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