C＃中SQL脚本的执行流程

Question

如果c＃中有任何失败，这不是回滚sql事务的重复问题。 但是这个问题是基于上一个问题的内容。 感谢所有对我的最后一个问题发表意见的人。我尝试了所有这些解决方案，最终发现在多语句事务中不允许在我的应用程序（DDL）中使用脚本。

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";

并以如下所示的相同方式执行所有这些操作：

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");
}

即使我只写了这段代码，现在我对这些脚本的执行还是有些怀疑。 单击按钮，一次即可执行上面显示的所有脚本。 我想知道的是，这些脚本会一次全部执行吗？意味着，一次执行这些脚本时是否有执行失败的可能？数据库断开或其他任何错误的机会。

让我向您展示一个我要问的示例：如果以某种方式执行了前三个脚本，而所有其他脚本都失败了，那么是否有自动回滚的机会？

还是我的代码在执行整个代码之前检查是否有任何错误或失败的机会，这样就不需要回滚了？

任何人都可以通过他们的宝贵建议和想法来支持我。

任何帮助将非常感激..

Answer 1

我已经给出了大概的样子的骨架。 您可以告诉我您想在什么情况下回滚什么，而不是什么情况。

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
        }