Programmer Think

Hello, I'm Lin Sanxin. Vuex is a special for Vue JS application development state management mode. It uses centralized storage to manage the state of all components of the application, and uses corresponding rules to ensure that the state changes in a predictable way.Under what circumstances should I use Vuex?Vuex can help us manage shared stat ...

The PreparedStatement interface inherits from the Statement interface PreparedStatement is recommended instead of Statement Advantages of Preparedstatement: Prevents SQL injection Faster execution than Statement Support batch processing configuration file Some values that are frequently dynamically modified are recommended to be pla ...

Compact row overflow: Dynamic row overflow: Under what circumstances will overflow Principle: as long as the sum of one line of records exceeds 8 k，Will overflow. Variable field types include blob,text,varchar Index optimization The main function of index is to find and sort. Index optimization is the most basic optimization me ...

* [StandardScaler and MinMaxScaler How to choose?](about:blank#StandardScaler__MinMaxScaler__210) * [Missing value](about:blank#_226) * * [Missing value filling impute.SimpleImputer](about:blank#_imputeSimpleImputer_244) * [Handling typing features: coding and dummy variables](about:blank#_370) * * [preprocessing.LabelEnco ...

When we learn the basic use of reflection, I will use a SmallPineapple class as a template. First, let's get familiar with the basic composition of this class: properties, constructors and methods public class SmallPineapple { public String name; public int age; private double weight; // Only you know your weight public SmallP ...

Terminate the query in advance (for example, when Limit is used, the query will be terminated immediately after finding a satisfactory number of result sets) Optimized sorting (in the old version, MySQL will use two transfer sorts, that is, first read the row pointer and the fields to be sorted, sort them in memory, and then read the data row ...

Hello, I'm Lin Sanxin. Vue has implemented a set of content distribution API s, using the < slot > element as an exit to host the distribution content. This is the description on the Vue document. Specifically, a slot is a 'space' that allows you to add content to a component. Do you really know how a slot is "inserted"? I hope ...

java interview questions from basic to advanced I Basics What are the characteristics of Java object-oriented and how to apply it Object oriented programming is an idea of using class and object programming. All things can be classified. Class is a high abstraction of things in the world. Different things have different relationships, the en ...

1, ThreadLocal [resolve shared variables] 1.ThreadLocal is called thread variable, which means that the variable filled in ThreadLocal belongs to the current thread. This variable is isolated from other threads, that is, this variable is unique to the current thread. ThreadLocal creates a copy of the variable in each thread, so each thread can ...

1. In the distributed system environment, a method can only be executed by one thread of one machine at the same time; 2. High availability and high performance acquisition lock and release lock; 3. Reentrant feature; 4. Have lock failure mechanism to prevent deadlock; 5. It has the non blocking lock feature, that is, if the lock is not obt ...