hibernate for beginners

/*Test. Java:Compile and run the command line: (replace the red font with your own path)C:/j2sdk/bin/javac-classpath "E:/hibernate-2.1.2/hibernate-2.1/hibernate2.jar; E: /hibernate-2.1.2/hibernate-2.1/lib/ant-1.5.3.jar; E:/hibernate-2.1.2/

What is Hibernate?Hibernate is a ormapping frameHibernate is an operational framework for manipulating databasesWhy to use HIBERNATEJDBC's disadvantage1, the code is quite cumbersome2, moving from one database to another database, you have to change a lot of content, poor3. See:When making a request, it is possible to extract the data directly from memory, a process called a data cacheAlthough JDBC provides

Hibernate framework Study Notes 6: transactions, hibernate Study Notes MySQL transactions and JDBC transaction operations: For details, see this article: More detailed Http://www.cnblogs.com/xuyiqing/p/8430214.html How to configure the isolation level in hibernate: In the core configuration file: Here it is binary, which is converted to decimal 1, 2, 4, 8 Man

(The Hibernate learning Note series comes from "Crazy Java" video learning)Hibernate overview免费开源Java包，可以使程序和数据库的交互变得容易，并更加符合面向对象的设计。持久化：将数据保存到数据库中Hibernate Persistence class Steps Environment construction Import the jar package, in the \lib\required folder in the Hibernate package Importing the J

------------I do not have him, but the hand is ripe, humble and foolish, and eager to be hungry-------------for the friends who have learned the ORM framework, the hibernateorm, familiar with a little strange, familiar is nothing but the soul, unfamiliar is just some language1.1: hibernate-orm Introduction 1.Hibernate is an object-relational mapping framework (ORM)that develops source code;2. The lightweig

Hibernate second-level cache configuration exception, hibernate second-level cache 1. java. lang. ExceptionInInitializerErrorAt sun. reflect. nativeConstructorAccessorImpl. newInstance0 (Native Method) at sun. reflect. nativeConstructorAccessorImpl. newInstance (nativeconstructeffeccessorimpl. java: 39) at sun. reflect. delegatingConstructorAccessorImpl. newInstance (delegatingconstructextends cess

Hibernate principle, configuration and single table operations, hibernate single table 1. Hibernate configuration document Hbm2ddl. "create" in auto indicates that the original table will be deleted every time data is modified, and a new table structure will be generated. The original data will no longer exist. "update" indicates that the original

Hibernate Study Notes (1) --- Quick Start and preparation of hibernate,Persistence Layer: stores data in memory on disks and other storage devices. Persistent Object: refers to the business object that has been stored in the database with disk protection. The classic software application architecture (three-tier structure) In the three-tier structure, because the business logic is not only responsible fo

Talking about Hibernate n + 1, talking about hibernate The Session cache stores the correlated object graphs. By default, when Hibernate loads the Customer object from the database, it loads all associated Order objects at the same time. Take the Customer and Order classes as an example. Assume that the foreign key CUSTOMER_ID of the ORDERS table can be null. Bel

Today to write the content is not much, this is going to hibernate to set the operation of the content directly boils down to an article, but think about, or separate write better, after all, the front has been released, nonsense not to say, start it! Still create a new Studentlist.java entity class, the other properties are unchanged, just change the hobby property from the Set collection type to the list collection type, or paste the code out,

Basic knowledge: In Java, the types that represent time and date include: java. util. date and java. util. calendar. in addition, three java extensions are provided in the jdbc api. util. subclass of the Date class: java. SQL. date, java. SQL. time and java. SQL. timestamp, which corresponds to the DATE, TIME, and TIMESTAMP types in the standard SQL type respectively. In standard SQL, the DATE type indicates the DATE, the TIME type indicates the TIME, and the TIMESTAMP type indicates the TIME st

First, hibernate architecture　　Second, Hibernate-api detailed 　　 2.1. Configuration ObjectConfiguration is used to load the config file.Our hibernate mainly has two configuration files, the first one is the core configuration file, the second is the mapping file.　　　　 　　 2.2. Sessionfactory FactorySessionfactory is equivalent to the Java Web Connection pool for ma

Hibernate-mapping (1) cascade deletion and hibernate cascade Deletion Hibernate acts as the data access layer. It uses the configuration file (hibernate. properties or hibernate. cfg. xml) and ing files (***. hbm. xml) maps a JAVA object or PO (PersistentObject, persistence

Manually install Hibernate tools for Eclipse (Hibernate reverse engineering)People who have used MyEclipse know that MyEclipse has integrated a hibernate can automatically generate mapping mappings based on database tables (XMLor annotation) and Java's Pojo class tools. In fact, Hibernate official website has to provid

Cache :If hibernate is used in a clustered environment (the cluster has node A, Node B) when requested, a node is sent to a, a record is modified in the database, and then the cache of Node B updates the new data modified by node A in real time.Hibernate's own first-level cache does not span processes, requires third-party cache support, and Ehcache caches can be implementedHibernate cache: 　　First-level caching:In the same session, the first time the

To establish a connection to the database with Hibernate, prepare the following: 1. Create an entity class: An entity class (also called a persisted Class) is a JavaBean class with some attributes, and the entity class accesses the property by using the standard JavaBean naming convention (Getterand setter method) while setting the access level of the class property to private. In order to instantiate the object of the class through the reflection mec

the configuration file.The second is to use the Hibernate.cfg.xml file as the configuration file.The third is to create a configuration object in a coded manner without using any of the config files.Note:the only purpose of the configuration object is to create an sessionfactory instance, so it is designed to be the startup object, and once the Sessionfactory object is created, it is discarded. 1. Using hibernateproperties as the configuration fileFor hibernate.properties as a configuration fil

Hibernate is very simple to use, and when we introduce the Hibernate framework into a Java project, we can manipulate the relational database in an object-oriented manner.Download:Log on to hibernate website, download hibernate tarball, download. zip package for Windows platform, download. Tar package for Linux platfor

It took a day to test the attributes of batch-size and hibernate. JDBC. batch_size. First, let's talk about the attribute hibernate. JDBC. batch_size. The cucutebatch () method... submits several SQL statements together to improve the performance. hibernate. JDBC. batch_size is set in hibernate. cfg. xml. Batch import

Hibernate Association ing and hibernate AssociationThis document serves as a learning note for the hibernate course for Ma soldiers at Beijing shangxue.com.Hibernate ing is mainly divided into one-to-one, one-to-many, one-to-one, and many-to-many. At the same time, it must be one-way and two-way.OK. Don't worry about the name. Let's look at the example.One-to-one