Merge branch 'develop' of https://gitee.com/fusenpack/fusenapi into develop

utils/placeholder/placeholder.go

@@ -1,12 +0,0 @@
-package sql_placeholder
-
-import "strings"
-
-// 获取对应长度占位符号
-func GetSqlPlaceholder(l uint) string {
-	s := make([]string, 0, int(l))
-	for i := 0; i < int(l); i++ {
-		s = append(s, "?")
-	}
-	return strings.Join(s, ",")
-}