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NCHAR (Transact-SQL)

Retorna o caractere Unicode com o código inteiro especificado, como definido pelo padrão do Unicode.

Ícone de vínculo de tópicoConvenções de sintaxe Transact-SQL

Sintaxe

NCHAR ( integer_expression )

Argumentos

  • integer_expression
    É um número inteiro positivo de 0 até 65535. Se for especificado um valor fora deste intervalo, será retornado NULL.

Tipos de retorno

nchar(1)

Exemplos

A. Usando NCHAR e UNICODE

O exemplo a seguir usa as funções UNICODE e NCHAR para imprimir o valor UNICODE e o NCHAR (caractere Unicode) do segundo caractere da cadeia de caracteres København e para imprimir o segundo caractere real, ø.

DECLARE @nstring nchar(8)
SET @nstring = N'København'
SELECT UNICODE(SUBSTRING(@nstring, 2, 1)), 
   NCHAR(UNICODE(SUBSTRING(@nstring, 2, 1)))
GO

Conjunto de resultados.

----------- - 
248         ø(1 row(s) affected)

B. Usando SUBSTRING, UNICODE, CONVERT e NCHAR

O exemplo a seguir usa as funções SUBSTRING, UNICODE, CONVERT e NCHAR para imprimir o número do caractere, o caractere Unicode e o valor UNICODE de cada caractere na cadeia København.

-- 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. This 
-- 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 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)
   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

Conjunto de resultados.

Character # Unicode Character UNICODE Value
                                               
----------- ---- ----------------- ----------- 
1           K    K                 75

(1 row(s) affected)

                                               
----------- ---- ----------------- ----------- 
2           ø    ø                 248

(1 row(s) affected)

                                               
----------- ---- ----------------- ----------- 
3           b    b                 98

(1 row(s) affected)

                                               
----------- ---- ----------------- ----------- 
4           e    e                 101

(1 row(s) affected)

                                               
----------- ---- ----------------- ----------- 
5           n    n                 110

(1 row(s) affected)

                                               
----------- ---- ----------------- ----------- 
6           h    h                 104

(1 row(s) affected)

                                               
----------- ---- ----------------- ----------- 
7           a    a                 97

(1 row(s) affected)

                                               
----------- ---- ----------------- ----------- 
8           v    v                 118

(1 row(s) affected)

                                               
----------- ---- ----------------- ----------- 
9           n    n                 110

(1 row(s) affected)

                                               
----------- ---- ----------------- ----------- 
10          NULL                   NULL

(1 row(s) affected)

                                               
----------- ---- ----------------- ----------- 
11          NULL                   NULL

(1 row(s) affected)

                                               
----------- ---- ----------------- ----------- 
12          NULL                   NULL

(1 row(s) affected)

                                               
----------- ---- ----------------- ----------- 
13          NULL                   NULL

(1 row(s) affected)

                                               
----------- ---- ----------------- ----------- 
14          NULL                   NULL

(1 row(s) affected)

                                               
----------- ---- ----------------- ----------- 
15          NULL                   NULL

(1 row(s) affected)

                                               
----------- ---- ----------------- ----------- 
16          NULL                   NULL

(1 row(s) affected)

                                               
----------- ---- ----------------- ----------- 
17          NULL                   NULL

(1 row(s) affected)

                                               
----------- ---- ----------------- ----------- 
18          NULL                   NULL

(1 row(s) affected)