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When adding or editing a project or a resource, the user may also add or change the associated data in the Assignments table. The addAssignment procedure adds a new record as follows: CREATE PROCEDURE addAssignment ( @projectID uniqueidentifier, @resourceID varchar(10), @assigned datetime, @role int, @newLastChanged timestamp output ) AS INSERT INTO Assignments (ProjectId,ResourceId,Assigned,Role) VALUES (@projectId,@resourceId,@assigned,@role) SELECT @newLastChanged = LastChanged FROM Assignments WHERE ProjectId=@projectId AND ResourceId=@resourceId RETURN This procedure may be called during the adding or editing of either a Project or a Resource object in the application. Like addProject, this procedure ends with a SELECT statement that returns the new value of the LastChanged column for the row as an output parameter. This value must be maintained by the business object to allow for future updates of the row using the updateAssignment stored procedure.

DESCRIPTION This structure contains all of the data for a query node: NodeId -- the internal id number for a node ParentNodeId -- the internal id for the parent node (used for insert) SubQuery -- is this the start of a subquery Child -- is this a Left or Right child of the parent NodeType -- synonymous with operation type JoinType -- if a join, this is the join operation join_con_type -- if this is a join, this is the "on" condition

We need a slightly more complex example, so use the following .plist file, which contains a nested dictionary:

Likewise, there s a requirement to update records in the Assignments table: CREATE PROCEDURE updateAssignment ( @projectId uniqueidentifier, @resourceId int, @assigned datetime, @role int, @lastChanged timestamp, @newLastChanged timestamp output ) AS UPDATE Assignments SET Assigned=@assigned, Role=@role WHERE ProjectId=@projectId AND ResourceId=@resourceId AND LastChanged=@lastChanged IF @@ROWCOUNT = 0 RAISERROR('Row has been edited by another user', 16, 1)

Expressions -- the expressions from the "where" clause for this node Join Expressions -- the join expressions from the "join" clause(s) Relations[] -- the relations for this operation (at most 2) PreemptPipeline -- does the pipeline need to be halted for a sort Fields -- the attributes for the result set of this operation Left -- a pointer to the left child node Right -- a pointer to the right child node */ struct query_node { query_node(); //query_node(const query_node &o); ~query_node(); int nodeid; int parent_nodeid; bool sub_query; bool child; query_node_type node_type; type_join join_type; join_con_type join_cond; COND *where_expr; COND *join_expr; TABLE_LIST *relations[4]; bool preempt_pipeline; List<Item> *fields; query_node *left; query_node *right; }; query_node *root; //The ROOT node of the tree

SELECT @newLastChanged = LastChanged FROM Assignments WHERE ProjectId=@projectId AND ResourceId=@resourceId RETURN As with addAssignment, this may be called when updating data from either a Project or a Resource object. Notice the @lastChanged parameter. It is used in the same way the parameter was used in updateProject: to implement first-write-wins optimistic concurrency. If the UPDATE statement succeeds, the new value of the LastChanged column is returned as a result through an output parameter so the business object can maintain the new value.

~Query_tree(void); void ShowPlan(query_node *QN, bool PrintOnRight); }; With the query tree header file you also need the query tree source file. The source file must provide the code for the constructor and destructor methods of the query tree class. Listing 10-13 shows the completed constructor and destructor methods. Create the query_tree.cc file and enter this code (or download it). Place this file in the /sql directory of your MySQL source tree. I ll show you how to add it to the project in a later section.