About SimpDDB

Main Features

• Intended so a JavaScript caveperson can use it - A little bit of JSON "know how" is all you need
• Intended for a very basic set of DynamoDB operations
  • get - key + sort will return one object
  • put - will overwrite the item with a new item
  • del - will delete the item. key + sort is required, any other attributes are ignored and will not affect the operation
  • query - uses key condition experession "begins_with", key + sort is required, any other attributes are ignored and will not affect the operation.
  • batch - processes in batches of 25, if a batch fails only the requests in that batch group fail.
• Extends DynamoDB Client - AWS SDK for JavaScript v3
• Lightweight
• Intended to bring a smile

Other info

• All ddb tables must have "key" and "sort" as the composite key.
• All item attributes are inserted as strings into ddb by default, but, can be overwritten to store them as intended.
• undefined or "undefined" is stored as an empty string.
• null is stored as an empty string
• Currently no other DynamoDB features are supported.

How to use SimpDDB

Require it

const SimpDDB = require("simp-ddb");

Gotta have these

const TableName = "YOUR_TABLE_NAME";
const region = "us-east-1";

Credentials and Region

const ACCESS_KEY = "ASIA52IMGHBLAHBLAHBLAH";
const SECRET_ACCESS_KEY = "SqnqvvJRq+5asEyudgSv6+BLAHBLAHBLAH";
const SESSION_TOKEN = "IQoJb3JpZ2luX2VjEAYaCXVzLWVhc3QtMSJGMEQCIDslP8DeavFrEMddVERYLONGBLAHBLAHBLAH";

const clientParams = {
  "region": region,
  "credentials": {
     "accessKeyId": ACCESS_KEY,
     "secretAccessKey": SECRET_ACCESS_KEY,
     "sessionToken": SESSION_TOKEN
  }
};

const simpDDB = new SimpDDB(clientParams);

Settings

Currently storeAsStrings is the only setting available. But, if any others are added, you'll find it here.

  //By default, SimpDDB stores all item attributes as strings. To store as primitive and object values, set the following command set to false.
  simpDDB.settings({
    "storeAsStrings": false
  });

  //If set to true it will store as strings again.
  simpDDB.settings({
    "storeAsStrings": true
  });

Example put operation

(async function (){
  //put will override existing items. If you want to remove an attribute from an item use put
  await simpDDB.snd({
    "send":"put",
    "TableName":TableName,
    "key":"test",
    "sort":"test0",
    "anotherAttr":"anotherValues",
    "anotherAttrAdded":"anotherValuesAdded",
    "zeroNum":0,
    "zeroStr":"0",
    "trueBool":true,
    "trueStr":"true",
    "falseBool":false,
    "falseStr":"false",
    "object":{"one":1,"bool":false},
    "objectStr":"{\"one\":1,\"bool\":false}",
    "dateIso": new Date().toISOString(),
    "undefinedVal":undefined,
    "undefinedStr":"undefined",
    "nullVal": null
  })
  .then((data)=>{
    console.log(data);
  })
  .catch((err)=>{
    console.log(err);
  });
})();

Example upd operation

(async function (){
  // upd will create or update existing items. It will add new attributes or 
  // change the value of existing attributes, but, it will not delete attributes
  await simpDDB.snd({
    "send":"upd",
    "TableName":TableName,
    "key":"test",
    "sort":"test1",
    "anotherAttr":"anotherValues",
    "anotherAttrAdded":"anotherValuesAdded",
    "zeroNum":0,
    "zeroStr":"0",
    "trueBool":true,
    "trueStr":"true",
    "falseBool":false,
    "falseStr":"false",
    "object":{"one":1,"bool":false},
    "objectStr":"{\"one\":1,\"bool\":false}",
    "dateIso": new Date().toISOString(),
    "undefinedVal":undefined,
    "undefinedStr":"undefined",
    "nullVal": null
  })
  .then((data)=>{
    console.log(data);
  })
  .catch((err)=>{
    console.log(err);
  });
})();

Example get operation

(async function (){
  // get will return one item 
  await simpDDB.snd({
    "send":"get",
    "TableName":TableName,
    "key":"test",
    "sort":"test0",
    "consistent": true //supported by query and get operations
  })
  .then((data)=>{
    console.log(data);
  })
  .catch((err)=>{
    console.log(err);
  });
})();

Example query operation

(async function (){
  //query will return an array of items
  await simpDDB.snd({
    "send":"query",
    "TableName":TableName,
    "key":"test",
    "sort":"test",
    "condition":"begins_with",
    "consistent": true //supported by query and get operations
  })
  .then((data)=>{
    console.log(data);
  })
  .catch((err)=>{
    console.log(err);
  });
})();

Example del operation

(async function (){
  //query will return an array of items
  await simpDDB.snd({
    "send":"del",
    "TableName":TableName,
    "key":"test",
    "sort":"test0"
  })
  .then((data)=>{
    console.log(data);
  })
  .catch((err)=>{
    console.log(err);
  });
})();

Example for: "batch" operation

batchAction only supports "del", "put" operations

(async function (){
 //batch put or del
 //batchAction only supports "del", "put" operations
 //batches are processed in batch groups of 25
 const arrList = [
   {
     "batchAction":"put",
     "key":"test",
     "sort":"test2",
     "anotherAttr":"anotherValues",
     "anotherAttrAdded":"anotherValuesAdded",
     "zeroNum":0,
     "zeroStr":"0",
     "trueBool":true,
     "trueStr":"true",
     "falseBool":false,
     "falseStr":"false",
     "object":{"one":1,"bool":false},
     "objectStr":"{\"one\":1,\"bool\":false}",
     "dateIso": new Date().toISOString(),
     "undefinedVal":undefined,
     "undefinedStr":"undefined",
     "nullVal": null
   },
   {
     "batchAction":"del",
     "key":"test",
     "sort":"test1"
   }
 ];
 await simpDDB.snd({
   "send":"batch",
   "TableName":TableName,
   "batchList": arrList
 });
})();