Inside Macintosh: Interapplication Communication /

Chapter 12 - Data Access Manager

Using the Data Access Manager

There are at least three different ways in which you can use the Data Access Manager to communicate with a data source. You can

• use low-level interface routines to send queries and retrieve data from the data source. In this case, your application must be capable of preparing a query in a language appropriate for the data server.
• use high-level interface routines to send queries and retrieve data from the data source. In this case, you must have one or more query documents provided by another application.
• create your own query documents and use high-level interface routines to send queries and retrieve data from the data source. In this case, your application must be capable of preparing a query, but it can use the same query repeatedly once it has been prepared.

This section describes how to use the high-level and low-level interfaces to the Data Access Manager to send queries to a data server. This section also describes how to call Data Access Manager functions asynchronously, how to determine the status of the high-level functions at various points in their execution (and cancel execution if you so desire), how to obtain information about Data Access Manager sessions that are in progress, and how to retrieve query results and convert them to text.

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Subtopics

Executing Routines Asynchronously

General Guidelines for the User Interface

Using the High-Level Interface

Writing a Status Routine for High-Level Functions

Using the Low-Level Interface

Getting Information About Sessions in Progress

Processing Query Results