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PQparamCreate(3)

NAME

   PQparamCreate,   PQparamCount   PQparamReset,  PQparamClear  -  PGparam
   management functions.

SYNOPSIS

   #include <libpqtypes.h>

   PGparam *PQparamCreate(const PGconn *conn);
   PGparam *PQparamDup(PGparam *param);
   int PQparamCount(PGparam *param);
   void PQparamReset(PGparam *param);
   void PQparamClear(PGparam *param);

DESCRIPTION

   These functions manage the opaque PGparam object.

   PQparamCreate() will allocate and  initialize  a  new  PGparam  object.
   After  the  create call, the PGparam object is ready for use.  WARNING:
   Only types  that  have  been  registered  via  PQregisterXXX,  will  be
   available  to  the param.  Meaning, the param is not updated with types
   registered after the param is created.

   PQparamDup() will duplicate a given  PGparam,  including  any  internal
   values  that  have  already been put. This is useful in cases where you
   want to queue qeuries to execute at a later  time,  like  a  connection
   pooler.   The  problem  is  PGparamCreate requires a connection object,
   which may not be available when attempting to enqueue a query with  its
   PGparam  object.   Instead,  a  PGparam  object  can  used for the sole
   purpose of creating duplicates while  there  are  no  available  PGconn
   objects.

   PQparamCount() gets the number of parameters in a PGparam object.

   PQparamReset()  will  clear out any previously put parameters, but will
   not free any memory.  This is useful for application looking to "reuse"
   a PGparam object.

   PQparamClear()  releases  all resources being used by a PGparam object,
   the object should not be used after a clear.

   It is very important to call PQparamReset() if you plan  on  reusing  a
   PGparam object.

RETURN VALUE

   PQparamCreate()  returns  a  pointer to a PGparam object on success and
   NULL if something failed (check PQgeterror(3) for more information).

   PQparamCount() returns the number of parameters in a PGparam object.

   PQparamReset() and PQparamClear() have no  return  values.   If  either
   function is provided a NULL PGparam pointer, it will silently fail.

EXAMPLES

   None.

AUTHOR

   A  contribution  of  eSilo, LLC. for the PostgreSQL Database Management
   System.  Written by Andrew Chernow and Merlin Moncure.

REPORTING BUGS

   Report bugs to <[email protected]>.

COPYRIGHT

   Copyright (c) 2011 eSilo, LLC. All rights reserved.
   This is free software; see the source for copying conditions.  There is
   NO  warranty; not even for MERCHANTABILITY or  FITNESS FOR A PARTICULAR
   PURPOSE.

SEE ALSO

   pqt-specs(3), PQputf(3), PQgeterror(3), PQparamExec(3)



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