sql single user mode

If you call the database using a single-state mode, the method has a return result set, and the database connection object I know that the connection object is destroyed at the time of destruction, ask how to release the returned result set, I know can be assigned to the array in the method and then return the array, release the result set, but sometimes need to return the result set instead of the array, p

Source: http://blog.csdn.net/haoel/archive/2009/03/26/4028232.aspx Singleton design mode for a single instance Chen HaoPreface The Singleton design pattern for a single instance may be the most widely discussed and used design pattern, which may be the most frequently asked design pattern during interviews. This design pattern mainly aims to show only one class i

Singleton mode: A class has only one instance.Singleton mode (Singleton pattern): A singleton pattern ensures that a class has only one instance and instantiates itself and provides this instance to the entire system, which is called a singleton class. It provides a way to access the global interview.The main points of the singleton pattern are three: one is that a class can have only one instance, and the

. There is only one instance that does reduce memory consumption, but I don't think it's usingsingle-case modeThe reason. I think that usingsingle-case modeThe time is when there are multiple instances of an instance that can cause a program logic error. Like an ordered number generator, how can you allow more than one application to exist? The main purpose of the singleton mode is to ensure that only one instance of a class is present in a Java appli

fact it is not a "strict" version, and in practice, it is possible to encounter an object that initiates a call that cannot instantiate a singleton object in another way, or create multiple instances. (Someone has discussed this problem with me before, saying that the user should strictly follow the interface to use, when actually singleton is an object, we can not guarantee that the user will not use othe

fact it is not a "strict" version, and in practice, it is possible to encounter an object that initiates a call that cannot instantiate a singleton object in another way, or create multiple instances. (Someone has discussed this problem with me before, saying that the user should strictly follow the interface to use, when actually singleton is an object, we can not guarantee that the user will not use othe

; }; = ^ (Uicolor *color) { = color; }; [Self.navigationcontroller PUSHVIEWCONTROLLER:SECONDVC Animated:yes]; [SECONDVC release];}Iv. single-Case transmission valueSingleton, simply speaking, is a single instance object, no matter how many times it is created, it is unique and has only one.The use of a single case is not limited, but need t

Singleton mode is one of the object's creation patterns, guaranteeing that a class has only one instance and provides a global access point to access it.Under what circumstances is a singleton used:1, some manager classes. such as voice manager, scene manager, User Manager, etc.2, some auxiliary functions.Unity in the single implementation is divided into two, on

[SSO single-point series] (4): Return of user information after cas server logon, ssocas Next, in the previous article, we described how to add a verification code on the cas server logon page and log on. Once the cas server is successfully verified, we will jump to the client. After you jump to the client, let's think about it. The client always needs to obtain user