chenlong85.2004 schrieb: > could you help mei to explain the structure of workflow database > table structure?
The following tables hold workflow specifications:
- Table "workflow"
When a new workflow is defined, a new row is inserted into the
"workflow" table. The "workflow_id" is automatically assigned
(AUTO_INCREMENT) and the "workflow_version" is set to "1".
When an existing workflow is changed, a new row is inserted into
the "workflow" table. The "workflow_id" is automatically assigned
(AUTO_INCREMENT) and the "workflow_version" is incremented.
The "workflow_version_is_latest" column serves as a flag for
efficiently fetching the latest version of a workflow.
- Table "node"
When a new workflow is defined, a new row is inserted into the
"node" table for every node of the workflow's graph.
When an existing workflow is changed, a new row is inserted into
the "node" table for every node of the workflow's graph.
- Table "node_connection"
The "node_connection" table connects the nodes from the "node"
table.
- Table "variable_handler"
The "variable_handler" table stores the information about the
variable handlers of a workflow.
The following tables are used at workflow runtime:
- Table "execution"
When the execution of a workflow is started, a new row is inserted
into the "execution" table.
When the execution of a workflow is ended, the corresponding rows
are deleted from the "execution" and "execution_state" tables.
- Table "execution_state"
When the execution of a workflow is suspended, a new row is
inserted into the "execution_state" table for each node of the
workflow that is activated at the time.
When the execution of a workflow is resumed, the corresponding
rows are deleted from the "execution_state" table.
--
Sebastian Bergmann
System Developer
s...@ez.no | eZ Systems | http://ez.no
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