Suppose I have two entities, a post and a comment (in ColdFusion):
component persistent=” true” table=”post”
{
property name=”Id” fieldtype=”id”;
property name=”Comments” fieldtype=”one-to-
Category: Hibernate
Hibernate is an open source object-relational mapping framework. It encapsulates JDBC very lightweight objects. It establishes a mapping relationship between POJOs and database tables. It is a fully automatic orm framework. Hibernate can automatically generate SQL statements. Automatic execution allows Java programmers to use object programming thinking to manipulate the database as they like. Hibernate can be used in any occasion where JDBC is used, either in Java client programs or in Servlet/JSP Web applications. The most revolutionary thing is that Hibernate can replace CMP in the J2EE architecture using EJB. , To complete the important task of data persistence.
What is the problem with NHIBERNATE solves?
I have seen some jobs that require nhibernate knowledge, and a large number of problems on the stack. I found another problem, pointing to Summer Of NHibernate, and now I am watching the video. But
Hibernate uses @Dynamicinsert and @Dynamicupdate to generate dynamic SQL statements
In using Hibernate4 recently, I found two very mysterious annotations @DynamicInsert and @DynamicUpdate
If it is in the configuration file That is, dynamic-insert and dynamic-update
The
Hibernate – Desire to get the entire object tree in Grails
So I have some objects in the domain, and they have a hasMany relationship, as shown below
Class Car {
String name
SortedSet tires = [] as SortedSet
static hasMany = [tires: Tire]
}
Class
GRAILS default Hibernate cache configuration
The Grails 2.0.0 reference manual shows the following as the default Hibernate cache configuration
hibernate {
cache.use_second_level_cache=true
cache.use_query_cache=true
cache.provider_c
Hibernate: How to use a comment to specify a custom sequence generator class name?
I want to use comments to specify the following hbm configuration:
I don’t know how to provide the class name< /p>
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator=”SEQ_STORE
Hibernate – avoids cross-table external connections when connecting inherited using the Spring Data JPA connection
Consider the following classes in a Spring Data JPA (Hibernate) application:
@Entity
@Inheritance (strategy = InheritanceType.JOINED)
@Table(name = “person”)
public class Person {}
@Entity
@T
NHibernate mapping system.type
When I map an entity with a System.Type type attribute, I know that NHibernate maps this to DbType.String, saves the assembly qualified name, and I can see that in the table, the type The column co
Hibernate 4.1.2 hhh000342: Unable to get a connection with query metadata: No drivers suitable for JDBC: HSQLDB: MEM: TEST
What did I do wrong?
My persistence.xml
org.hibernate.ejb.HibernatePersistence
User
My code
…
Persistence.cre
NHibernate stateless session – What is the data alias?
NHibernate documents applicable to stateless session interface states, including:
Stateless sessions are vulnerable to < strong>data aliasing effects, due to the
lack of a first-level cache.