1 动态模型

1.1 说明

动态模型是指模型的属性是不固定的，可以添加和变更；也指不同模型，可以增加模型。不同模型在存储上为了性能和隔离，使用不同的表。但逻辑编写为了复用，一般使用同一个java类型。以下介绍如何对应。

1.2 java类

java类分固定属性和动态属性，固定属性直接建立属性即可，动态属性使用map类型。例如下面例子：

public class DynamicEntity extends BaseEntity { /** * */ private static final long serialVersionUID = 5907806428272321127L; /** * */ private Map<String, Object> dynamicProperties = new HashMap<String, Object>(); /** * 获取dynamicProperties. * * @return the dynamicProperties */ public Map<String, Object> getDynamicProperties() { return dynamicProperties; } /** * 设置dynamicProperties. * * @param dynamicProperties * the dynamicProperties to set */ public void setDynamicProperties(Map<String, Object> dynamicProperties) { this.dynamicProperties = dynamicProperties; } } public class YwEntity extends DynamicEntity { /** * */ private static final long serialVersionUID = -7655851107507073267L; private Integer gid; /** * billid . * */ private Integer billid; /** * 获取billid. * * @return the billid */ public Integer getBillid() { return billid; } /** * 设置billid. * * @param billid * the billid to set */ public void setBillid(Integer billid) { this.billid = billid; } }

1.3 hbm配置文件

由于一个模型对应多个数据库表，需使用 entityName 查询。

<?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> <class entity-name="entity1001" name="com.demo.YwEntity" table="entity1001"> <id name="gid" type="java.lang.Integer"> <generator class="assigned" /> </id> <property name="gid" type="java.lang.String"> <column name="gid" /> </property> <property name="billid" type="java.lang.Integer"> <column name="billid" /> </property> <dynamic-component insert="true" name="dynamicProperties" optimistic-lock="true" unique="false" update="true"> <property name="rq" type="java.util.Date"> <column name="rq" /> </property> <property name="ZBXM1" type="java.lang.String"> <column name="ZBXM1" /> </property> <property name="ZBXM2" type="java.lang.String"> <column name="ZBXM2" /> </property> <property name="ZBXM4" type="java.lang.String"> <column name="ZBXM4" /> </property> <property name="ZBXM5" type="java.lang.String"> <column name="ZBXM5" /> </property> <set name="ZB" cascade="save-update" inverse="true" lazy="false"> <key> <column name="gid" /> </key> <one-to-many entity-name="entity1001.ZB" /> </set> <set name="ZB1" cascade="save-update" inverse="true" lazy="false"> <key> <column name="gid" /> </key> <one-to-many entity-name="entity1001.ZB1" /> </set> </dynamic-component> </class> <class entity-name="entity1001.ZB" name="com.demo.Sub" table="entity1001_ZB"> <composite-id> <key-property name="gid" type="java.lang.Integer"></key-property> <key-property name="billid1" type="java.lang.Integer"></key-property> </composite-id> <property name="gid" type="java.lang.String"> <column name="gid" /> </property> <property name="billid" type="java.lang.Integer"> <column name="billid" /> </property> <dynamic-component insert="true" name="dynamicProperties" optimistic-lock="true" unique="false" update="true"> <property name="BH" type="java.lang.String"> <column name="BH" /> </property> </dynamic-component> </class> <class entity-name="entity1001.ZB1" name="com.demo.Sub" table="entity1001_ZB1"> <composite-id> <key-property name="gid" type="java.lang.Integer"></key-property> <key-property name="billid1" type="java.lang.Integer"></key-property> </composite-id> <property name="gid" type="java.lang.String"> <column name="gid" /> </property> <property name="billid" type="java.lang.Integer"> <column name="billid" /> </property> <dynamic-component insert="true" name="dynamicProperties" optimistic-lock="true" unique="false" update="true"> <property name="ZXM1" type="java.lang.String"> <column name="ZXM1" /> </property> <property name="ZXM3" type="java.lang.String"> <column name="ZXM3" /> </property> <property name="ZXM4" type="java.lang.String"> <column name="ZXM4" /> </property> </dynamic-component> </class> </hibernate-mapping>

1.4 保存查询

//保存 String entityName = EntityUtil.getEntityName(po); hibernateDao.getPojoTemplate().saveOrUpdate(entityName, po); //查询 String entityName = EntityUtil.getEntityName(classId, typeId); return hibernateDao.getPojoTemplate().get(entityName, key);

1.5 子表复合主键

子表模型实现 hashCode, equals方法。

@Override public int hashCode() { final int prime = 31; int result = 1; result = prime * result + ((billid1 == null) ? 0 : billid1.hashCode()); result = prime * result + ((gid== null) ? 0 : gid.hashCode()); return result; } /** * {@inheritDoc} * * @see java.lang.Object#equals(java.lang.Object) */ @Override public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; Sub other = (Sub) obj; if (billid1 == null) { if (other.billid1 != null) return false; } else if (!billid1.equals(other.billid1)) return false; if (ywid == null) { if (other.gid!= null) return false; } else if (!gid.equals(other.gid)) return false; return true; }

查询如下

Sub key = new Sub(); key.setBillid(vo.getBillid()); key.setGid(vo.getGid()); Sub po = (Sub) EntityUtil.get(vo, key);