query database first!
mysql> select * from product; +----+--------+----------+ | id | name | qq | +----+--------+----------+ | 1 | apple | 20121212 | | 2 | orange | 20111111 | | 3 | banana | 20122222 | | 4 | apple | 20122222 | | 5 | apple | 20122222 | | 6 | apple | 201222qq | +----+--------+----------+ 6 rows in set (0.00 sec) mysql>
【1、HQL查询】：
hibernate管理类！
package com.bubble.util;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
/**
* @author bubble
*
*/
public class HibernateUtil {
// single
private static final SessionFactory sessionFactory;
static{
try{
//class AnnotationConfiguration:读取关于Annotation的配置
sessionFactory=new AnnotationConfiguration().configure().buildSessionFactory();
}catch (Throwable e) {
// TODO: handle exception
throw new ExceptionInInitializerError(e);
}
}
// static method to get session
public static Session getSession() throws HibernateException{
return sessionFactory.openSession();
}
// close session factory
public static void closeSessionFactory(){
sessionFactory.close();
}
}
测试HQL查询方式的代码！
package com.bubble.test;
import java.util.List;
import org.hibernate.Query;
import org.hibernate.Session;
import com.bubble.entity.Product;
import com.bubble.util.HibernateUtil;
public class HqlTest {
/**
* @author bubble 11 / 12 / 07
* HQL具有跨数据库的优点。
* 适用情况：常用方法，比较传统，类似jdbc。
* 缺点：新的查询语言，适用面有限，仅适用于Hibernate框架。
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Session session=HibernateUtil.getSession();// get session
//String hql="from Product as product where product.name= ? ";// hql
// same to the ? method
String hql="from Product as product where product.name=:name";// 命名参数
Query query = session.createQuery(hql); // create query object
// query.setString(0, "apple");// set the value of first ?
query.setString("name","apple");
List<Product> list=query.list();// get product if product's name=apple
for (Product product : list) {
// print product's info
System.out.println("name is:"+product.getName()+"\tQQ shenma is:"+product.getQq());
}
// close
session.close();
HibernateUtil.closeSessionFactory();
}
}
查询结果！
2011-12-7 1:46:54 org.hibernate.cfg.annotations.Version <clinit>
信息: Hibernate Annotations 3.3.0.GA
2011-12-7 1:46:54 org.hibernate.cfg.Environment <clinit>
信息: Hibernate 3.2.5
2011-12-7 1:46:54 org.hibernate.cfg.Environment <clinit>
信息: hibernate.properties not found
2011-12-7 1:46:54 org.hibernate.cfg.Environment buildBytecodeProvider
信息: Bytecode provider name : cglib
2011-12-7 1:46:54 org.hibernate.cfg.Environment <clinit>
信息: using JDK 1.4 java.sql.Timestamp handling
2011-12-7 1:46:54 org.hibernate.cfg.Configuration configure
信息: configuring from resource: /hibernate.cfg.xml
2011-12-7 1:46:54 org.hibernate.cfg.Configuration getConfigurationInputStream
信息: Configuration resource: /hibernate.cfg.xml
2011-12-7 1:46:54 org.hibernate.cfg.Configuration doConfigure
信息: Configured SessionFactory: null
2011-12-7 1:46:54 org.hibernate.cfg.AnnotationBinder bindClass
信息: Binding entity from annotated class: com.bubble.entity.Product
2011-12-7 1:46:54 org.hibernate.cfg.annotations.EntityBinder bindTable
信息: Bind entity com.bubble.entity.Product on table Product
2011-12-7 1:46:54 org.hibernate.validator.Version <clinit>
信息: Hibernate Validator 3.0.0.GA
2011-12-7 1:46:55 org.hibernate.connection.DriverManagerConnectionProvider configure
信息: Using Hibernate built-in connection pool (not for production use!)
2011-12-7 1:46:55 org.hibernate.connection.DriverManagerConnectionProvider configure
信息: Hibernate connection pool size: 20
2011-12-7 1:46:55 org.hibernate.connection.DriverManagerConnectionProvider configure
信息: autocommit mode: false
2011-12-7 1:46:55 org.hibernate.connection.DriverManagerConnectionProvider configure
信息: using driver: com.mysql.jdbc.Driver at URL: jdbc:mysql://localhost:3306/hiber001
2011-12-7 1:46:55 org.hibernate.connection.DriverManagerConnectionProvider configure
信息: connection properties: {user=root, password=****}
2011-12-7 1:46:55 org.hibernate.cfg.SettingsFactory buildSettings
信息: RDBMS: MySQL, version: 5.1.45-community-log
2011-12-7 1:46:55 org.hibernate.cfg.SettingsFactory buildSettings
信息: JDBC driver: MySQL-AB JDBC Driver, version: mysql-connector-java-5.1.13 ( Revision: ${bzr.revision-id} )
2011-12-7 1:46:55 org.hibernate.dialect.Dialect <init>
信息: Using dialect: org.hibernate.dialect.MySQLDialect
2011-12-7 1:46:55 org.hibernate.transaction.TransactionFactoryFactory buildTransactionFactory
信息: Using default transaction strategy (direct JDBC transactions)
2011-12-7 1:46:55 org.hibernate.transaction.TransactionManagerLookupFactory getTransactionManagerLookup
信息: No TransactionManagerLookup configured (in JTA environment, use of read-write or transactional second-level cache is not recommended)
2011-12-7 1:46:55 org.hibernate.cfg.SettingsFactory buildSettings
信息: Automatic flush during beforeCompletion(): disabled
2011-12-7 1:46:55 org.hibernate.cfg.SettingsFactory buildSettings
信息: Automatic session close at end of transaction: disabled
2011-12-7 1:46:55 org.hibernate.cfg.SettingsFactory buildSettings
信息: JDBC batch size: 15
2011-12-7 1:46:55 org.hibernate.cfg.SettingsFactory buildSettings
信息: JDBC batch updates for versioned data: disabled
2011-12-7 1:46:55 org.hibernate.cfg.SettingsFactory buildSettings
信息: Scrollable result sets: enabled
2011-12-7 1:46:55 org.hibernate.cfg.SettingsFactory buildSettings
信息: JDBC3 getGeneratedKeys(): enabled
2011-12-7 1:46:55 org.hibernate.cfg.SettingsFactory buildSettings
信息: Connection release mode: auto
2011-12-7 1:46:55 org.hibernate.cfg.SettingsFactory buildSettings
信息: Maximum outer join fetch depth: 2
2011-12-7 1:46:55 org.hibernate.cfg.SettingsFactory buildSettings
信息: Default batch fetch size: 1
2011-12-7 1:46:55 org.hibernate.cfg.SettingsFactory buildSettings
信息: Generate SQL with comments: disabled
2011-12-7 1:46:55 org.hibernate.cfg.SettingsFactory buildSettings
信息: Order SQL updates by primary key: disabled
2011-12-7 1:46:55 org.hibernate.cfg.SettingsFactory buildSettings
信息: Order SQL inserts for batching: disabled
2011-12-7 1:46:55 org.hibernate.cfg.SettingsFactory createQueryTranslatorFactory
信息: Query translator: org.hibernate.hql.ast.ASTQueryTranslatorFactory
2011-12-7 1:46:55 org.hibernate.hql.ast.ASTQueryTranslatorFactory <init>
信息: Using ASTQueryTranslatorFactory
2011-12-7 1:46:55 org.hibernate.cfg.SettingsFactory buildSettings
信息: Query language substitutions: {}
2011-12-7 1:46:55 org.hibernate.cfg.SettingsFactory buildSettings
信息: JPA-QL strict compliance: disabled
2011-12-7 1:46:55 org.hibernate.cfg.SettingsFactory buildSettings
信息: Second-level cache: enabled
2011-12-7 1:46:55 org.hibernate.cfg.SettingsFactory buildSettings
信息: Query cache: disabled
2011-12-7 1:46:55 org.hibernate.cfg.SettingsFactory createCacheProvider
信息: Cache provider: org.hibernate.cache.NoCacheProvider
2011-12-7 1:46:55 org.hibernate.cfg.SettingsFactory buildSettings
信息: Optimize cache for minimal puts: disabled
2011-12-7 1:46:55 org.hibernate.cfg.SettingsFactory buildSettings
信息: Structured second-level cache entries: disabled
2011-12-7 1:46:55 org.hibernate.cfg.SettingsFactory buildSettings
信息: Echoing all SQL to stdout
2011-12-7 1:46:55 org.hibernate.cfg.SettingsFactory buildSettings
信息: Statistics: disabled
2011-12-7 1:46:55 org.hibernate.cfg.SettingsFactory buildSettings
信息: Deleted entity synthetic identifier rollback: disabled
2011-12-7 1:46:55 org.hibernate.cfg.SettingsFactory buildSettings
信息: Default entity-mode: pojo
2011-12-7 1:46:55 org.hibernate.cfg.SettingsFactory buildSettings
信息: Named query checking : enabled
2011-12-7 1:46:55 org.hibernate.impl.SessionFactoryImpl <init>
信息: building session factory
2011-12-7 1:46:55 org.hibernate.impl.SessionFactoryObjectFactory addInstance
信息: Not binding factory to JNDI, no JNDI name configured
Hibernate: select product0_.id as id0_, product0_.name as name0_, product0_.qq as qq0_ from Product product0_ where product0_.name=?
name is:apple QQ shenma is:20121212
name is:apple QQ shenma is:20122222
name is:apple QQ shenma is:20122222
name is:apple QQ shenma is:201222qq
2011-12-7 1:46:55 org.hibernate.impl.SessionFactoryImpl close
信息: closing
2011-12-7 1:46:55 org.hibernate.connection.DriverManagerConnectionProvider close
信息: cleaning up connection pool: jdbc:mysql://localhost:3306/hiber001
-------------------------------------------------------------------------------------------------------------------------------
【2、对象化查询Criteria方法】：
Criteria查询代码！
package com.bubble.test;
import java.util.List;
import org.hibernate.Criteria;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.criterion.Restrictions;
import com.bubble.entity.Product;
import com.bubble.util.HibernateUtil;
public class CriteriaTest {
/**
* @author bubble 11 / 12 / 07
* 适用情况：面向对象操作，革新了以前的数据库操作方式，易读。
* 缺点：适用面较HQL有限。
*
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Session session=HibernateUtil.getSession();// get session
Criteria criteria = session.createCriteria(Product.class);
criteria.add(Restrictions.eq("name", "apple"));// Restrictions:get product's name which eq apple ,like the where Restrictions in hql
//eq是等于，gt是大于，lt是小于,or是或
criteria.add(Restrictions.gt("id", 3)); // when id > 3
List<Product> list=criteria.list();// get product if product's name=apple and id>3
for (Product product : list) {
// print product's info
System.out.println("name is:"+product.getName()+"\tQQ shenma is:"+product.getQq());
}
// close
session.close();
HibernateUtil.closeSessionFactory();
}
}
查询结果！
Hibernate: select this_.id as id0_0_, this_.name as name0_0_, this_.qq as qq0_0_ from Product this_ where this_.name=? and this_.id>? name is:apple QQ shenma is:20122222 name is:apple QQ shenma is:20122222 name is:apple QQ shenma is:201222qq
-------------------------------------------------------------------------------------------
【3、动态分离查询DetachedCriteria】
detachedcriteria查询方式代码！
package com.bubble.test;
import java.util.List;
import org.hibernate.Criteria;
import org.hibernate.Session;
import org.hibernate.criterion.DetachedCriteria;
import org.hibernate.criterion.Restrictions;
import com.bubble.entity.Product;
import com.bubble.util.HibernateUtil;
/**
* @author bubble 11 / 12 / 07
* 适用情况：面向对象操作，分离业务与底层，不需要字段属性摄入到Dao实现层。
* 缺点：适用面较HQL有限。
*/
public class DetachedCriteriaTest {
// get result from database ,return list
public static List dc(DetachedCriteria dc) {
Session session = HibernateUtil.getSession();
Criteria c = dc.getExecutableCriteria(session);
List<Criteria> list = c.list();
session.close();
return list;
}
// main method
public static void main(String[] args) {
DetachedCriteria dc = DetachedCriteria.forClass(Product.class);
int id = 1;
String name = "apple";
if (id != 0)
dc.add(Restrictions.gt("id", id));
if (name != null)
dc.add(Restrictions.eq("name", name));
List<Product> list = dc(dc);
System.out.println("离线查询返回结果：--------------------");
for (Product product : list) {
// print product's info
System.out.println("name is:" + product.getName()
+ "\tQQ shenma is:" + product.getQq());
}
}
}
结果！
Hibernate: select this_.id as id0_0_, this_.name as name0_0_, this_.qq as qq0_0_ from Product this_ where this_.id>? and this_.name=? 离线查询返回结果：-------------------- name is:apple QQ shenma is:20122222 name is:apple QQ shenma is:20122222 name is:apple QQ shenma is:201222qq
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【4、例子查询】
例子查询代码！
package com.bubble.test;
import java.util.List;
import org.hibernate.Session;
import org.hibernate.criterion.Example;
import com.bubble.entity.Product;
import com.bubble.util.HibernateUtil;
/**
* @author bubble 11 / 12 / 07
* 适用情况：面向对象操作。
* 缺点：适用面较HQL有限，不推荐。
*/
public class ExampleTest {
public static void main(String[] args) {
// TODO Auto-generated method stub
Session session=HibernateUtil.getSession();// get session
List<Product> products = session.createCriteria(Product.class).add(Example.create(new Product())).list();
for (Product product : products) {
// print product's info
System.out.println("name is:" + product.getName()
+ "\tQQ shenma is:" + product.getQq());
}
// close
session.close();
HibernateUtil.closeSessionFactory();
}
}
查询结果！
Hibernate: select this_.id as id0_0_, this_.name as name0_0_, this_.qq as qq0_0_ from Product this_ where (1=1) name is:apple QQ shenma is:20121212 name is:orange QQ shenma is:20111111 name is:banana QQ shenma is:20122222 name is:apple QQ shenma is:20122222 name is:apple QQ shenma is:20122222 name is:apple QQ shenma is:201222qq
【5、sql查询】
sql查询代码！
package com.bubble.test;
import java.util.List;
import org.hibernate.Query;
import org.hibernate.Session;
import com.bubble.entity.Product;
import com.bubble.util.HibernateUtil;
/**
* @author bubble 11 / 12 / 07
* 适用情况：不熟悉HQL的朋友，又不打算转数据库平台的朋友，万能方法
* 缺点：破坏跨平台，不易维护，不面向对象。
*/
public class SqlTest {
public static void main(String[] args) {
// TODO Auto-generated method stub
Session session=HibernateUtil.getSession();// get session
Query query = session.createSQLQuery("select * from product").addEntity(Product.class);// create sql statement
List<Product> list=query.list();// get all products
for (Product product : list) {
// print product's info
System.out.println("name is:"+product.getName()+"\tid is:"+product.getId());
}
// close
session.close();
HibernateUtil.closeSessionFactory();
}
}
结果！
Hibernate: select * from product name is:apple id is:1 name is:orange id is:2 name is:banana id is:3 name is:apple id is:4 name is:apple id is:5 name is:apple id is:6
-----------------------------------------------------------------------------------------------------------
【6、命名查询】
之前是使用hibernate注解来进行映射的，现在注释掉注解映射
hibernate.cfg.xml
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<!-- Generated by MyEclipse Hibernate Tools. -->
<hibernate-configuration>
<session-factory>
<property name="dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name="connection.url">
jdbc:mysql://localhost:3306/hiber001
</property>
<property name="connection.username">root</property>
<property name="connection.password">123456</property>
<property name="connection.driver_class">
com.mysql.jdbc.Driver
</property>
<property name="myeclipse.connection.profile">mysql5</property>
<property name="show_sql">true</property>
<!-- annotation part -->
<!-- <mapping class="com.bubble.entity.Product" /> -->
<mapping resource="com/bubble/entity/Product.hbm.xml" />
</session-factory>
</hibernate-configuration>
命名查询代码！
package com.bubble.test;
/**
* @author bubble 11 / 12 / 07
* 适用情况：万能方法，有点像ibatis轻量级框架的操作，方便维护。
* 缺点：不面向对象。基于hql和sql，有一定缺陷
*/
import java.util.List;
import org.hibernate.Query;
import org.hibernate.Session;
import com.bubble.entity.Product;
import com.bubble.util.HibernateUtil;
public class NamedTest {
public static void main(String[] args) {
// TODO Auto-generated method stub
Session session=HibernateUtil.getSession();// get session
Query query = session.getNamedQuery("getProductByName");
query.setString("name","apple");
List<Product> list=query.list();// get all products named apple
for (Product product : list) {
// print product's info
System.out.println("name is:"+product.getName()+"\tid is:"+product.getId());
}
// close
session.close();
HibernateUtil.closeSessionFactory();
}
}
查询结果！
Hibernate: select product0_.id as id0_, product0_.name as name0_, product0_.qq as qq0_ from hiber001.product product0_ where product0_.name=? name is:apple id is:1 name is:apple id is:4 name is:apple id is:5 name is:apple id is:6
okay！that's all!
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谢谢~~欢迎交流！
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