initial commit

FreeSql.DbContext/UnitOfWork/IUnitOfWork.cs

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+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Data.Common;
+
+namespace FreeSql
+{
+    /// <summary>
+    /// 工作单元
+    /// </summary>
+    public interface IUnitOfWork : IDisposable
+    {
+        /// <summary>
+        /// 该对象 Select/Delete/Insert/Update/InsertOrUpdate 与工作单元事务保持一致，可省略传递 WithTransaction
+        /// </summary>
+        IFreeSql Orm { get; }
+
+        /// <summary>
+        /// 开启事务，或者返回已开启的事务
+        /// </summary>
+        /// <param name="isCreate">若未开启事务，则开启</param>
+        /// <returns></returns>
+        DbTransaction GetOrBeginTransaction(bool isCreate = true);
+
+        IsolationLevel? IsolationLevel { get; set; }
+
+        void Commit();
+
+        void Rollback();
+
+        /// <summary>
+        /// 工作单元内的实体变化跟踪
+        /// </summary>
+        DbContext.EntityChangeReport EntityChangeReport { get; }
+
+        /// <summary>
+        /// 用户自定义的状态数据，便于扩展
+        /// </summary>
+        Dictionary<string, object> States { get; }
+    }
+}