Medhavi Mahansaria <medhavi.mahansaria@xxxxxxx> wrote: > Now my problem is that my bind variables are of string type and > when the get a NULL value is converts it into an empty string in > C++ programming. > Example: > insert into check_date values > (to_date(:h1,'yyyymmddhh24miss'), > 1, > to_date(:h2,'yyyymmddhh24miss')); > > now h1 and h2 are of string datatype in my c++ program. > > If no value is there, it is passed on as a empty string into my > query. > > How can I handle this to enter NULL values? Well, arguably the best solution is to use a tool chain that doesn't conflate any particular "magic value" with NULL. Where that can't be done, you might want to look at the SQL standard's NULLIF() construct. insert into check_date values (to_date(nullif(:h1, ''),'yyyymmddhh24miss'), 1, to_date(nullif(:h2, ''),'yyyymmddhh24miss')); If the two arguments to nullif() are equal, it returns NULL; otherwise it returns the first argument. -- Kevin Grittner EDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
