The Programmers Book

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Introduction This document gives a quick introduction to the Scala language and compiler. It is intended for people who already have some programming experience and want an overview of what they can do with Scala. A basic knowledge of object-oriented Read more…


Expressions Expressions are computable statements. 1 + 1 You can output results of expressions using println. println(1) // 1 println(1 + 1) // 2 println(“Hello!”) // Hello! println(“Hello,” + ” world!”) // Hello, world! Values You can name results of Read more…


Sqoop List-Tables Command With Example This post describes how to list out the tables of a particular database in MySQL database server using Sqoop. Sqoop list-tables tool parses and executes the ‘SHOW TABLES’ query against a particular database. Thereafter, it Read more…


Sqoop List-Databases Command With Example This post describes how to list out the databases using Sqoop. Sqoop list-databases tool parses and executes the ‘SHOW DATABASES’ query against the database server. Thereafter, it lists out the present databases on the server. Read more…


Sqoop Eval Command With Example This post describes how to use the Sqoop ‘eval’ tool. It allows users to execute user-defined queries against respective database servers and preview the result in the console. So, the user can expect the resultant Read more…


Sqoop Codegen Command With Example This post describes the importance of ‘codegen’ tool. From the viewpoint of object-oriented application, every database table has one DAO class that contains ‘getter’ and ‘setter’ methods It generates DAO class in Java, based on Read more…


Apache Sqoop Job Command With Example This post describes how to create and maintain the Sqoop jobs. Sqoop job creates and saves the import and export commands. It specifies parameters to identify and recall the saved job. This re-calling or Read more…