Question

I can call an ORACLE stored procedure through OCI in a C program by constructing the SQL command for the command, here’s a brief snippet from my code:

      /* build sql statement calling stored procedure */       strcpy ( sql_stmt, 'call get_tab_info(:x)' );       rc = OCIStmtPrepare(p_sql, p_err, sql_stmt,           (ub4) strlen (sql_stmt), (ub4) OCI_NTV_SYNTAX, (ub4) OCI_DEFAULT); 

But how do I construct a call (in my C program) to an ORACLE function with the following signature:

      CREATE OR REPLACE FUNCTION get_seq_number (p_table_name IN VARCHAR2, p_seq_type IN VARCHAR2)        RETURN NUMBER IS 

To call the function in PL/SQL I would use for example:

      v_seq := get_seq_number(v_tabname, v_seqtype); 

How do I construct the SQL character array (sql_stmt) to call the ORACLE function in my C program ?

Answer 1

Construct your SQL statment as follows

strcpy ( sql_stmt, 'BEGIN :v_seq := get_seq_number(:v_tabname, :v_seqtype); END;' ); 

Prepare your statement as previously. Bind the variables by name (including the v_seq as previous in your code and execute the statement. When the procedure completes, the value of :v_seq will be set correctly.