Beispiel #1
0
func initDriver() error {

	//Allocate environment handle
	var out api.SQLHANDLE
	in := api.SQLHANDLE(api.SQL_NULL_HANDLE)
	ret := api.SQLAllocHandle(api.SQL_HANDLE_ENV, in, &out)
	if IsError(ret) {
		return NewError("SQLAllocHandle", api.SQLHENV(in))
	}
	drv.h = api.SQLHENV(out)
	drv.Stats.updateHandleCount(api.SQL_HANDLE_ENV, 1)

	// will use ODBC v3
	ret = api.SQLSetEnvUIntPtrAttr(drv.h, api.SQL_ATTR_ODBC_VERSION, api.SQL_OV_ODBC3, 0)
	if IsError(ret) {
		defer releaseHandle(drv.h)
		return NewError("SQLSetEnvUIntPtrAttr", drv.h)
	}

	//TODO: find a way to make this attribute changeable at runtime
	//Enable connection pooling
	ret = api.SQLSetEnvUIntPtrAttr(drv.h, api.SQL_ATTR_CONNECTION_POOLING, api.SQL_CP_ONE_PER_HENV, api.SQL_IS_UINTEGER)
	if IsError(ret) {
		defer releaseHandle(drv.h)
		return NewError("SQLSetEnvUIntPtrAttr", drv.h)
	}

	//Set relaxed connection pool matching
	ret = api.SQLSetEnvUIntPtrAttr(drv.h, api.SQL_ATTR_CP_MATCH, api.SQL_CP_RELAXED_MATCH, api.SQL_IS_UINTEGER)
	if IsError(ret) {
		defer releaseHandle(drv.h)
		return NewError("SQLSetEnvUIntPtrAttr", drv.h)
	}

	//TODO: it would be nice if we could call "drv.SetMaxIdleConns(0)" here but from the docs it looks like
	//the user must call this function after db.Open

	return nil
}
Beispiel #2
0
func ToHandleAndType(handle interface{}) (h api.SQLHANDLE, ht api.SQLSMALLINT) {
	switch v := handle.(type) {
	case api.SQLHENV:
		if v == api.SQLHENV(api.SQL_NULL_HANDLE) {
			ht = 0
		} else {
			ht = api.SQL_HANDLE_ENV
		}
		h = api.SQLHANDLE(v)
	case api.SQLHDBC:
		ht = api.SQL_HANDLE_DBC
		h = api.SQLHANDLE(v)
	case api.SQLHSTMT:
		ht = api.SQL_HANDLE_STMT
		h = api.SQLHANDLE(v)
	default:
		panic(fmt.Errorf("unexpected handle type %T", v))
	}
	return h, ht
}
Beispiel #3
0
func (d *Driver) Close() error {
	// TODO(brainman): who will call (*Driver).Close (to dispose all opened handles)?
	h := d.h
	d.h = api.SQLHENV(api.SQL_NULL_HENV)
	return releaseHandle(h)
}