jdoql

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Using the 'INTO' keyword in JDOQL with GAE

I have a persistent class, \'Meeting\' that has a \'minute\' and \'hour\' field among others. I only need these two fields to populate a dropdown in my ui. The example I found tells me that I can crea[详细]

2023-01-19 05:55 分类：问答
Rounding a value in JDOQL

I\'ve got data in the GAE data store. I want to write a JDOQL against that data that takes one of the columns and rounds the 开发者_开发技巧value of it. Can I do this?do you mean, can you update the d[详细]

2023-01-19 04:55 分类：问答
Why does JDOQL query using "matches" semantics only work with a literal?

I\'m trying to construct a JDOQL query (using datanucleus) that will search for m开发者_Python百科atches of a parent class based on criteria in an owned one-to-many child class.The query looks like th[详细]

2023-01-17 16:40 分类：问答
Problem with JDOQL to obtain results with a "contains" request

I am using Google App Engine for a project and I need to do some queries on t开发者_如何学Gohe database. I use the JDOQL to ask the database. In my case I want to obtain the university that contains t[详细]

2023-01-17 10:43 分类：问答
How to query for an interface and filter the resultset with JDOQL?

I have an interface @PersistenceCapable public interface MyInterface { public abstract String getName();[详细]

2023-01-15 11:58 分类：问答
What does ":P" mean in a JDO query

I am using JDO on google app engine. Each \'Employee\' has a \'key\'. I have a set of keys and wanted to retrieve all Employees whose key belongs to this set.[详细]

2023-01-11 22:11 分类：问答
Declarative JDOQL vs Single-String JDOQL : performance

When querying with JDOQL is there a performance difference between using the declarative version a开发者_Go百科nd the Single-String version:[详细]

2023-01-01 03:24 分类：问答
Java: JDOQL startsWith query, case sensitive

I\'m using the .startsWith() filter in a JDOQL query but it\'s case sensitive. So start开发者_Go百科sWith(\"ab\") doesn\'t return \"Abc\" result and so on.[详细]

2022-12-30 16:42 分类：问答
How to delete specific record from Google Datastore (in Java)?

I have some records in datastore, I want to delete a specific record from the table. for example in SQL , we use delete * from table1 where name =\"mike\" what is the equivalent code in java (I m usin[详细]

2022-12-28 14:52 分类：问答
Subqueries on Java GAE Datastore

I am trying to create a database of users with connection between users (friends list). There are 2 main tables: UserEntity (main field id) and FriendEntity with fields:[详细]

2022-12-27 07:26 分类：问答