fix: refactor Delete method (#5271)

* fix: refactor Delete method and add test

* fix: add modify record into CHANGELOG

CHANGELOG.md

@@ -10,6 +10,7 @@
 - [fix: refactor InsertValue method](https://github.com/beego/beego/pull/5267)
 - [fix: modify InsertOrUpdate method, Remove the isMulti variable and its associated code](https://github.com/beego/beego/pull/5269)
 - [refactor cache/redis: Use redisConfig to receive incoming JSON (previously using a map)](https://github.com/beego/beego/pull/5268)
+- [fix: refactor DeleteSQL method](https://github.com/beego/beego/pull/5271)
 
 ## ORM refactoring
 - [introducing internal/models pkg](https://github.com/beego/beego/pull/5238)

client/orm/db.go

@@ -713,14 +713,8 @@ func (d *dbBase) Delete(ctx context.Context, q dbQuerier, mi *models.ModelInfo,
 		args = append(args, pkValue)
 	}
 
-	Q := d.ins.TableQuote()
+	query := d.DeleteSQL(whereCols, mi)
 
-	sep := fmt.Sprintf("%s = ? AND %s", Q, Q)
-	wheres := strings.Join(whereCols, sep)
-
-	query := fmt.Sprintf("DELETE FROM %s%s%s WHERE %s%s%s = ?", Q, mi.Table, Q, Q, wheres, Q)
-
-	d.ins.ReplaceMarks(&query)
 	res, err := q.ExecContext(ctx, query, args...)
 	if err == nil {
 		num, err := res.RowsAffected()
@@ -738,6 +732,35 @@ func (d *dbBase) Delete(ctx context.Context, q dbQuerier, mi *models.ModelInfo,
 	return 0, err
 }
 
+func (d *dbBase) DeleteSQL(whereCols []string, mi *models.ModelInfo) string {
+	buf := buffers.Get()
+	defer buffers.Put(buf)
+
+	Q := d.ins.TableQuote()
+
+	_, _ = buf.WriteString("DELETE FROM ")
+	_, _ = buf.WriteString(Q)
+	_, _ = buf.WriteString(mi.Table)
+	_, _ = buf.WriteString(Q)
+	_, _ = buf.WriteString(" WHERE ")
+
+	for i, col := range whereCols {
+		if i > 0 {
+			_, _ = buf.WriteString(" AND ")
+		}
+		_, _ = buf.WriteString(Q)
+		_, _ = buf.WriteString(col)
+		_, _ = buf.WriteString(Q)
+		_, _ = buf.WriteString(" = ?")
+	}
+
+	query := buf.String()
+
+	d.ins.ReplaceMarks(&query)
+
+	return query
+}
+
 // UpdateBatch update table-related record by querySet.
 // need querySet not struct reflect.Value to update related records.
 func (d *dbBase) UpdateBatch(ctx context.Context, q dbQuerier, qs *querySet, mi *models.ModelInfo, cond *Condition, params Params, tz *time.Location) (int64, error) {

client/orm/db_test.go

@@ -128,3 +128,60 @@ func TestDbBase_InsertValueSQL(t *testing.T) {
 		})
 	}
 }
+
+func TestDbBase_DeleteSQL(t *testing.T) {
+	mi := &models.ModelInfo{
+		Table: "test_table",
+	}
+
+	testCases := []struct {
+		name string
+		db   *dbBase
+
+		whereCols []string
+
+		wantRes string
+	}{
+		{
+			name: "delete by dbBase with id",
+			db: &dbBase{
+				ins: &dbBase{},
+			},
+			whereCols: []string{"id"},
+			wantRes:   "DELETE FROM `test_table` WHERE `id` = ?",
+		},
+		{
+			name: "delete by dbBase not id",
+			db: &dbBase{
+				ins: &dbBase{},
+			},
+			whereCols: []string{"name", "age"},
+			wantRes:   "DELETE FROM `test_table` WHERE `name` = ? AND `age` = ?",
+		},
+		{
+			name: "delete by dbBasePostgres with id",
+			db: &dbBase{
+				ins: newdbBasePostgres(),
+			},
+			whereCols: []string{"id"},
+			wantRes:   "DELETE FROM \"test_table\" WHERE \"id\" = $1",
+		},
+		{
+			name: "delete by dbBasePostgres not id",
+			db: &dbBase{
+				ins: newdbBasePostgres(),
+			},
+			whereCols: []string{"name", "age"},
+			wantRes:   "DELETE FROM \"test_table\" WHERE \"name\" = $1 AND \"age\" = $2",
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+
+			res := tc.db.DeleteSQL(tc.whereCols, mi)
+
+			assert.Equal(t, tc.wantRes, res)
+		})
+	}
+}