remove QuoteStr() usage in engine.go

Author: BetaCat0

engine.go

@@ -177,6 +177,7 @@ func (engine *Engine) SupportInsertMany() bool {
 
 // QuoteStr Engine's database use which character as quote.
 // mysql, sqlite use ` and postgres use "
+// Deprecated, use Quote() instead
 func (engine *Engine) QuoteStr() string {
 	return engine.dialect.QuoteStr()
 }
@@ -196,13 +197,23 @@ func (engine *Engine) Quote(value string) string {
 		return value
 	}
 
-	if string(value[0]) == engine.dialect.QuoteStr() || value[0] == '`' {
+	dummy := engine.dialect.Quote("")
+	prefix, suffix := dummy[0], dummy[1]
+
+	if len(dummy) != 2 || value[0] == prefix || value[0] == '`' { // no quote
 		return value
+	} else {
+		raw := []byte{prefix}
+		for i := 0; i < len(value); i++ {
+			if value[i] == '.' {
+				raw = append(raw, suffix, '.', prefix)
+			} else {
+				raw = append(raw, value[i])
+			}
+		}
+		raw = append(raw, suffix)
+		return string(raw)
 	}
-
-	value = strings.Replace(value, ".", engine.dialect.QuoteStr()+"."+engine.dialect.QuoteStr(), -1)
-
-	return engine.dialect.QuoteStr() + value + engine.dialect.QuoteStr()
 }
 
 // QuoteTo quotes string and writes into the buffer
@@ -216,20 +227,29 @@ func (engine *Engine) QuoteTo(buf *builder.StringBuilder, value string) {
 		return
 	}
 
-	if string(value[0]) == engine.dialect.QuoteStr() || value[0] == '`' {
-		buf.WriteString(value)
+	dummy := engine.dialect.Quote("")
+	prefix, suffix := dummy[0], dummy[1]
+
+	if len(dummy) != 2 || value[0] == prefix || value[0] == '`' { // no quote
+		_, _ = buf.WriteString(value)
 		return
+	} else {
+		_ = buf.WriteByte(prefix)
+		for i := 0; i < len(value); i++ {
+			if value[i] == '.' {
+				_ = buf.WriteByte(suffix)
+				_ = buf.WriteByte('.')
+				_ = buf.WriteByte(prefix)
+			} else {
+				_ = buf.WriteByte(value[i])
+			}
+		}
+		_ = buf.WriteByte(suffix)
 	}
-
-	value = strings.Replace(value, ".", engine.dialect.QuoteStr()+"."+engine.dialect.QuoteStr(), -1)
-
-	buf.WriteString(engine.dialect.QuoteStr())
-	buf.WriteString(value)
-	buf.WriteString(engine.dialect.QuoteStr())
 }
 
 func (engine *Engine) quote(sql string) string {
-	return engine.dialect.QuoteStr() + sql + engine.dialect.QuoteStr()
+	return engine.dialect.Quote(sql)
 }
 
 // SqlType will be deprecated, please use SQLType instead
@@ -1581,7 +1601,7 @@ func (engine *Engine) formatColTime(col *core.Column, t time.Time) (v interface{
 func (engine *Engine) formatTime(sqlTypeName string, t time.Time) (v interface{}) {
 	switch sqlTypeName {
 	case core.Time:
-		s := t.Format("2006-01-02 15:04:05") //time.RFC3339
+		s := t.Format("2006-01-02 15:04:05") // time.RFC3339
 		v = s[11:19]
 	case core.Date:
 		v = t.Format("2006-01-02")