How to parse multiple xml node to sql server

Question

actually i want to parse xml to sql using following xml node i want xml input parameter then got in Table.

<root>
 <Header>
<RqID>20220210125441</RqID>
</Header>
<Item>
<element>
<FromCrcy>JPY</FromCrcy>
<Rate>0.00886</Rate>
<RatioFrom>0</RatioFrom>
<RatioTo>0</RatioTo>
<ToCrcy>EUR</ToCrcy>
<ValidFrom>26.07.2010</ValidFrom>
</element>      
</Item>
<ResponseStatus>
<StatusCode>I000000</StatusCode>
<StatusDesc>Success</StatusDesc>
</ResponseStatus>
</root>

following script i am using to get xml to table in sql server but getting as null so please solve it.

Set @StrMessage = ''
    Declare @intPointer int

    Exec sp_xml_preparedocument @intPointer  OUTPUT, @MessageXML
    --PRINT CONVERT(NVARCHAR(MAX),@MessageXML)

    Create Table #Currency_bas 
    (
        RowID int Identity, RqID nvarchar(50), FromCrcy nvarchar(3), Rate Decimal(13,3), RatioFrom int, RatioTo int
        , ToCrcy nvarchar(3), ValidFrom date,StatusCode nvarchar(50),StatusDesc nvarchar(50)
    )   
    Insert Into #Currency_bas
    (
         --RqID,
         --StatusCode,StatusDesc --, --
         FromCrcy, Rate, RatioFrom, RatioTo 
        , ToCrcy, ValidFrom 
    )

    Select  
    --RqID,StatusCode,StatusDesc --, 
    FromCrcy, Rate, RatioFrom, RatioTo 
        ,ToCrcy, ValidFrom  
    From OPENXML(@intPointer, '/root',2)
    WITH 
    (
       --RqID nvarchar(50),
       --StatusCode nvarchar(50),
       --StatusDesc nvarchar(50)
        FromCrcy nvarchar(3), 
        Rate Decimal(13,3), 
        RatioFrom int, 
        RatioTo int, 
        ToCrcy nvarchar(3), 
        ValidFrom   date
    )


    SELECT FromCrcy, Rate, RatioFrom, RatioTo 
        ,ToCrcy, ValidFrom FROM #Currency_bas

how to parse this xml in sql table so please give me example to solve this.

Answer 1

If you inspect your data you'll see it doesn't start at root it starts at root/Item/element

Also note the extra date conversion step.

An example of the syntax you need to get RqID and Status is here

https://learn.microsoft.com/en-us/sql/t-sql/functions/openxml-transact-sql?view=sql-server-ver15#b-specifying-colpattern-for-mapping-between-columns-and-the-xml-attributes

DECLARE @MessageXML VARCHAR(8000)

SET @MessageXML = '
<root>
 <Header><RqID>20220210125441</RqID></Header>
 <Item>
    <element>
        <FromCrcy>JPY</FromCrcy>
        <Rate>0.00886</Rate>
        <RatioFrom>0</RatioFrom>
        <RatioTo>0</RatioTo>
        <ToCrcy>EUR</ToCrcy>
        <ValidFrom>26.07.2010</ValidFrom>
    </element>      
 </Item>
 <ResponseStatus>
        <StatusCode>I000000</StatusCode>
        <StatusDesc>Success</StatusDesc>
 </ResponseStatus>
</root>
'

Declare @intPointer int

    Exec sp_xml_preparedocument @intPointer  OUTPUT, @MessageXML

    Select  
    RqID,
    StatusCode,StatusDesc, 
    FromCrcy, Rate, RatioFrom, RatioTo 
        ,ToCrcy, CONVERT(DATE,ValidFrom,104) as ValidFrom
    From OPENXML(@intPointer, '/root/Item/element',2)
    WITH 
    (
       RqID nvarchar(50) '../../Header/RqID',
       StatusCode nvarchar(50) '../../ResponseStatus/StatusCode',
       StatusDesc nvarchar(50) '../../ResponseStatus/StatusDesc',
        FromCrcy nvarchar(3), 
        Rate Decimal(13,3), 
        RatioFrom int, 
        RatioTo int, 
        ToCrcy nvarchar(3), 
        ValidFrom   varchar(100)
    )

Answer 2

Microsoft proprietary OPENXML and its companions sp_xml_preparedocument and sp_xml_removedocument are kept just for backward compatibility with the obsolete SQL Server 2000. Their use is diminished just to very few fringe cases.

Also, folks are usually forget to call the sp_xml_removedocument . And it is causing a memory leak.

Starting from SQL Server 2005 onwards, it is strongly recommended to re-write your SQL and switch it to XQuery.

SQL

DECLARE @MessageXML XML = 
N'<root>
    <Header>
        <RqID>20220210125441</RqID>
    </Header>
    <Item>
        <element>
            <FromCrcy>JPY</FromCrcy>
            <Rate>0.00886</Rate>
            <RatioFrom>0</RatioFrom>
            <RatioTo>0</RatioTo>
            <ToCrcy>EUR</ToCrcy>
            <ValidFrom>26.07.2010</ValidFrom>
        </element>
    </Item>
    <ResponseStatus>
        <StatusCode>I000000</StatusCode>
        <StatusDesc>Success</StatusDesc>
    </ResponseStatus>
</root>';

SELECT RqID = @MessageXML.value('(/root/Header/RqID/text())[1]', 'VARCHAR(50)')
    , StatusCode = @MessageXML.value('(/root/ResponseStatus/StatusCode/text())[1]', 'VARCHAR(50)')
    , StatusDesc = @MessageXML.value('(/root/ResponseStatus/StatusDesc/text())[1]', 'VARCHAR(50)')
    , FromCrcy = c.value('(FromCrcy/text())[1]', 'CHAR(3)')
    , Rate = c.value('(Rate/text())[1]', 'DECIMAL(13,5)')
    , RatioFrom = c.value('(RatioFrom/text())[1]', 'INT')
    , RatioTo = c.value('(RatioTo/text())[1]', 'INT')
    , ToCrcy = c.value('(ToCrcy/text())[1]', 'CHAR(3)')
    , ValidFrom = TRY_CONVERT(DATE, c.value('(ValidFrom/text())[1]', 'VARCHAR(10)'), 104)
FROM @MessageXML.nodes('/root/Item/element') AS t(c);

Output

+----------------+------------+------------+----------+---------+-----------+---------+--------+------------+
|      RqID      | StatusCode | StatusDesc | FromCrcy |  Rate   | RatioFrom | RatioTo | ToCrcy | ValidFrom  |
+----------------+------------+------------+----------+---------+-----------+---------+--------+------------+
| 20220210125441 | I000000    | Success    | JPY      | 0.00886 |         0 |       0 | EUR    | 2010-07-26 |
+----------------+------------+------------+----------+---------+-----------+---------+--------+------------+