Making high level API work properly with azuresql URLs

dburl.go

@@ -24,7 +24,11 @@ func Open(urlstr string) (*sql.DB, error) {
 	if err != nil {
 		return nil, err
 	}
-	return sql.Open(u.Driver, u.DSN)
+	driver := u.Driver
+	if u.GoDriver != "" {
+		driver = u.GoDriver
+	}
+	return sql.Open(driver, u.DSN)
 }
 
 // URL wraps the standard [net/url.URL] type, adding OriginalScheme, Transport,
@@ -40,8 +44,12 @@ type URL struct {
 	// Driver is the non-aliased SQL driver name that should be used in a call
 	// to sql/Open.
 	Driver string
-	// Unaliased is the unaliased driver name.
-	Unaliased string
+	// GoDriver is the Go SQL driver name to use when opening a connection to
+	// the database. Used by Microsoft SQL Server's azuresql URLs, as the
+	// wire-compatible alias style uses a different syntax style.
+	GoDriver string
+	// UnaliasedDriver is the unaliased driver name.
+	UnaliasedDriver string
 	// DSN is the built connection "data source name" that can be used in a
 	// call to sql/Open.
 	DSN string
@@ -123,12 +131,12 @@ func Parse(urlstr string) (*URL, error) {
 		}
 	}
 	// set driver
-	u.Driver, u.Unaliased = scheme.Driver, scheme.Driver
+	u.Driver, u.UnaliasedDriver = scheme.Driver, scheme.Driver
 	if scheme.Override != "" {
 		u.Driver = scheme.Override
 	}
 	// generate dsn
-	if u.DSN, err = scheme.Generator(u); err != nil {
+	if u.DSN, u.GoDriver, err = scheme.Generator(u); err != nil {
 		return nil, err
 	}
 	return u, nil
@@ -185,7 +193,7 @@ func (u *URL) Short() string {
 // Normalize returns the driver, host, port, database, and user name of a URL,
 // joined with sep, populating blank fields with empty.
 func (u *URL) Normalize(sep, empty string, cut int) string {
-	s := []string{u.Unaliased, "", "", "", ""}
+	s := []string{u.UnaliasedDriver, "", "", "", ""}
 	if u.Transport != "tcp" && u.Transport != "unix" {
 		s[0] += "+" + u.Transport
 	}

dburl_test.go

@@ -124,10 +124,10 @@ func TestParse(t *testing.T) {
 		{`mssql://user:pass@localhost/dbname`, `sqlserver`, `sqlserver://user:pass@localhost/?database=dbname`, ``},
 		{`mssql://user@localhost/service/dbname`, `sqlserver`, `sqlserver://user@localhost/service?database=dbname`, ``},
 		{`mssql://user:!234%23$@localhost:1580/dbname`, `sqlserver`, `sqlserver://user:%21234%23$@localhost:1580/?database=dbname`, ``},
-		{`mssql://user:!234%23$@localhost:1580/service/dbname?fedauth=true`, `sqlserver`, `azuresql://user:%21234%23$@localhost:1580/service?database=dbname&fedauth=true`, ``},
-		{`azuresql://user:pass@localhost:100/dbname`, `sqlserver`, `azuresql://user:pass@localhost:100/?database=dbname`, ``},
-		{`sqlserver://xxx.database.windows.net?database=xxx&fedauth=ActiveDirectoryMSI`, `sqlserver`, `azuresql://xxx.database.windows.net?database=xxx&fedauth=ActiveDirectoryMSI`, ``},
-		{`azuresql://xxx.database.windows.net/dbname?fedauth=ActiveDirectoryMSI`, `sqlserver`, `azuresql://xxx.database.windows.net/?database=dbname&fedauth=ActiveDirectoryMSI`, ``},
+		{`mssql://user:!234%23$@localhost:1580/service/dbname?fedauth=true`, `azuresql`, `sqlserver://user:%21234%23$@localhost:1580/service?database=dbname&fedauth=true`, ``},
+		{`azuresql://user:pass@localhost:100/dbname`, `azuresql`, `sqlserver://user:pass@localhost:100/?database=dbname`, ``},
+		{`sqlserver://xxx.database.windows.net?database=xxx&fedauth=ActiveDirectoryMSI`, `azuresql`, `sqlserver://xxx.database.windows.net?database=xxx&fedauth=ActiveDirectoryMSI`, ``},
+		{`azuresql://xxx.database.windows.net/dbname?fedauth=ActiveDirectoryMSI`, `azuresql`, `sqlserver://xxx.database.windows.net/?database=dbname&fedauth=ActiveDirectoryMSI`, ``},
 		{
 			`adodb://Microsoft.ACE.OLEDB.12.0?Extended+Properties=%22Text%3BHDR%3DNO%3BFMT%3DDelimited%22`, `adodb`, // 30
 			`Data Source=.;Extended Properties="Text;HDR=NO;FMT=Delimited";Provider=Microsoft.ACE.OLEDB.12.0`, ``,
@@ -214,7 +214,9 @@ func TestParse(t *testing.T) {
 		switch {
 		case err != nil:
 			t.Fatalf("test %d expected no error, got: %v", i, err)
-		case u.Driver != test.d:
+		case u.GoDriver != "" && u.GoDriver != test.d:
+			t.Errorf("test %d expected go driver %q, got: %q", i, test.d, u.GoDriver)
+		case u.GoDriver == "" && u.Driver != test.d:
 			t.Errorf("test %d expected driver %q, got: %q", i, test.d, u.Driver)
 		case u.DSN != test.exp:
 			_, err := os.Stat(test.path)