Matthew Setter has posted the third part of his series looking at the Zend Framework 2's DbSqlSelect component and its use. In this latest (and last) tutorial, he talks more specifically about columns, limiting and ordering.
Welcome to the third and last part in this series, introducing you to working with the ZendDbSqlSelect classes in Zend Framework 2. In part one we looked at building SQL Where clauses using the where related functions, predicates and closures, as well as compound queries. In part 2, we looked at all forms of SQL joins as well as a slightly more esoteric feature of SQL – UNIONS. Here, in part 3, in the words of Coldplay, we’re going back to the start, and looking at the fundamentals.
He looks at three specific elements - the class constructor, the "limit" and "order" functions and the "Expression" class. He includes sample code showing how to create the class - one normally and one bound to a specific table. The next example shows how to define the columns to be selected using the "select" method. Finally, he shows the use of the "Expression" objects to perform SQL operations in the query (like "COUNT").