/*

In nodejs.

While processing database by pool, don't forget release the connection.

*/

               var pool = app.mysql.pool;

                pool.getConnection(function(err, con){

                        if(err){

                                throw(err);

                        }

                        var table = web_data.table;

                        var _data = web_data.datas;

                        var map = web_data.map;



                        var query = 'update '+table+' set '+ _data +' where '+ map ;

                        console.log(query);

                        con.query(query, function(err, ret){

                                pool.releaseConnection(con);

                                if(err){

                                        throw(err);

                                }

                                return ret;

                        });

                });