XML Data into Row Selection - sql

Question

I have a single field in a DB which contains columns of data, but in an continuous string of XML.
I want to extract the data from the XML, and return as normal columns.
There could be multiple rows of data within this single field.
Here are 2 real examples of data in this field
Example 1:
<DocumentElement>
<AuditTrailDetail>
<TableName>order_header_total</TableName>
<RowID>837</RowID>
<AuditType>Edit</AuditType>
<FieldName>oht_foreign_net</FieldName>
<ValueFrom>65.1600</ValueFrom>
<ValueTo>115.1600</ValueTo>
<EntityName />
<DisplayName />
<Identifier />
</AuditTrailDetail>
<AuditTrailDetail>
<TableName>order_line_item</TableName>
<RowID>2442</RowID>
<AuditType>Edit</AuditType>
<FieldName>oli_qty_required</FieldName>
<ValueFrom>1.0000</ValueFrom>
<ValueTo>2.0000</ValueTo>
<EntityName />
<DisplayName />
<Identifier>61 - test</Identifier>
</AuditTrailDetail>
</DocumentElement>
Example 2:
<DocumentElement>
<AuditTrailDetail>
<TableName>order_line_item</TableName>
<RowID>2446</RowID>
<AuditType>Edit</AuditType>
<FieldName>oli_description</FieldName>
<ValueFrom>2 Ply Tissue Masks</ValueFrom>
<ValueTo>2 Ply Tissue Masksdd</ValueTo>
<EntityName />
<DisplayName />
<Identifier>D/D170 - 2 Ply Tissue Masksdd</Identifier>
</AuditTrailDetail>
</DocumentElement>
For Example 1, I'd like to return 2 rows as below:
For Example 2 there is one row, and I'd like it as below:
The fields in the table are:
owat_id
owat_audit_type
owat_record_id
owat_record_type
owat_datetime
owat_ud_id
owat_details
The XML data is within owat_details.
Assume the table name is Audit_Trail.
How can I do this directly in the SQL query?

Answer 1

Thank you to Johnie Karr
I have got this working using XQuery.
I have to do 2 queries and union them together to get the 2 separate elements in one field as separate rows. I'm sure there is a cleaner solution, but this works.
Thank you very much :)
SELECT
AuditTrail.owat_record_type,
AuditTrail.owat_audit_type,
AuditTrail.owat_datetime as 'Audit Date',
user_detail.ud_username as 'User',
AuditTrail.owat_details.value('(/DocumentElement/AuditTrailDetail/TableName)[1]','varchar(50)') AS TableName,
AuditTrail.owat_details.value('(/DocumentElement/AuditTrailDetail/RowID)[1]','varchar(50)') AS RowID,
AuditTrail.owat_details.value('(/DocumentElement/AuditTrailDetail/FieldName)[1]','varchar(50)') AS FieldName,
AuditTrail.owat_details.value('(/DocumentElement/AuditTrailDetail/ValueFrom)[1]','varchar(50)') AS ValueFrom,
AuditTrail.owat_details.value('(/DocumentElement/AuditTrailDetail/ValueTo)[1]','varchar(50)') AS ValueTo,
AuditTrail.owat_details.value('(/DocumentElement/AuditTrailDetail/Identifier)[1]','varchar(50)') AS Identifier
FROM
(select
orderwise_audit_trail.owat_id,
orderwise_audit_trail.owat_audit_type,
orderwise_audit_trail.owat_record_id,
orderwise_audit_trail.owat_record_type,
orderwise_audit_trail.owat_datetime,
orderwise_audit_trail.owat_ud_id,
convert(xml, orderwise_audit_trail.owat_details) as owat_details
from
orderwise_audit_trail) as AuditTrail
left join user_detail on user_detail.ud_id = AuditTrail.owat_ud_id
Where AuditTrail.owat_details is not NULL
and (AuditTrail.owat_details.value('(/DocumentElement/AuditTrailDetail/TableName)[1]','varchar(50)')) is not null
UNION ALL
SELECT
AuditTrail.owat_record_type,
AuditTrail.owat_audit_type,
AuditTrail.owat_datetime as 'Audit Date',
user_detail.ud_username as 'User',
AuditTrail.owat_details.value('(/DocumentElement/AuditTrailDetail/TableName)[2]','varchar(50)') AS TableName,
AuditTrail.owat_details.value('(/DocumentElement/AuditTrailDetail/RowID)[2]','varchar(50)') AS RowID,
AuditTrail.owat_details.value('(/DocumentElement/AuditTrailDetail/FieldName)[2]','varchar(50)') AS FieldName,
AuditTrail.owat_details.value('(/DocumentElement/AuditTrailDetail/ValueFrom)[2]','varchar(50)') AS ValueFrom,
AuditTrail.owat_details.value('(/DocumentElement/AuditTrailDetail/ValueTo)[2]','varchar(50)') AS ValueTo,
AuditTrail.owat_details.value('(/DocumentElement/AuditTrailDetail/Identifier)[2]','varchar(50)') AS Identifier
FROM
(select
orderwise_audit_trail.owat_id,
orderwise_audit_trail.owat_audit_type,
orderwise_audit_trail.owat_record_id,
orderwise_audit_trail.owat_record_type,
orderwise_audit_trail.owat_datetime,
orderwise_audit_trail.owat_ud_id,
convert(xml, orderwise_audit_trail.owat_details) as owat_details
from
orderwise_audit_trail) as AuditTrail
left join user_detail on user_detail.ud_id = AuditTrail.owat_ud_id
Where AuditTrail.owat_details is not NULL
and (AuditTrail.owat_details.value('(/DocumentElement/AuditTrailDetail/TableName)[2]','varchar(50)')) is not null
order by 1, 2, 3, 4