Programmer Think

The Spring transaction annotation @Transactional could have guaranteed atomicity, and the entire transaction could have guaranteed rollback if there were errors within the transaction, but adding try catch or transaction nesting could have caused the transaction rollback to fail.Test a wave. Get ready Build two tables to simulate two data opera ...

Preface Think about it, I don't know what to add. As the saying goes, there is an egg to use in actual combat. So I use Data Binding to achieve the list effect of RecyclerView to draw a perfect end to this learning. Text text Not much nonsense. In order to achieve the effect, first of all, we must put the Recycler View of MainActivity in place. ...

time Three Forms of Time Time stamp: Typically, a time stamp represents an offset calculated in seconds starting at 00:00 on January 1, 1970. We run "type" (time. time ()) and return the float type. Format String:'1999-12-06' ''' % y-Binary Year Representation (00-99) % Y4-digit Annual Representation (000-9999) % m m ...

Six, == Optinal== optional type (difficulty): One of the characteristics of swift grammar is that it is a reflection of type safety, Int?,float! Note that the symbols in the back must be close to the type in front, and there can be no blank in the middle; Only Optional type can be null (nil in oc), which ensures that non-optional objects ...

This article is reproduced from Nan Ke Meng In the previous article, Mybatis Series (2) - Introduction to Configuration (Mybatis Source Chapter), through a simple analysis of mybatis source code, we can see that in the mybatis configuration file, under the configuration root node, configurable properties, type Aliases, plugins, objectFactory, o ...

Environmental preparation: Global installation jade: NPM install jade-g Initialize the project package.json: npm init --yes After the installation is complete, you can use jade --help to view the command line usage of jade 1. Create a new index.jade file under the project directory inde.jade code: 1 doctype html 2 html 3 head 4 met ...

Full Stack Engineer Development Manual (Author: Luan Peng) js series of tutorials 4-function, function parameters In js, function itself belongs to one kind of object, so it can be defined and assigned as the attribute of object or the parameter of other functions. The function name is only a reference to the object class of the functio ...

Before writing this blog, I first read Spring in action, and then read some articles about Spring transaction management on the internet. I don't feel that they are complete. Here, I will summarize the knowledge of the book and the Internet about the transaction. The reference articles are as follows: Detailed explanation of Spring transac ...

Recently, we need to implement a histogram in our project and have an animation when we refresh the histogram (the histogram is dynamically drawn). The common way to realize the histogram is to inherit View class, copy onDraw() method, draw the corresponding rectangle (drawRect method) and text (drawText method) in onDraw() method according t ...

1. Parsing xml using dom4j * dom4j is an organization that provides parser dom4j for xml parsing* dom4j is not part of javase. What do you need to do to use the first step?*** Import dom4j to provide jar packagesCreate a folder libCopy the jar package under lib.Right-click on the jar package, build path -- add to build path- See the jar pack ...