c#中SQL脚本的执行流程

Question

这不是rollback sql transactions if any failed in c#的重复问题。但是这个问题是基于上一个问题的内容。感谢所有对我上一个问题提出意见的人。我尝试了所有这些解决方案，最终发现我在应用程序（DDL）中使用的脚本在多语句事务中是不允许的。

我的整个代码是这样的：

script1 = "CREATE USER " + username + " FROM LOGIN " + username;

script2 = "CREATE ROLE " + rolename;

script3 = @"CREATE ROLE [db_execute] AUTHORIZATION [dbo]
                        GRANT EXECUTE TO [db_execute]";

script4 = @"DECLARE @rolename varchar(max)
                    SET @rolename ='{0}'
                    EXEC sp_addrolemember N'db_execute',@rolename
                    EXEC sp_addrolemember N'db_datareader', @rolename
                    EXEC sp_addrolemember N'db_datawriter', @rolename";
script_result = string.Format(script4, rolename);

script6 = "EXEC sp_addrolemember '{0}', '{1}'";
            outp = string.Format(script6, rolename, username);

script7 = @"select m.name as Member, r.name as Role
                    from sys.database_role_members
                    inner join sys.database_principals m on sys.database_role_members.member_principal_id = m.principal_id
                    inner join sys.database_principals r on sys.database_role_members.role_principal_id = r.principal_id";

并以相同的方式执行所有这些，如下所示：

SqlCommand SqlCmd = new SqlCommand();

//Create User Script Execution
SqlCmd.CommandText = script1;
SqlCmd.Connection = oConnection;        
lvinfo.Items.Add("Executing Create User script in " + dbname + " database");
var answer = SqlCmd.ExecuteNonQuery();

//Checking whether execution completed successfully
if (!answer.Equals(0))
{
lvinfo.Items.Add("Create User script executed successfully in " + dbname + " database");                                                                          
}
else
{
lvinfo.Items.Add("Create User script execution failed in " + db_select.SelectedItem.ToString() + " database");
}

虽然我只写了这段代码，但现在我对这些脚本的执行有些怀疑。上面显示的所有脚本都是一次执行的，只需单击一个按钮。我想知道的是，这些脚本会一次完全执行吗？意味着，一次执行这些脚本时是否有执行失败的机会？以数据库断开连接或任何其他错误的形式出现的可能性。

让我给你看一个我要问的例子：如果前 3 个脚本以某种方式被执行，而所有其余的脚本都失败了，那么是否有机会自动回滚？

或者我的代码是否会在整个代码执行之前检查是否有任何错误或失败机会，以便它永远不需要回滚？

任何人都可以用他们宝贵的建议和想法支持我..

任何帮助将不胜感激..

Answer 1

我已经给出了它可能看起来的骨架。 你可以告诉我你想回滚什么和不回滚什么场景。

var scriptToExecute = new Dictionary<int, string>();
            var scriptToRollback = new Dictionary<int, string>();

        try
        {
            using (SqlCommand SqlCmd = new SqlCommand())
            {
                //Create User Script Execution
                SqlCmd.CommandText = script1;
                SqlCmd.Connection = oConnection;
                lvinfo.Items.Add("Executing Create User script in " + dbname + " database");
                var answer = SqlCmd.ExecuteNonQuery();

                //Checking whether execution completed successfully
                if (!answer.Equals(0))
                {
                    lvinfo.Items.Add("Create User script executed successfully in " + dbname + " database");
                }
                else
                {
                    lvinfo.Items.Add("Create User script execution failed in " + db_select.SelectedItem.ToString() + " database");
                }
            }
        }
        catch (SqlException)
        {
            string rollbackScript = string.Empty;
            for (int i = scriptExecuting; i > 0; i--)
            {
                scriptToRollback.TryGetValue(i, rollbackScript);
                if (!string.IsEmpty(rollbackScript))
                {
                    //Execute the scripts here.
                }
            }
        }



        finally
        {
            //If connection is open then close the active connection
        }