Basemongo base class Design

To further improve the application of the framework, this series of articles mainly introduces how to improve the architecture function, and how to use the architecture to do some specific application development. This series of courses can be found on GitHub, and links will be provided in each article.

This presentation is mainly about the design of the MONGO base class and its application. Please see the link below to download http://5xpan.com/fs/7hueanfgd6h350fe4/(download link has the benefit, please forgive have advertisement).
If you don't want to slow down, you can go straight to GitHub (HTTPS://GITHUB.COM/TNODEJS/BASEMONGODB)

Main function Structure Private method connection

The function is primarily to create a mongodb link and to cache the linked object.

 function connection(TableName, callback){        varConnect_url = Get_db_connect_url ();if(db_tmp[' DB ']) {db_tmp[' DB '].collection (TableName, function(err, collection){                if(ERR) {Console.log (' Basemongo can not connection with DB table error '); Process.Exit(1);            } callback (collection); });return; } mongoclient.connect (Connect_url, {native_parser:true}, function(err, db) {            if(ERR) {Console.log (' Basemongo can not connection with DB '); Process.Exit(1); } db_tmp[' DB '] = db;if(!tablename) {return; } db.collection (TableName, function(err, collection){                if(ERR) {Console.log (' Basemongo can not connection with DB table error '); Process.Exit(1);            } callback (collection);        });    }); }

This method calls the Get_db_connect_url method in this base class, primarily to get the DB connection character.

Get_db_connect_url

Gets the link string for the db, which is called primarily by connection.

functionGet_db_connect_url () {/*varDbconfig = Library.getconfig (' MongoDB ',' DB ');varHost = dbconfig[' Host '], port = dbconfig[' Port '], DbName = dbconfig[' db_name '], user = dbconfig[' user '], password = dbconfig[' Password ']; */varHost =' localhost ';varPort =' 27017 ';varuser ="';varPassword ="';varDbName =' Test_book ';if(!user &&!password) {return "mongodb://"+ Host +":"+ Port +"/"+ DbName; }return "mongodb://"+ user +":"+ Password +"@"+ Host +":"+ Port +"/"+ DbName; }

The method should read the configuration file, this part for the sake of easy to write directly in the function, readers use, use the Read configuration method to obtain.

Filter_options

For some basic operations in the query function sort, limit and skip to do a filter, unified processing logic.

 function filter_options(){        varFields =arguments[0] ?arguments[0] :NULL;varLimit =arguments[1] ?arguments[1] :0;varSort =arguments[2] ?arguments[2] :NULL;varSkip =arguments[3] ?arguments[3] :0;varoptions = {};if(Limit!==0) {options.limit = limit; }if(Skip!==0) {Options.skip = skip; }if(Fields)        {options.fields = fields; }if(sort)        {options.sort = sort; } options.timeout = timeout;returnOptions }

Get_result

Because MongoDB's base library returns very much data, this part is to do a layer of processing the data returned after the MongoDB operation, so that the outer call can clearly know the return result information.

/** * @desc to the MongoDB library back to do filter * * /function Get_result (Result) {if(!result[' Result ']){return false; }if(result[' Result '][' OK '] !=1){return false; }if(result[' Result '][' n '] <1){return false; }return true; }

Public method initconnecnt

This method initializes the MongoDB link object. In general, it is not necessary to call the function, but in special cases, the function can compensate for some of the simultaneous multiple requests caused by the bug problem. Specific words can be referred to my previous article, "node. js execution flowchart triggered thinking"

   /**     * @desc 初始化mongodb的连接对象     *     */    this.initConnecnt = function(){        connection(false, function(db){            DB_TMP[‘db‘] = db;        });    }

FindOne

Querying a single data record, returning only a single piece of data, and if no data is found to return null, the exception prints the error message and returns FALSE.

Parameter name	parameter Type	parameter Description	parameter Examples
TableName	String	Table name of the action	Book
Condition	Json	Query criteria	{' name ': 1}
Fields	Json	The Returned field	{' _id ': 1, ' name ': 1}

For an example of a method, refer to Findone.js in source example

Find

Querying multiple data records, if no data is found to return null, the exception prints the error message and returns FALSE.

Parameter name	parameter Type	parameter Description	parameter Examples
TableName	String	Table name of the action	Book
Condition	Json	Query criteria	{' name ': 1}
Callback	function	callback function	function (err, result) {}
Fields	Json	The Returned field	{' _id ': 1, ' name ': 1}
Limit	Int	Returns the number of bars	5
Skip	Int	Number of skipped bars	5
Sort	Json	Sort fields	{' name ': 1}

Insert

Inserts multiple data, returning the inserted data list.

Parameter name	parameter Type	parameter Description	parameter Examples
TableName	String	Table name of the action	Book
Rowinfos	Array	Array of data inserted	[{' name ': ' Danhuang '}]
Callback	function	callback function	function (err, result) {}

Save

Inserts a single piece of data, returning the MONGO ID of the inserted data.

Parameter name	parameter Type	parameter Description	parameter Examples
TableName	String	Table name of the action	Book
Rowinfo	Json	The inserted data	{' name ': ' Danhuang '}
Callback	function	callback function	function (err, result) {}

Remove (Findandremove)

Delete data, delete a single, or delete all eligible. The parentheses are queried and deleted.

Parameter name	parameter Type	parameter Description	parameter Examples
TableName	String	Table name of the action	Book
Condition	Json	Query criteria	{' name ': 1}
RemoveAll	Boolean	Delete all	True
Callback	function	callback function	function (err, result) {}

Update (findandmodify)

Updates a single piece of data, in parentheses, for query and modification.

Parameter name	parameter Type	parameter Description	parameter Examples
TableName	String	Table name of the action	Book
Condition	Json	Query criteria	{' name ': 1}
Rowinfo	Json	The inserted data	{' name ': ' Danhuang '}
Update_set	Boolean	Whether to update locally	True
Callback	function	callback function	function (err, result) {}

UpdateAll

Update more than one data.

Parameter name	parameter Type	parameter Description	parameter Examples
TableName	String	Table name of the action	Book
Condition	Json	Query criteria	{' name ': 1}
Rowinfo	Json	The inserted data	{' name ': ' Danhuang '}
Update_set	Boolean	Whether to update locally	True
Callback	function	callback function	function (err, result) {}

Count

Query the number of data that meets the criteria.

Parameter name	parameter Type	parameter Description	parameter Examples
TableName	String	Table name of the action	Book
Condition	Json	Query criteria	{' name ': 1}
Callback	function	callback function	function (err, result) {}

Example describes the data-tier action class

The class can be directly used as a data-tier operation class, and developers can invoke the module directly for development, such as the following code.
Data Insertion Example

Ar Basemongo =require('./basemongo ');varBasemongo =NewBasemongo ();varRowinfos = [{' name ':' Mongo2 ',' Test_url ':' http://blog.lovedan.cn ',' Download_book ':' http://download.lovedan.cn ',' Create_time ':New Date()    },    {' name ':' Mongo3 ',' Test_url ':' http://blog.lovedan.cn ',' Download_book ':' http://download.lovedan.cn ',' Create_time ':New Date()}];basemongo.insert (' book ', Rowinfos, function(Result){    if(false= = = result) {Console.log (' Insert error '); }Else{Console.log (result); }});

Sample Data Query

/* condition fields */var condition = {‘test_url‘‘http://blog.lovedan.cn‘};var fields    = {"create_time":0};/* test for find rowinfo */basemongo.find(‘book‘function(result){    if(false === result){        console.log(‘find error‘);    else {        console.log(result);    }}, fields);

And so on, please check the source code for the test.

As a base class

Of course, the module can also be used as a base class, providing other module layer class calls, as a parent class method, as shown in the example code below.

/** * * @type class * @author Danhuang * @time 2015-04-07 * @desc is mainly used for new book data */< /c0>varModel =require('. /.. /basemongo ');varSYS =require(' util '); function book(){    var_self = this;var_tablename =' T_book ';    Model.call (_self);    Sys.inherits (_self, Model); THIS.ADDDATAINDB = function(Rowinfo, callback){_self.save (_tablename, Rowinfo, function(ret){            if(ret)            {Callback (ret); }Else{Callback (false);    }        }); };}varBook =NewBook (); exports.adddataindb = book.adddataindb;

Then the above module layer class, can be directly called by the controller layer or other module layer, such as the downward use of the method.

varBook =require('./model_extended/book ');varRowinfo = {' name ':' node. js book ',' Author ':' Danhuang ',' desc ':' Good book ',' catalogue ': [' 1 ',' 2 '],' content ':' DASADASDASDASD ',' cover ':' http://blog.lovedan.cn ',' Pic_urls ':' http://download.lovedan.cn ',' Category_ids ': [' 1 ',' 2 '],' Pdf_url ':' http://download.lovedan.cn ',' Download_url ':' http://download.lovedan.cn ',' Download_tips ':' dddd ',' Buy_list ':' http://blog.lovedan.cn '};book.adddataindb (Rowinfo, function(ret){Console.log (ret);});

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Basemongo base class Design