dynamodb tutorial link

https://www.youtube.com/watch?v=IT1X42D1KeA&t=3965s

dynamoDb query list

list table
------------------------
var params={};
dynamodb.listTables(params,function(error,data){
    if(error)
    {
        console.log(error);
    }
    else
    {
        console.log(data);
        data.TableNames.forEach((t)=>{
           console.log(t);
        });
    }
 
});
-----------------------------------------------------
Create Table

var params={
 
    TableName:"TestData",
    AttributeDefinitions:[
         {
        AttributeName:"salary",
        AttributeType:"S"
        },
        {
        AttributeName:"empid",
        AttributeType:"S"
        }
        ],
         KeySchema:[
            {
                AttributeName: "empid",
                KeyType: "HASH"
            },
            {
              AttributeName:"salary" ,
              KeyType:"RANGE"
            }
         
            ],
         
    ProvisionedThroughput:{
        ReadCapacityUnits: 5,
        WriteCapacityUnits: 5
     
    }
};

dynamodb.createTable(params,function(error,data){
    if(error)
    {
       console.log(error);
    }
    else{
        console.log(data);
    }
 
});
----------------------------------------------------------
Get Table information
--------------------------
dynamodb.describeTable(params,function(error,data){
    if(error)
    {
        console.log(error);
    }
    else
    {
        console.log(data);
    }
   
});
---------------------------------------
Get All Table records.
params={
    TableName:"TestData"
};
docClient.scan(params,function(error,data){
    if(error)
    {
        console.log(error);
    }
    else
    {
        console.log(data);
    }
   
});
----------------------------------------------------
Put Item in dynamodb table
---------------------------------
params={
    TableName:"TestData",
    Item:{
        "empid":"1002","empname":"nagendra","salary":"60000"
    }
};
docClient.put(params,function(error,data){
    if(error)
    {
        console.log(error);
    }
    else
    {
        console.log(data);
    }
   
});

dynomodb local

http://www.isostech.com/blogs/software-development/develop-locally-use-dynamodb-local/

java -Djava.library.path=./DynamoDBLocal_lib -jar DynamoDBLocal.jar -sharedDb -port 8888

event emitter

var EventEmitter = require("events").EventEmitter;

var ee = new EventEmitter();

ee.on("someEvent", function () { console.log("event 1");
for(var i=0;i<101;i<i++)
{
  console.log(i);
}
 
});
ee.on("one", function () { console.log("event 2"); });
ee.on("two", function () { console.log("event 3"); });
ee.on("three", function () { console.log("event 4"); });
ee.on("four", function () { console.log("event 5"); });
ee.on("five", function () { console.log("event 6"); });
ee.on("six", function () { console.log("event 7"); });
ee.on("seven", function () { console.log("event 8"); });
ee.on("someEvent", function () { console.log("event 9"); });
ee.on("someEvent", function () { console.log("event 10"); });
ee.on("someEvent", function () { console.log("event 11"); });

ee.emit("one");
ee.emit("two");
ee.emit("three");
ee.emit("four");
ee.emit("five");
ee.emit("six");
ee.emit("seven");
ee.emit("someEvent");

link https://repl.it/repls/ColossalTrueZebratailedlizard

aws dynamodb Query link

https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_Query.html

object manupulation

data.forEach((x)=>{
if(x.city=="BARRE"){
let o=data.indexOf(x);
let oo=data.splice(0,0,x);
console.log(oo);
console.log(o);
console.log(x.city);
}
})
data.forEach((x)=>{
if(x.city=="BARRE"){
let o=data.indexOf(x);
delete data[o];
data.unshift(x);

}
})
//write code for first element

let data=[{ "city" : "AGAWAM", "loc" : [ -72.622739, 42.070206 ], "pop" : 15338, "state" : "MA", "_id" : "01001" },
{ "city" : "CUSHMAN", "loc" : [ -72.51564999999999, 42.377017 ], "pop" : 36963, "state" : "MA", "_id" : "01002" },
{ "city" : "BARRE", "loc" : [ -72.10835400000001, 42.409698 ], "pop" : 4546, "state" : "MA", "_id" : "01005" },
{ "city" : "BELCHERTOWN", "loc" : [ -72.41095300000001, 42.275103 ], "pop" : 10579, "state" : "MA", "_id" : "01007" },
{ "city" : "BLANDFORD", "loc" : [ -72.936114, 42.182949 ], "pop" : 1240, "state" : "MA", "_id" : "01008" },
{ "city" : "BRIMFIELD", "loc" : [ -72.188455, 42.116543 ], "pop" : 3706, "state" : "MA", "_id" : "01010" },
{ "city" : "CHESTER", "loc" : [ -72.988761, 42.279421 ], "pop" : 1688, "state" : "MA", "_id" : "01011" }]

aws cloud search with aws api getway

http://aaronkenny.com/blog/using-aws-api-gateway-to-enable-cors-for-cloud-search/index.htm