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Data Types

SQLWindows/Team Developer data types are too different from .NET primitives and cannot be replaced automatically and safely without seriously damaging the ported application. Since SQLWindows/Team Developer was originally built as a SQL front-end system, its data types are actually more similar to ADO.NET special Sql types defined for the SQLServer client. In fact it is quite common in .NET, when dealing with SQL functionality or when building complex features, to build also specialized data types. A specialized data type is simply a class (or struct) that implements operators and casting.

In the PPJ Framework we have built a replacement for all the SQLWindows/Team Developer types. Each type is built around native .NET types and is capable of interacting seamlessly with any .NET primitive or native type, as well as any ADO.NET connection.

Nevertheless, we also port SAL types to native and primitive .NET types whenever possible and safe. For example, all constants, ActiveX/COM interfaces, and external declarations are generated using primitive and native types.

Data Types equivalence

The new types built in the PPJ Framework behave similarly to equivalent types in SQLWindows/Team Developer.

SAL Data Type

Ported Data Type

Based on .NET type

String

SalString

System.String

Number

SalNumber

System.Decimal

Date/Time

SalDateTime

System.DateTime

Boolean

SalBoolean

System.Decimal

Window Handle

SalWindowHandle

System.Windows.Forms.Control

File Handle

SalFileHandle

NA

Sql Handle

SalSqlHandle

NA

Sql Session Handle

SalSqlSessionHandle

NA

All PPJ basic types are nullable and support INullable, IComparable, IConvertible, IFormattable.