Fix issue 1205 (#1211)

* fix #1205

* move builder into stores

* remove xrom

* Remove unused code

* Remove unused code

* refactor builderx to builder

Co-authored-by: anqiansong <anqiansong@bytedance.com>

core/stores/builder/builder.go

@@ -0,0 +1,63 @@
+package builder
+
+import (
+	"fmt"
+	"reflect"
+	"strings"
+)
+
+const dbTag = "db"
+
+// RawFieldNames converts golang struct field into slice string.
+func RawFieldNames(in interface{}, postgresSql ...bool) []string {
+	out := make([]string, 0)
+	v := reflect.ValueOf(in)
+	if v.Kind() == reflect.Ptr {
+		v = v.Elem()
+	}
+
+	var pg bool
+	if len(postgresSql) > 0 {
+		pg = postgresSql[0]
+	}
+
+	// we only accept structs
+	if v.Kind() != reflect.Struct {
+		panic(fmt.Errorf("ToMap only accepts structs; got %T", v))
+	}
+
+	typ := v.Type()
+	for i := 0; i < v.NumField(); i++ {
+		// gets us a StructField
+		fi := typ.Field(i)
+		if tagv := fi.Tag.Get(dbTag); tagv != "" {
+			if pg {
+				out = append(out, tagv)
+			} else {
+				out = append(out, fmt.Sprintf("`%s`", tagv))
+			}
+		} else {
+			if pg {
+				out = append(out, fi.Name)
+			} else {
+				out = append(out, fmt.Sprintf("`%s`", fi.Name))
+			}
+		}
+	}
+
+	return out
+}
+
+// PostgreSqlJoin concatenates the given elements into a string.
+func PostgreSqlJoin(elems []string) string {
+	b := new(strings.Builder)
+	for index, e := range elems {
+		b.WriteString(fmt.Sprintf("%s = $%d, ", e, index+2))
+	}
+
+	if b.Len() == 0 {
+		return b.String()
+	}
+
+	return b.String()[0 : b.Len()-2]
+}

core/stores/builder/builder_test.go

@@ -0,0 +1,24 @@
+package builder
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+type mockedUser struct {
+	ID       string `db:"id" json:"id,omitempty"`
+	UserName string `db:"user_name" json:"userName,omitempty"`
+	Sex      int    `db:"sex" json:"sex,omitempty"`
+	UUID     string `db:"uuid" uuid:"uuid,omitempty"`
+	Age      int    `db:"age" json:"age"`
+}
+
+func TestFieldNames(t *testing.T) {
+	t.Run("new", func(t *testing.T) {
+		var u mockedUser
+		out := RawFieldNames(&u)
+		expected := []string{"`id`", "`user_name`", "`sex`", "`uuid`", "`age`"}
+		assert.Equal(t, expected, out)
+	})
+}