How do I connect SQL with c++?

Question

Sumit Shaw · Accepted Answer

int main() {
    #define SQL_RESULT_LEN 240
    #define SQL_RETURN_CODE_LEN 1000
    //define handles and variables
    SQLHANDLE sqlConnHandle;
    SQLHANDLE sqlStmtHandle;
    SQLHANDLE sqlEnvHandle;
    SQLWCHAR retconstring[SQL_RETURN_CODE_LEN];
    //initializations
    sqlConnHandle = NULL;
    sqlStmtHandle = NULL;
    //allocations
    if (SQL_SUCCESS != SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &sqlEnvHandle))
        goto COMPLETED;
    if (SQL_SUCCESS != SQLSetEnvAttr(sqlEnvHandle, SQL_ATTR_ODBC_VERSION, (SQLPOINTER)SQL_OV_ODBC3, 0))
        goto COMPLETED;
    if (SQL_SUCCESS != SQLAllocHandle(SQL_HANDLE_DBC, sqlEnvHandle, &sqlConnHandle))
        goto COMPLETED;
    //output
    cout << "Attempting connection to SQL Server...";
    cout << "
";
    //connect to SQL Server  
    //I am using a trusted connection and port 14808
    //it does not matter if you are using default or named instance
    //just make sure you define the server name and the port
    //You have the option to use a username/password instead of a trusted     connection
    //but is more secure to use a trusted connection
    switch (SQLDriverConnectW(sqlConnHandle,
        NULL,
        (SQLWCHAR*)L"DRIVER={SQL Server};SERVER=ServerAddress,     1433;DATABASE=DataBaseName;UID=DataBaseUserName;PWD=PassWord;",
        //(SQLWCHAR*)L"DRIVER={SQL Server};SERVER=localhost, 1433;DATABASE=master;Trusted=true;",
        SQL_NTS,
        retconstring,
        1024,
        NULL,
        SQL_DRIVER_NOPROMPT)) {
    case SQL_SUCCESS:
        cout << "Successfully connected to SQL Server";
        cout << "
";
        break;
    case SQL_SUCCESS_WITH_INFO:
        cout << "Successfully connected to SQL Server";
        cout << "
";
        break;
    case SQL_INVALID_HANDLE:
        cout << "Could not connect to SQL Server";
        cout << "
";
        goto COMPLETED;
    case SQL_ERROR:
        cout << "Could not connect to SQL Server";
        cout << "
";
        goto COMPLETED;
    default:
        break;
    }
    //if there is a problem connecting then exit application
    if (SQL_SUCCESS != SQLAllocHandle(SQL_HANDLE_STMT, sqlConnHandle,     &sqlStmtHandle))
        goto COMPLETED;
    //output
    cout << "
";
    cout << "Executing T-SQL query...";
    cout << "
";
    //if there is a problem executing the query then exit application
    //else display query result
    if (SQL_SUCCESS != SQLExecDirectW(sqlStmtHandle, (SQLWCHAR*)L"SELECT @@VERSION", SQL_NTS)) {
        cout << "Error querying SQL Server";
        cout << "
";
        goto COMPLETED;
    }
    else {
        //declare output variable and pointer
        SQLCHAR sqlVersion[SQL_RESULT_LEN];
        SQLINTEGER ptrSqlVersion;
        while (SQLFetch(sqlStmtHandle) == SQL_SUCCESS) {
            SQLGetData(sqlStmtHandle, 1, SQL_CHAR, sqlVersion,     SQL_RESULT_LEN, &ptrSqlVersion);
            //display query result
            cout << "
Query Result:

";
            cout << sqlVersion << endl;
        }
    }
    //close connection and free resources
COMPLETED:
    SQLFreeHandle(SQL_HANDLE_STMT, sqlStmtHandle);
    SQLDisconnect(sqlConnHandle);
    SQLFreeHandle(SQL_HANDLE_DBC, sqlConnHandle);
    SQLFreeHandle(SQL_HANDLE_ENV, sqlEnvHandle);
    //pause the console window - exit when key is pressed
    cout << "
Press any key to exit...";
    getchar();
}

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How do I connect SQL with c++?

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