UNICODE (Transact-SQL)
依照 Unicode 標準所定義，傳回輸入運算式第一個字元的整數值。
語法
UNICODE ( 'ncharacter_expression' )
引數
'ncharacter_expression'
這是一個 nchar 或 nvarchar 運算式。
傳回類型
int
範例
A. 使用 UNICODE 和 NCHAR 函數
下列範例會利用 UNICODE 和 NCHAR 函數，來列印 Åkergatan 24 個字元字串第一個字元的 UNICODE 值，以及列印實際的第一個字元 ?。.
DECLARE @nstring nchar(12)
SET @nstring = N'Åkergatan 24'
SELECT UNICODE(@nstring), NCHAR(UNICODE(@nstring))
以下為結果集：
----------- -
197 Å
B. 使用 SUBSTRING、UNICODE 和 CONVERT
下列範例會利用 SUBSTRING、UNICODE 和 CONVERT 函數，來列印 Åkergatan 24 字串中的字元數目、Unicode 字元，以及每個字元的 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(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
以下為結果集：
Character # Unicode Character UNICODE Value
----------- ----------------- -----------
1 ? 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
請參閱
參考
資料類型 (Transact-SQL)
NCHAR (Transact-SQL)
字串函數 (Transact-SQL)