gormssp

Using Datatables pagination with golang

Pre-requisites 📋

This package use the new version of gorm in https://github.com/go-gorm/gorm, for previous version, go to https://github.com/juaismar/gormssp

Database compatible: Postgres (stable), SQLite (without REGEXP)

• Obviously use it in a golang project
• Gorm package (https://gorm.io/) (https://github.com/go-gorm/gorm)
• Beego package (https://beego.me/) (https://github.com/astaxie/beego)

Installation 🔧

Install with the next command:

go get github.com/juaismar/go-gormssp

and import the package with:

import ("github.com/juaismar/go-gormssp")

Working example 🚀

A working example on https://github.com/juaismar/go-GormSSP_Example

-This is a simple code that sends data to the Datatables JS client.

import ("github.com/juaismar/go-gormssp")

func (c *User) Pagination() {

  // Array of database columns which should be read and sent back to DataTables.
  // The `db` parameter represents the column name in the database, while the `dt`
  // parameter represents the DataTables column identifier. In this case simple
  // indexes but can be a string
  // Formatter is a function to customize the value of field , can be nil.
  columns := []SSP.Data{
    SSP.Data{Db: "name", Dt: 0, Formatter: nil},
    SSP.Data{Db: "role", Dt: 1, Formatter: nil},
    SSP.Data{Db: "email", Dt: 2, Formatter: nil},
  }

  // Send the data to the client
  // "users" is the name of the table
  c.Data["json"], _ = SSP.Simple(c, model.ORM, "users", columns, nil)
  c.ServeJSON()
}

-This is an example of data formatting.

SSP.Data{Db: "registered", Dt: 3, Formatter: func(
  data interface{}, row map[string]interface{}) (interface{}, error) {
  //data is the value id column, row is a map whit the values of all columns
  if data != nil {
    return data.(time.Time).Format("2006-01-02 15:04:05"), nil
  }
  return "", nil
}}

-This is a complex example.

import ("github.com/juaismar/go-gormssp")

func (c *User) Pagination() {
    columns := []SSP.Data{
      SSP.Data{Db: "id", Dt: "id", Formatter: nil},
    }
	
    //whereResult is a WHERE condition to apply to the result set
    //whereAll is a WHERE condition to apply to all queries
    var whereResult []string
    var whereAll []string
    var whereJoin = make([]SSP.JoinData, 0)
    whereAll = append(whereAll, "deleted_at IS NULL")

    c.Data["json"], _ = SSP.Complex(c, model.ORM, "events", columns, whereResult, whereAll, whereJoin, nil)
    c.ServeJSON()
}

-Fields with spaces in the name or start whit numbers must be escaped.

SSP.Data{Db: "\"1My special table\"", Dt: 3, Formatter: nil}

-Can implement functions in search, example:accent insensitive search

SELECT * FROM users WHERE f_unaccent(name) LIKE '%maria%';.

can be implemented as:

SSP.Data{Db: "name", Dt: 2, Formatter: nil, Sf: "f_unaccent(name)"}

Added a new option param to pass data to dialect files. in case of bigquery, must pass a info like this

opt := make(map[string]interface{})
	var tableInfo = make(map[string]map[string]string)

	tableInfo["users"] = map[string]string{
		"Dataset":   "prueba",
		"TableName": "users",
	}
	tableInfo["pets"] = map[string]string{
		"Dataset":   "prueba",
		"TableName": "pets",
	}

	opt["TableInfo"] = tableInfo

Functions added when you have a custom code that only want data: DataSimple DataComplex ReaderSimple ReaderComplex

-This project is based in the PHP version of datatables pagination in https://datatables.net/examples/data_sources/server_side -Original file can be found in https://github.com/DataTables/DataTables/blob/master/examples/server_side/scripts/ssp.class.php

Important

If you are using Bigquery must set env var LW_DATASET to your dataset

Author ✒️

• Juan Iscar - (https://github.com/juaismar)

Thanks 🎁

• All my friends at work.
• Sergio(https://github.com/serveba) and Mario (https://github.com/mapreal19) who taught me how to program golang and showed me the wonderful world of good practices.
• Juan, Juan and Joaquin.

Readme.md based in https://gist.github.com/Villanuevand/6386899f70346d4580c723232524d35a