事务的回滚对于拥有自增主键的表来说，insert的数据是被删除，update和delete的数据是被恢复

事务的回滚对于拥有自增主键的表来说，insert的数据是被删除，update和delete的数据是被恢复

建表代码：create table users(userid int primary key identity(1,1),uname varchar(100),utime datetime)

c#调用代码private void selectInsertSelectUpdateSelectDeleteSelect(){SqlConnection conn = getConn();SqlTransaction tran = null;try{conn.Open();tran = conn.BeginTransaction();SqlDataAdapter cmdSelect = new SqlDataAdapter("select * from users", conn);cmdSelect.SelectCommand.Transaction = tran;DataTable dtSelect = new DataTable();SqlCommand cmdInsert = new SqlCommand("insert into users(uname, utime) values('cc', GETDATE())", conn);cmdInsert.Transaction = tran;SqlDataAdapter cmdSelect_1 = new SqlDataAdapter("select * from users", conn);cmdSelect_1.SelectCommand.Transaction = tran;DataTable dtSelect_1 = new DataTable();SqlCommand cmdUpdate = new SqlCommand("update users set utime=getdate()", conn);cmdUpdate.Transaction = tran;SqlDataAdapter cmdSelect_2 = new SqlDataAdapter("select * from users", conn);cmdSelect_2.SelectCommand.Transaction = tran;DataTable dtSelect_2 = new DataTable();SqlCommand cmdDelete = new SqlCommand("delete from users where userid=(select MAX(userid) from users)", conn);cmdDelete.Transaction = tran;SqlDataAdapter cmdSelect_3 = new SqlDataAdapter("select * from users", conn);cmdSelect_3.SelectCommand.Transaction = tran;DataTable dtSelect_3 = new DataTable();cmdSelect.Fill(dtSelect);bindData(dtSelect, gv);cmdInsert.ExecuteNonQuery();cmdSelect_1.Fill(dtSelect_1);bindData(dtSelect_1, gv1);cmdUpdate.ExecuteNonQuery();cmdSelect_2.Fill(dtSelect_2);bindData(dtSelect_2, gv2);cmdDelete.ExecuteNonQuery();cmdSelect_3.Fill(dtSelect_3);bindData(dtSelect_3, gv3);/** 此处丢异常，然后回滚*/int x = 1;int y = 0;int z = x / y;tran.Commit();}catch (Exception ex){tran.Rollback();Response.Write("fuck  有异常，老子回滚了");}finally{conn.Close();}}private void bindData(DataTable dt, GridView gv){gv.DataSource = dt;gv.DataBind();}private SqlConnection getConn(){string connStr = "server=.;uid=sa;pwd=123456;database=test;";return new SqlConnection(connStr);}