pros and cons of erp

developers do not need to consider the logical structure of data, only the business data entities. Hibernate Disadvantages of:1 and inflexible . Since the operations are all objects, it is inconvenient compared to using traditional SQL statements. 3 and achieve complexity . and many complex query SQL statements are difficult to query with hibernate . Therefore, it is difficult for the program to be tuned. 3 , Big Data processing is slow . The transformation of the object model and the relationa

developed, network latency-that is, the interval between a user sending a request to a server to make a response-requires careful consideration. Not giving users a clear response, without proper pre-reading data, or improper handling of XMLHttpRequest, will make users feel delayed, which users do not want to see, but they do not understand. A common solution is to use a visual component to tell the user that the system is in the background and is reading data and content.(2). Ajax Application S

1. In IOS programming, there are several situations where multithreading is required: UI events must be performed on the mainline thread, others can be performed in the background, and tasks that are time-consuming or blocking threads are finally placed in the background line thread.There are several multithreading techniques for 2.iOS: threads, GCD, and Nsoperationqueue (Operation Queues).3. Threading this technique is more complex, but the thread has a later advantage: the ability to accuratel

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What is the CI framework? What are the pros and cons of yaf comparison?

The pros and cons of several mainstream PHP frameworks

is a very common way of JS use, often add a href= "# # #" That is without is to be compatible with multiple browsers to #是有特定意义的, if there is content behind the #, it will be considered a label, the corresponding tag will be found when clicked, and will jump to the first page when it is not found. The page is not refreshed. # # # #其实是 # and # #的组合, is a meaningless label, just a habit of writing, the principle "relies on the Web page error mechanism, can not be found to do not do".

intended to replace some simple tests. Use exceptions only in exceptional cases!2. Do not refine the exception excessively. Instead of adding exception handling on each statement, it's a good idea to put the entire task inside a try block. If one of the operations fails, you can discard the task immediately.3. Do not "suppress" the exception. For methods that need to advertise the exception, we can use the snapping method to force the exception to be closed, and if there is an exception, the ex

-(void) delay1{ // deferred execution do not use sleep, bad: stuck to the current thread [nsthread Sleepfortimeinterval:3]; NSLog (@ "-----Download Picture-----");}-(void) delay2{ // Once the delay task has been customized, the main current thread will not be jammed (which thread execution of the deferred task depends on where the current code is called) [ Self performselector: @selector (Download:) Withobject:@ "http://555.jpg" afterdelay: 3];}- (void) delay3{//3 seconds back

software platform. Capable of supporting up to 50,000 concurrent connections, thanks to Nginx for choosing Epoll and Kqueue as the development model.Nginx as a Load Balancer server: Nginx can either directly support the internal Rails and PHP programs outside the service, also can support as an HTTP proxy server external services. Nginx is written in C, which is much better than Perlbal, both in terms of system resource overhead and CPU efficiency.2, Nginx configuration is concise, Apache compl

Syntax sugar, equivalent to if (!! num = = false) Num=1; Java-like num=null? 1:numThe following is an answer from a friend who knows:It's just a shorthand method. The advantage is shorter, but in fact the disadvantage is even greater.Do you know exactly when it will become 1?-When NUM has a value of 0 o'clock, it will become 1!--When NUM has a value of Nan (which most likely means an error in the previous calculation), it becomes 1!--In addition, when the incoming value type is wrong, your progr

1. Get is the data that is fetched from the server and post is the data sent to the server.2. Get is the URL where the parameter data queue is added to the Action property of the submission form, and the value corresponds to the field one by one in the form, which is visible in the URL. Post is the HTTP post mechanism that places the fields within the form with their contents in the HTML header, along with the URL address referred to by the Action property. The user does not see the process.3. F

Reference Answer:In iOS, it is usually uiwebview to implement, of course, after iOS8 can use Wkwebview to implement. There are several ways to do this: By implementing the UIWebView proxy method to intercept and determine if scheme is a good deal, then iOS calls the local related API to implement: 123 - (BOOLwebview: ( Uiwebview *) Webview Shouldstartloadwithrequest: ( Span class= "crayon-t" >nsurlrequest *) Span class= "crayon-v" >request Navigationtype: (uiw

receive traffic httpclient maximum, httpurlconnection and volley the same, okhttp slightly larger than the former two.5, the average time-consuming networkError description: The condition of the network may affect the network request time.Conclusion: The average time of network request is httpclient maximum, the httpurlconnection is the smallest, and the volley average is higher 10ms~20ms,okhttp than volley 20ms~40ms.The final conclusion is drawn:1 , for new applications, you should be more inc

of mobile terminal (voice, camera, SMS, GPS, Bluetooth, gravity sensor, etc.)(5) The app updates new features that involve submitting audits to each store every time.Suitable for enterprises: games, E-magazines, management applications, the Internet of things, etc. without the need to constantly update the application framework of the app.Mobile Web is ubiquitous, mobile web is currently the only platform to support a variety of device access, like the desktop web, mobile Web support a variety

; } @SEX Public intGetsex () {returnsex; } PublicString getsexdes () {if(Sex = =MALE) { return "male"; } Else { return "female"; }}} @IntDef ({MALE, FEMALE}) @Retention (Retentionpolicy.source) Public@interface SEX {}}If we try to pass a value that is not within the limit when we call the Setsex () method, then the compilation will not pass and there is an error message. Similarly, we can also use @stringdef.As we can see here, @SEX annotations can be placed on attribut

Advantages of CSS Sprites: 1. Reduce the byte of the picture 2. Reduce the HTTP request of the webpage, which greatly improves the performance of the page.3. Solve the problem of Web designers in the name of the picture, just a set of pictures on the name on it, do not need to name every small element, thus improving the production efficiency of the page.Disadvantages of CSS Sprites:1.CSS Sprites in the maintenance of time is more troublesome, if the page background has a little change, generall

of speed at all.⑵ is both an advantage and a disadvantage, Python's open source makes the Python language can not be encrypted, but the current domestic market purely by writing software to sell customers less and fewer, web sites and mobile applications do not need to give customers source code, so this problem is the problem. But over time, many domestic software companies, especially game companies, also began to scale using him.There are too many options for the ⑶ architecture (there is no

= Moviehandler () parser.setcontenthandler (Handler) parser.parse ("Movies.xml") def foo ( Bar=[]): # Bar is an optional parameter, if not specified, the default value is []bar.append ("Mky"); # But there's a problem with this line, and I'll see ... return bar;print foo () print foo () odd = lambda X:bool (x% 2) Nums = [n for n in range (]nums[:] = [n for n-nums if not odd (n)] # Ah, this beautiful print nums This example is primarily for sax_xml reading, as well as defining parameter defaul

Advantages:1, save the configuration, reduce the configuration file size2, compile to see the correct or not, improve efficiencyDisadvantages:1, increase the coupling of the program, because the annotations are stored in the class file, and more scattered2. To make modifications to the configuration requires recompilationThis article is from the "ten-li Rice flower" blog, please be sure to keep this source http://5880861.blog.51cto.com/5870861/1594035Java Annotations