mysql query

Using return is more efficient than using global to pass an array, such as: function Userloginfo ($usertemp) { $detail =explode ("", $usertemp); return $detail; } $login =userloginfo ($USERDB); Than function Userloginfo ($usertemp) { Global $detail;

Looking for some information, and then I used the MySQL string processing of two functions concat () and left () 1, "CONCAT (str1,str2,...) Returns a string from the argument's link. Returns null if any argument is null. can have more than 2

Today for everyone to make PHP beginners Headache problem Summary, the following 14 questions to be helpful to PHP beginners. 1, cannot pass the variable between the page Get,post,session the automatic global variable is turned off in the latest

The previous section focuses on how to make a separate query perform faster. MySQL also allows you to change the precedence of statement scheduling, which enables queries from multiple clients to collaborate better so that a single client does not

No refresh function We use a lot of many, the following I will give you an example, is to achieve the php+ajax to achieve no refreshing scrolling load data, examples of very simple everyone as long as the process to operate on the OH. When we

Pagination Some notes: This class is not perfect, ask other experts to point out the deficiencies $this->offset () is not useless, it returns the pointer to MySQL query, if you are using MySQL queries, it is limit $offset//$offste = $this->offset (

Queries are the most commonly used operations in database technology. The query operation process is relatively simple, first from the client issued a query SQL statement, the database server after receiving the SQL statement sent by the client,

The MySQL query cache saves the full results of the query return. When the query hits the cache, the result is immediately returned, skipping the parsing, optimization, and execution phases. The query cache tracks each table involved in the query,

In the "Evaluation of IP address-> geographical transformation", the article mentions that using the IP2ADDR function to read IP database files directly is the most efficient, compared with the MySQL database storage of IP data, SQL query is the

Most of the Web sites currently using MySQL use Memcache as the key-value cache. Although such a structure is extremely popular, there are many successful cases, but too dependent on memcache, virtually let memcache become the root cause of failure:

mysql| page | Show recently, there are people in the forum who are asking how to implement the paging display of query results. I hope the following code will help you improve your program. The code is for MySQL, but it's easy to migrate to other

Because group by actually does the same sort operation, group by is mostly just a grouping operation after sorting. Of course, if other aggregate functions are used when grouping, then some aggregation function calculations are also required. As a

This article is mainly from the principles, manuals and source analysis in PHP query MySQL return a large number of results, memory footprint problem, while the use of the MySQL C API also involved.   Yesterday, some colleagues in the PHP discussion

Most server administrators know that the MySQL database management system (RDBMS) is a highly flexible software block with a wide range of startup options that can be used to modify related behavior. However, most people are not aware that standard

In this section, we will kill two birds a stone. Not only will we learn how to target object-oriented PHP and MySQL, but we will learn how to group objects. In this case, you will build a first-class usersgroup which will contain a series of user

Query string length in MySQL: Length: is a calculation of the lengths of a field a Chinese character is counted three characters, a number or letter is counted as a character The Char_length (str) return value is the length of the string str, and

This is Fotolog's experience, the legendary site more than Flickr, Fotolog deployed 51 memcached instances on 21 servers, a total of 254G cache space available, cache up to 175G of content, this number is much larger than the database of many sites,

This section describes a sample database that may be used in all parts of this book. This database gives you a reference example when learning to put MySQL into work. We mainly give examples from the two scenarios described above:Secretariat

Completely resolve Phpcms V9 upgrade, the article published: MySQL query:select * from ' withli_a '. ' V9_keyword ' WHERE ' keyword ' = ' roar ' and ' siteid ' = ' 1 ' limi T 1 MySQL Error:illegal mix of collations (latin1_swedish_ci,implicit) and (

The design of MySQL index can make your database fly, greatly improve the efficiency of the database. There are a few things to note when designing a MySQL index: 　1. Create an index Indexing is especially important for queries as a major