And one more thing... :-)
On Feb 9, 2006, at 3:40 PM, Owen McKerrow wrote:
Get Authors :2006-02-09 23:11:17 Etc/GMT
[2006-02-10 10:11:16 EST] <WorkerThread0> === Begin Internal
Transaction
[2006-02-10 10:11:16 EST] <WorkerThread0> evaluateExpression:
<com.webobjects.jdbcadaptor.OpenBasePlugIn$OpenBaseExpression:
"SELECT DISTINCT t0.academicGeneral, t0.accessLevel,
t0.brandNewRecord, t0.countryID, t0.email, t0.fileName,
t0.filePath, t0.hasFile, t0.institution, t0._rowid,
t0.serialNumber, t0.staffNumber, t0.title, t0.tobeShown, t0.type,
t0.updatedNightly, t0.URL FROM PERSON t0, PERSON_NAME T1 WHERE
t0.type = ? AND t0._rowid = T1.personID ORDER BY T1.lastName ASC"
withBindings: 1:4(type)>
[2006-02-10 10:11:18 EST] <WorkerThread0> 1885 row(s) processed
[2006-02-10 10:11:18 EST] <WorkerThread0> === Commit Internal
Transaction
You note that "there about 5 people in the DB which actually have
more than 1 name"
You might get some overall speed improvement by not sorting in the
DB. The DB side sort requires the above to many join creating
redundant rows (and which to my eyes is not even going to return in
an determinate order when there is more than one matching row in
person_name). You may do better getting an unsorted list and sorting
in memory by activeName().
This is even more likely to be the case if you do some caching. It
is easy to cache values in instance variables in an EO. The hard
part is knowing when these values are out of date and need to be
regenerated. :-)
Add this to your External class:
protected String activeName = null;
/**
* Overridden to clear cached values when object changed
* in another ec.
*/
public void awakeFromFetch(EOEditingContext ec) {
super.awakeFromFetch(ec);
clearCachedValues();
}
/**
* Overridden to clear cached values when object reverted
* in ec.
*/
public void updateFromSnapshot(NSDictionary aSnapshot) {
super.updateFromSnapshot(aSnapshot);
clearCachedValues();
}
/**
* Clears all cached values. This method should be overridden
* in subclasses to clear the actual cached values.
*/
public void clearCachedValues() {
activeName = null;
}
public PersonName activeName()
{
if (activeName == null) {
int i;
PersonName theName= null;
for (i=0;i<personNames().count();i++) {
PersonName temp =
(PersonName)personNames().objectAtIndex(i);
if ( temp.active().intValue() == 1 ) {
theName = temp;
break;
}
}
}
return theName;
}
You will also need to add a call to clearCachedValues() when a new
name is made active.
Chuck
--
Coming in 2006 - an introduction to web applications using WebObjects
and Xcode http://www.global-village.net/wointro
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve specific
problems. http://www.global-village.net/products/practical_webobjects
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