What is the Polyhedra Callback Client API?
The Callback API is one of the libraries of functions that are available for building a Polyhedra client task that accesses database tasks running either locally or remotely – see another faq for a brief description of the available libraries. The callback API allows client code coded in C or C++ to access one or more Polyhedra servers. Communication between the client and database tasks is TCP/IP or by a platform specific transport (such as OSE Messages). The Callback API supports calls for querying and updating the database, either using SQL statements or querying individual objects by table and primary key values. The Callback API supports the Polyhedra concept of active queries. When a C++ client launches a query, the callback API code interrogates the server. when data arrives, the user is called back once per row returned, and is able to read the attribute values. If the query is active, then when data changes the call-back functions will again be called and the user code can pic
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