Re: SQL Statements embedded in RPG

AS/400 implements what is known as SQL Call Level Interface (CLI).
It is dynamic in nature and therefore performs not as good as embedded SQL,
but it is industry standard.
It can be used by any ILE language.
Look here for further questions: http://www.as400.ibm.com/db2/clifaq.htm

    Alexei Pytel


James David Rich <james@dansfoods.com> on 02/17/2000 04:49:39 PM

Please respond to RPG400-L@midrange.com

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Subject:  Re: SQL Statements embedded in RPG




On Thu, 17 Feb 2000, David Morris wrote:

> start fetching records.  The implementation of SQL is hidden.

Does anyone know if something like the following is possible (using
subprocedures or even linking to a C program, I'm using C syntax here -
the goal is to make the SQL API on the 400 similar to the API of other
database engines):

int err;
char database[] = "my_db";
char query_string[100] = "select field1,field2 from table";
char *result;

err = sql_open(sql_handle);
if (err)
     /* handle the error */

err = sql_select_database (sql_handle, database_name);
if (err)
     /* you know what to do */

err = sql_query (sql_handle, query_string);
if (err)
     /* this is an error */

err = sql_fetch_rows (sql_handle, result);


Now at this point all the rows that match the select statement are stored
in the result array.  What I see as the advantage here is that the query
string is not hard coded anywhere (well, in my example it is but it could
be passed as a parameter).  Could the AS/400 SQL API be wrapped in
functions that would allow this?  Does the AS/400 have an SQL API that can
be used in C programs?  I have looked on the AS/400 documentation site and
I haven't found anything.  Pointers to the relevant info would be much
appreciated.

James Rich
james@dansfoods.com

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