time now in id

actual User id:Some articles refer to it as the real user ID, which is the ID when we log on to the UNIX system. Valid User ID: Defines the rights of the operator. A valid user ID is a property of a process that determines the access to the file

No dead corners understanding Save settings user ID, Set User ID bit, valid user ID, actual user ID, dead corner Save settings Recently, I encountered some problems when I understood how to save and set the user ID, but I found that I was not able

Actual user ID, valid user ID, and set user ID   These concepts are often encountered when reading Unix-related books, but these concepts have not been properly clarified, so that they have been completely understood. I have made a distinction

Variants of the timestamp1,timestamp DEFAULT current_timestamp on UPDATE current_timestampRefreshes the data column when new records are created and existing records are modified2,timestamp DEFAULT Current_timestampThis field is set to the current

Transfer from http://blog.csdn.net/todd911/article/details/16370577In UNIX systems, privileges are based on user and group IDs, and when programs need to add privileges or need access to resources that are not currently allowed, we need to replace

Today, when I was working on a job interview, David asked me to add a title: The difference between ID and name in HTML. A listen to Ah, the HTML ID and name what is the difference, but usually in use, not how to think, just so use it, oh, in fact,

In actual database applications, we often need to get the inserted flag value to write data into the relevant table. But what we usually get is the value we need?Sometimes we use select @ identity to obtain the value we just inserted, such as the

In the UNIX system, privileges, such as being able to change the system's notion of the current date, and access control, such as being able to read or write a particle file, are based on user and group IDs. when our programs need additional

In UNIX systems,Privilege(For example, the expression of the current date and access control can be changed (for example, whether a specific file can be read or written ))Is based on the user ID and group ID. When the program needs to add privileges

  In the article "mantalk ID", the author raised a question: why does access ClientID in the ItemCreated event cause MyButton to fail to respond to the event, in fact, MyButton cannot respond to the event because its client ID has been changed. This