Re: FetchSpec setFetchLimit??
Re: FetchSpec setFetchLimit??
- Subject: Re: FetchSpec setFetchLimit??
- From: Chuck Hill <email@hidden>
- Date: Mon, 2 Mar 2009 15:43:20 -0800
On Mar 2, 2009, at 1:42 PM, Kieran Kelleher wrote:
I always thought that EOFetchSpecification.setFetchLimit( int n)
would generate SQL with LIMIT n tacked onto the end of the SQL
statement, but it appears not to.
This is the default behavior as not all databases implement this.
Specific plugins add this, IIRC.
Chuck
Instead it fetches the all qualifying records and does the LIMIT in
memory?! Has this always been the case .... or is it just the MySQL
driver?
For example:
<snip>
// Fetch the most recent shipped message
ERXSortOrderings s = CTMessage.XKEY_OID.descs();
ERXFetchSpecification<CTMessage> fs = new
ERXFetchSpecification<CTMessage>(CTMessage.ENTITY_NAME,null,s);
fs.setFetchLimit(1);
System.out.println("MailingAddressUtilitiesTests.suppressionTest():
fs.SQL = " + ERXEOAccessUtilities.sqlForFetchSpecification(ec, fs));
NSArray<CTMessage> objects = fs.fetchObjects(ec);
</snip>
..... generates the following SQL without "LIMIT 1" !!!
SELECT t0.oid, t0.oidcampaign, t0.oiddatarecord, t0.oidjob,
t0.oidlocation, t0.oidmediatemplate, t0.recaddtime, t0.recadduser,
t0.recmodtime, t0.recmoduser, RTRIM(t0.workflowstate) FROM message
t0 ORDER BY t0.oid DESC;
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--
Chuck Hill Senior Consultant / VP Development
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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