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| | == Description == | | == Description == |
| | | | |
| − | The task element is described in the [[Task_Management_Method#Task|"Task Management Method"]]. The tasks in the project are stored in a table in the project database. The name does not have to be unique. Therefore, a task also has to have a unique id. Since a task represents a graphical element, it has a position, a width and a height. When using a true-type font, the width and height will be determined when the task is displayed. | + | The task element is described in the [[Task_Management_Method#Task|"Task Management Method"]]. The tasks in the project are stored in a table in the project database. The name of a task does not have to be unique, a task has to have a unique id which can be generated as a integer primary key<ref name="primary_key">[http://www.sqlite.org/lang_createtable.html#rowid rowid - SQLite specification]</ref> by the database. Since a task represents a graphical element, it has a position, a width and a height. The TaskDepender™ program uses a true-type font, and therefore the width and height will be determined when the task is displayed. |
| | + | |
| | + | == Constraints == |
| | + | |
| | + | The following constraints apply for the tasks table: |
| | + | * When a container task is deleted, the contained tasks need to be deleted as well. |
| | + | * When a resource is deleted that is the responsible resource for a task, the resource is set to undefined. |
| | | | |
| | == Design == | | == Design == |
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| | | <tt>ResourceId</tt> || integer || Id of the person responsible for the task as defined in the [[Resources database table|<tt>Resources</tt> table]]. | | | <tt>ResourceId</tt> || integer || Id of the person responsible for the task as defined in the [[Resources database table|<tt>Resources</tt> table]]. |
| | |- valign="top" | | |- valign="top" |
| − | | <tt>X</tt> || integer || The x-coordinate of the task in the diagram. | + | | <tt>X</tt> || integer || The x-coordinate of the task in the diagram, expressed in pixels. |
| | |- valign="top" | | |- valign="top" |
| − | | <tt>Y</tt> || integer || The y-coordinate of the task in the diagram. | + | | <tt>Y</tt> || integer || The y-coordinate of the task in the diagram, expressed in pixels. |
| | + | |- valign="top" |
| | + | | <tt>Width</tt> || integer || The width of the task in the diagram, expressed in pixels. |
| | + | |- valign="top" |
| | + | | <tt>Height</tt> || integer || The height of the task in the diagram, expressed in pixels. |
| | |- valign="top" | | |- valign="top" |
| | | <tt>ContainerId</tt> || integer || The id of the container task. Set to 0 if defined at the top level. | | | <tt>ContainerId</tt> || integer || The id of the container task. Set to 0 if defined at the top level. |
| | |} | | |} |
| | | | |
| − | There is are two constraints for the table:
| |
| − | * When its container is deleted, the contained task must be deleted as well.
| |
| − | * When the resource with the <tt>ResourceId</tt> is deleted, the value of the <tt>ResourceId</tt> is to be set to NULL.
| |
| − | This can be done by [http://www.sqlite.org/foreignkeys.html#fk_actions referencing] these columns to the appropriate columns.
| |
| − |
| |
| − | The following actions are defined on the tasks table:
| |
| − |
| |
| − | ;Create:When a new project is created, the tasks table must be created as well. When creating the table, the constraint must be implemented that when the task is contained in a container which is deleted, the task needs to be deleted as well. This is done by self-referencing the <tt>ContainerId</tt> column to the <tt>Id</tt> column.
| |
| − |
| |
| − | ;Insert:Since a task can only be added in the current container, the <tt>ContainerId</tt> does not have to be supplied but can be retrieved from the [[State variables database table|<tt>StateVariables</tt>]] table.
| |
| − |
| |
| − | ;Update:A task can only be updated when it is selected. The selected tasks are stored in the [[Selected tasks database table|selected tasks table]]. This means that the user does not have to supply the id when updating a selected task. This means that the caller must ensure that only one task is selected.
| |
| − |
| |
| − | ;Delete:Only selected tasks can be deleted. This means that the user does not have to supply an id, but simply all selected tasks are deleted.
| |
| − |
| |
| − | ;Cut:As described in [[Cut selected elements|"Cut selected elements"]], selected elements can be 'cut to the clipboard' by setting the <tt>ContainerId</tt> column to the maximum integer value.
| |
| − |
| |
| − | ;Paste:As described in [[Paste elements|"Paste elements"]], elements can be pasted into the current diagram by setting the <tt>ContainerId</tt> column to the current container. This is done by finding all the tasks that have this <tt>ContainerId</tt> set to the maximum integer value.
| |
| − |
| |
| − | == Implementation ==
| |
| − |
| |
| − | === Interface structure ===
| |
| − |
| |
| − | <syntaxhighlight lang="c">
| |
| − | typedef struct
| |
| − | {
| |
| − | uint32 id,
| |
| − | char* name,
| |
| − | char* description,
| |
| − | char* resource,
| |
| − | uint x,
| |
| − | uint y,
| |
| − | uint32 container_id
| |
| − | } tdd_task;
| |
| − | </syntaxhighlight>
| |
| − |
| |
| − | === Create table ===
| |
| − |
| |
| − | <syntaxhighlight lang="sql">
| |
| − | CREATE TABLE Tasks
| |
| − | (
| |
| − | Id INTEGER PRIMARY KEY,
| |
| − | Name TEXT,
| |
| − | Description TEXT,
| |
| − | ResourceId INTEGER REFERENCES Resources(Id) ON DELETE SET NULL,
| |
| − | X INTEGER,
| |
| − | Y INTEGER,
| |
| − | ContainerId INTEGER REFERENCES Tasks(Id) ON DELETE CASCADE
| |
| − | )
| |
| − | </syntaxhighlight>
| |
| − |
| |
| − | === Insert ===
| |
| − |
| |
| − | <syntaxhighlight lang="sql">
| |
| − | INSERT INTO Tasks
| |
| − | (Name,Description, Resource, X, Y, ContainerId)
| |
| − | VALUES (%s, %s, %s, %d, %d, (SELECT Val FROM StateVariables WHERE Name='CurrentContainerId'))
| |
| − | </syntaxhighlight>
| |
| − |
| |
| − | === Update ===
| |
| − |
| |
| − | <syntaxhighlight lang="sql">
| |
| − | UPDATE Tasks SET
| |
| − | Name=%s,
| |
| − | Description=%s,
| |
| − | Resource=%s,
| |
| − | X=%d,
| |
| − | Y=%d
| |
| − | WHERE Id IN (SELECT Id FROM SelectedTasks)
| |
| − | </syntaxhighlight>
| |
| − |
| |
| − | === Delete selected tasks ===
| |
| − |
| |
| − | <syntaxhighlight lang="sql">
| |
| − | DELETE FROM Tasks WHERE Id IN (SELECT Id FROM SelectedTasks)
| |
| − | </syntaxhighlight>
| |
| − |
| |
| − | === Cut selected tasks ===
| |
| | | | |
| − | <syntaxhighlight lang="sql">
| + | The following actions are defined: |
| − | UPDATE Tasks SET ContainerId=MAXINT WHERE Id IN (SELECT Id FROM SelectedTasks)
| + | * [[Tasks database table - Create|Create]] |
| − | </syntaxhighlight>
| + | * [[Tasks database table - Insert|Insert]] |
| | + | * [[Tasks database table - Update|Update]] |
| | + | * [[Tasks database table - Delete|Delete]] |
| | + | * [[Tasks database table - Cut|Cut]] |
| | + | * [[Tasks database table - Paste|Paste]] |
| | | | |
| − | === Paste tasks === | + | == References == |
| | + | <references/> |
| | | | |
| − | <syntaxhighlight lang="sql">
| |
| − | UPDATE Tasks SET ContainerId=(SELECT Val FROM StateVariables WHERE Name='CurrentContainerId') WHERE ContainerId=MAXINT
| |
| − | </syntaxhighlight>
| |
| | | | |
| | ---- | | ---- |
| | * [[Database]] | | * [[Database]] |
