to use if

I don't know which version to use if I want to learn about the ZF framework. which version is the most commonly used by the company? I use the latest zend studio 10.1. when I create the zf framework, there are two versions: 1.1 and 2.0. I don't know

{dede:arclist row= ' 6 ' titlelen= ' imgwidth= ' "imgheight= ' 107 ' addfields= ' body ' typeid= ' ' channelid= ' 1 '} {dede:if Field.shorttitle! = '' } View Details {Else} Please expect {/dede:if} {/dede:arclist} In the list loop, I want to

How to use if and for statements in bash scripts In the bash shell script, we need to understand three execution sequences first. Sequential execution (from left to right, from top to bottom) Select execution (a structure is executed only when

Fault symptom:Logical_test indicates any value or expression in which the calculation result is TRUE or FALSE. For example, A10 = 100 is a logical expression. If the value in cell A10 is 100, the expression is TRUE. Otherwise, the expression is

If none of the orders in the table matches the record. Then, if only the IF (rs.eof) then is judged to cause an error. The correct way to do this is to judge the end of the head pointer: if (RS.BOF and check.eof) then the correct code is as follows:

In addition to the "If,else" form, there are other forms of "if" statements: Copy Code code as follows: if [condition] Then Action Fi The statement performs an action only if condition is true, otherwise the operation

An If statement consists of one or more statements consisting of a Boolean expression.Grammar The IF statement syntax for the LUA programming language is: Copy Code code as follows: if (boolean_expression) Then --[statement (s)

Document directory -EnableAutomaticMigrations -ProjectName -Force -Name -Force -ProjectName -StartUpProjectName -ConfigurationTypeName -ConnectionStringName -ConnectionString -ConnectionProviderName -IgnoreChanges

Each output line of the explain provides information about one table, and each row includes the following columns:1,id the Select identifier. This is the query sequence number for SELECT.2,select_type can be any one typeSimple select (Do not use

If you put the keyword explain,mysql in front of the SELECT statement, it explains how it handles the Select, providing an order about how tables are joined and joined.Each output row of the explain provides information about a table, and each row

Excerpt from: http://www.jb51.net/article/33736.htmWith the help of explain, you know when to add an index to the table to use the index to find records and make the select run faster.If some problems arise due to improper use of the index, you can

Before using RockMongo, You need to determine which verification method to use. If cmd_auth is set to true, the user must use the username and password in MongoDB (by the command db. addUser () add), so the configuration of pai_user, pai_pass and

First step: Create a. NET Core console app.Step Two: Install the Efcore package and design (formerly VS is the EF project template, the core version does not now, all install this tool to create modelstype context, etc.).Tools-->nuget Package

At present we use the computer keyboard mainly has two kinds, one kind is the most desktop computer uses the PS/2 interface keyboard, another kind is the USB keyboard, the keyboard is unable to recognize how to do? 　　1, PS/2 interface keyboard can

From the IOS9, the new features require the APP to access the network request, using HTTPS protocol. But whether or not the developer will allow HTTP requests will not fail to eject the following message at the time the request is initiated: APP

1. Use explain statement to view analysis resultssuch as explain select * from Test1 where id=1 appears: id selecttype table type possible_keys key Key_len ref rows extra columns. which Type=const said that through the index once found; Key=primary,

Mysqlslap is the official stress testing tool from the beginning of MySQL version 5.1.4. stress testing is performed by simulating multiple concurrent clients accessing MySQL concurrently, providing a detailed performance report of SQL execution

Given what has been done recently, it is necessary to solve the problem of slow SQL, now add a little bit of SQL statement performance analysis of the explain !Comprehensive return data situation, analysis of the parameters, you can understand the

The explain command is the first recommended command to address database performance, and most performance issues can be easily resolved with this command, explain can be used to see how SQL statements are executed, to help select better indexes

The Explian command can display the execution plan of the SELECT statementEach row in the result of explain corresponds to a table in the SELECT statement, and the order in the output is the order in which the tables are processed by the statement.