How to read an option from XML in T-SQL? - sql-server

Question

I have the next XML file:
<?xml version="1.0" encoding="utf-8"?>
<DynamicEntity Name="ProductsMilk">
<Field Name="Name" Type="nvarchar(256)" AllowNulls="false" />
<Field Name="Description" Type="ntext" AllowNulls="false" />
<Field Name="Price" Type="float" AllowNulls="false" />
</DynamicEntity>
I need to read some value from any option of XML-node, for e.g. I need to read the value of Type option from Field node using T-SQL.
How can I do this using internal OpenXML provider in MSSQL?

Answer 1

The following will extract all the data from your XML:
DECLARE #doc VARCHAR(1000) = '<?xml version="1.0" encoding="utf-8"?>
<DynamicEntity Name="ProductsMilk">
<Field Name="Name" Type="nvarchar(256)" AllowNulls="false" />
<Field Name="Description" Type="ntext" AllowNulls="false" />
<Field Name="Price" Type="float" AllowNulls="false" />
</DynamicEntity>';
DECLARE #iDoc INT;
EXECUTE sp_xml_preparedocument #idoc OUTPUT, #doc;
SELECT *
FROM OPENXML(#iDoc, 'DynamicEntity/Field')
WITH
( DynamicEntityName VARCHAR(100) '../#Name',
FieldName VARCHAR(100) '#Name',
[Type] VARCHAR(100) '#Type',
AllowNulls VARCHAR(100) '#AllowNulls'
);
Basically, you just need to specify a column mapping for your xml attributes.

Answer 2

Here is a solution:
DECLARE #x XML = '<?xml version="1.0" encoding="utf-8"?>
<DynamicEntity Name="ProductsMilk">
<Field Name="Name" Type="nvarchar(256)" AllowNulls="false" />
<Field Name="Description" Type="ntext" AllowNulls="false" />
<Field Name="Price" Type="float" AllowNulls="false" />
</DynamicEntity>'
SELECT t.c.value(N'../#Name', N'nvarchar(100)'),
t.c.value(N'#Name', N'nvarchar(100)'),
t.c.value(N'#Type', N'nvarchar(100)'),
t.c.value(N'#AllowNulls', N'nvarchar(100)')
FROM #x.nodes(N'/DynamicEntity/Field') t(c)