2014/10/15 下午 10:14:38
iphone Programming Glossary: subqueryHow to correctly setup a NSPredicate for a to-many relationship when using Core Data? http://stackoverflow.com/questions/1347776/how-to-correctly-setup-a-nspredicate-for-a-to-many-relationship-when-using-core predicate in this case is the following one NSPredicate predicateWithFormat @ excludedOccurrences.@count 0 OR 0 SUBQUERY excludedOccurrences sub sub.day @ .@count today In the predicate a subquery is used to test if the number of related excludedOccurrences..
What's better way to build NSPredicate with to-many deep relationships? http://stackoverflow.com/questions/2006927/whats-better-way-to-build-nspredicate-with-to-many-deep-relationships here . Best regards Victor iphone core data nspredicate share improve this question My final solution is to use SUBQUERY. NSPredicate p NSpredicate predicateWithFormat @ name like @ AND 0 SUBQUERY entitiesB x 0 SUBQUERY x.entitiesC y y.name.. question My final solution is to use SUBQUERY. NSPredicate p NSpredicate predicateWithFormat @ name like @ AND 0 SUBQUERY entitiesB x 0 SUBQUERY x.entitiesC y y.name like @ .@count .@count nameA nameC Unfortunately I was unable to expand this.. solution is to use SUBQUERY. NSPredicate p NSpredicate predicateWithFormat @ name like @ AND 0 SUBQUERY entitiesB x 0 SUBQUERY x.entitiesC y y.name like @ .@count .@count nameA nameC Unfortunately I was unable to expand this query on nsExpression..
Core Data Many-to-Many Relationship NSPredicate http://stackoverflow.com/questions/2822625/core-data-many-to-many-relationship-nspredicate array of NSPredicate s. On one of the predicate I wanted to query EntityA using EntityC . I tried to use the following SUBQUERY but it did not work. searchPredicate NSPredicate predicateWithFormat @ 0 SUBQUERY EntityB B 0 SUBQUERY B.EntityC EntityC.. . I tried to use the following SUBQUERY but it did not work. searchPredicate NSPredicate predicateWithFormat @ 0 SUBQUERY EntityB B 0 SUBQUERY B.EntityC EntityC EntityC.name like @ .@count .@count name And I got the following exception Terminating.. the following SUBQUERY but it did not work. searchPredicate NSPredicate predicateWithFormat @ 0 SUBQUERY EntityB B 0 SUBQUERY B.EntityC EntityC EntityC.name like @ .@count .@count name And I got the following exception Terminating app due to uncaught..
How can I use NSPredicate to filter on core data relationships? http://stackoverflow.com/questions/3674055/how-can-i-use-nspredicate-to-filter-on-core-data-relationships the sub object the subs property of obj returns a set instead of a single object. To query the set you need to use a SUBQUERY. Subqueries have the form SUBQUERY collection individualCollectionItem expression with collection item in this case you.. of obj returns a set instead of a single object. To query the set you need to use a SUBQUERY. Subqueries have the form SUBQUERY collection individualCollectionItem expression with collection item in this case you would want something like SUBQUERY..
Quick Explanation of SUBQUERY in NSPredicate Expression http://stackoverflow.com/questions/3810992/quick-explanation-of-subquery-in-nspredicate-expression Explanation of SUBQUERY in NSPredicate Expression There appears to be zero documentation about the SUBQUERY keyword from Apple and I can't find.. Explanation of SUBQUERY in NSPredicate Expression There appears to be zero documentation about the SUBQUERY keyword from Apple and I can't find a simple explanation about it on SO or on Google. It's a conspiracy Please could someone.. Please could someone from the inner circle please just provide a quick explanation of its syntax so I can use it SUBQUERY Bs x x IN @ Thanks iphone cocoa cocoa touch nspredicate share improve this question This is what a subquery evaluates..
http://stackoverflow.com/questions/9630237/nspredicate-subquery-syntax @ 47cc67093475061e01000540 @ property_value @ Female NSPredicate p NSPredicate predicateWithFormat @ SUBQUERY row_values rv rv.property_id @ AND rv.property_value @ .@count 0 @ 47cc67093475061e01000540 @ Male NSArray filtered dataRows.. dataRows filteredArrayUsingPredicate p So let's see what this predicate is doing. Start with the outer most level SUBQUERY stuff .@count 0 A SUBQUERY returns an array of objects. We're going to run this SUBQUERY on every NSDictionary in the dataRows.. p So let's see what this predicate is doing. Start with the outer most level SUBQUERY stuff .@count 0 A SUBQUERY returns an array of objects. We're going to run this SUBQUERY on every NSDictionary in the dataRows array and we want to..
How to correctly setup a NSPredicate for a to-many relationship when using Core Data? http://stackoverflow.com/questions/1347776/how-to-correctly-setup-a-nspredicate-for-a-to-many-relationship-when-using-core @ excludedOccurrences.@count 0 OR 0 SUBQUERY excludedOccurrences sub sub.day @ .@count today In the predicate a subquery is used to test if the number of related excludedOccurrences with a date matching your test date is equal to zero. However..
http://stackoverflow.com/questions/3644849/core-data-try-to-use-nspredicate-to-filter-a-tomany-relationship-set-but-get-th to author instances which in turn has an alias attribute. The predicate cannot process the set. You need to use a subquery to jump a to many keypath. The subquery is essentially a nested predicate which searches a set and returns another set of.. an alias attribute. The predicate cannot process the set. You need to use a subquery to jump a to many keypath. The subquery is essentially a nested predicate which searches a set and returns another set of objects matching the nested predicate... look like @ theme.name_en @ AND 0 SUBQUERY quotes eachQuote eachQuote.author.alias @ .@count @ mytheme @ myauthor The subquery says Of the set of quotes take each quote object and test if its author relationship object has an alias attribute matching..
Quick Explanation of SUBQUERY in NSPredicate Expression http://stackoverflow.com/questions/3810992/quick-explanation-of-subquery-in-nspredicate-expression it SUBQUERY Bs x x IN @ Thanks iphone cocoa cocoa touch nspredicate share improve this question This is what a subquery evaluates to. Found from this mailing list thread the #1 hit for 鑥SPredicate subquery in Google. That bit of documentation.. this question This is what a subquery evaluates to. Found from this mailing list thread the #1 hit for 鑥SPredicate subquery in Google. That bit of documentation also explains how the predicate format string syntax relates to it. share improve..
http://stackoverflow.com/questions/6890079/subquery-in-core-data next predicate SUBQUERY color_ids sub sub.colorID 5 .@count 0 Thanks for your help. iphone objective c ios core data subquery share improve this question You don't need SUBQUERY for this. In fact you almost never need SUBQUERY it is extremely..
Subquery in SQLite query not working http://stackoverflow.com/questions/843604/subquery-in-sqlite-query-not-working HAVING depth 1 ORDER BY node.lft SQLite reports that sub_tree.name isn't a column and I assume this is because its subquery implementation is incomplete. Does anyone have any ideas about how to get around this limitation The purpose of the query.. of a given parent node. iphone sql database sqlite share improve this question Try using node.name AS name in the subquery i.e. SELECT node.name COUNT parent.name sub_tree.depth 1 AS depth FROM line_items AS node line_items AS parent line_items..
http://stackoverflow.com/questions/9630237/nspredicate-subquery-syntax subquery syntax I have sort of an unfriendly array of dictionaries that in turn have arrays of data and I am trying to filter the..
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