Question

我想从文档中删除信息但代码运行且没有错误发生。但它不会删除记录。我喜欢这样的数据

{       
  "id": "12345",
   "info": [
    {
        "sno":1
        "name": "XYZ",
        "email": "xyz@example.com"
    },
    {
        "sno":2
        "name": "XYZ",
        "email": "xyz@example.com"
    }
  ]      
}

我要删除id = 12345和info.sno = 2的数据我的PHP代码ID

<?
     $m=new Mongo();
     $db=$m->database;
     $cond=array("id"=>'12345');
     $data=array('$pull'=>array("info.sno"=>2));
     //I used before this $data=array('$pull'=>array("info"=>array("sno"=>2)));
     echo json_encode($data);
     $db->info->update($cond,$data);
     $st=$db->Command(array("getlasterror"=>1));
?>

我运行mongo db命令，如：

    db.info.update({"id":12345},{'$pull':{"info":{"sno":2}}});

Answer 1

您的注释掉的行是正确的：

test> db.foo.findOne()
{
    "_id" : ObjectId("4f74737cc3a51043d26f4b90"),
    "id" : "12345",
    "info" : [
            {
                    "sno" : 1,
                    "name" : "XYZ",
                    "email" : "xyz@example.com"
            },
            {
                    "sno" : 2,
                    "name" : "XYZ",
                    "email" : "xyz@example.com"
            }
    ]
}
test> db.foo.update({"id":"12345"}, {"$pull":{info:{sno:2}}})
test> db.foo.findOne()
{
    "_id" : ObjectId("4f74737cc3a51043d26f4b90"),
    "id" : "12345",
    "info" : [
            {
                    "sno" : 1,
                    "name" : "XYZ",
                    "email" : "xyz@example.com"
            }
    ]
}

如何使用php在mongodb中使用pull

1 个答案: