constraints
SQL defaults - best practice?
What is the best thing to do in the CREATE and UPDATE stored procedures for a table with default constraints?[详细]
2023-03-19 22:54 分类:问答How to ignore MaxLength constraint on an ADO.NET Datatable.DataColumn when loading data
A recurring problem in my experience when using Datasets and DataTables is that changing the database schema after the Dataset is compiled and released will cause constraint checking to fail. Of cours[详细]
2023-03-19 15:48 分类:问答How do I specify a pattern constraint using JAXB annotations?
I\'m developing a SOAP application using JAX-WS and JAXB. I\'d like to specify a pattern constraint for one of the fields (a Dutch postcode, 开发者_开发百科\\d{4}[A-Z]{2}). That\'s very easy to do usi[详细]
2023-03-19 01:53 分类:问答Can an SQL constraint be used to prevent a particular value being changed when a condition holds?
I know that SQL constraints can force data to meet validity criteria. However, what about criteria such as \"Student\'s grade can only be updated when the \'finalised\' flag is false\"? Do such update[详细]
2023-03-18 22:19 分类:问答Certificates Basic Constraint's Path Length
Is having a Path Length of 0 and None the same thing for Basic Constraint开发者_运维百科\'s of a CA type? To clarify, does a path length of 0mean that the CA can issue no certificates while a path len[详细]
2023-03-18 22:18 分类:问答Generic Type Constraint to accept only Numbers? [duplicate]
This question already has answers here: 开发者_开发百科 Closed 11 years ago. Possible Duplicates:[详细]
2023-03-18 04:42 分类:问答Hibernate annotation Cascade problem
I have a Java class that contains a list of another class. @Entity public class Country { private Long id;[详细]
2023-03-18 03:40 分类:问答JPA: Partial contraint
I need something like a partial contraint for one of my entities. @Entity public class MyEntity { @NotNull[详细]
2023-03-17 15:22 分类:问答Why doesn't an interface work but an abstract class does with a generic class constraint?
The code below shows a generic class with a type constraint (Pub<T>). The class has an event that it can raise allowing us to pass a message to subscribers. The constraint is that the message mu[详细]
2023-03-16 07:11 分类:问答prevent duplicate entries by matching a subset of fields
I have an insert statement that inserts 开发者_StackOverflow中文版tags into a table. Each tag has a unique id (for referencing), a vid_id (for matching to a video), and a name (ex. tag1).[详细]
2023-03-16 04:56 分类:问答