feat: add basic MySQL sync functionality (#1575)

* feat: add sync module to bi-sync mysql

* feat: fix the delay problem

* feat: fix go mod

* feat: fix the varchar(100) parse error

* fix: fix go.mod space inconsistency

* fix: fix go.mod space inconsistency

* fix: use sql builder instead of concatenation

* fix: remove serverId

* fix: fix file is not `gofumpt`-ed (gofumpt) error

sync/utils.go

@@ -0,0 +1,72 @@
+// Copyright 2023 The Casdoor Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sync
+
+import (
+	"log"
+
+	"github.com/Masterminds/squirrel"
+	"github.com/xorm-io/xorm"
+)
+
+func GetUpdateSql(schemaName string, tableName string, columnNames []string, newColumnVal []interface{}, oldColumnVal []interface{}) (string, []interface{}, error) {
+	updateSql := squirrel.Update(schemaName + "." + tableName)
+	for i, columnName := range columnNames {
+		updateSql = updateSql.Set(columnName, newColumnVal[i])
+	}
+
+	for i, columnName := range columnNames {
+		updateSql = updateSql.Where(squirrel.Eq{columnName: oldColumnVal[i]})
+	}
+
+	sql, args, err := updateSql.ToSql()
+	if err != nil {
+		return "", nil, err
+	}
+
+	return sql, args, nil
+}
+
+func GetInsertSql(schemaName string, tableName string, columnNames []string, columnValue []interface{}) (string, []interface{}, error) {
+	insertSql := squirrel.Insert(schemaName + "." + tableName).Columns(columnNames...).Values(columnValue...)
+
+	return insertSql.ToSql()
+}
+
+func GetDeleteSql(schemaName string, tableName string, columnNames []string, columnValue []interface{}) (string, []interface{}, error) {
+	deleteSql := squirrel.Delete(schemaName + "." + tableName)
+
+	for i, columnName := range columnNames {
+		deleteSql = deleteSql.Where(squirrel.Eq{columnName: columnValue[i]})
+	}
+
+	return deleteSql.ToSql()
+}
+
+func CreateEngine(dataSourceName string) (*xorm.Engine, error) {
+	engine, err := xorm.NewEngine("mysql", dataSourceName)
+	if err != nil {
+		return nil, err
+	}
+
+	// ping mysql
+	err = engine.Ping()
+	if err != nil {
+		return nil, err
+	}
+
+	log.Println("mysql connection success……")
+	return engine, nil
+}