fix

utils/placeholder/placeholder.go

@@ -0,0 +1,12 @@
+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, ",")
+}