juniper learning path

Document directory Index Parts Arithmetic Operation Common functions Learning: Python learning path (3): Introduction to sequence Python has six built-in sequences: List, tuples, strings, Unicode strings, buffer objects, and xrange objects. We mainly talk about lists and metadata groups. The biggest difference between the two is that the list can be modifie

Learning: Python learning path (6): class and Object In layman's terms, classes are definitions, and objects are entities. Simply put, people are classes, and Gao Peng is an object.Attribute Attributes include instance attributes and class attributes. Let's take a look at the previous Code: Class Fruit: Price = 0 Def _ init _ (self ): Self. color = 'red'

{ Throw NewIllegalStateException (V.getclass (). GetName () + "isn't a" + "view that can be bounds by This Simpleadapter "); } } } } }The GetView method calls directly a method called Createviewfromresource, which first determines whether Convertview is empty, and this convertview is a cached view, because we know that Each listview is actually only a few items back and forth, and when an item slides out of the screen, the item is recyc

1. The so-called manifest file is the Androidmanifest.xml file in the project. This file is, however, of great use. Analogy: The app's name, icon. App supports the version number of the app's package name and so on. I'll show you the role of each of the parameters in this list file below. Display units in 2.android 1..PX (pixels) The general HVGA represents 320*480 pixels, which is used much more2..dip or DP (device independent pixels). This has something to do with device hardware. Gener

to set the number of bulk searches for a deferred retrieval policy or an immediate retrieval policy. Bulk retrieval can reduce the number of SELECT statements and improve the performance of deferred or immediate retrieval operations.　　　　4. Multiple-to-one and single-to-a-link retrieval strategies1) As with 　　2) If the Fetch attribute is set to join, then the Lazy property is ignored 3) The advantage of an urgent left outer connection retrieval strategy is that fewer SELECT statements are used

hibernate.jdbc.batch_size: Sets the batch size for bulk delete , batch update and BULK INSERT, similar to the meaning of setting buffer size. The larger the batchsize, the lower the number of times a batch operation sends SQL to the database, the faster it becomes. 2 test result is that when batch size=0, using hibernate to delete 10,000 records for Oracle database takes 25 seconds, Batch Size = 50, delete only need 5 seconds! Oracle Database batchsize=30 is the right time . 　　　　 　　　 1 invali

Java learning path-Spring's HttpInvoker LearningHessian and Burlap are both based on HTTP, and both of them solve the firewall penetration problem caused by RMI. However, when the passed RPC message contains a serialized object, RMI wins Hessian and Burlap. Hessian and Burlap both adopt private serialization mechanisms, while RMI uses Java serialization mechanisms. If the data model is very complex, the Hes

1. The project document so-called list androidmanifest.xml documents. The file, but with great leverage, for example: app name. icons, app-supported version apps, and more. I'll show you the role of each of the parameters in this list file below. To access the Drawable constants of the R.java file, use the icon's ic_launcher under this constant as the app icons android:label= "@string/app_name" app name An activity represents a form android:name= "com.example.hello.MainActivity" Th

, Intent data) { Super. Onactivityresult (Requestcode, ResultCode, data); if(ResultCode = =RESULT_OK) {Mtextview.settext (Data.getstringextra ("Text")); Displays the recognized text Mwebview.loadurl (Data.getstringextra ("Text")); Load the identified content as a URL into WebView} }}4. Add Webcam and access network permissions:The method of using this tool class is very simple, only need to use a zxingscannerview as the whole activity layout, and then set the callback interface to parse t

(I am writing in the same Applicationcontext.xml file, but it does not affect the test function) Now let's write the test code, deploy the project to tomcat before running the code below, and run the Tomcat1 package test; 2 Import java.util.List; 3 Import Org.springframework.context.ApplicationContext; 4 Import Org.springframework.context.support.ClassPathXmlApplicationContext; 5 Import Service. Bookservice; 6 Import entity. Book; 7 public class Test {8 public static void Main (string[]

Java learning path-Burlap LearningToday, let's learn about Burlap. Burlap is an XML-based Remote Call technology, but unlike other XML-based remote technologies (such as SOAP or XML-RPC), Burlap's message structure is as simple as possible, no additional external Definition Language (such as WSDL or IDL) is required ). Burlap and Hessian are the same to a large extent. The only difference is that Hessian me

How to Learn: Oracle SQL learning path (4): Analyzing function statistics (2) Preface I have written several blog posts about analysis functions. However, I have always been not satisfied with what I wrote, and I cannot tell where the problem is. The biggest problem is that I am not satisfied, but completely confused, and where I am not satisfied, what should I say clearly? Or the content is too thin. MAX a

2019 Machine Learning: Tracking the path of AI developmentHttps://mp.weixin.qq.com/s/HvAlEohfSEJMzRkH3zZtlwThe time has come to "guide" the "Smart assistant". Machine learning has become one of the key elements of the global digital transformation, and in the enterprise domain, the growth of machine learning use cases

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