Hibernate知识集锦
重要概念
get和load
在Hibernate 3.6.x中:
get会返回实际的对象实例,如果不存在则返回null,session.get(Superclass.class,id)与session.get(Concreteclass,id)的返回值完全一致。…
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12 years ago
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Hibernate基于XML的配置文件样例
Hibernate 3.0配置文件
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<?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"> <hibernate-configuration> <session-factory name="cpdb"> <property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property> <property name="hibernate.connection.password">CASTOR</property> <property name="hibernate.connection.url">jdbc:oracle:thin:@RD-DB-5.sparknet.com.cn:1522:CPDB</property> <property name="hibernate.connection.username">CASTOR</property> <property name="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</property> <property name="hibernate.jdbc.batch_size">20</property> <property name="hibernate.show_sql">true</property> <property name="hibernate.format_sql">true</property> <property name="hibernate.generate_statistics">true</property> <property name="hibernate.current_session_context_class">thread</property> </session-factory> </hibernate-configuration> |
XRM配置文件样例
XRM是Hibernate3里面的一个试验性功能,用于在数据库和XML文件之间进行映射
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<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" > <hibernate-mapping package="sparknet.traing.hxm.model"> <class entity-name="Corp" node="corp" table="T_CORP"> <comment> <![CDATA[ Corporation basic information ]]> </comment> <!-- 复合主键的映射 --> <composite-id name="id" node="-"> <key-property name="org" node="org" type="long"> <column name="ORG" sql-type="NUMBER(8)"> <comment>database Code</comment> </column> </key-property> <key-property name="id" node="id" type="long"> <column name="ID" sql-type="NUMBER(8)"> <comment>corporation identifier</comment> </column> </key-property> <key-property name="seqId" node="seq-id" type="long"> <column name="SEQ_ID" sql-type="NUMBER(8)"> <comment>changing sequence</comment> </column> </key-property> <generator class="foreign"> <param name="property">corpOther</param> </generator> </composite-id> <!-- 普通属性的映射 --> <property name="corpName" node="corp-name" type="string" unique="true" unique-key="UK_CORP_NAME"> <column name="CORP_NAME" sql-type="VARCHAR(64)"> <comment>corporation name</comment> </column> </property> <property name="regCapi" node="reg-capi" type="currency"> <column name="REG_CAPI" sql-type="NUMBER(14,2)"> <comment>registered capital</comment> </column> </property> <property name="startDate" node="start-date" type="fmt_date"> <column name="START_DATE" sql-type="DATE"> <comment> corporation start date</comment> </column> </property> <property name="startTime" node="start-time" type="fmt_time"> <column name="START_TIME" sql-type="DATE"> <comment> corporation start time</comment> </column> </property> <!-- 组件映射 --> <component name="address" node="addr" lazy="true"> <property name="street" node="street" type="string"> <column name="STREET" sql-type="VARCHAR2(128)"> <comment>address of street</comment> </column> </property> <property name="building" node="building" type="string"> <column name="BUILDING" sql-type="VARCHAR2(128)"> <comment>building</comment> </column> </property> <property name="zipCode" node="zip-code" type="int"> <column name="ZIP" sql-type="NUMBER(6)"> <comment>zip code</comment> </column> </property> </component> <!-- 共享主键的一对一关联,目前这个版本,会导致当前Class的主键不能映射到XML中? --> <one-to-one name="corpOther" entity-name="AdvancedCorpInfo" node="corp-other-info" constrained="true" cascade="all" /> <!-- 多对一映射 --> <many-to-one name="city" entity-name="City" embed-xml="true" node="city-code" cascade="all"> <column name="CITY_ID" sql-type="NUMBER(8)"> <comment>address of city</comment> </column> </many-to-one> <many-to-one name="gongShangOrg" node="belong-dist-org" entity-name="GongShangOrg" cascade="all"> <column name="GS_ORG" sql-type="NUMBER(8)"></column> <column name="GS_ID" sql-type="NUMBER(8)"></column> <column name="GS_SEQ_ID" sql-type="NUMBER(8)"></column> </many-to-one> <!-- 基于连接表的一对多双向关联,One端--> <list name="stocks" embed-xml="true" node="stocks-of-corp" cascade="all,delete-orphan" batch-size="20" table="T_M_CORP_STOCK"> <key not-null="true" foreign-key="FK_CORP_STOCK"> <column name="CORP_ORG" sql-type="NUMBER(8)" /> <column name="CORP_ID" sql-type="NUMBER(8)" /> <column name="CORP_SEQ_ID" sql-type="NUMBER(8)" /> </key> <list-index> <column name="ORD"> <comment>list index</comment> </column> </list-index> <many-to-many unique="true" entity-name="Stock" node="stock" embed-xml="true"> <column name="STOCK_ORG" sql-type="NUMBER(8)" /> <column name="STOCK_ID" sql-type="NUMBER(8)" /> <column name="STOCK_SEQ_ID" sql-type="NUMBER(8)" /> </many-to-many> </list> <!-- 基于外键的一对多关联,One端 --> <set name="oldStocks"> <key> <column name="CORP_ORG" sql-type="NUMBER(8)" /> <column name="CORP_ID" sql-type="NUMBER(8)" /> <column name="CORP_SEQ_ID" sql-type="NUMBER(8)" /> </key> <one-to-many entity-name="stock"/> </set> <property name="timestamp" node="timestamp" type="fmt_date_time"> <column name="STATE_DATE"> <comment>Version column</comment> </column> </property> </class> <class entity-name="Stock" node="Stock" table="T_STOCK"> <composite-id name="id" node="identifier"> <key-property name="org" node="org" type="long"> <column name="ORG" sql-type="NUMBER(8)"> <comment>database Code</comment> </column> </key-property> <key-property name="id" node="id" type="long"> <column name="ID" sql-type="NUMBER(8)"> <comment>stock identifier</comment> </column> </key-property> <key-property name="seqId" node="seq-id" type="long"> <column name="SEQ_ID" sql-type="NUMBER(8)"> <comment>changing sequence</comment> </column> </key-property> <generator class="assigned" /> </composite-id> <property name="stockName" node="stock-name" not-null="true" type="string"> <column name="NAME" sql-type="VARCHAR2(64)"> <comment>stock's name</comment> </column> </property> <property name="stockType" node="stock-type" type="string"> <column name="STOCK_TYPE" sql-type="VARCHAR2(64)"> <comment>type of a stock</comment> </column> </property> <property name="stockRegCapi" node="stock-registered-capital" type="double"> <column name="STOCK_REG_CAPI" sql-type="NUMBER(12,2)"> <comment>registered capital of a stock</comment> </column> </property> <property name="stockActualCapi" node="stock-actual-capital" type="double"> <column name="STOCK_ACTUAL_CAPI" sql-type="NUMBER(12,2)"> <comment>actual capital of a stock</comment> </column> </property> <property name="capiType" node="captial-type" type="string"> <column name="CAPI_TYPE" sql-type="VARCHAR2(64)"> <comment>capi type of a stock</comment> </column> </property> <!-- 基于连接表的一对多双向关联,Many端 --> <join table="T_M_CORP_STOCK" inverse="true" optional="true"> <key not-null="true" foreign-key="FK_CORP_STOCK"> <column name="STOCK_ORG" sql-type="NUMBER(8)" /> <column name="STOCK_ID" sql-type="NUMBER(8)" /> <column name="STOCK_SEQ_ID" sql-type="NUMBER(8)" /> </key> <!-- 注意:在本Sample中,如果下行embed-xml设置为true则导致循环引用,XML处理出错 --> <many-to-one name="corp" embed-xml="false" entity-name="Corp" node="corp-ref"> <column name="CORP_ORG" sql-type="NUMBER(8)" /> <column name="CORP_ID" sql-type="NUMBER(8)" /> <column name="CORP_SEQ_ID" sql-type="NUMBER(8)" /> </many-to-one> </join> </class> <class entity-name="GongShangOrg" node="org" table="T_DICT_ORG"> <composite-id name="id" node="-"> <key-property name="org" node="org" type="long"> <column name="ORG" sql-type="NUMBER(8)"> <comment>database Code</comment> </column> </key-property> <key-property name="id" node="id" type="long"> <column name="ID" sql-type="NUMBER(8)"> <comment>gong shang org identifier</comment> </column> </key-property> <key-property name="seqId" node="seq-id" type="long"> <column name="SEQ_ID" sql-type="NUMBER(8)"> <comment>changing sequence</comment> </column> </key-property> <generator class="assigned" /> </composite-id> <property name="orgName" node="org-name" type="string"> <column name="NAME" sql-type="VARCHAR2(64)"> <comment>city name</comment> </column> </property> </class> <class entity-name="AdvancedCorpInfo" node="adv-corp-info" table="T_CORP_OTHER"> <composite-id name="id" node="-"> <key-property name="org" node="org" type="long"> <column name="ORG" sql-type="NUMBER(8)"> <comment>database Code</comment> </column> </key-property> <key-property name="id" node="id" type="long"> <column name="ID" sql-type="NUMBER(8)"> <comment>corporation identifier</comment> </column> </key-property> <key-property name="seqId" node="seq-id" type="long"> <column name="SEQ_ID" sql-type="NUMBER(8)"> <comment>changing sequence</comment> </column> </key-property> <generator class="assigned" /> </composite-id> <property name="webSite" node="web-site" type="string"> <column name="WEB_URL" sql-type="VARCHAR2(128)"> <comment>web site url</comment> </column> </property> <property name="citySign" node="city-or-village" type="boolean"> <column name="CITY_SIGN" sql-type="NUMBER(1)"> <comment>city village flag</comment> </column> </property> </class> <class entity-name="City" node="City" table="T_DICT_CITY"> <comment> <![CDATA[ City dictionary ]]> </comment> <!-- 简单主键映射 --> <id name="cityId" node="-" type="long" > <column name="CITY_ID" sql-type="NUMBER(8)"> <comment>city identifier</comment> </column> <generator class="sequence"> <param name="sequence">SEQ_HXM</param> </generator> </id> <property name="cityName" node="-" type="string"> <column name="NAME" sql-type="VARCHAR2(64)"> <comment>city name</comment> </column> </property> <property name="cityCode" node="." type="int"> <column name="CODE" sql-type="NUMBER(4)"> <comment>city code</comment> </column> </property> </class> </hibernate-mapping> |
15 years ago
0