NCHAR 根据 Unicode 标准所进行的定义,用给定整数代码返回 Unicode 字符。语法 NCHAR ( integer_expression ) 参数 integer_expression介于 0 与 65535 之间的所有正整数。如果指定了超出此范围的值,将返回 NULL。返回类型 nchar(1)示例 A. 使用 NCHAR 和 UNICODE 下面的示例使用 UNICODE 和 NCHAR 函数打印字符串 Køenhavn 第二个字符的 UNICODE 值和 NCHAR(Unicode 字符),并打印实际的第二个字符ø。DECLARE @nstring nchar(8) SET @nstring = N'København' SELECT UNICODE(SUBSTRING(@nstring, 2, 1)), NCHAR(UNICODE(SUBSTRING(@nstring, 2, 1))) GO下面是结果集:----------- - 248 ø(1 row(s) affected)B. 使用 SUBSTRING、UNICODE、CONVERT 和 NCHAR 下面的示例使用 SUBSTRING、UNICODE、CONVERT 和 NCHAR 函数打印字符串 Køenhavn 的字符数、Unicode 字符以及每个字符的 UNICODE 值。-- The @position variable holds the position of the character currently -- being processed. The @nstring variable is the Unicode character -- string to process. DECLARE @position int, @nstring nchar(9) -- Initialize the current position variable to the first character in -- the string. SET @position = 1 -- Initialize the character string variable to the string to process. -- Notice that there is an N before the start of the string, which -- indicates that the data following the N is Unicode data. SET @nstring = N'København' -- Print the character number of the position of the string you're at, -- the actual Unicode character you're processing, and the UNICODE value -- for this particular character. PRINT 'Character #' + ' ' + 'Unicode Character' + ' ' + 'UNICODE Value' WHILE @position <= DATALENGTH(@nstring) BEGIN SELECT @position, NCHAR(UNICODE(SUBSTRING(@nstring, @position, 1))), CONVERT(NCHAR(17), SUBSTRING(@nstring, @position, 1)), UNICODE(SUBSTRING(@nstring, @position, 1)) SELECT @position = @position + 1 END GO下面是结果集:Character # Unicode Character UNICODE Value
根据 Unicode 标准所进行的定义,用给定整数代码返回 Unicode 字符。语法
NCHAR ( integer_expression ) 参数
integer_expression介于 0 与 65535 之间的所有正整数。如果指定了超出此范围的值,将返回 NULL。返回类型
nchar(1)示例
A. 使用 NCHAR 和 UNICODE
下面的示例使用 UNICODE 和 NCHAR 函数打印字符串 Køenhavn 第二个字符的 UNICODE 值和 NCHAR(Unicode 字符),并打印实际的第二个字符ø。DECLARE @nstring nchar(8)
SET @nstring = N'København'
SELECT UNICODE(SUBSTRING(@nstring, 2, 1)),
NCHAR(UNICODE(SUBSTRING(@nstring, 2, 1)))
GO下面是结果集:----------- -
248 ø(1 row(s) affected)B. 使用 SUBSTRING、UNICODE、CONVERT 和 NCHAR
下面的示例使用 SUBSTRING、UNICODE、CONVERT 和 NCHAR 函数打印字符串 Køenhavn 的字符数、Unicode 字符以及每个字符的 UNICODE 值。-- The @position variable holds the position of the character currently
-- being processed. The @nstring variable is the Unicode character
-- string to process.
DECLARE @position int, @nstring nchar(9)
-- Initialize the current position variable to the first character in
-- the string.
SET @position = 1
-- Initialize the character string variable to the string to process.
-- Notice that there is an N before the start of the string, which
-- indicates that the data following the N is Unicode data.
SET @nstring = N'København'
-- Print the character number of the position of the string you're at,
-- the actual Unicode character you're processing, and the UNICODE value -- for this particular character.
PRINT 'Character #' + ' ' + 'Unicode Character' + ' ' + 'UNICODE Value'
WHILE @position <= DATALENGTH(@nstring)
BEGIN
SELECT @position,
NCHAR(UNICODE(SUBSTRING(@nstring, @position, 1))),
CONVERT(NCHAR(17), SUBSTRING(@nstring, @position, 1)),
UNICODE(SUBSTRING(@nstring, @position, 1))
SELECT @position = @position + 1
END
GO下面是结果集:Character # Unicode Character UNICODE Value
----------- ----------------- -----------
1 K 75
----------- ----------------- -----------
2 ø 248
----------- ----------------- -----------
3 b 98
----------- ----------------- -----------
4 e 101
----------- ----------------- -----------
5 n 110
----------- ----------------- -----------
6 h 104
----------- ----------------- -----------
7 a 97
----------- ----------------- -----------
8 v 118
----------- ----------------- -----------
9 n 110
----------- ----------------- -----------
10 (null) (null)
----------- ----------------- -----------
11 (null) (null)
----------- ----------------- -----------
12 (null) (null)
----------- ----------------- -----------
13 (null) (null)
----------- ----------------- -----------
14 (null) (null)
----------- ----------------- -----------
15 (null) (null)
----------- ----------------- -----------
16 (null) (null)
----------- ----------------- -----------
17 (null) (null)
----------- ----------------- -----------
18 (null) (null)
请参见数据类型字符串函数UNICODE©1988-2000 Microsoft Corporation。保留所有权利。