Exemple #1
0
func (c *Conn) PrepareODBCStmt(query string) (*ODBCStmt, error) {
	var out api.SQLHANDLE
	ret := api.SQLAllocHandle(api.SQL_HANDLE_STMT, api.SQLHANDLE(c.h), &out)
	if IsError(ret) {
		return nil, NewError("SQLAllocHandle", c.h)
	}
	h := api.SQLHSTMT(out)
	drv.Stats.updateHandleCount(api.SQL_HANDLE_STMT, 1)

	b := api.StringToUTF16(query)
	ret = api.SQLPrepare(h,
		(*api.SQLWCHAR)(unsafe.Pointer(&b[0])), api.SQLINTEGER(len(b)))
	if IsError(ret) {
		defer releaseHandle(h)
		return nil, NewError("SQLPrepare", h)
	}
	ps, err := ExtractParameters(h)
	if err != nil {
		defer releaseHandle(h)
		return nil, err
	}
	return &ODBCStmt{
		h:          h,
		Parameters: ps,
		usedByStmt: true,
	}, nil
}
Exemple #2
0
func (d *Driver) Open(dsn string) (driver.Conn, error) {
	var out api.SQLHANDLE
	ret := api.SQLAllocHandle(api.SQL_HANDLE_DBC, api.SQLHANDLE(d.h), &out)
	if IsError(ret) {
		return nil, NewError("SQLAllocHandle", d.h)
	}
	h := api.SQLHDBC(out)
	drv.Stats.updateHandleCount(api.SQL_HANDLE_DBC, 1)

	b := api.StringToUTF16(dsn)
	ret = api.SQLDriverConnect(h, 0,
		(*api.SQLWCHAR)(unsafe.Pointer(&b[0])), api.SQLSMALLINT(len(b)),
		nil, 0, nil, api.SQL_DRIVER_NOPROMPT)
	if IsError(ret) {
		defer releaseHandle(h)
		return nil, NewError("SQLDriverConnect", h)
	}
	return &Conn{h: h}, nil
}
Exemple #3
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.SQLSetEnvAttr(drv.h, api.SQL_ATTR_ODBC_VERSION,
		api.SQLPOINTER(api.SQL_OV_ODBC3), 0)
	if IsError(ret) {
		defer releaseHandle(drv.h)
		return NewError("SQLSetEnvAttr", drv.h)
	}

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

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