MongoDB related operations

1. Connect to MongoDB

<? php
     // 1. Connect to MongoDB 
    $host = "127.0.0.1" ;
     $port = 27017 ;
     $server = "mongodb:// $host : $port " ;
     $mongodb = new MongoClient( $server );
     echo "<pre>" ;
     var_dump ( $mongodb );
     // 2. Select database 
    $db = $client -> hytc;
     var_dump ( $db );
     // 3. Select data table 
    $collection =$db -> user;
    var_dump($collection);

Note: libraries and tables do not need to be created manually, they are created automatically after selection

2. CRUD operations

insert (data)　　insert data (must be an array)

 

　　//插入文档（关联数组）
　　$data = ["name"=>"小明","age"=>10,"hobby"=>"swim"];
　　$result = $collection -> insert($data);
　　echo "<pre>";var_dump($result);
　　

 

find (find conditions, find fields)　　query data

 

    // Query data (returns cursor cursor, resource) 
    $condition = ['name'=>'Xiao Ming' ];
     $fields = [
         '_id' => false ,      // Do not query id 
        'name' => true ,      // query name 
        'hobby' => true      // query hobby 
    ];
     $result = $collection -> find( $condition , $fields );
     foreach ( $result  as  $key => $value ){
         echo "<pre> " ;
        var_dump($value);
    }

update (find condition, content after update => document content)　　update data

 

    // Update data 
    $condition = ['name'=>'Xiao Ming' ];
     $new_doc = [
         '$set' => ["hobby" => "swim" ]
    ];
    $result = $collection -> update($condition,$new_doc);
    echo "<pre>";
    var_dump($result);

 

Note:

• If the hobby field does not exist, create the field
• The default update does a replacement operation, which can be modified instead of replaced by the attribute modifier
• If multiple records meet the update conditions, only the first data will be updated by default
• To update all records that meet the update conditions, set the third parameter of this function: ["multiple"=>true]

      //更新数据
      $condition = ['age'=>'20'];
      $new_doc = [
          '$set' => ["hobby" => "swim"]
      ];
      $result = $collection -> update($condition,$new_doc,['multiple'=>true]);
      echo "<pre>";
      var_dump($result);

 

remove (find condition)　　delete data

 

    // Delete data 
    $condition = ['name'=>'Xiao Ming' ];
     $result = $collection -> remove( $condition );