=>
  float(1)
}

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