Your application must establish a connection before it can perform any database operations.

To establish an ODBC connection

1. Allocate an ODBC environment.

   For example:

   SQLHENV env; SQLRETURN retcode; retcode = SQLAllocHandle( SQL_HANDLE_ENV, SQL_NULL_HANDLE, &env );

2. Declare the ODBC version.

   By declaring that the application follows ODBC version 3, SQLSTATE values and some other version-dependent features are set to the proper behavior. For example:

   retcode = SQLSetEnvAttr( env, SQL_ATTR_ODBC_VERSION, (void*)SQL_OV_ODBC3, 0);

3. If necessary, assemble the data source or connection string.

   Depending on your application, you may have a hard-coded data source or connection string, or you may store it externally for greater flexibility.

4. Allocate an ODBC connection item.

   For example:

   retcode = SQLAllocHandle( SQL_HANDLE_DBC, env, &dbc );

5. Set any connection attributes that must be set before connecting.

   Some connection attributes must be set before establishing a connection or after establishing a connection, while others can be set either before or after. The SQL_AUTOCOMMIT attribute is one that can be set before or after:

   retcode = SQLSetConnectAttr( dbc, SQL_AUTOCOMMIT, (SQLPOINTER)SQL_AUTOCOMMIT_OFF, 0 );

   For more information, see Setting connection attributes.

6. Call the ODBC connection function.

   For example:

   if (retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO) { printf( "dbc allocated\n" ); retcode = SQLConnect( dbc, (SQLCHAR*) "SQL Anywhere 11 Demo", SQL_NTS, (SQLCHAR* ) "DBA", SQL_NTS, (SQLCHAR*) "sql", SQL_NTS ); if (retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO){ // successfully connected.

You can find a complete sample in samples-dir\SQLAnywhere\ODBCConnect\odbcconnect.cpp.

Notes