OTL 4.0, Example 105 (OTL/ODBC and MS SQL Server's GUIDs)

Example 105 (OTL/ODBC and MS SQL Server's GUIDs)

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.

Source Code

#include <iostream>
using namespace std;

#include <stdio.h>
#define OTL_ODBC_MSSQL_2008 // Compile OTL 4.0/ODBC for MS SQL 2008
#define OTL_MAP_SQL_GUID_TO_CHAR
#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=mssql2008"); // 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;

}

Output

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



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