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Hibernate Annotation �W�记

Tue, 12 Oct 2010 08:52:00 GMT

1.@Entity 标识实体
2.@Table (name = "tableName") //指定物理�?br />
@Table(name="tbl_sky",
    uniqueConstraints = {@UniqueConstraint(columnNames={"month", "day"})}//唯一性约�?br /> )

3.@Embeddable 被声明的�c�d��以嵌入其他实体中
public class Address {
   private String street1;//persistent
   public String getStreet1() { return street1; }
   public void setStreet1() { this.street1 = street1; }
   private hashCode; //not persistent
}
@Embedded 在实体中嵌入一个类型：常用的像名字�Q�地址之类�?br /> 另，使用@AttributeOverrides标识覆盖原类中的属性取��|��因�ؓ原实体可能引用的是其他字�D�c�?br /> @Embedded
    @AttributeOverrides( {
            @AttributeOverride(name="iso2", column = @Column(name="bornIso2") ),
            @AttributeOverride(name="name", column = @Column(name="bornCountryName") )
    } )
Country bornIn;

例子�Q?br /> @Entity

class User {
@EmbeddedId
@AttributeOverride(name="firstName", column=@Column(name="fld_firstname")
UserId id;
Integer age;
}
@Embeddable
class UserId implements Serializable {//此处Serializable是必��ȝ��
String firstName;
String lastName;
}

4.@Access(AcessType.PROPERTY)
必须定义getter/setter�Ҏ��才能实现持久�?br /> �q�有另一�U�取��|��AcessType.FILED,可以不定义getter/setter�Ҏ��Q�也能实现持久化
此annotation也可以定义字�D�c�?br />
5.主键�Q?br />    A.单键
    @Id
    @GeneratedValue (generator = "identity")
    @GenericGenerator (name = "identity", strategy = "identity")
    或�?br />     @javax.persistence.SequenceGenerator(
    name="SEQ_STORE",
    sequenceName="my_sequence")
    @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="SEQ_STORE")
    其中�Q?br />      strategy取��gؓ:
     AUTO - either identity column, sequence or table depending on the underlying DB
     TABLE - table holding the id
     IDENTITY - identity column
     SEQUENCE - sequence
   B.复合�l�键
    @Entity
class Customer {
@EmbeddedId CustomerId id;
boolean preferredCustomer;
@MapsId("userId")//user.id与customerId.userId 使用相同的�?br /> @JoinColumns({
    @JoinColumn(name="userfirstname_fk", referencedColumnName="firstName"),
    @JoinColumn(name="userlastname_fk", referencedColumnName="lastName")
})
@OneToOne User user;
}

@Embeddable
class CustomerId implements Serializable {
UserId userId;
String customerNumber;
}

@Entity
class User {
@EmbeddedId UserId id;
Integer age;
}

@Embeddable
class UserId implements Serializable {
String firstName;
String lastName;
}


6.字段讄��Q?br /> @Column(
    name="columnName";
    boolean un(2)ique() default false;
    boolean nu(3)llable() default true;
    boolean in(4)sertable() default true;
    boolean up(5)datable() default true;
    String col(6)umnDefinition() default "";
    String tab(7)le() default "";
    int length(8)() default 255;
    int precis(9)ion() default 0; // decimal precision
    int scale((10)) default 0; // decimal scale
@Transient 非持久化字段
@Basic 持久化字�D?br /> @Basic(fetch = FetchType.LAZY) basic 用于定义property的fetch属�?br /> @Enumerated(EnumType.STRING) 标识enum persisted as String in database
@Lob blob clob字段
@Formula("obj_length * obj_height * obj_width")//自定义输�?br /> public long getObjectVolume()

7.Mapping关系
A.一对多或者一对一�Q?br /> @OneToOne(cascade = CascadeType.ALL) 一对一关系�Q��联关�p�Mؓall
@PrimaryKeyJoinColumn或�?br /> 指定兌��外键
@JoinColumn(name="passport_fk")
Passport passport�Q?br /> 一对一的另一端只需@OneToOne(mappedBy = "passport")�Q�passport为前一个实体声明的名字

@OneToMany(fetch = FetchType.LAZY , mappedBy = "adProduct")
@Cascade(value = {CascadeType.ALL,CascadeType.DELETE_ORPHAN})

@OrderBy(value = "id") //排序
B.多对一�Q?br />     @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name="adPosition_id",nullable=false)


8.Fetch and Lazy

Annotations	Lazy	Fetch
@[One\|Many]ToOne](fetch=FetchType.LAZY)	@LazyToOne(PROXY)	@Fetch(SELECT)
@[One\|Many]ToOne](fetch=FetchType.EAGER)	@LazyToOne(FALSE)	@Fetch(JOIN)
@ManyTo[One\|Many](fetch=FetchType.LAZY)	@LazyCollection(TRUE)	@Fetch(SELECT)
@ManyTo[One\|Many](fetch=FetchType.EAGER)	@LazyCollection(FALSE)	@Fetch(JOIN)

9.Cascade

PERSIST
MERGE
REMOVE
REFRESH
DELETE
SAVE_UPDATE

10.�~�存

�~�存的注释写法如下，加在Entity的java�c�M��Q?br />

@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)

�~�存的方式有四种�Q�分别�ؓ�Q?/p>

CacheConcurrencyStrategy.NONE
CacheConcurrencyStrategy.READ_ONLY�Q�只��L��式，在此模式下，如果�Ҏ��据进行更新操作，会有异常�Q?
CacheConcurrencyStrategy.READ_WRITE�Q�读写模式在更新�~�存的时候会把缓存里面的数据换成一个锁�Q�其它事务如果去取相应的�~�存数据�Q�发现被锁了直接��去数据库查询；
CacheConcurrencyStrategy.NONSTRICT_READ_WRITE�Q�不严格的读写模式则不会对缓存数据加锁；
CacheConcurrencyStrategy.TRANSACTIONAL�Q�事务模式指�~�存支持事务�Q�当事务回滚�Ӟ��~�存也能回滚�Q�只支持JTA环境�?

11.No-Annotation 字段�Q?br />
      If the property is of a single type, it is mapped as @Basic

      Otherwise, if the type of the property is annotated as @Embeddable, it is mapped as @Embedded

      Otherwise, if the type of the property is Serializable, it is mapped as @Basic in a column holding the object in its serialized version

      Otherwise, if the type of the property is java.sql.Clob or java.sql.Blob, it is mapped as @Lob with the appropriate LobType

阮步�?/a> 2010-10-12 16:52 发表评论

Rule Engine之Drools

Sat, 25 Sep 2010 09:48:00 GMT

对于做��Y件的人来��_��唯一不变的就是变化。此��业真理。而对于复杂业务系�l�的逻辑�l��g的定义不得不多考虑一下业务的可扩展性，来应对客��L��变化。选择Rule Engine是一个不错的�Ҏ��?br />
Drools 是用 Java 语言�~�写的开放源码规则引擎。Drools 允许使用声明方式表达业务逻辑。可以��用非 XML 的本地语�a��~�写规则�Q�这点很重要�Q�本��Z��前曾用过自己公司的一套业务规则组�Ӟ��无论是编写还是调试都很麻烦）�Q�从而便于学习和理解。�ƈ且，�q�可以将 Java 代码直接嵌入到规则文件中�Q��Drools 更加吸引人。简单的概括�Q�就是简单��用，易于理解。而且它是免费的�?br />
1.rule文�g�Q?/strong>
rule "rule name"
    no-loop
    when
      customer : Customer( state == CustomerState.UNCENSORED )
    then
        customer.setState(CustomerState.AUDITING);
        CustomerTask task=new CustomerTask();
        Post law=userService.getPostByPostCode(Constants.PostCode.ROOT_LAW);
        task.setAuditorPost(law);
        task.setEntityState(CustomerState.AUDITING);
        task.setEntityId(customer.getId());
        task.setEntityCode(String.valueOf(customer.getId()));
        task.setEntityType(Customer.class.getSimpleName());
        task.setTitle(customer.getName()+" test");
        taskService.assignmentTask(task);
        logger.info("CustomerTask Submit auditorTitle:" + task.getAuditorTitle());
end

�q�里面有个状态的条�g判断state == CustomerState.UNCENSORED �Q�then 关键字后面的便是�W�合条�g的处理逻辑�Q�只要是java�E�度都可以看懂，比xml�cȝ��rule文�g好懂了许多�?br />
接下�?br /> 语法说明�Q?/strong>

文�g头部分：
package drools.java.demo;定义包名,�{�同于命名空�?br /> import drools.java.demo.Machine;导入java�c?br /> global java.util.List myGlobalList;此关键字让规则引擎知道，myGlobalList对象应该可以从规则中讉K��.
function:�c�M��于公用方法的抽象�Q�如下定义后�Q�各个同一文�g下的rule都可以��?br /> function void setTestsDueTime(Machine machine, int numberOfDays) {
    setDueTime(machine, Calendar.DATE, numberOfDays);
}

rule�Q�定义了一个规�?br />
rule ""
*
when
*
then
*
end

即rule的名字标�?br />
:

常用的属性：
no-loop �Q�true 条�g�l�果更改后，修改此条件且定义为no-loop:true的规则不会再重新执行�?br />
lock-on-active�Q�true 可以看作是no-loop的加强版�Q�当条�g�l�果更改后，不但修改此条件的规则不会重新执行�Q�文件中的�Q何规则（�?active-lock 属性被设�ؓ true�Q�不会重新执行�?/pre> salience�Q?00 使用它可以让规则执行引擎知道应该启动规则的结果语句的��序。具有最高显著值的规则的结果语句首先执行；��h��W�二高显著值的规则的结果语句第二执行，依此�c�L��。当您需要让规则按预定义��序启动�Ӟ��q�一炚w��帔R��要�?br />
其他属性的解释误��http://downloads.jboss.com/drools/docs/5.1.1.34858.FINAL/drools-expert/html_single/index.html#d0e2607

when:填写条�g的地方，比如�Q?br />
Cheese( type == "stilton", price < 10, age == "mature" )�?br />
Cheese( type == "stilton" && price < 10, age == "mature" )

then:业务规则的地方，略�?br />
2.用法

规则文�g定义好后�Q�就该是怎么使用它了

如上图，file rule定义好后�Q�就该是如何使用它了。最重要的两个类RuleBase和WorkingMemory

下面是一个example:
public class RulesEngine {
    private RuleBase rules;
    private boolean debug = false;
    public RulesEngine(String rulesFile) throws RulesEngineException {
        super();
        try {
            // Read in the rules source file
            Reader source = new InputStreamReader(RulesEngine.class
                    .getResourceAsStream("../../rules/" + rulesFile));

            // Use package builder to build up a rule package
            PackageBuilder builder = new PackageBuilder();

            // This will parse and compile in one step
            builder.addPackageFromDrl(source);

            // Get the compiled package
            Package pkg = builder.getPackage();

            // Add the package to a rulebase (deploy the rule package).
            rules = RuleBaseFactory.newRuleBase();
            rules.addPackage(pkg);

        } catch (Exception e) {
            throw new RulesEngineException(
                    "Could not load/compile rules file: " + rulesFile, e);
        }
    }
    public RulesEngine(String rulesFile, boolean debug)
            throws RulesEngineException {
        this(rulesFile);
        this.debug = debug;
    }
    public void executeRules(WorkingEnvironmentCallback callback) {
        WorkingMemory workingMemory = rules.newStatefulSession();
        if (debug) {
            workingMemory
                    .addEventListener(new DebugWorkingMemoryEventListener());
        }
        callback.initEnvironment(workingMemory);
        workingMemory.fireAllRules();
    }
}
RulesEngine构造方法演�C�Z��如何去读入一个rule文�g,�q�构��Z��一个RuleBase对象(RuleBase 是一个包含了rule文�g的所有规则的集合)
executeRules�Ҏ��定义了如何��用规则文件中定义的那些内容，用RuleBase构徏一个WorkingMemory对象�Q�再执行fireAllRules()�Ҏ��?br /> WorkingMemory 代表了与rulebase链接的session会话�Q�也可以看作是工作内存空间。如果你要向内存中插入一个对象可以调用insert()�Ҏ��,同理�Q�更��C��个对象��用update()�Ҏ��。WorkingMemory�q�有一个setGlobal()�Ҏ��Q�用来设�|�规则内可以引用的对�?相当于规则的全局变量)�?br />
3.��技�?/strong>

可以一�ơ把所有的rule文�g都蝲入内存中存放�Q�这样就不用每次执行都读取文件�?br /> 如果规则文�g被修改，也可以用�q�一个方法来判断是否需要重新蝲入rule文�g
比如�Q�根据文件的最后修�Ҏ��_��与内存中对应对象的时间做比较
public boolean hasChange(List ruleFileList){
        for(RuleFile ruleFile:ruleFileList){
            if(!ruleFile.getLastModifyTime().equals(ruleFileMap.get(ruleFile.getFileName()).getLastModifyTime())){
                return true;
            }
        }
        return false;
    }

注：具体的helloWorld 误��http://www.ibm.com/developerworks/cn/java/j-drools/#listing12�Q�比我说得好多了�?br />

阮步�?/a> 2010-09-25 17:48 发表评论

Wed, 01 Sep 2010 02:41:00 GMT

写在前面的话�Q�spring的监听事件模型应该是观察者模式。本人项目里的应用在process�Ҏ��按日期同步某个库的数据，在方法最后publish一个event事�g�Q�这个事件用于后�l�同步过来的数据处理。事件处理采用了spring的监听模�?�q�样可以做到process�Ҏ��与event可以异步分离执行。（注：�q�个事�g模型�~�省使用SyncTaskExecutor来执行listener的注册event�Q�所有该listener注册的event事�g�?/span>同步执行的）�?/p>
当然�Q�spring的这个机制还有很多应用的场景�Q�就不一一列�D了�?/p>
ApplicationEvent

事�g抽象�c�，里面只有一个构造函数和一个timestamp�?/p>
ApplicationListener

监听接口�Q�里面只有一个onApplicationEvent�Ҏ��。需要用戯��q��写ApplicationListener的实现�?/p>
ApplicationContext

spring上下�?其publishEvent�Ҏ��用于通知监听�?ApplicationListener的实�?注册event旉��.

publishEvent

void publishEvent(ApplicationEvent event)

Notify all listeners registered with this application of an application event.

源码解读�Q?br /> 1.作�ؓApplicationContext的实现AbstractApplicationContext.java的成员变�?a name="181">applicationListeners�Q�是一个ArrayList,保存了所有的ApplicationListener
2.利用ApplicationEventMulticaster接口里的�Ҏ��来完成注册监�?a class="r">addApplicationListener,�U�除监听removeApplicationListener�Q?/a>removeAllListeners�Q�以及通知监听注册事�gevent�Q?/a>multicastEvent(ApplicationEvent event);
上面说到的publishEvent�Ҏ��即��用了multicastEvent�Ҏ��

SimpleApplicationEventMultucaster作�ؓApplicationEventMulticaster的一个实玎ͼ�提供了multicastEvent的实��C��码，其实��是�q�代所有的监听器，用SyncTaskExecutor同步执行listener的onApplicationEvent

public void multicastEvent(final ApplicationEvent event) {

for (Iterator it = getApplicationListeners().iterator(); it

.hasNext();) {

final ApplicationListener listener = (ApplicationListener) it

.next();

getTaskExecutor().execute(new Runnable() {

public void run() {

listener.onApplicationEvent(event);
}
});
}

3.注意事项�Q�自��q��写ApplicationListener的实现时�Q�要注意不同的监听器处理不同的事�Ӟ��复写onApplicationEvent�Q�。原因就�?a name="181">multicastEvent的执行原理。它是�P代执行所有的监听�?/a>onApplicationEvent

�q�里�?/a>ApplicationEventMulticaster的类分布�?/a>

abstract public class AbstractApplicationEventMulticaster implements ApplicationEventMulticaster(Code)(Java Doc)
public interface ApplicationEventMulticaster (Code)(Java Doc)

public class SimpleApplicationEventMulticaster extends

�q�里是ApplicationContext的类分布�?br /> public class DefaultResourceLoader implements ResourceLoader(Code)(Java Doc)
public interface ResourceLoader (Code)(Java Doc)

abstract public class AbstractApplicationContext extends DefaultResourceLoader implements ConfigurableApplicationContext,DisposableBean(Code)(Java Doc)
public interface ConfigurableApplicationContext extends ApplicationContext,Lifecycle(Code)(Java Doc)
public interface DisposableBean (Code)(Java Doc)

public class GenericApplicationContext extends AbstractApplicationContext implements BeanDefinitionRegistry(Code)(Java Doc)
public interface BeanDefinitionRegistry (Code)(Java Doc)

abstract public class AbstractRefreshableApplicationContext extends
下面是spring自��n的事件应�?br /> 1) ContextRefreshedEvent�Q�当ApplicationContext初始化或者刷新时触发该事件�?br /> 2) ContextClosedEvent�Q�当ApplicationContext被关闭时触发该事件。容器被关闭�Ӟ��其管理的所有单例Bean都被销毁�?br /> 3) RequestHandleEvent�Q�在Web应用中，当一个http��h��Q�request�Q�结束触发该事�g�?br /> 4) ContestStartedEvent�Q�当容器调用ConfigurableApplicationContext的Start()�Ҏ��开�?重新开始容器时触发该事件�?br /> 5) ContestStopedEvent�Q�当容器调用ConfigurableApplicationContext的Stop()�Ҏ��停止容器时触发该事�g�?

阮步�?/a> 2010-09-01 10:41 发表评论

ibatis�ȝ��(1)

Mon, 30 Aug 2010 14:31:00 GMT

1.实体map.xml中配�|?
主键获取方式配置,mysql

        select LAST_INSERT_ID()

动态拼接where条�g


                plateId=#value#


2.config配置
typeAlias 定义�c�d��别名

typeHandler 自定义类型�{�?br /> 比如�Q�将数据库中�?�Q?�Q?格式的数据�{换�ؓjava 枚�D

�U�程�~�存�{�配�|?/p>
         cacheModelsEnabled="true"
     enhancementEnabled="true"
     lazyLoadingEnabled="false"
     maxRequests="32"
     maxSessions="10"
     maxTransactions="5"
     useStatementNamespaces="true"
    />
   cacheModelsEnabled="true" 是否启动�~�存机制
enhancementEnabled="true" 是否针对POJO启动字节码增强机制以提升getter/setter的调用效能避免��用javaReflect所带来的性能开销。同时Lazy Loading带来极大的性能提升�?br /> maxRequests最大�ƈ发请求数(Statement�?
maxTransactions最大�ƈ发事务数
maxSessions最大Session敎ͼ�卛_��前最大允许的�q�发SqlMapCliect数maxSessions讑֮�必须界于 maxTransactions和maxRequests之间.�?nbsp; maxTransactions>maxSessions>maxRequests

阮步�?/a> 2010-08-30 22:31 发表评论

使用ORMUnit��试数据库schema与Hibernate 实体的Map关系

Wed, 03 Mar 2010 06:55:00 GMT
ORMUnit下蝲链接�Q?br /> http://code.google.com/p/ormunit/
    在做面向关系数据库的应用�pȝ��的时候，db表结构在开发过�E�中�Q�可能会�׃��前期的设计不��_��致不断的修改表结构。如果Java层面采用�c�M��Hibernate ORM,随之对应的是maps & pojos的修攏V��此时修改后的简单测试就昑־��ؓ重要�?br />     ORMUnit功能比较多，本文只取其少数几个类�Q�完成上面的功能�?br />     1.首先改写�Q�HibernateORMTestCase�c�，指定加蝲的hibernate.cfg.xml位置
    public abstract class HibernateORMTestCase extends TestCase {
    protected Log logger = LogFactory.getLog(getClass());
    protected SessionFactory sessionFactory;
    //Location of hibernate.cfg.xml file.
    private static String CONFIG_FILE_LOCATION = "com/mmm/china/xxx/dbtest/hibernate.cfg.xml";

    protected Configuration cfg;

    public void setSessionFactory(SessionFactory sessionFactory) {
        this.sessionFactory = sessionFactory;
    }
    /**
     * make configuration
     * @return
     */
    protected Configuration getConfiguration() {
        if (cfg == null) {
            cfg=new Configuration().configure(CONFIG_FILE_LOCATION);
        }
        return cfg;
    }

   }
    2.HibernateSchemaChecker�c?��查db schema map pojo)�Q�改写输��Z��W�合map关系的表以及变更脚本�Q��ƈ增加计数功能
     List getSignificantDifferences(
            String[] script) {
        int num=0;
        List differences = new ArrayList();
        for (int i = 0; i < script.length; i++) {
            String line = script[i];

            if (line.indexOf("add constraint") == -1)
                {
                differences.add(line);
                 logger.error("DIFF_LINE>>>>>>>>>>="+line);
                }
            else{
                num++;//计算有多��个外键有问�?br />                 logger.info("CONSTRAINT_LINE>>>>>>>>>>"+num+"="+line);
            }
        }
        return differences;
    }
      注：ORMUnit ��查CONSTRAINT 有问题，在db为sqlserver�Ӟ��生成的外键约束的名称是自动命名的�Q�与实际数据库的命名不一��_��ORMUnit��p��Z��匚w��Q�所以，要过滤add constraint的error信息
   3.使用HibernateSchemaTests �q�行junit��试
    public class HibernateSchemaTests extends HibernateORMTestCase {

    private HibernateSchemaChecker schemaChecker;

    protected void setUp() throws Exception {
        super.setUp();
        schemaChecker = new HibernateSchemaChecker(getConfiguration(), getConfiguration().buildSessionFactory());
    }

    /**
    * Verifies all tables and columns referenced by the object/relational
    * mapping exist
    *
    * @throws Exception
    */
    public void assertDatabaseSchema() throws Exception {
        schemaChecker.assertDatabaseSchema();
    }

   }
�ȝ��Q�只需要三个类�Q�即可测试数据库schema与hibernate maps & pojo的map关系是否完全匚w��Q�事半功倍�?br />

阮步�?/a> 2010-03-03 14:55 发表评论

[导入]Apache CouchDB在Ubuntu下的安装

Sat, 27 Feb 2010 07:38:00 GMT

先下载couchdb安装文�g�Q�版本�ؓ0.9.1

http://couchdb.apache.org/downloads.html

1开始安装依赖包

sudo apt-get build-dep couchdb

sudo apt-get install libmozjs-dev libicu-dev libcurl4-gnutls-dev libtool

2.解压�~?/p>
tar -zxvf apache-couchdb-0.9.1.tar.gz

3.开始安�?/p>
cd apache-couchdb-0.9.1

./configure

make

sudo make install

4.启动couchdb

sudo couchdb

5.讉K��:http://127.0.0.1:5984/_utils/

启动报错�Q?/p>
$ bin/couchdb

Apache CouchDB 0.9.0a691361-incubating (LogLevel=info) is starting.

{"init terminating in do_boot",{{badmatch,{error,shutdown}},[{couch_server_sup,start_server,1},

{erl_eval,do_apply,5},{erl_eval,exprs,5},{init,start_it,1},{init,start_em,1}]}}

Crash dump was written to: erl_crash.dump

init terminating in do_boot ()

查了一下官方wiki:

原来是安装文件夹的权限问�?br />

解决办法�Q?br />

sudo adduser couchdb

chown -R couchdb:couchdb /usr/local/etc/couchdb

chown -R couchdb:couchdb /usr/local/var/lib/couchdb

chown -R couchdb:couchdb /usr/local/var/log/couchdb

chown -R couchdb:couchdb /usr/local/var/run

chmod -R 0770 /usr/local/etc/couchdb

chmod -R 0770 /usr/local/var/lib/couchdb

chmod -R 0770 /usr/local/var/log/couchdb

chmod -R 0770 /usr/local/var/run

再此启动�Q�看到欢�q�界面，所有的testsuite run success,大功告成�Q?/pre>

文章来源:http://guming.blogbus.com/logs/45898514.html

阮步�?/a> 2010-02-27 15:38 发表评论

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