The ATTACH statement attaches a portion of a message tree into a new position in the message hierarchy.
The following example illustrates how to use the ATTACH statement, together with the DETACH statement described in DETACH statement, to modify a message structure. The dynamic reference supplied to the DETACH statement must point to a modifiable message tree such as Environment, LocalEnvironment, OutputRoot, OutputExceptionList, or InputLocalEnvironment.
There are some limitations on the use of ATTACH. In general, elements detached from the output trees of a Compute node are not attached to the environment or to input trees.
<Data> <Order> <Item>cheese <Type>stilton</Type> </Item> <Item>bread</Item> </Order> <Order> <Item>garlic</Item> <Item>wine</Item> </Order> </Data>the following ESQL statements:
SET OutputRoot = InputRoot; DECLARE ref1 REFERENCE TO OutputRoot.XML.Data.Order[1].Item[1]; DETACH ref1; ATTACH ref1 TO OutputRoot.XML.Data.Order[2] AS LASTCHILD;result in the following new message structure:
<Data> <Order> <Item>bread</Item> </Order> <Order> <Item>garlic</Item> <Item>wine</Item> <Item>cheese <Type>stilton</Type> </Item> </Order> </Data>
For information about dynamic references see Creating dynamic field references.
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