hibernate一对多级联保存及删除(总结)

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本文介绍使用Hibernate实现一对多关系的级联保存与删除，包括采购单表头与单据行信息的具体实现方法。

以下为项目开发中总结：

hibernate一对多级联保存及删除：

采购单表头及单据行信息保存

1. 采购单表头对象 ("一方" 对象)

//采购单表头:(一方)

public class PssBuyHead implements java.io.Serializable {
 private Integer buyid;
 private PssDepot pssDepot;
 private PssSupplier pssSupplier;
 private TSysUser TSysUser;
 private String buynum;
 private String buybills;
 private Date buydate;
 private String buydes;
 private Integer buytotal;
 private String isok;
 private String buytype;
 private Date createdate;
 private Integer createpeople;
 private Integer sumnum;
 private Float sumprice;
 private Set<PssBuyLine> pssBuyLines = new HashSet<PssBuyLine>(0);
 (get...set...方法省略)

采用set集合对行信息的关联

private Set<PssBuyLine> pssBuyLines = new HashSet<PssBuyLine>(0);

采购单行信息对象 ("多方"对象)

public class PssBuyLine implements java.io.Serializable {

	private Integer productlinid;
	private PssBuyHead pssBuyHead;
	private String productbm;
	private String productname;
	private String standard;
	private String unit;
	private Integer productsum;
	private Float inprice;
	private Float buysummoney;
	private String product;
	private String productnum;
	private String productdes;

(get... set ...)

头信息对象

private PssBuyHead pssBuyHead;

2. 映射对象 .hbm.xml对象

"一方" 采购单头信息

<hibernate-mapping>
    <class name="com.business.buy.pojo.PssBuyHead" table="pss_buy_head">
        <id name="buyid" type="java.lang.Integer">
            <column name="BUYID" precision="8" scale="0"/>
            <generator class="increment"/>
        </id>
        <many-to-one name="pssDepot" class="com.business.base.pojo.PssDepot" lazy="false"  fetch="select">
            <column name="DEPOTID" precision="8" scale="0">
                <comment>仓库代码</comment>
            </column>
        </many-to-one>
        <many-to-one name="pssSupplier" class="com.business.base.pojo.PssSupplier" lazy="false" fetch="select">
            <column name="SUPPLIERID" precision="8" scale="0">
                <comment>供应商代码</comment>
            </column>
        </many-to-one>
        <many-to-one name="TSysUser" class="com.popedom.dyhx.pojo.TSysUser" lazy="false" fetch="select">
            <column name="USERID" precision="8" scale="0">
                <comment>用户ID</comment>
            </column>
        </many-to-one>
        <property name="buynum" type="java.lang.String">
            <column name="BUYNUM" length="20" />
        </property>
        <property name="buybills" type="java.lang.String">
            <column name="BUYBILLS" length="20" />
        </property>
        <property name="buydate" type="java.util.Date">
            <column name="BUYDATE" length="19" />
        </property>
        <property name="buydes" type="java.lang.String">
            <column name="BUYDES" length="40" />
        </property>
        <property name="buytotal" type="java.lang.Integer">
            <column name="BUYTOTAL" />
        </property>
        <property name="isok" type="java.lang.String">
            <column name="ISOK" length="10" />
        </property>
        <property name="buytype" type="java.lang.String">
            <column name="BUYTYPE" length="10" />
        </property>
        <property name="createdate" type="java.util.Date">
            <column name="CREATEDATE" length="19" />
        </property>
        <property name="createpeople" type="java.lang.Integer">
            <column name="CREATEPEOPLE" />
        </property>
        <property name="sumnum" type="java.lang.Integer">
            <column name="SUMNUM" />
        </property>
        <property name="sumprice" type="java.lang.Float">
            <column name="SUMPRICE" precision="10" />
        </property>
        <set name="pssBuyLines" inverse="false" lazy="false" cascade="all">
            <key>
                <column name="BUYID" precision="8" scale="0" />
            </key>
            <one-to-many class="com.business.buy.pojo.PssBuyLine" />
        </set>
    </class>
</hibernate-mapping>

"一"方关联"多方"对象

       <set name="pssBuyLines" inverse="false" lazy="false" cascade="all">
            <key>
                <column name="BUYID" precision="8" scale="0" />
            </key>
            <one-to-many class="com.business.buy.pojo.PssBuyLine" />
        </set>

采购单行信息(“多方”)

<hibernate-mapping>
    <class name="com.business.buy.pojo.PssBuyLine" table="pss_buy_line">
        <id name="productlinid" type="java.lang.Integer">
            <column name="PRODUCTLINID" precision="8" scale="0"/>
            <generator class="increment"/>
        </id>
        <many-to-one name="pssBuyHead" class="com.business.buy.pojo.PssBuyHead" fetch="select">
            <column name="BUYID" precision="8" scale="0" />
        </many-to-one>
        <property name="productbm" type="java.lang.String">
            <column name="PRODUCTBM" length="20" />
        </property>
        <property name="productname" type="java.lang.String">
            <column name="PRODUCTNAME" length="30" />
        </property>
        <property name="standard" type="java.lang.String">
            <column name="STANDARD" length="20" />
        </property>
        <property name="unit" type="java.lang.String">
            <column name="UNIT" length="8" />
        </property>
        <property name="productsum" type="java.lang.Integer">
            <column name="PRODUCTSUM" />
        </property>
        <property name="inprice" type="java.lang.Float">
            <column name="INPRICE" precision="10" />
        </property>
        <property name="buysummoney" type="java.lang.Float">
            <column name="BUYSUMMONEY" precision="10" />
        </property>
        <property name="product" type="java.lang.String">
            <column name="PRODUCT" length="20" />
        </property>
        <property name="productnum" type="java.lang.String">
            <column name="PRODUCTNUM" length="20" />
        </property>
        <property name="productdes" type="java.lang.String">
            <column name="PRODUCTDES" length="30" />
        </property>
    </class>
</hibernate-mapping>

"多方"关联"一方"对象

       <many-to-one name="pssBuyHead" class="com.business.buy.pojo.PssBuyHead" fetch="select">
            <column name="BUYID" precision="8" scale="0" />
        </many-to-one>

(以上代码调试通过)

总结： 1，一对多关联；

2，“一”方维护关系；(inverse="false" lazy="false" cascade="all")

3；级联操作并删除孤儿；
（inverse，cascade不能再“多”方的配置文件<many-to-one.../>中配置）

-----配置文件相关配置参数说明-----

cascade：级联，可选值为：none,save-update,delete,all,all-delete-orphan
inverse: 反转，表示由哪方维护关系false为自己维护，可选值:true,false

lazy: true/false ； false 为非延迟加载