update mssql drive to last working version 20180314172330-6a30f4e59a44 (#7306)

vendor/github.com/denisenkom/go-mssqldb/parser.go

@@ -11,6 +11,9 @@ type parser struct {
 	w          bytes.Buffer
 	paramCount int
 	paramMax   int
+
+	// using map as a set
+	namedParams map[string]bool
 }
 
 func (p *parser) next() (rune, bool) {
@@ -39,13 +42,14 @@ type stateFunc func(*parser) stateFunc
 
 func parseParams(query string) (string, int) {
 	p := &parser{
-		r: bytes.NewReader([]byte(query)),
+		r:           bytes.NewReader([]byte(query)),
+		namedParams: map[string]bool{},
 	}
 	state := parseNormal
 	for state != nil {
 		state = state(p)
 	}
-	return p.w.String(), p.paramMax
+	return p.w.String(), p.paramMax + len(p.namedParams)
 }
 
 func parseNormal(p *parser) stateFunc {
@@ -55,7 +59,7 @@ func parseNormal(p *parser) stateFunc {
 			return nil
 		}
 		if ch == '?' {
-			return parseParameter
+			return parseOrdinalParameter
 		} else if ch == '$' || ch == ':' {
 			ch2, ok := p.next()
 			if !ok {
@@ -64,7 +68,9 @@ func parseNormal(p *parser) stateFunc {
 			}
 			p.unread()
 			if ch2 >= '0' && ch2 <= '9' {
-				return parseParameter
+				return parseOrdinalParameter
+			} else if 'a' <= ch2 && ch2 <= 'z' || 'A' <= ch2 && ch2 <= 'Z' {
+				return parseNamedParameter
 			}
 		}
 		p.write(ch)
@@ -83,7 +89,7 @@ func parseNormal(p *parser) stateFunc {
 	}
 }
 
-func parseParameter(p *parser) stateFunc {
+func parseOrdinalParameter(p *parser) stateFunc {
 	var paramN int
 	var ok bool
 	for {
@@ -113,6 +119,30 @@ func parseParameter(p *parser) stateFunc {
 	return parseNormal
 }
 
+func parseNamedParameter(p *parser) stateFunc {
+	var paramName string
+	var ok bool
+	for {
+		var ch rune
+		ch, ok = p.next()
+		if ok && (ch >= '0' && ch <= '9' || 'a' <= ch && ch <= 'z' || 'A' <= ch && ch <= 'Z') {
+			paramName = paramName + string(ch)
+		} else {
+			break
+		}
+	}
+	if ok {
+		p.unread()
+	}
+	p.namedParams[paramName] = true
+	p.w.WriteString("@")
+	p.w.WriteString(paramName)
+	if !ok {
+		return nil
+	}
+	return parseNormal
+}
+
 func parseQuote(p *parser) stateFunc {
 	for {
 		ch, ok := p.next()