sqlite3_create_function

int sqlite3_create_function(
     sqlite3 * db,
     const(char) * zFunctionName,
     int  nArg,
     int  eTextRep,
     void  * pApp,
     void  function (sqlite3_context *, int, sqlite3_value * *)  xFunc,
     void  function (sqlite3_context *, int, sqlite3_value * *)  xStep,
     void  function (sqlite3_context *)  xFinal
)

CAPI3REF: Create Or Redefine SQL Functions