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Simple encryption/decryption method packaging, including Encode (), decode (), MD5 ()Publication date: 2004-07-30 author: [Reprint] Source: Package Steeven; /*Purpose: Simple encryption/decryption method packagingAuthor: steeven@kali.com.cnDate: 12/

Update MySQL user set Password=password (' 1234 ') where user= ' Ming 'Delete from MySQL user where user= ' and host= 'Ipconfig/allPing 127.0.0.1If not existsThe CREATE table if not EXISTS table name (field name fields type)Engine=innodb DEFAULT

One: Mathematical functionsSELECT Greatest (2,3,4), Greatest (1.1,3.2);SELECT LEAST (2,3,4), LEAST (1.1,3.2);Floor (X)Returns the maximum integer value that is not greater than X.Mysql> SELECT Floor (1.23);1Mysql> SELECT Floor (-1.23);-2LOG10

Php object-oriented content 1. What is object-oriented? Object-Oriented Programming (Object Oriented Programming, OOP, Object-Oriented Programming) is a computer Programming architecture, one basic principle of OOP is that a computer program is

This article describes how to use pack to process binary files in php. For more information, see This article describes how to use pack to process binary files in php. For more information, see The pack and unpack functions can be used to

MySQL automatically converts numbers to strings, and vice versa. MysqlSELECT1 + 1; MySQL automatically converts numbers to strings, and vice versa. Mysql SELECT 1 + '1';-2 mysql select concat (2, 'test');-'2 test' If You Want To explicitly convert

In mysql, how to update a field value to its own value connected to a string CONCAT (str1, str2,...) returns the string produced by the connection parameter. If any parameter is NULL, the return value is NULL. There may be one or more parameters. If

The MYSQL Cast function is a very important MYSQL function. The following describes the syntax and usage of the MYSQL Cast function in detail, hoping that you can have a better understanding of the MYSQL Cast function. BINARYThe BINARY operator

The following articles mainly introduce the specific operation scheme of MySQL string connection functions. We will take the concat function in MySQL database as an example to describe in detail, the following describes the specific operations of

This article mainly introduces php Data type conversion. if you need it, you can refer to the explicit type definition that PHP does not need (or does not support) in variable definition; the variable type is determined by the context in which the

Sometimes you need to transfer an object on the network, in order to facilitate the transfer, the whole object can be converted into a binary string, and then to the other end, and then revert to the original object, this process is called

First, let's take a look at mysql's CONCAT (str1, str2,…) function ,...)Returns the string generated by the connection parameter. If any parameter is NULL, the return value is NULL. There may be one or more parameters. If all parameters are

() function to get the length of a string:Select Length (' ABCDEFG '), Length (' 0123456789 ');/*+-------------------+----------------------+| Length (' ABCDEFG ') | Length (' 0123456789 ') |+-------------------+----------------------+|              

From: Http://hi.baidu.com/zhy65991/blog/item/0a663172b039321a8601b0e4.html Usually, the encryption algorithm used is relatively simple and efficient, the key is short, encryption and decryption speed, deciphering extremely difficult. This paper

1. About multi-table queriesI understand: Since MySQL multi-table query when the connection between the table is a Cartesian product, so as little as possible to use a multi-table query, if used to use nested statementsExample: Description: '

From the database to take n fields, and then combined together with the "," split display, at first thought with CONCAT () to deal with, good is the trouble, did not expect in the manual actually mentioned Concat_ws (), very useful.

MySQL CONCAT (str1,str2,...)Returns the string that results from the connection parameter. If any one of the arguments is NULL, the return value is null. There may be one or more parameters. If all parameters are non-binary strings, the result is a

Welcome to the Linux community forum and interact with 2 million technical staff. MySQL strings are classified into two categories: 1) binary strings: a string of bytes. The interpretation of bytes does not involve character sets, therefore, it does

This article will introduce in detail the usage of mysql string functions CONCAT_WS and CONCAT (). If you need to know the usage and difference of these two functions, you can refer. CONCAT (str1, str2 ,...) MethodCONCAT (str1, str2

Recently in the C + + socket and the Java Socket Communication program, involving the transmission of integer floating point number, need to restore data from a byte array, check some information, summarized as follows1. Machine representations of