I have three tables in a derby database. Schedule, EmployeeSchedule, EmployeeScheduleInfo. Schedule has a list of EmployeeSchedule and EmployeeSchedule has a list of EmployeeScheduleInfo.
我使用日蚀链接 jpa, 我从 Netbeans 生成了我的实体和控制器。 我的问题是, 当我从数据库装入一个调度对象时, 我从数据库中装入所有员工列表对象中的雇员ScheduleInfo 对象列表没有被装入, 当我调试这个对象时
{IndirectList: not instantiated}
1:M and ManyToMany relationships are lazy by default in JPA. That means you need to access the relationship for them to be fetched - call size() on the collection to view it in a debugging environment. You can also prefetch the collection in the initial query using fetch join in the JPQL or an EclipseLink eclipselink.join-fetch query hint: http://wiki.eclipse.org/Using_EclipseLink_JPA_Extensions_(ELUG)#Join_Fetch
$db_user="root"; $db_host="localhost"; $db_password="root"; $db_name = "fayer"; $conn = mysqli_connect($db_host,$db_user,$db_password,$db_name) or die ("couldn t connect to server"); // perform query ...
I am in the early stages of developing a database-driven system and the largest part of the system revolves around an inheritance type of relationship. There is a parent entity with about 10 columns ...
I m writing a Java web app in my free time to learn more about development. I m using the Stripes framework and eventually intend to use hibernate and MySQL For the moment, whilst creating the pages ...
Does anybody know if it is possible to move some (not all) users from one ASP.NET membership database to another? (for the purposes of migrating some users to another database on another machine, but ...
Is it because of size? By the way, what is the limit of the size?
I am trying to join two tables that reside in two different databases. Every time, I try to join I get the following error: An association from the table xxx refers to an unmapped class. If the ...
For example, I have a table, and there is a column named Tags . I want to know if value programming exists in this column. How can I do this in ADO.NET? I did this: OleDbCommand cmd = new ...
I m trying to migrate one of my PHP projects to Doctrine. I ve never used it before so there are a few things I don t understand. In my current code, I have a class similar to this: class ...