This example demonstrates how OTL/ODBC works with MS SQL Server's GUIDs. Briefly, GUIDs get mapped to C++ null terminated strings on both input and output. GUIDs are supported only by MS SQL Server 7.x and MS SQL Server 2000.
#include <iostream> using namespace std; #include <stdio.h>
#define OTL_ODBC // Compile OTL 4.0/ODBC #include <otlv4.h> // include the OTL 4.0 header file otl_connect db; // connect object void insert() // insert rows into table { otl_stream o(5, // buffer size "insert into test_tab values(:f1<int>,newid())", // SQL statement db // connect object ); for(int i=1;i<=13;++i) o<<i; } void select() { otl_stream i(5, // buffer size "select * from test_tab", // SELECT statement db // connect object ); // create select stream otl_stream o(7, // buffer size "insert into test_tab2 values(:f1<int>,:f2<char[37]>)", // INSERT statement db // connect object ); // create insert stream o.set_commit(0); // turnin off the otl_stream's autocommit flag int f1; char f2[37]; while(!i.eof()){ // while not end-of-data i>>f1>>f2; cout<<"f1="<<f1<<", f2="<<f2<<endl; o<<f1<<f2; } o.flush(); // flushing the otl_stream's buffer db.commit(); // committing transaction } int main() { otl_connect::otl_initialize(); // initialize ODBC environment try{ db.rlogon("UID=scott;PWD=tiger;DSN=mssql"); // connect to ODBC otl_cursor::direct_exec ( db, "drop table test_tab", otl_exception::disabled // disable OTL exceptions ); // drop table otl_cursor::direct_exec ( db, "create table test_tab(f1 int, f2 uniqueidentifier)" ); // create table otl_cursor::direct_exec ( db, "drop table test_tab2", otl_exception::disabled // disable OTL exceptions ); // drop table otl_cursor::direct_exec ( db, "create table test_tab2(f1 int, f2 uniqueidentifier)" ); // create table insert(); // insert records into table select(); // select records from test_tab and insert them into test_tab2 } catch(otl_exception& p){ // intercept OTL exceptions cerr<<p.msg<<endl; // print out error message cerr<<p.stm_text<<endl; // print out SQL that caused the error cerr<<p.sqlstate<<endl; // print out SQLSTATE message cerr<<p.var_info<<endl; // print out the variable that caused the error } db.logoff(); // disconnect from ODBC return 0; }
The actual GUID values will be different on each run of this example.
f1=1, f2=15B6CB56-F9CD-11D4-A633-86FF6E6A224E f1=2, f2=15B6CB57-F9CD-11D4-A633-86FF6E6A224E f1=3, f2=15B6CB58-F9CD-11D4-A633-86FF6E6A224E f1=4, f2=15B6CB59-F9CD-11D4-A633-86FF6E6A224E f1=5, f2=15B6CB5A-F9CD-11D4-A633-86FF6E6A224E f1=6, f2=15B6CB5B-F9CD-11D4-A633-86FF6E6A224E f1=7, f2=15B6CB5C-F9CD-11D4-A633-86FF6E6A224E f1=8, f2=15B6CB5D-F9CD-11D4-A633-86FF6E6A224E f1=9, f2=15B6CB5E-F9CD-11D4-A633-86FF6E6A224E f1=10, f2=15B6CB5F-F9CD-11D4-A633-86FF6E6A224E f1=11, f2=15B6CB60-F9CD-11D4-A633-86FF6E6A224E f1=12, f2=15B6CB61-F9CD-11D4-A633-86FF6E6A224E f1=13, f2=15B6CB62-F9CD-11D4-A633-86FF6E6A224E
Copyright © 1996-2023, Sergei Kuchin, email: skuchin@gmail.com, skuchin@gmail.com .
Permission to use, copy, modify and redistribute this document for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.