modernc.org/sqlite 新增 NewConnector 支持

database/sql offers no way to reach a registered driver: sql.Drivers returns names only and there is no sql.Driver(name). The single route from the "sqlite" name back to the driver value is (*sql.DB).Driver(), which is why callers who need it resort to

db, _ := sql.Open("sqlite", "") drv := db.Driver() db.Close()

That opens nothing - it works only because sql.Open does not connect and *Driver does not implement driver.DriverContext. Both are properties this package could change without noticing it had broken anyone.

Callers want the driver in order to interpose on the physical connections database/sql opens: tracing, metrics, connection-scoped setup. Handing out the driver alone would not be enough, because the only way to get a wrapper into a *sql.DB through sql.Open is sql.Register, which is process-global, panics on a name it has already seen and cannot be undone - so a library has to invent a unique name per configuration. TestConnectio...