jdo

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Why error "Joins are only supported when all filters are 'equals' filters."

I am not sure what am I doning wrong here? It complains \"Joins are only supported when all fi开发者_运维技巧lters are \'equals\' filters.\" when the query is executed. How can I get around that?[详细]

2023-03-22 02:46 分类：问答
How to return the actual type rather than an Object type from a method that can work for multiple Class types?

Is there any way to modify the findModel method in SubService to return a Foo or Boo type rather than an Object type.[详细]

2023-03-21 21:45 分类：问答
Deleting Child Entities in JDO

I would like to know if the following is possible in JDO. I have a 1-N relationship between a Parent and a Child class. So my classes look like[详细]

2023-03-21 20:16 分类：问答
How to achieve SQL IN query in JDOQL?

Are this JDOQL same as the following SQL? Query query = pm.newQuery(Vote.class, \":p.contains(personId)\");[详细]

2023-03-21 18:23 分类：问答
Why Objectify instead of JDO?

I am approaching to Gwt + Gae world. My essential need is to send over the Gwt-Rpc wire my Entity classes, without duplicating them into DTOs.[详细]

2023-03-21 15:49 分类：问答
Why can't I add save more than 1 object in my LinkedList while using JDO?

I am using google app engine and JDO. In one of my servlets i am adding objects in a linkedlist and saving everything using persistence manager. Till the end of servlet it shows that everything is wor[详细]

2023-03-17 19:08 分类：问答
html value of select option to jdo object

I\'m doing an query and getting a list of albums names from my JDO, they are then displayed in a selection menu in html like this[详细]

2023-03-17 16:26 分类：问答
Google Datastore - Problems updating entity

I am dusting off my google app-engine / datastore skills ... and getting stuck on something very simple.[详细]

2023-03-16 20:19 分类：问答
How to get entry from datastore by position it was added? (Google app engine and JDO)

Here is my example: Add new entry to datastore //position 1 Add new entry to datastore //position 2 Add new entry to datastore //position 3[详细]

2023-03-16 12:25 分类：问答
Google says JDO doesn't do cascading deletes from Datastore. So how do you do it?

Google says: Note: The JDO implementation does the work to delete dependent child objects, not the datastore. If you delete a parent entity using the low-level API开发者_JAVA百科 or the Admin Consol[详细]

2023-03-16 11:23 分类：问答