From ee0978a108cdd0b6e9bf2f90b647026e1b71814c Mon Sep 17 00:00:00 2001
From: Lunny Xiao <xiaolunwen@gmail.com>
Date: Sat, 28 Oct 2023 11:58:27 +0800
Subject: [PATCH] add new package executors

---
 executors/querier.go      | 33 +++++++++++++++++++++++++++++++++
 executors/querier_test.go | 35 +++++++++++++++++++++++++++++++++++
 2 files changed, 68 insertions(+)
 create mode 100644 executors/querier.go
 create mode 100644 executors/querier_test.go

diff --git a/executors/querier.go b/executors/querier.go
new file mode 100644
index 00000000..817d6a67
--- /dev/null
+++ b/executors/querier.go
@@ -0,0 +1,33 @@
+// Copyright 2023 The Xorm Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package executors
+
+import (
+	"context"
+
+	"xorm.io/xorm/v2"
+)
+
+type Querier[T any] struct {
+	client xorm.Interface
+}
+
+func NewQuerier[T any](c xorm.Interface) *Querier[T] {
+	return &Querier[T]{
+		client: c,
+	}
+}
+
+func (q *Querier[T]) All(ctx context.Context) ([]T, error) {
+	var result []T
+	return result, q.client.Find(&result)
+}
+
+type Filter interface{}
+
+func (q *Querier[T]) Filter(ctx context.Context, filter ...Filter) ([]T, error) {
+	// implementation
+	return nil, nil
+}
diff --git a/executors/querier_test.go b/executors/querier_test.go
new file mode 100644
index 00000000..2fa11e8b
--- /dev/null
+++ b/executors/querier_test.go
@@ -0,0 +1,35 @@
+// Copyright 2023 The Xorm Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package executors
+
+import (
+	"context"
+	"testing"
+
+	"xorm.io/xorm/v2"
+
+	_ "github.com/mattn/go-sqlite3"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestQuerier(t *testing.T) {
+	type User struct {
+		Id   int64
+		Name string
+	}
+
+	engine, err := xorm.NewEngine("sqlite3", "file::memory:?cache=shared")
+	assert.NoError(t, err)
+	assert.NoError(t, engine.Sync(new(User)))
+
+	// create querier
+	querier := NewQuerier[User](engine)
+
+	users, err := querier.All(context.Background())
+	if err != nil {
+		t.Fatal(err)
+	}
+	assert.Equal(t, len(users), 0)
+}