Re: SQL Statements embedded in RPG

["David Morris" <dmorris@xxxxxxxxxxxxx>]

james,

As Alexei pointed out, you can use the CLI APIs.  Those APIs are well suited to 
your needs.  
The other option is to use an SQLDA which defines the format of data returned 
from an SQL 
statement.  The RPGIV code that I referred to uses this technique.  The code 
that I referred to 
uses it in a more dynamic manner, but it could easily be used as follows:

ReturnArea     DS
Fld1...

EVAL SelStmt = 'Select * from filea where fld1 >  ''X'''
EVAL SqlHnd = CrtSQLHnd(SelStmt)

DOU FetchEOF or FetchErr
EVAL FetchRtn = FetchSQL(SqlHnd: ReturnArea)
IF not FetchEOF and not FetchErr
do something
ENDDO
ENDDO


>>> james@dansfoods.com 02/17/00 03:49PM >>>
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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