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Basic concepts of three states:1, temporary State (Transient): Also called Free State, exists only in memory, and there is no corresponding data in the database. Object created with new, it is not persisted, is not in session, the object in this state is called a temporary object;2, Persistence State (persistent): associated with the session and has corresponding data in the database. has been persisted and added to the session cache. objects, such as

Basic concepts of three states:1, transient State (Transient): Also called Free State, exists only in memory, and there is no corresponding data in the database. Object created with new, it is not persisted, is not in session, the object in this state is called a temporary object;2, Persistence State (persistent): associated with the session and has corresponding data in the database. has been persisted and added to the session cache. objects, such as

Basic concepts of three states:1, transient State (Transient): Also called Free State, exists only in memory, and there is no corresponding data in the database. Object created with new, it is not persisted, is not in session, the object in this state is called a temporary object;2, Persistence State (persistent): associated with the session and has corresponding data in the database. has been persisted and added to the session cache. objects, such as

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Principle of C language free function ---------- [Badboy], free function badboy Today, I saw such a problem on the Internet: "If malloc has a string of memory, then it changes the size of the string and asks if some memory is not released ." I did not think about this issue carefully before. Of course, I think it will definitely be released, but I have never understood the principle of

Principle of C language free function ---- [Badboy], free function badboyToday, I saw such a problem on the Internet: "If malloc has a string of memory, then it changes the size of the string and asks if some memory is not released ." I did not think about this issue carefully before. Of course, I think it will definitely be released, but I have never understood the principle of

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This is a "free online game" of the era, almost all online games have played a "free" or even "permanent free" signs. But whether it is really "free" is not easy to say, many of the young players trapped in the "free online games" is a huge expense, even many of them to play

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10 websites that provide free PHP script download and 10 free php scripts. 10 websites that provide free PHP script downloads and 10 free php scripts. This article will focus on the free resource download site for 10 PHP scripts. We previously recommended 16 popular websites

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Linux monitoring tool introduction series-free and linux monitoring series-free In Linux, we can view and monitor the system memory usage. The most common command is free. The free command is actually very simple, and the parameters are also very simple, but you may not know much about it. The following is a summary o

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