composite-key

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Hibernate: Strategy/pattern for object and entity identity mapping using composite keys?

What is a general collision-free Java best practice to generate hash codes for any-type (atomic types) multi-column primary keys?[详细]

2023-01-08 09:55 分类：问答
Normalization is better or composite primary key is better?

I have a table in Oracle DB,say, Student table. StudentID is the primary key in the table.I have another column interested subjects,say columns name is interested_SUB. A student can have more than one[详细]

2023-01-08 05:43 分类：问答
How can I efficiently compute the MAX of one column, ordered by another column?

I have a table schema similar to the following (simplified): CREATE TABLE Transactions ( TransactionID int NOT NULL IDENTITY(1, 1) PRIMARY KEY CLUSTERED,[详细]

2023-01-05 05:10 分类：问答
Hibernate MapKeyManyToMany gives composite key where none exists

I have a Hibernate (3.3.1) mapping of a map using a three-way join table: @Entity public class SiteConfiguration extends ConfigurationSet {[详细]

2023-01-03 20:51 分类：问答
LINQ's pathetic handling of composite keys

I have a table that has a composite key that consists of two int fields and one varchar(50) field. I made the composite key my primary key, which I don\'t usually do. Yes, yes, yes, I\'m more than fam[详细]

2023-01-02 09:45 分类：问答
Hibernate Auto-Increment not working

I have a column in my DB that is set with Identity(1,1) and I can\'t get hibernate annotations to work for it.I get errors when I try to create a new record.[详细]

2022-12-31 19:19 分类：问答
How to identify composite primary key in any Mysql Database table?

How to identify composite primary key in any Mysql Database table? or EDIT 2 what sql query should be used to[详细]

2022-12-30 07:24 分类：问答
NHibernate update using composite key

I have a table defnition as given below: License ClientId Type Total Used ClientId and Type together uniquely identifies a row. I have a mapping file as given below:[详细]

2022-12-30 02:45 分类：问答
NHibernate Composite Key

I have created a composite key, and it is working, but ideals I would like the separate directly fields in the row class.[详细]

2022-12-28 10:02 分类：问答
How do I map a composite primary key in Entity Framework 4 code first?

I\'m getting to grips with EF4 code first, and liking it so far. But I\'m having trouble mapping an entity to a table with a composite primary key.[详细]

2022-12-28 07:29 分类：问答