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SQLITE3_VTAB(3)            Library Functions Manual            SQLITE3_VTAB(3)

     sqlite3_vtab - Virtual Table Instance Object

     struct sqlite3_vtab;

     Every virtual table module implementation uses a subclass of this object
     to describe a particular instance of the virtual table.  Each subclass
     will be tailored to the specific needs of the module implementation.  The
     purpose of this superclass is to define certain fields that are common to
     all module implementations.

     Virtual tables methods can set an error message by assigning a string
     obtained from sqlite3_mprintf() to zErrMsg.  The method should take care
     that any prior string is freed by a call to sqlite3_free() prior to
     assigning a new string to zErrMsg.  After the error message is delivered
     up to the client application, the string will be automatically freed by
     sqlite3_free() and the zErrMsg field will be zeroed.

     sqlite3_malloc(3), sqlite3_mprintf(3), sqlite3_module(3)

NetBSD 8.0                      March 11, 2017                      NetBSD 8.0