We have some code that we are using from Project Wonder (I think)
that adds an attribute programmatically to an EOEntity to do
things like count, max, etc. (See below). We were doing a load
test on our application and started throwing errors because a
different query was submitted using the extra attribute. It seems
that making changes to the EOModel is not thread safe. If that is
the case is there anything we can do to use this code? Or should
we dump this and build a regular fetch for the aggregate data. Any
thooughts or insights would be a huge help.
Query that was generated in error – notice the COUNT() attribute
embedded in the query incorrectly
"SELECT t0.ACTUALRATING, t0.BODY, t0.CLOSED, t0.DATEADDED,
t0.DATEMODIFIED, t0.FORUMID, t0.IPADDRESS, t0.LOCALEID,
t0.MODERATE, COUNT(t0.RECORDID), t0.PUBLISHED, t0.RECORDID,
t0.STATUS, t0.TITLE, t0.TYPE, t0.USERID, t0.USERNAME,
t0.USERNICKNAME, t0.WEIGHTEDRATING FROM DBTOPIC t0 WHERE
t0.RECORDID = ?" withBindings:
1:"0032274bc94901122623a943007f46"(recordID)>:
Next exception:SQL State:42000 -- error code: 937 -- msg:
ORA-00937: not a single-group group function
This is the code that we use to add the temporary attribute.
public static Number
aggregateNumberFunctionWithQualifier(EOEditingContext ec, String
entityName, String attributeName, String function, EOQualifier
qualifier) { EOEntity entity = EOUtilities.entityNamed(ec,
entityName); NSArray results = null; EOAttribute
attribute = createAggregateAttribute(ec, function, attributeName,
entityName, "java.lang.Number", "i"); EOQualifier
schemaBasedQualifier =
entity.schemaBasedQualifier(qualifier);
EOFetchSpecification fs = new EOFetchSpecification(entityName,
schemaBasedQualifier, null); synchronized (entity)
{ entity.addAttribute(attribute);
try{ fs.setFetchesRawRows(true);
fs.setRawRowKeyPaths(new
NSArray(attribute.name())); results =
ec
.objectsWithFetchSpecification
(fs
); }finally
{ entity
.removeAttribute(attribute); } } if
((results != null) && (results.count() == 1))
{ NSDictionary row = (NSDictionary)
results.lastObject(); if
(row.objectForKey(attribute.name()) != null &&
row.objectForKey(attribute.name()) instanceof Number)
{ return (Number)
row.objectForKey(attribute.name()); } }
return null; }
Dov Rosenberg
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