In actual work, we often need to judge a variable or expression and perform different operations based on different conditions. Usually, we need to use the if…else statement. But the if…else statement is too lengthy and cumbersome and can be optimized using the ternary operator. Taking the code to implement a state machine as an […]
Tag: statements
[pelin-yi] Branch and loop statements in C language
Structure of C language In life, you will find that everything that happens around us can be done using sequential statements, branch statements, loop statements, Or it consists of a combination of the above three statements. From this, we can use C language to describe problems that occur in life and solve problems through C […]
What types of javascript loop statements are there, and what are the applications of javascript loop statements?
Hello everyone, this article will focus on what are the loop statements in javascript. What types of javascript loop statements are a thing that many people want to understand. If you want to understand the application of javascript loop statements, you need to understand the following things first. URL of this article: https://www.cnblogs.com/zichliang/p/17412968.html There are […]
Deployment of jinja2 template on Ansible and demonstration of control statements, operation methods, and some filters
Table of Contents 1.Introduction to jinja2 1. Introduction to jinja2 template on Ansible 2.Advantages of jinja2 template 2. template deploys jinja2 template 1.Example 2.template module parameters 3. Jinja2 control statements 1.for loop 2.if judgment statement 3.setSet variables 4. Jinja2 expression operation and attribute judgment 1. Comparison operations 2. Logical operations 3. Arithmetic operations 4.Member operation […]
MSQL Series (7) Mysql Practice – The Difference Between SQL Statements Join, exists, and in
Mysql practice-the difference between SQL statements Join, exists, and in Earlier we explained the storage structure of the index, the index structure of B + Tree, the leftmost matching principle of the index, and the optimization suggestions for commonly used SQL statements. Today we will explain in detail the three joins, exist, and in that […]
Loop structure while, for, do-while, goto statements in C language
1. while loop C language provides 3 types of loop statements, while This is one of them, and I will introduce it next. while statement. while The grammatical structure of the statement and if The statements are very similar. What’s right between if and while? if(expression) Statement; while(expression) Statement; //If the loop body wants to […]
MySQL database (database introduction | classification | basic usage | basic SQL statements for libraries, tables, and records)
Article directory MySQL database 1. History of evolution of data access 2. Development History of Data Storage 3. The nature of database 4. Classification of databases 5. Basic use 6. Production of system services 7. Introduction to SQL and nosql 8. Introduction to MySQL database 1. What is a database? 2.The role of database 10. […]
Python – Verification code processing & executing JavaScript statements
1. Verification code processing 1. Overview & Solutions to Bypass Verification Code Many websites have added verification code methods for identifying text, identifying pictures, and dragging puzzle pieces to the login page to prevent crawlers, malicious registration, etc. If you are doing automation and you need to bypass the verification code to enter the next […]
Essential | Complete encapsulation operations for SQL statements
Before encapsulating SQL statements, we need to know what DAO encapsulation and entity classes are, as well as the encapsulation of JDBC tool classes and the specific process of connecting to the database. Benefits of encapsulating SQL statements: After encapsulating the SQL statement, you can import the package and use it in other projects, which […]
MyBatis dynamic statements where/if, set, trim, choose/when/otherwise, foreach tag, and sql fragments
1. Environment preparation 1. Prepare the database and insert data CREATE TABLE `t_emp` ( emp_id INT AUTO_INCREMENT, emp_name CHAR(100), emp_salary DOUBLE(10, 5), PRIMARY KEY (emp_id) ); INSERT INTO `t_emp`(emp_name,emp_salary) VALUES(“tom”,200.33); INSERT INTO `t_emp`(emp_name,emp_salary) VALUES(“jerry”,666.66); INSERT INTO `t_emp`(emp_name,emp_salary) VALUES(“andy”,777.77); 2. Write entity classes package com.suchuanlin.pojo; import lombok.AllArgsConstructor; import lombok.Data; import lombok.NoArgsConstructor; @Data @NoArgsConstructor @AllArgsConstructor public class […]