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Displaying Source Code(s)
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Connect C++ To Odbc data source (Mini Project)
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Description : This program connects to an ODBC data source
called "db97". It then executes a SQL statement “SELECT Model
Code :
// This program connects to an ODBC data source called "db97".
It then
executes a SQL statement “SELECT Model
#include <windows.h>
#include <sqlext.h>
#include <stdio.h>
int main(void)
{
HENV hEnv = NULL;
// Env Handle from SQLAllocEnv()
HDBC hDBC = NULL;
// Connection handle
HSTMT hStmt = NULL;
// Statement handle
UCHAR szDSN[SQL_MAX_DSN_LENGTH] =<BR>db97"; // Data Source Name
buffer
UCHAR* szUID = NULL;
// User ID buffer
UCHAR* szPasswd = NULL;
// Password buffer
UCHAR szModel[128];
// Model buffer
SDWORD cbModel;
// Model buffer bytes recieved
UCHAR szSqlStr[] = "Select Model From
Makes Where Make='Vauxhall'"; // SQL string
RETCODE retcode;
// Return code
// Allocate memory for ODBC Environment handle
SQLAllocEnv (&hEnv);
// Allocate memory for the connection handle
SQLAllocConnect (hEnv, &hDBC);
// Connect to the data source "db97" using userid and
password.
retcode = SQLConnect (hDBC, szDSN, SQL_NTS, szUID,
SQL_NTS, szPasswd, SQL_NTS);
if (retcode == SQL_SUCCESS || retcode ==
SQL_SUCCESS_WITH_INFO)
{
// Allocate memory for the statement
handle
retcode = SQLAllocStmt (hDBC, &hStmt);
// Prepare the SQL statement by
assigning
it to the statement handle
retcode = SQLPrepare (hStmt, szSqlStr,
sizeof (szSqlStr));
// Execute the SQL statement handle
retcode = SQLExecute (hStmt);
// Project only column 1 which is the
models
SQLBindCol (hStmt, 1, SQL_C_CHAR,
szModel,
sizeof(szModel), &cbModel);
// Get row of data from the result set
defined above in the statement
retcode = SQLFetch (hStmt);
while (retcode == SQL_SUCCESS ||
retcode
== SQL_SUCCESS_WITH_INFO)
{
printf (" %s<BR>,
szModel); // Print row
(model)
retcode = SQLFetch
(hStmt); // Fetch next row from result
set
}
// Free the allocated statement handle
SQLFreeStmt (hStmt, SQL_DROP);
// Disconnect from datasource
SQLDisconnect (hDBC);
}
// Free the allocated connection handle
SQLFreeConnect (hDBC);
// Free the allocated ODBC environment handle
SQLFreeEnv (hEnv);
return 0;
} |
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