(SQL Server) URL Encoding and Decoding

Demonstrates URL encoding and decoding.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    -- To URL encoding a string:
    DECLARE @s nvarchar(4000)
    SELECT @s = 'Why a > b?'

    DECLARE @sb int
    -- Use "Chilkat_9_5_0.StringBuilder" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sb OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @success int
    EXEC sp_OAMethod @sb, 'Append', @success OUT, @s

    -- URL encode the string.
    EXEC sp_OAMethod @sb, 'Encode', @success OUT, 'url', 'utf-8'

    -- Show the URL encoded string:
    DECLARE @sEncoded nvarchar(4000)
    EXEC sp_OAMethod @sb, 'GetAsString', @sEncoded OUT

    PRINT @sEncoded

    -- The result is:  Why%20a%20%3E%20b%3F

    -- If you prefer "+" instead of "%20" for SPACE chars:
    DECLARE @numReplaced int
    EXEC sp_OAMethod @sb, 'Replace', @numReplaced OUT, '%20', '+'
    EXEC sp_OAMethod @sb, 'GetAsString', @sTmp0 OUT
    PRINT @sTmp0

    -- Output is:   Why+a+%3E+b%3F

    -- To decode:
    EXEC sp_OAMethod @sb, 'Decode', @success OUT, 'url', 'utf-8'
    EXEC sp_OAMethod @sb, 'GetAsString', @sTmp0 OUT
    PRINT @sTmp0

    -- Result is: Why a > b?

    EXEC @hr = sp_OADestroy @sb


END
GO