Setting Up Dynamic Queries and Streams with the C/C++ SDK

The Sybase CEP C/C++ SDK includes a way to register a query.

Registering a query includes:

• Creating the streams specified in the registered query.

• Creating the statements specified in the registered query.

• Compiling the CCL statements.

• Loading the query into the server.

• Connecting ("binding") the stream names in the CCL statements to the URI's of existing streams, or creating new streams.

• Starting execution of the query.

To register a query, use the C8RegisterQuery() function.

You must use a C8StreamInfo object to specify information about each of the streams used in the query. The information about each stream must include the following:

• The name of the stream as used in the query.

• Whether the stream is used as output stream, input stream, or local stream.

• The CCL URI of the stream (for input or output streams only).

If databases or user-defined extensions are used in the queries, the databases and extensions must be configured in the server and in the compiler for the query to work properly.

The query can use any of the streams in a project (query module) as well as any streams the query defines locally. The only restriction is that the local streams must be defined in such a way that the CCL compiler can deduce their schemas automatically. Also, the streams defined locally for this query are not available in any other queries. The query can also create new input streams and output streams.

• The API
  An introduction to SDK functions, their purposes, and parameters.
• Registering a query: Example
  This section contains an example program that registers a query.
• Creating Streams Dynamically
  In earlier sections, we showed how to bind the query to existing streams. You can also create your own streams. The approach is similar to that shown in the Java SDK chapter.
• Troubleshooting
  Provides examples of errors you may encounter with C/C++.