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AWS Lambda – Function in Go

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  Go Language support is a recent addition to AWS. To work with Go, you need to select the language from AWS console while creating the AWS Lambda function. In this chapter, let us learn in detail about AWS Lambda function in Go language. Installing Go To get started we need Go Language support. In this section, we will go through following details to start working with AWS Lambda in Go. This is the official site for Go download:  https://golang.org/dl/ Now, download the package as per the operating system. Follow the procedure given here to install Go on the respective operating system. Installation on Windows Observe that for Windows, there is 32-bit and 64-bit download available. Download the zip file and extract the contents and store it in a directory of your choice. Add the environment variables available at  ControlPanel ---> System ---> Advanced system settings. Now, click  Environment Variables  button and add the directory path as shown here − Yo...
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SQL - Indexes

  Indexes are   special lookup tables   that the database search engine can use to speed up data retrieval. Simply put, an index is a pointer to data in a table. An index in a database is very similar to an index in the back of a book. For example, if you want to reference all pages in a book that discusses a certain topic, you first refer to the index, which lists all the topics alphabetically and are then referred to one or more specific page numbers. An index helps to speed up  SELECT  queries and  WHERE  clauses, but it slows down data input, with the  UPDATE  and the  INSERT  statements. Indexes can be created or dropped with no effect on the data. Creating an index involves the  CREATE INDEX  statement, which allows you to name the index, to specify the table and which column or columns to index, and to indicate whether the index is in an ascending or descending order. Indexes can also be unique, like the  UNIQU...
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AWS Lambda – Function in Java

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Creating JAR file in Eclipse Before proceeding to work on creating a lambda function in AWS, we need AWS toolkit support for Eclipse. For any guidance on installation of the same, you can refer to the  Environment Setup  chapter in this tutorial. Once you are done with installation, follow the steps given here − Step 1 Open Eclipse IDE and create a new project with  AWS Lambda Java Project . Observe the screenshot given below for better understanding − Step 2 Once you select  Next , it will redirect you the screen shown below − Step 3 Now, a default code is created for Input Type  Custom . Once you click  Finish  button the project gets created as shown below − Step 4 Now, right click your project and export it. Select  Java / JAR  file from the  Export  wizard and click  Next . Step 5 Now, if you click  Next , you will be prompted save the file in the destination folder which will be asked when you click on next. Once the...
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