语法 UNICODE ( 'ncharacter_expression' )参数 'ncharacter_expression'是 nchar 或 nvarchar 表达式。 返回类型 int示例 A. 使用 UNICODE 和 NCHAR 下面的示例使用 UNICODE 和 NCHAR 函数打印 Åkergatan 24 字符串中第一个字符的 UNICODE 值,并打印实际的第一个字符 Å。DECLARE @nstring nchar(12) SET @nstring = N'Åkergatan 24' SELECT UNICODE(@nstring), NCHAR(UNICODE(@nstring))下面是结果集:----------- - 197 Å B. 使用 SUBSTRING、UNICODE 和 CONVERT 函数 下面的示例使用 SUBSTRING、UNICODE 和 CONVERT 函数输出字符串 Åkergatan 24 中每个字符的字符号、Unicode 字符和 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(12) -- 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'Åkergatan 24' -- Print the character number of the position of the string you are at, -- the actual Unicode character you are processing, and the UNICODE -- value for this particular character. PRINT 'Character #' + ' ' + 'Unicode Character' + ' ' + 'UNICODE Value' WHILE @position <= DATALENGTH(@nstring) -- While these are still characters in the character string, BEGIN SELECT @position, CONVERT(char(17), SUBSTRING(@nstring, @position, 1)), UNICODE(SUBSTRING(@nstring, @position, 1)) SELECT @position = @position + 1 END下面是结果集:Character # Unicode Character UNICODE Value
----------- ----------------- ----------- 1 Å 197
----------- ----------------- ----------- 2 k 107
----------- ----------------- ----------- 3 e 101
----------- ----------------- ----------- 4 r 114
----------- ----------------- ----------- 5 g 103
----------- ----------------- ----------- 6 a 97
----------- ----------------- ----------- 7 t 116
----------- ----------------- ----------- 8 a 97
----------- ----------------- ----------- 9 n 110
----------- ----------------- ----------- 10 32
----------- ----------------- ----------- 11 2 50
----------- ----------------- ----------- 12 4 52
是不是在SQL Server 2005中也应该可以用中文来做标识符?-------------可以用中文做字段,变量.不过不建议这么做.
UNICODE ( 'ncharacter_expression' )参数
'ncharacter_expression'是 nchar 或 nvarchar 表达式。 返回类型
int示例
A. 使用 UNICODE 和 NCHAR
下面的示例使用 UNICODE 和 NCHAR 函数打印 Åkergatan 24 字符串中第一个字符的 UNICODE 值,并打印实际的第一个字符 Å。DECLARE @nstring nchar(12)
SET @nstring = N'Åkergatan 24'
SELECT UNICODE(@nstring), NCHAR(UNICODE(@nstring))下面是结果集:----------- -
197 Å
B. 使用 SUBSTRING、UNICODE 和 CONVERT 函数
下面的示例使用 SUBSTRING、UNICODE 和 CONVERT 函数输出字符串 Åkergatan 24 中每个字符的字符号、Unicode 字符和 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(12)
-- 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'Åkergatan 24'
-- Print the character number of the position of the string you are at,
-- the actual Unicode character you are processing, and the UNICODE
-- value for this particular character.
PRINT 'Character #' + ' ' + 'Unicode Character' + ' ' + 'UNICODE Value'
WHILE @position <= DATALENGTH(@nstring)
-- While these are still characters in the character string,
BEGIN
SELECT @position,
CONVERT(char(17), SUBSTRING(@nstring, @position, 1)),
UNICODE(SUBSTRING(@nstring, @position, 1))
SELECT @position = @position + 1
END下面是结果集:Character # Unicode Character UNICODE Value
----------- ----------------- -----------
1 Å 197
----------- ----------------- -----------
2 k 107
----------- ----------------- -----------
3 e 101
----------- ----------------- -----------
4 r 114
----------- ----------------- -----------
5 g 103
----------- ----------------- -----------
6 a 97
----------- ----------------- -----------
7 t 116
----------- ----------------- -----------
8 a 97
----------- ----------------- -----------
9 n 110
----------- ----------------- -----------
10 32
----------- ----------------- -----------
11 2 50
----------- ----------------- -----------
12 4 52