Caché Transact-SQL (TSQL) Migration Guide - InterSystems ...

1OverviewCaché TSQL is an implementation of Transact-SQL which supports many of the features of both the Microsoft and Sybaseimplementations. Transact-SQL is used with Microsoft SQL Server (MSSQL) and Sybase Adaptive Server.Caché TSQL also contains a few proprietary extensions not found in either of these implementations. These are describedin the Commands chapter.This document will help you to quickly migrate schemas and stored procedures from Microsoft or Sybase databases andit will provide you with an understanding of the TSQL (Transact-SQL) implementation in Caché.1.1 Getting StartedTo migrate existing TSQL applications to Caché TSQL, you need to perform three operations: configure Caché for TSQL,migrate the TSQL source code, and migrate the data.1.1.1 Configuring TSQLTo configure your system for TSQL:• Go into the Caché Management Portal. Go to [System] > [Configuration] > [SQL Settings], then select TSQL CompatibilitySettings. Here you can specify the dialect (Sybase or MSSQL), and turn on or off the ANSI_NULLS, CASEINSCOMPARE,and QUOTED_IDENTIFIER settings. The default for all three is “off”. These values are used to set the^%SYS(“tsql”,”SET”,...) global array values.• In the Management Portal, select [System] > [Configuration] > [SQL Settings] > [General SQL Settings], then set theDefault SQL Schema Name. This will be the destination schema (which maps to a package) for all unqualified DDLentities.• In the Management Portal, select [System] > [Configuration] > [SQL Settings], the select User-defined DDL Mappings tomap any needed user data types.1.1.2 Migrating Source CodeThe initial application migration is simple:1. Migrate the DDL: Import table and view definitions using the DDLImport() method of the %SYSTEM.SQL. class.Set this method's DDLMode parameter to either "MSSQLServer" or "Sybase". For further details, see the CachéClass Reference.Caché Transact-SQL (TSQL) Migration Guide 3