CQL for Cassandra 2.0


Registers a trigger on a table.


CREATE TRIGGER trigger_name ON table_name
USING 'java_class'

Synopsis Legend

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  • Lowercase means not literal
  • Italics mean optional
  • Ellipsis (...) means repeatable
  • Orange ( and ) means not literal, indicates scope



The initial implementation of triggers includes the capability to register a trigger on a table using the familiar CREATE TRIGGER syntax. This implementation is experimental.
  ON myTable
  USING 'org.apache.cassandra.triggers.InvertedIndex'

The actual logic that makes up the trigger can be written in any Java (JVM) language and exists outside the database. The Java class in this example that implements the trigger is named org.apache.cassandra.triggers and defined in an Apache repository. You place the trigger code in a lib/triggers subdirectory of the Cassandra installation directory, it loads during cluster startup, and exists on every node that participates in a cluster. The trigger defined on a table fires before a requested DML statement occurs, which ensures the atomicity of the transaction.