SQL Server

Resolve Domain to IP Address

See more DNS Examples

Demonstrates how to perform a DNS query to obtain A records for resolving a domain name to an IPv4 address. SQL Server

-- 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)
    DECLARE @success int
    SELECT @success = 0

    DECLARE @dns int
    EXEC @hr = sp_OACreate 'Chilkat.Dns', @dns OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @json int
    EXEC @hr = sp_OACreate 'Chilkat.JsonObject', @json OUT

    EXEC sp_OASetProperty @json, 'EmitCompact', 0

    EXEC sp_OAMethod @dns, 'Query', @success OUT, 'A', 'microsoft.com', @json
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @dns, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @dns
        EXEC @hr = sp_OADestroy @json
        RETURN
      END

    EXEC sp_OAMethod @json, 'Emit', @sTmp0 OUT
    PRINT @sTmp0

    -- Sample response.
    -- Parsing code below..

    -- {
    --   "answer": {
    --     "a": [
    --       {
    --         "name": "microsoft.com",
    --         "ttl": 1528,
    --         "ipv4": "20.112.250.133"
    --       },
    --       {
    --         "name": "microsoft.com",
    --         "ttl": 1528,
    --         "ipv4": "20.231.239.246"
    --       },
    --       {
    --         "name": "microsoft.com",
    --         "ttl": 1528,
    --         "ipv4": "20.76.201.171"
    --       },
    --       {
    --         "name": "microsoft.com",
    --         "ttl": 1528,
    --         "ipv4": "20.70.246.20"
    --       },
    --       {
    --         "name": "microsoft.com",
    --         "ttl": 1528,
    --         "ipv4": "20.236.44.162"
    --       }
    --     ]
    --   }
    -- }

    -- Use this online tool to generate parsing code from sample JSON: 
    -- Generate Parsing Code from JSON

    DECLARE @name nvarchar(4000)

    DECLARE @ttl int

    DECLARE @ipv4 nvarchar(4000)

    DECLARE @i int
    SELECT @i = 0
    DECLARE @count_i int
    EXEC sp_OAMethod @json, 'SizeOfArray', @count_i OUT, 'answer.a'
    WHILE @i < @count_i
      BEGIN
        EXEC sp_OASetProperty @json, 'I', @i
        EXEC sp_OAMethod @json, 'StringOf', @name OUT, 'answer.a[i].name'
        EXEC sp_OAMethod @json, 'IntOf', @ttl OUT, 'answer.a[i].ttl'
        EXEC sp_OAMethod @json, 'StringOf', @ipv4 OUT, 'answer.a[i].ipv4'
        SELECT @i = @i + 1
      END

    EXEC @hr = sp_OADestroy @dns
    EXEC @hr = sp_OADestroy @json


END
GO