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Today's new start of the project in the database design, found that they are not familiar with the varchar type of MySQL, so the online collection of data collated as follows. Variations of the 1.varchar typeThe maximum length of the MySQL database's varchar type is limited to 255 in versions under 4.1, and its data range can be 0~255 or 1~255 (depending on the database of the different versions). In versions above MySQL5.0, the varchar data type is supported to 65535, which means that 65,532 by
to the next 2. How to detect uncommon characters in Python Introduction: Recently encountered a demand in the work, asked to detect whether the field contains uncommon characters and some illegal characters such as ~!@#$%^*. Through the online search data to solve, now will solve the process and sample code to share to everyone, there is a need to reference. Let's take a look below. 3. How to implement python detection of uncommon characters Introduction: Recently encountered a demand in the w
> The conversion of Chinese characters and multi-byte encodingConversion of Chinese characters to multibyte encoding-reply to "Don't know" problem Source of the problem: Tencoding.default code (in the 16-bit CE D2 C3 C7) How to turn into Chinese characters? Chinese characters are ' we '; --------------------------------------------------------------------------------Delphi 2009 The default encoding is multibyte encoding (MBCS), which Delphi represents it: Tencoding.default. Here is an example o
Test under MySQL 5.1.5-alpha to the conclusionLatin1:1character=1byte, 1 kanji =2character,In other words, a field is defined as varchar (200), it can store 100 characters or 200 letters.This should be noted, especially when the field content is composed of letters and Chinese characters, as far as possible to assume that the field content is composed of Chinese characters, set the field length accordinglyUTF8:1character=3bytes, 1
Tags: style blog http ar color OS using SP forReprint: Change of Http://www.cnblogs.com/doit8791/archive/2012/05/28/2522556.html1.varchar typeThe maximum length of the MySQL database's varchar type is limited to 255 in versions under 4.1, and its data range can be 0~255 or 1~255 (depending on the database of the different versions). In versions above MySQL5.0, the varchar data type is supported to 65535, which means that 65,532 bytes of data can be stored, and the starting and ending bits take u
The varchar type of the MySQL database is in versions below 4.1, nvarchar (characters that store Unicode data types), whether a character or a Chinese character, are stored as 2 bytes, which is generally used as input in Chinese or other languages, which is not easily garbled; varchar: The kanji is 2 bytes, the other character designators is 1 bytes, and varchar is suitable for inputting English and numerals.4.0 versions, varchar (20), refers to 20 by
easily garbled; varchar: The kanji is 2 bytes, the other character designators is 1 bytes, and varchar is suitable for inputting English and numerals.4.0 versions, varchar (20), refers to 20 bytes, if stored UTF8 kanji, can only save 6 (each Kanji 3 bytes), 5.0 version above, varchar (20), refers to 20 characters, regardless of the number of storage, Letters or
coding, and if you look carefully at the introduction of GBK coding, you will find a very interesting thing. GBK coded Chinese character areas include: A. GB 2312 Kanji area. namely GBK/2: B0a1-f7fe. Contains 6,763 GB of 2312 Kanji, arranged in the original order . B. GB 13000.1 expands the Chinese character area. Including: GBK/3:8140-a0fe. Contains 6,080 CJK
The analog keyboard input is implemented using the following 2 syntaxes.Sendkeys.send (string keys); Analog kanji (text) inputSendkeys.sendwait (string keys); Analog Key inputLet's take a look at the usage of the 2 syntax! Post the code later to see if you can read it.(1) Each key is represented by one or more characters. In order to specify a single keyboard character, you must press the key of the character itself. For example, to represent the lett
The local (win) test is normal kanji, but the server (CentOS) is stored in each kanji automatically converted into a similar 试 The format of the database is UTF8, the data is inserted before the $mysqli->set_charset ("UTF8"), the file is also UTF8 format, Google a lot of the solution is not found. Help. This issue has been closed due to: Reply content: The local (win) test is normal
specified ID document example idlist = ' 4,45,78,237 'limit= ' Start ID, number of records ' (starting ID starting from 0) indicates a limited range of records (e.g. limit= ' 1 "means starting with a record with ID of 2Keyword= ' A list of documents with the specified keywords, multiple keywords with ', ' pointsorderway= ' desc ' value is DESC or ASC, specifying whether the sort is descending or a forward sort, the default is descendingWorking with instances {dede:arclist flag= "C" channelid= "
2312, basically meet the needs of the computer processing of Chinese characters, it contains Chinese characters have covered 99.75% of the frequency of use in mainland China. For people's names, ancient Chinese and other aspects of the rarely used word, GB 2312 can not be processed, which led to the subsequent GBK and GB 18030 character set appearance. Chinese character Location Code: "Partition" of the received Chinese characters in GB 2312, with 94 k
The "allow_url_fopen" option in the PHP configuration is open, and you can use the URL as an include or require parameter.As well as Allow_url related parameters, you can refer to the php.ini in detail To convert an entire page This method is applicable to all coding environments. In this way, the character set of the first 128 characters (displayed characters) is represented by NCR (Numeric character reference, such as "Kanji", which is converted t
Convert php Kanji to phonetic codefunction UTF82GB ($UTFSTR) {//UTF-8 kanji to GBK kanjiif (function_exists (' Iconv ')) {return iconv (' Utf-8 ', ' GBK ', $utfstr);}Global $UC 2GBTABLE;$okstr = "";if (Trim ($utfstr) = = "") return $utfstr;if (Empty ($UC 2GBTABLE)) {$filename = DirName (__file__). "/gb2312-utf8.table";$fp = fopen ($filename, "R");while ($l = fgets ($fp, 15)){$UC 2gbtable[hexdec (substr ($l,
];//generate bit code for 2nd bitintR4;if(R3 = = 10) {R4= Random.nextint (15) + 1;//generate random numbers from 1 to 16}Else if(R3 = = 15) {R4= Random.nextint (15);//generate random numbers from 0 to 15}Else{R4= Random.nextint (16);//generate random numbers from 0 to 16}string STR_R4=RBASE[R4]; System.out.println (Str_r1+ STR_R2 + STR_R3 +STR_R4);//convert the built-in code to Chinese charactersbyte[] bytes =New byte[2];//saves the generated region code to the 1th element of a byte arrayString
a varchar,varchar2,nvarchar,nvarchar2All four types belong to the variable-length character type, and the difference between varchar and VARCHAR2 is two bytes for all characters in the latter, and the former only has two bytes for kanji and full-width characters, all of which are non-Unicode character data and can be defined with a maximum length of 4000 bytes. The difference between nvarchar and nvarchar2 is the same as above, which differs from the
'), (' T ',' he ',' 籜 '), (' W ',' 屲 ',' clamoring '), (' X ',' XI ',' 鑂 '), (' Y ',' ya ',' Wan Leng '), (' Z ',' as','n '); after execution, check to see if the data records in the added table have "? The question mark, if any, indicates a problem with the database encoding.2, query the database table in the first character phonetic AlphabetSELECT ' Pinyin '. py, ' corresponding table '. *From ' corresponding table ', ' Pinyin 'WHERE ' Ka
Label:1. Create a unique identity: CREATE TABLE zz (id uniqueidentifier,name nvarchar (10)); INSERT into ZZ (name) VALUES (' zmt '); Select NEWID () from ZZ; 2. Difference: NVARCHAR: variable string, length based on no space, Unicode encoding, length 4000, full kanji, definition of how long to insert VARCHAR: variable string, length based on not fill space, length 8000, half kanji, define how long to insert
following options: ? Shift JIS ? Japanese EUC ? JIS Kanji ? JIS Kanji (78) ? DEC Kanji ? NEC Kanji You should set the same code set on the remote computer. By default, the Telnet client uses raster fonts. Before you can use these code sets to access a remote computer, you must configure the Telnet client to use
The argument type of the CAST () function changes to return two different encodings for Chinese:SELECT CAST (' kanji ' as VARBINARY) as [GB2312];-Equivalent to cast (cast (N ' kanji ' as VARCHAR (4)) as VARBINARY)SELECT CAST (N ' kanji ' as VARBINARY) as [UTF-8];-Equivalent to cast (cast (N ' kanji ' as NVARCHAR (2)) a
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