Extracting XML data using SQL - sql

Question

I would like to be able to extract specific data from a XML type using Oracle in my example for the customer named "Arshad Ali"
This is my xml data that was inserted:
<Customers>
<Customer CustomerName="Arshad Ali" CustomerID="C001">
<Orders>
<Order OrderDate="2012-07-04T00:00:00" OrderID="10248">
<OrderDetail Quantity="5" ProductID="10" />
<OrderDetail Quantity="12" ProductID="11" />
<OrderDetail Quantity="10" ProductID="42" />
</Order>
</Orders>
<Address> Address line 1, 2, 3</Address>
</Customer>
<Customer CustomerName="Paul Henriot" CustomerID="C002">
<Orders>
<Order OrderDate="2011-07-04T00:00:00" OrderID="10245">
<OrderDetail Quantity="12" ProductID="11" />
<OrderDetail Quantity="10" ProductID="42" />
</Order>
</Orders>
<Address> Address line 5, 6, 7</Address>
</Customer>
<Customer CustomerName="Carlos Gonzlez" CustomerID="C003">
<Orders>
<Order OrderDate="2012-08-16T00:00:00" OrderID="10283">
<OrderDetail Quantity="3" ProductID="72" />
</Order>
</Orders>
<Address> Address line 1, 4, 5</Address>
</Customer>
</Customers>
</ROOT>
using get clob I was able to extract all of the customers.
Was wondering if anyone could help me extract data for a specific customer.. tried using the following but was unsuccessful
SELECT extract(OBJECT_VALUE, '/root/Customers') "customer"
FROM mytable2
WHERE existsNode(OBJECT_VALUE, '/customers[CustomerName="Arshad Ali" CustomerID="C001"]')
= 1;

Answer 1

The case and exact names of the XML nodes matter:
SELECT extract(OBJECT_VALUE,
'/ROOT/Customers/Customer[#CustomerName="Arshad Ali"][#CustomerID="C001"]') "customer"
FROM mytable2
WHERE existsnode (OBJECT_VALUE,
'/ROOT/Customers/Customer[#CustomerName="Arshad Ali"][#CustomerID="C001"]') = 1
db<>fiddle
If you only want to search by name then only use that attribute:
SELECT extract(OBJECT_VALUE,
'/ROOT/Customers/Customer[#CustomerName="Arshad Ali"]') "customer"
FROM mytable2
WHERE existsnode (OBJECT_VALUE,
'/ROOT/Customers/Customer[#CustomerName="Arshad Ali"]') = 1
But extract() and existsnode() are deprecated; use xmlquery() and xmlexists() instead:
SELECT xmlquery('/ROOT/Customers/Customer[#CustomerName="Arshad Ali"][#CustomerID="C001"]'
passing object_value
returning content) "customer"
FROM mytable2
WHERE xmlexists('/ROOT/Customers/Customer[#CustomerName="Arshad Ali"][#CustomerID="C001"]'
passing object_value)
db<>fiddle