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## SQLite C Interface

### Obtain Aggregate Function Context

>     void *sqlite3_aggregate_context(sqlite3_context*, int nBytes);

The implementation of aggregate SQL functions use this routine to allocate a structure for storing their state. The first time this routine is called for a particular aggregate, a new structure of size nBytes is allocated, zeroed, and returned. On subsequent calls (for the same aggregate instance) the same buffer is returned. The implementation of the aggregate can use the returned buffer to accumulate data.

The buffer allocated is freed automatically by SQLite whan the aggregate query concludes.

The first parameter should be a copy of the SQL function context that is the first parameter to the callback routine that implements the aggregate function.

This routine must be called from the same thread in which the aggregate SQL function is running.

See also lists of Objects, Constants, and Functions.

This page last modified 2007/11/22 00:41:31 UTC