composite-key

Should Hibernate be able to handle overlapping foreign keys?

由 自作多情 提交于 2019-11-26 20:15:34
问题 I have a table that has two foreign keys to two different tables with both foreign keys sharing one column : CREATE TABLE ZipAreas ( country_code CHAR(2) NOT NULL, zip_code VARCHAR(10) NOT NULL, state_code VARCHAR(5) NOT NULL, city_name VARCHAR(100) NOT NULL, PRIMARY KEY (country_code, zip_code, state_code, city_name), FOREIGN KEY (country_code, zip_code) REFERENCES Zips (country_code, code), FOREIGN KEY (country_code, state_code, city_name) REFERENCES Cities (country_code, state_code, name)

Creating Composite Key Entity Framework

由 无人久伴 提交于 2019-11-26 17:42:16
Shortly, I want to create composite keys on my table remaining with the primary key in order to improve sql server search performance. The performance issue occurs on 200k data table whenever I search an entity without primary key (i.e a string of GUID). Assume that I have 3 classes public class Device{ public int ID { get; set; } public string UDID { get; set; } public string ApplicationKey { get; set; } public string PlatformKey { get; set; } public ICollection<NotificationMessageDevice> DeviceMessages { get; set; } } public class NotificationMessageDevice { [Column(Order = 0), Key,

@OneToMany and composite primary keys?

由 青春壹個敷衍的年華 提交于 2019-11-26 17:37:29
问题 I'm using Hibernate with annotations (in spring), and I have an object which has an ordered, many-to-one relationship which a child object which has a composite primary key, one component of which is a foreign key back to the id of the parent object. The structure looks something like this: +=============+ +================+ | ParentObj | | ObjectChild | +-------------+ 1 0..* +----------------+ | id (pk) |-----------------| parentId | | ... | | name | +=============+ | pos | | ... | +=======

Defining Composite Key with Auto Increment in MySQL

由 时间秒杀一切 提交于 2019-11-26 17:36:50
问题 Scenario: I have a table which references two foreign keys, and for each unique combination of these foreign keys, has its own auto_increment column. I need to implement a Composite Key that will help identify the row as unique using combination of these three (one foreign keys and one auto_increment column, and one other column with non-unique values) Table: CREATE TABLE `issue_log` ( `sr_no` INT NOT NULL AUTO_INCREMENT , `app_id` INT NOT NULL , `test_id` INT NOT NULL , `issue_name` VARCHAR

composite key as foreign key

由 回眸只為那壹抹淺笑 提交于 2019-11-26 15:07:13
I am using Entity framework 4.1 in MVC 3 application. I have an entity where I have primary key consists of two columns ( composite key). And this is being used in another entity as foreign key. How to create the relationship ? In normal scnerios we use : public class Category { public string CategoryId { get; set; } public string Name { get; set; } public virtual ICollection<Product> Products { get; set; } } public class Product { public int ProductId { get; set; } public string Name { get; set; } public string CategoryId { get; set; } public virtual Category Category { get; set; } } but what

Composite Primary Key performance drawback in MySQL

由 心已入冬 提交于 2019-11-26 10:42:42
问题 We have a table with a composite Primary key consisting of three fields (and it is in MySQL 5.1). There are near 200 inserts and 200 selects per second on this table, and the size of the table is around 1 million rows and it is increasing. My question is: does the \"Composite Primary Key\" decrease the performance of the Inserts and Selects on this table? Should I be using a simple Auto-Increasing INT ID field instead of a Composite Primary Key? (I think the answer is very much related to the

Composite Key with EF 4.1 Code First

由 眉间皱痕 提交于 2019-11-26 10:20:28
问题 I am trying to figure out how to have a composite key using EF code First 4.1 RC. Currently, I am using the [Key] Data Annotation, but I am unable to specify more than one key. how would one specify a composite key? Here is my Example: public class ActivityType { [Key] public int ActivityID { get; set; } [Required(ErrorMessage = \"A ActivityName is required\")] [StringLength(50, ErrorMessage = \"Activity Name must not exceed 50 characters\")] public string ActivityName { get; set; } } I need

composite key as foreign key

由 不想你离开。 提交于 2019-11-26 04:09:40
问题 I am using Entity framework 4.1 in MVC 3 application. I have an entity where I have primary key consists of two columns ( composite key). And this is being used in another entity as foreign key. How to create the relationship ? In normal scnerios we use : public class Category { public string CategoryId { get; set; } public string Name { get; set; } public virtual ICollection<Product> Products { get; set; } } public class Product { public int ProductId { get; set; } public string Name { get;

How to properly create composite primary keys - MYSQL

由 ≡放荡痞女 提交于 2019-11-26 01:37:14
问题 Here is a gross oversimplification of an intense setup I am working with. table_1 and table_2 both have auto-increment surrogate primary keys as the ID. info is a table that contains information about both table_1 and table_2 . table_1 (id, field) table_2 (id, field, field) info ( ???, field) I am trying to decided if I should make the primary key of info a composite of the IDs from table_1 and table_2 . If I were to do this, which of these makes most sense? ( in this example I am combining

How to map a composite key with Hibernate?

由 旧巷老猫 提交于 2019-11-25 23:24:19
问题 In this code, how to generate a Java class for the composite key (how to composite key in hibernate): create table Time ( levelStation int(15) not null, src varchar(100) not null, dst varchar(100) not null, distance int(15) not null, price int(15) not null, confPathID int(15) not null, constraint ConfPath_fk foreign key(confPathID) references ConfPath(confPathID), primary key (levelStation, confPathID) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; 回答1: To map a composite key, you can use the
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