Hibernate-orm:01.hibernate Huangrugeshi like

------------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 language 1.1: hibernate-orm Introduction

1.Hibernate is an object-relational mapping framework (ORM)that develops source code;

2. The lightweight encapsulation of JDBC enables the mapping of entity classes and tables in the database ;

3. is a fully automatic ORM framework;Hibernate can generate SQL statements automatically ;

4. The program Ape can operate the database completely according to the object-oriented programming idea .

Hibernate ORM: The subject of our research;

Hibernate Search: similar to lucence Full-Text Search

Hibernate Validator: validation Framework

Hibernate OGM: Operations for Nosql databases

1.2: Core configuration file hibernate.cfg.xml

<?xml version= "1.0" encoding= "UTF-8"?>
<! DOCTYPE hibernate-configuration Public
"-//hibernate/hibernate Configuration DTD 3.0//en"
"Http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd" >

Important content in the configuration file that needs our configuration:

a four-factor connection to a database

To manage various hbm.xml mapping files

the settings of the cache .

The SQL statement is displayed

Whether to format SQL statements

configuration of the 06.HBM2DDL

1.2: Core API 1. Configuration class the MyBatis of the "----------------" corresponds to Sqlsessionfactorybuilder

load Hibernate 's core configuration file, and be responsible for starting hibernate, creating sessionfactory Objects

2. sessionfactory Interface the MyBatis of the "----------------" corresponds to Sqlsessionfactory

Initialize Hibernate, which is the proxy for the data storage source, is responsible for creating the Session Object!

in a project we use a Sessionfactory is enough!

if we need to operate multiple databases, establish each database to specify a Sessionfactory!

3. Session Interface----------------"corresponds to the sqlsession of MyBatis

responsible for executing persisted objects. CRUD Operations! The thread is unsafe! can open a transaction! Create a Transaction Object!

Session ===> Sessions

HttpSession ===> User session

4. Transaction Interface

Operations for Transactions!

5. Query Interface

To facilitate our query of database data, there are two ways to implement the query:

01.sql

02.hql

6. Criteria Interface

Very similar to the query interface! Completely object-oriented thinking to operate the database!

Hibernate-orm:01.hibernate Huangrugeshi like