#CacheJSORM

A JavaScript ORM with caching and connection pooling support. It supports CRUD operations and aggeration(group, order, outer join, left join, right join, inner join, top, limit for mysql, max, min, sum, count) for mssql, mysql and postgres.

After installing this package;

1. Create a model with table and field details.

   var table = require('cachejsorm').TableSchema
   var tableMapping = require('cachejsorm').TableMapper
   var mssqlTable ='dbo.[orders]';
   var schema = new table(
       {
           OrderNumber: {type: Number}, 
           orderDate: {type: String}, 
           customerNumber:{type:Number},
       }
   );
   var tabModel = new tableMapping(mssqlTable, schema);
   module.exports=tabModel;`
   
   

2. Create a test.js

   1. Call model in test.js
   2. Setup connection details
   3. Use functions from package for CRUD, join and aggregate functions.

Refer to following examples;

var orderModel = require('./testmodel')
//setup configuration
var config={    
    driverType: "mssql",    //supports mysql/mssql/pg    
    server:'serverip',
    database:'databasename',
    port: 1433,
    username:'username',
    password: 'password',
    cacheDuration: 10,      //duration in seconds
    driverOptions:{
        connectionPoolLimit: 10,
        //trustedConnection: false  //true for integrated security
    }
}
orderModel.setConfig(config);

#####CRUD Operation

//find based on column values 
orderModel.find({OrderNumber: '123'},function(err,data){
    if(err){
        console.log(err);
    }else{
        console.log(data);
    }
});

//find all
orderModel.find({},function(err,data){
        if(err){
            res.send(err);
        }else{
            res.send(data);
        }
    });

//delete 
orderModel.delete({OrderNumber:1234},function(err,data){
        if(err){
            res.send(err);
        }else{
            res.send(data);
        }
    });

//Update (keyfields, field key value to update)
orderModel.update({OrderNumber:1234},{OrderQuantity: 2, customerNumber: 111},function(err,data){        
        if(err){
            res.send(err);
        }else{
            res.send(data);
        }
    });

//insert
orderModel.insert({OrderQuantity:1, orderDate:'2019-01-01', customerNumber:111},function(err,data){
        if(err){
            res.send(err);
        }else{
            res.send(data);
        }
    });

#####Join Conditions (join types inner, outer, left and right)

// use .join for joining multiple tables
orderModel.join(
    {
        _join: [{
            _localkey: 'customerid',
            _foreignkey: 'id',
            _foreignTable: 'dbo.[customer]',
            _type: 'inner',
            _name: '$join1'     //create multiple joins with same table and name them to reference later
        },
        {
            _localkey: 'id',
            _foreignkey: 'OrderId',
            _foreignTable: 'dbo.[OrderItem]',
            _type: 'left',
            _name: '$join2'     //create multiple joins with same table and name them to reference later
        }],
        _field: 
                [
                    {
                        _name: '_local.OrderNumber',
                        _alias: 'OrderNum',
                    },
                    {
                        _name: '_foreign.FirstName',    //fields to retrieve for first join 
                        _alias: 'CustomerName',
                        _join: '$join1'
                    },
                    {
                        _name: '_foreign.all',  //get all fields from second join 
                        _join: '$join2'
                    }
                ],
        _filter: [      //additional filters on joins 
            {
                _field:[{_name:'_foreign.id', _join: '$join1'}],
                _eq:'85'    //equal
            },
            {
                _field:[{_name:'_local.TotalAmount'}],
                _gteq:'400'     //greater than equal
            }
        ],
        _order: {
            _field: 
                [
                    {
                        _name: '_local.OrderNumber',
                    },
                    {
                        _name: '_foreign.FirstName',
                        _join: '$join1'
                    }
                ],
            _mode: 'desc'
        },
        _top:{_row:2}   //use _limit for driver type mysql
    },
    function(err,data){
        if(err){
            console.log(err);
        }else{
            console.log(data);
        }
    }
)

Above function produces following SQL Query internally to retrieve from DB;

SELECT  top 2 orders.OrderNumber as OrderNum ,dbo.[customer].FirstName as CustomerName ,dbo.[OrderItem].* 
FROM orders 
INNER JOIN dbo.[customer] ON orders.customerid=dbo.[customer].id 
LEFT JOIN dbo.[OrderItem] ON orders.id=dbo.[OrderItem].OrderId  
Where dbo.[customer].id = 85 
and orders.TotalAmount >= 400  
Order By orders.OrderNumber, dbo.[customer].FirstName desc

#####Aggregate Operations (_sum, _count, _max, _min)

//Use .aggregate for _sum , _count, _max and _min functions
orderModel.aggregate(
    {
        _sum:{
            _field: 'TotalAmount',
            _alias: 'MaxAmount'
        },
        _group: {
                _by: {
                    _field: [{_name:'customerId'}]
                },
                _having:{
                    _field:[{_name:'customerId'}],
                    _eq:'10'
                }
            }
        }
    ,function(err,data){
        if(err){
            console.log(err);
        }else{
            console.log(data);
        }
});

Above function produces following SQL Query internally;

SELECT sum(TotalAmount) as MaxAmount FROM orders group by customerId HAVING customerId = 10

orderModel.aggregate(
    {
        _sum:{
            _field: 'TotalAmount',
            _alias: 'MaxAmount'
        },
        _group: {
                _by: {
                    _field: [{_name:'customerId'}]
                },
                _having:{
                    _max: {
                        _field: 'TotalAmount'
                    },
                    _gt: '500'  //greater than
                }
            }
        }
    ,function(err,data){
        if(err){
            console.log(err);
        }else{
            console.log(data);
        }
});

Above function produces following SQL internally;

SELECT sum(TotalAmount) as MaxAmount FROM orders group by customerId HAVING  max(TotalAmount) > 500

3. run node test.js

Note: Latest version has a fix for returning id post insert query for SQL Server.