使用 SQL 查询选择特定会员资料属性的值

Question

尽管这应该是一个常见问题，但我在 Google 中并没有找到太多相关信息。 我正在使用 ASP.NET 成员资格，并将所有用户属性保存在 aspnet_Profile 表的 PropertyValuesString 字段中。

现在我想通过特定属性值搜索用户，但使用 SQL 查询。最好的性能明智的方法是什么？

Answer 1

asp_profile 的东西是这样一个字符串连接黑客工作，这非常困难。

但是你去吧。

http://www.karpach.com/Get-asp-net-profile-value-MS-SQL-database-using-T-SQL.htm

我将在此处粘贴代码以避免死链接问题。但也请查看链接，因为有些 cmets 值得一读。

ASP.Net profiles can store binary data as well, but usually your are interested in string data such as First and Last names. First lets create helper function, which helps to get position:length pair values:

CREATE FUNCTION dbo.fn_GetElement

(

@ord AS INT,

@str AS VARCHAR(8000),

@delim AS VARCHAR(1) )



RETURNS INT

AS

BEGIN

  -- If input is invalid, return null.

  IF @str IS NULL

      OR LEN(@str) = 0

      OR @ord IS NULL

      OR @ord < 1

      -- @ord > [is the] expression that calculates the number of elements.

      OR @ord > LEN(@str) - LEN(REPLACE(@str, @delim, '')) + 1

    RETURN NULL

  DECLARE @pos AS INT, @curord AS INT

  SELECT @pos = 1, @curord = 1

  -- Find next element's start position and increment index.

  WHILE @curord < @ord

    SELECT

      @pos    = CHARINDEX(@delim, @str, @pos) + 1,

      @curord = @curord + 1

  RETURN

  CAST(SUBSTRING(@str, @pos, CHARINDEX(@delim, @str + @delim, @pos) - @pos) AS INT)

END



And then code for the actual worker function:

CREATE FUNCTION dbo.fn_GetProfileElement

(

@fieldName AS NVARCHAR(100),

@fields AS NVARCHAR(4000),

@values AS NVARCHAR(4000))



RETURNS NVARCHAR(4000)

AS

BEGIN

  -- If input is invalid, return null.

  IF @fieldName IS NULL

      OR LEN(@fieldName) = 0

      OR @fields IS NULL

      OR LEN(@fields) = 0

      OR @values IS NULL

      OR LEN(@values) = 0



    RETURN NULL



-- locate FieldName in Fields

DECLARE @fieldNameToken AS NVARCHAR(20)

DECLARE @fieldNameStart AS INTEGER,

@valueStart AS INTEGER,

@valueLength AS INTEGER



-- Only handle string type fields (:S:)

SET @fieldNameStart = CHARINDEX(@fieldName + ':S',@Fields,0)



-- If field is not found, return null

IF @fieldNameStart = 0 RETURN NULL

SET @fieldNameStart = @fieldNameStart + LEN(@fieldName) + 3



-- Get the field token which I've defined as the start of the

-- field offset to the end of the length

SET @fieldNameToken = SUBSTRING(@Fields,@fieldNameStart,LEN(@Fields)-@fieldNameStart)



-- Get the values for the offset and length

SET @valueStart = dbo.fn_getelement(1,@fieldNameToken,':')

SET @valueLength = dbo.fn_getelement(2,@fieldNameToken,':')



-- Check for sane values, 0 length means the profile item was

-- stored, just no data

IF @valueLength = 0 RETURN ''



-- Return the string

RETURN SUBSTRING(@values, @valueStart+1, @valueLength)



END



Now we can get first name and last name as following:



SELECT dbo.fn_GetProfileElement('FirstName',PropertyNames,PropertyValuesString) + ' ' +



dbo.fn_GetProfileElement('LastName',PropertyNames,PropertyValuesString) as FullName FROM aspnet_Profile