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java.lang.Object | +--algebraTree.Update
Objects of this class represent updates for a SchemaSQL wrapper. SchemaSQL updates include data updates as well as schema updates. Data updates can be add-tuple, delete-tuple, or update-tuple (with arbitrary changes in the data). A data update is represented by a "before-after" pair. If "before" is empty, we have an add, if "after" is empty, we have a delete, if both are not-null, we have an update. Schema changes are {add|del|ren}-{att|rel} such that the attribute/relation must be identified and the type of update too. These two updates classes are two subclasses of this one.
Field Summary | |
java.lang.String |
relation
the table name which this update concerns. |
Constructor Summary | |
Update()
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Methods inherited from class java.lang.Object |
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Field Detail |
public java.lang.String relation
Constructor Detail |
public Update()
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