Move db related basic functions to models/db (#17075)

* Move db related basic functions to models/db

* Fix lint

* Fix lint

* Fix test

* Fix lint

* Fix lint

* revert unnecessary change

* Fix test

* Fix wrong replace string

* Use *Context

* Correct committer spelling and fix wrong replaced words

Co-authored-by: zeripath <art27@cantab.net>

models/engine_test.go

@@ -0,0 +1,35 @@
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package models
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/modules/setting"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestDumpDatabase(t *testing.T) {
+	assert.NoError(t, db.PrepareTestDatabase())
+
+	dir, err := ioutil.TempDir(os.TempDir(), "dump")
+	assert.NoError(t, err)
+
+	type Version struct {
+		ID      int64 `xorm:"pk autoincr"`
+		Version int64
+	}
+	assert.NoError(t, db.DefaultContext().Engine().Sync2(new(Version)))
+
+	for _, dbName := range setting.SupportedDatabases {
+		dbType := setting.GetDBTypeByName(dbName)
+		assert.NoError(t, db.DumpDatabase(filepath.Join(dir, dbType+".sql"), dbType))
+	}
+}