On 24/11/2014 5:26pm, Andrus Adamchik wrote: >> Will there be any awareness inside Cayenne of whether the column is already >> in a case-insensitive collation? Is that even possible in JDBC4? > We've discussed it before and didn't have a solution (other than a global > policy for the entire app). Perhaps we can implement some "adaptive" > algorithm that gradually accumulates collation metadata over time for the > queries run by the app. Haven't given it much thought yet. Perhaps we can > start a separate thread if we want to discuss the backend (vs. the user API).
Yes, good point. Perhaps we need a big warning in the javadocs like this: ...likeIgnoreCase() Note: Case insensitive matching is implemented in Cayenne by performing UPPER() on both sides of the query. Where you haven't added a functional index for this purpose (and some databases do not support functional indices at all), this can result in a huge performance hit. Use this method with caution and consider instead switching your database column to a case insensitive collation for better performance. ...like() Although this method appears to be juxtaposed with likeIgnoreCase(), if your column collation is case-insensitive, this method will always perform a case insensitive search. Ari -- --------------------------> Aristedes Maniatis GPG fingerprint CBFB 84B4 738D 4E87 5E5C 5EFA EF6A 7D2E 3E49 102A
