Add db-connect, a SQL over HTTPS server

vendor/github.com/kshvakov/clickhouse/clickhouse_exception.go

@@ -0,0 +1,47 @@
+package clickhouse
+
+import (
+	"fmt"
+	"strings"
+)
+
+type Exception struct {
+	Code       int32
+	Name       string
+	Message    string
+	StackTrace string
+	nested     error
+}
+
+func (e *Exception) Error() string {
+	return fmt.Sprintf("code: %d, message: %s", e.Code, e.Message)
+}
+
+func (ch *clickhouse) exception() error {
+	defer ch.conn.Close()
+	var (
+		e         Exception
+		err       error
+		hasNested bool
+	)
+	if e.Code, err = ch.decoder.Int32(); err != nil {
+		return err
+	}
+	if e.Name, err = ch.decoder.String(); err != nil {
+		return err
+	}
+	if e.Message, err = ch.decoder.String(); err != nil {
+		return err
+	}
+	e.Message = strings.TrimSpace(strings.TrimPrefix(e.Message, e.Name+":"))
+	if e.StackTrace, err = ch.decoder.String(); err != nil {
+		return err
+	}
+	if hasNested, err = ch.decoder.Bool(); err != nil {
+		return err
+	}
+	if hasNested {
+		e.nested = ch.exception()
+	}
+	return &e
+}