TimeConstraintpublic class TimeConstraint extends DatabaseItem | Source code from "Java Distributed Computing", by Jim Farley.
Class: TimeConstraint
Example: 7-5
Description: Data pertaining to a temporal constraint between two tasks. |
| Fields Summary |
|---|
| int | ctype | | int | task1 | | int | task2 |
| Constructors Summary |
|---|
public TimeConstraint(int type, int tid1, int tid2, boolean insert)
ctype = type;
task1 = tid1;
task2 = tid2;
if (insert) {
// Create a new record in the database.
try {
Statement s = DatabaseItem.dbConn.createStatement();
int numr = s.executeUpdate("INSERT INTO time_constraint "
+ "(type, task1, task2) VALUES ("
+ type + ", " + task1 + ", " + task2 + ")");
if (numr != 1)
valid = false;
else
valid = true;
}
catch (SQLException e) {
valid = false;
}
}
|
| Methods Summary |
|---|
| public static java.util.Vector | constraintsFor(int tid)
Vector constraints = new Vector();
try {
Statement s = DatabaseItem.dbConn.createStatement();
ResultSet r = s.executeQuery("SELECT task1, task2, type FROM "
+ "time_constraint where task1 = "
+ tid + " or task2 = " + tid);
while (r.next()) {
int tid1 = r.getInt("task1");
int tid2 = r.getInt("task2");
int type = r.getInt("type");
TimeConstraint c = new TimeConstraint(type, tid1, tid2,
false);
constraints.addElement(c);
}
}
catch (Exception e) {}
return constraints;
| | public int | getTask1Id() return task1;
| | public int | getTask2Id() return task2;
| | public int | getType() return ctype;
| | public boolean | updateFromDbase() return false;
| | public boolean | updateToDbase() return false;
|
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