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SELECT statementIf,elseIf is the meaning, else is the other meaning, if followed by () in parentheses to determine the condition, if the condition is met, enter the IF statement to execute the command. If the non-conformance does not enter the IF

Program flow is the order in which the program needs to execute.Change the process of program control: There are 2 methods, branching (selection) and looping.Branching: Multiple choices, with if structure, switch structure.Loops: Run repeatedly with

Our mobile phone Address Book is the technology HTML5 SQLite plus jquery for the single-machine cache feature Avatar is rendered with base 64 /*************************************//* Helman, heldes.com *//* Helman at heldes dot com */*

Words and essays walk, pen to walk, essays, as you pleases. Purely individual Learning Analysis summary, if the viewer also please do not Sik Sik Yuen experience.1.IF selection StructureWhat is the IF structure: the If selection structure is a

The following is a database operation code commonly used in self-developed applications. There are two files below: configuration files and operation database files, finally, we briefly list the call methods of this example class. The following is a

1. A question describes how an SQL statement is executed in a database? I believe many people will be interested in this issue. Of course, it is a huge problem to fully describe the lifecycle of an SQL statement in the database, it covers a series

Provides various official and user-released code examples. For code reference, you are welcome to exchange and learn how to output the data of an unlimited classification table into a tree structure. /*** Function to obtain the tree structure. Note:

Web applications tend to face multi-user environments, where concurrent write control is almost a skill that every developer must master. This paper mainly introduces the principle and use of Yii2.0 optimistic lock and pessimistic lock, hoping to

Blank space is important in Python. In fact, the blank at the beginning of the line is important. It is called indentation. The blank spaces (spaces and tabs) at the beginning of the logical line are used to determine the indentation level of the

Memory Management OptimizationsThe Redis hash is a hashmap within value, and if the map has fewer members, the map is stored in a compact format similar to one-dimensional linearity, which eliminates the memory overhead of a large number of pointers,

Route rewriting is an important basic function in Web servers. Through route rewriting, you can structure URLs and make them more semantic (good for SEO ). In addition, shared URLs may become invalid due to program route changes, and rewrite of

"Problem description"In order to meet the anniversary Moon High School playground began construction. Soon after the playground found a lot of tombs in these tombs there are many treasures. However, the students gradually found that the school's

PHP tutorial MySQL Tutorial full database Tutorial Connection class*/Class MySQL {Private $db _host; Database HostPrivate $db _user; Database user NamePrivate $db _pwd; Database User name passwordPrivate $db _database; Database namePrivate $conn;

the types of statements include : Declaration statements, expression statements, select statements, loop statements, jump statements, exception statements1. Declare statement citation: Enter a new variable or constant. Variable declarations can

A. String Insertion To provide maximum flexibility for developers to handle string values, PHP provides a literal insert and content insertion A method. Double quotation marks provide maximum flexibility because both the variable and the transfer

Create a table: Create Table tablename (colname datatype [not null] {, Colname datatype [not null]...} [, Primary key (colname {, colname...})]; Note: |, [], {},... won't appear in SQL, so mark it Two simple select statements: Select

Difference between a do while loop and A WHILE LOOP1. The do while loop first executes the loop body and then judges the loop condition. If it is true, the next loop is executed; otherwise, the loop is terminated;The while loop first determines the

Workflow development Core Process Analysis 1. Drawing flowchart The first step in the development of Activiti is to draw a flowchart according to the requirements, the flowchart defines how the process is carried out, the conditions of the process

Statement:The types of statements include declaration statements, expression statements, select statements, loop statements, jump statements, exception statements.One: declaration statement: Into the new variable and solid. Variable declarations can

Statement:The types of statements include declaration statements, expression statements, select statements, loop statements, jump statements, exception statements.One: declaration statement: Into the new variable and solid. Variable declarations can