DBA Challenge! I've spent 4 hours trying to figure how to extract data from XML in a hierarchical form.

Question

DBA Challenge! I've spent 4 hours trying to figure how to extract data from XML in a hierarchical form.

mrdba128

SSC Rookie

Points: 48
More actions
May 16, 2017 at 11:48 am

#402065

I've searched the web to no avail. So PLEASE help out!
I have a table:
CREATE TABLE [Course].[Navigation](
    [NavigationId] [int] IDENTITY(1,1) NOT NULL,
    ParentID int,
    ChildID int,
    [Type] [varchar](100) NULL,
    [Label] [int] NULL,
    [Id] [varchar](100) NULL )
Which represents a navigational chart for a course.
The XML that I'm trying to load is:
'<navigation>
        <content label="Introduction">
            <content label="Intro" id="000286_1001"/>
        </content>
        <content label="Premature Atrial Contractions">
            <content label="Description" id="000286_1002"/>
            <content label="ECG Features" id="000286_1003"/>
            <content label="Etiology/Symptoms/Treatment" id="000286_1004"/>
        </content>
        <content label="Wandering">
            <content label="Description" id="000286_1005"/>
            <content label="ECG Features" id="000286_1006"/>
            <content label="Etiology/Symptoms/Treatment" id="000286_1007"/>
        </content>
        <content label="Ectopic Atrial Rhythm">
            <content label="Description" id="000286_1008"/>
            <content label="ECG Features" id="000286_1009"/>
            <content label="Etiology/Symptoms/Treatment" id="000286_1010"/>
        </content>
        <content label="Supraventricular Tachycardia">
            <content label="SVT" id="000286_1011"/>
            <content label="Etiology/Symptoms/Treatment" id="000286_1012"/>
            <content label="Multifocal Atrial Tachycardia">
                <content label="Description" id="000286_1013"/>
                <content label="ECG Features" id="000286_1014"/>
                <content label="Etiology/Symptoms/Treatment" id="000286_1015"/>
            </content>
            <content label="Ectopic Atrial Tachycardia">
                <content label="Description" id="000286_1016"/>
                <content label="ECG Features" id="000286_1017"/>
                <content label="Etiology/Symptoms/Treatment" id="000286_1018"/>
            </content>
            <content label="Ectopic Atrial Tachycardia with Block">
                <content label="Description" id="000286_1019"/>
            </content>
            <content label="Atrial Flutter">
                <content label="Description" id="000286_1020"/>
                <content label="ECG Features" id="000286_1021"/>
                <content label="Etiology/Symptoms/Treatment" id="000286_1022"/>
                <content label="Treatment" id="000286_1023"/>
            </content>
            <content label="Atrial Fibrillation">
                <content label="Description" id="000286_1024"/>
                <content label="ECG Features" id="000286_1025"/>
                <content label="Etiology/Symptoms/Treatment" id="000286_1026"/>
                <content label="Signs" id="000286_1027"/>
                <content label="Treatment" id="000286_1028"/>
            </content>
            <content label="AVRT">
                <content label="Description" id="000286_1029"/>
                <content label="Pathophysiology" id="000286_1030"/>
                <content label="ECG Features" id="000286_1031"/>
                <content label="Etiology" id="000286_1032"/>
            </content>
            <content label="AVNRT">
                <content label="Description" id="000286_1033"/>
                <content label="ECG Features" id="000286_1034"/>
                <content label="Etiology" id="000286_1035"/>
            </content>
            <content label="Treatment" id="000286_1036"/>
        </content>
        <content label="Review">
            <content label="Quick Quiz" id="000286_1037"/>
        </content>
        <content label="Conclusion">
            <content label="Summary" id="000286_1038"/>
        </content>
    </navigation> '

Viewing 5 posts - 1 through 4 (of 4 total)

You must be logged in to reply to this topic. Login to reply

Matt Miller (4) SSC Guru Points: 124210 More actions · Answer 1

Patrick - just to be extra clear - can you model up/dummy up what it is you're expecting to get back? Are you essentially trying to just return XML snippets as XML based on the bigger document?

----------------------------------------------------------------------------------
Your lack of planning does not constitute an emergency on my part...unless you're my manager...or a director and above...or a really loud-spoken end-user..All right - what was my emergency again?

DesNorton SSC-Insane Points: 24276 More actions · Answer 2

I cannot identify what you are looking for, but perhaps this will start you off along the right track.

DECLARE @data XML = N'<navigation> <content label="Introduction"> <content label="Intro" id="000286_1001"/> </content> <content label="Premature Atrial Contractions"> <content label="Description" id="000286_1002"/> <content label="ECG Features" id="000286_1003"/> <content label="Etiology/Symptoms/Treatment" id="000286_1004"/> </content> <content label="Wandering"> <content label="Description" id="000286_1005"/> <content label="ECG Features" id="000286_1006"/> <content label="Etiology/Symptoms/Treatment" id="000286_1007"/> </content> <content label="Ectopic Atrial Rhythm"> <content label="Description" id="000286_1008"/> <content label="ECG Features" id="000286_1009"/> <content label="Etiology/Symptoms/Treatment" id="000286_1010"/> <content label="Supraventricular Tachycardia"> <content label="SVT" id="000286_1011"/> <content label="Etiology/Symptoms/Treatment" id="000286_1012"/> </content> <content label="Multifocal Atrial Tachycardia"> <content label="Description" id="000286_1013"/> <content label="ECG Features" id="000286_1014"/> <content label="Etiology/Symptoms/Treatment" id="000286_1015"/> </content> <content label="Ectopic Atrial Tachycardia"> <content label="Description" id="000286_1016"/> <content label="ECG Features" id="000286_1017"/> <content label="Etiology/Symptoms/Treatment" id="000286_1018"/> </content> <content label="Ectopic Atrial Tachycardia with Block"> <content label="Description" id="000286_1019"/> </content> <content label="Atrial Flutter"> <content label="Description" id="000286_1020"/> <content label="ECG Features" id="000286_1021"/> <content label="Etiology/Symptoms/Treatment" id="000286_1022"/> <content label="Treatment" id="000286_1023"/> </content> <content label="Atrial Fibrillation"> <content label="Description" id="000286_1024"/> <content label="ECG Features" id="000286_1025"/> <content label="Etiology/Symptoms/Treatment" id="000286_1026"/> <content label="Signs" id="000286_1027"/> <content label="Treatment" id="000286_1028"/> </content> <content label="AVRT"> <content label="Description" id="000286_1029"/> <content label="Pathophysiology" id="000286_1030"/> <content label="ECG Features" id="000286_1031"/> <content label="Etiology" id="000286_1032"/> </content> <content label="AVNRT"> <content label="Description" id="000286_1033"/> <content label="ECG Features" id="000286_1034"/> <content label="Etiology" id="000286_1035"/> </content> <content label="Treatment" id="000286_1036"/> </content> <content label="Review"> <content label="Quick Quiz" id="000286_1037"/> </content> <content label="Conclusion"> <content label="Summary" id="000286_1038"/> </content> </navigation> ';

SELECT NavigationId = ROW_NUMBER() OVER (ORDER BY ISNULL(C.c.value('@id', 'VARCHAR(50)'), '999999_999') , ISNULL(G.r.value('@id', 'VARCHAR(50)'), '999999_999')) , [Type] = T.l.value('@label', 'VARCHAR(100)') , Parent_label = C.c.value('@label', 'VARCHAR(100)') , Parent_id = C.c.value('@id', 'VARCHAR(50)') , Child_label = G.r.value('@label', 'VARCHAR(100)') , Child_id = G.r.value('@id', 'VARCHAR(50)') FROM @data.nodes('navigation/content') AS T(l) CROSS APPLY T.l.nodes('content') AS C(c) OUTER APPLY C.c.nodes('content') AS G(r);

How to post data/code on a forum to get the best help.

Thom A SSC Guru Points: 99126 More actions · Answer 3

This might get you started, but without knowing your end game, I have no idea what to aim for:
SELECT X.N.value('@label','nvarchar(50)') AS [Type], C.T.value('@label','nvarchar(50)') AS Label, C.T.value('@id','nvarchar(50)') AS id FROM @XML.nodes('/navigation/content') X(N) CROSS APPLY X.N.nodes('./content') C(T);

Edit: Des was way ahead of me while I had to (once again) Google how to use XQuery 😛

Thom~

Excuse my typos and sometimes awful grammar. My fingers work faster than my brain does.
Larnu.uk

Jeff Moden SSC Guru Points: 1003853 More actions · Answer 4

With no reflection on the OP because he's the poor consumer of this data and not the perpetrator... you just have to wonder what the heck is on people's minds when they build such XML. It's certainly meant to be hierarchical but they used the XML like a typewriter instead of using the abilities of XML. A simple numbered list TSV would have been more effective in just about every manner.

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)