yingruochen
- 浏览: 75099 次
- 性别:
- 来自: 北京
-
文章分类
最新评论
-
jnjeC：
SimpleMailMessage simpleMailM ...
MailSender和SimpleMailMessage的基本用法 -
duninet：
不用这么复杂，其实获取index变通一下即可：先调用getRo ...
easyui datagrid 动态删除行 -
du_bo：
请问楼主这个如何save（）
hibernate 无主键操作——联合主键 -
jugg：
擦 证书不行
CAS软件的安装 -
zyj177484：
能请问下，我用lucene3.6 为何用不了QueryResu ...
Lucene学习入门3
今天给了两个表，但是没有主键，傻眼了，没有配到过没有主键的表(哦承认自己少见多怪了)，上网查了一下要用联合主键，把一条数据看做一个主键，上网查了一下都说做好不要用联合主键，不用联合主键应该怎么做呢？思考中......
下来说说使用联合主键的方法吧。
用Myeclipse用具生成了四个类，分别是：TradeList.java,TradeListId.java,TradeInfo.java和TradeInfoId.java
具体的让我们来看一下：
package com.iplamp.enterprise.model;
import javax.persistence.Column;
import javax.persistence.Embeddable;
/**
* TradeListId entity. @author MyEclipse Persistence Tools
*/
@Embeddable
public class TradeListId implements java.io.Serializable {
// Fields
private String tradeId;
private String categoryId;
private String tradeName;
private String applier;
private Integer EId;
// Property accessors
@Column(name = "trade_id", length = 20)
public String getTradeId() {
return this.tradeId;
}
public void setTradeId(String tradeId) {
this.tradeId = tradeId;
}
@Column(name = "category_id", length = 20)
public String getCategoryId() {
return this.categoryId;
}
public void setCategoryId(String categoryId) {
this.categoryId = categoryId;
}
@Column(name = "trade_name")
public String getTradeName() {
return this.tradeName;
}
public void setTradeName(String tradeName) {
this.tradeName = tradeName;
}
@Column(name = "applier")
public String getApplier() {
return this.applier;
}
public void setApplier(String applier) {
this.applier = applier;
}
@Column(name = "e_id", nullable = false)
public Integer getEId() {
return this.EId;
}
public void setEId(Integer EId) {
this.EId = EId;
}
public boolean equals(Object other) {
if ((this == other))
return true;
if ((other == null))
return false;
if (!(other instanceof TradeListId))
return false;
TradeListId castOther = (TradeListId) other;
return ((this.getTradeId() == castOther.getTradeId()) || (this
.getTradeId() != null && castOther.getTradeId() != null && this
.getTradeId().equals(castOther.getTradeId())))
&& ((this.getCategoryId() == castOther.getCategoryId()) || (this
.getCategoryId() != null
&& castOther.getCategoryId() != null && this
.getCategoryId().equals(castOther.getCategoryId())))
&& ((this.getTradeName() == castOther.getTradeName()) || (this
.getTradeName() != null
&& castOther.getTradeName() != null && this
.getTradeName().equals(castOther.getTradeName())))
&& ((this.getApplier() == castOther.getApplier()) || (this
.getApplier() != null && castOther.getApplier() != null && this
.getApplier().equals(castOther.getApplier())))
&& ((this.getEId() == castOther.getEId()) || (this.getEId() != null
&& castOther.getEId() != null && this.getEId().equals(
castOther.getEId())));
}
public int hashCode() {
int result = 17;
result = 37 * result
+ (getTradeId() == null ? 0 : this.getTradeId().hashCode());
result = 37
* result
+ (getCategoryId() == null ? 0 : this.getCategoryId()
.hashCode());
result = 37 * result
+ (getTradeName() == null ? 0 : this.getTradeName().hashCode());
result = 37 * result
+ (getApplier() == null ? 0 : this.getApplier().hashCode());
result = 37 * result
+ (getEId() == null ? 0 : this.getEId().hashCode());
return result;
}
}
import javax.persistence.AttributeOverride;
import javax.persistence.AttributeOverrides;
import javax.persistence.Column;
import javax.persistence.EmbeddedId;
import javax.persistence.Entity;
import javax.persistence.Table;
/**
* TradeList entity. @author MyEclipse Persistence Tools
*/
@Entity
@Table(name = "ie_trade_list", catalog = "iplamp_enterprise")
public class TradeList implements java.io.Serializable {
public static String FIELD_EID = "id.EId" ;
public static String FIELD_TRADEID = "id.tradeId" ;
// Fields
private TradeListId id;
// Property accessors
@EmbeddedId
@AttributeOverrides({
@AttributeOverride(name = "tradeId", column = @Column(name = "trade_id", length = 20)),
@AttributeOverride(name = "categoryId", column = @Column(name = "category_id", length = 20)),
@AttributeOverride(name = "tradeName", column = @Column(name = "trade_name")),
@AttributeOverride(name = "applier", column = @Column(name = "applier")),
@AttributeOverride(name = "EId", column = @Column(name = "e_id", nullable = false)) })
public TradeListId getId() {
return this.id;
}
public void setId(TradeListId id) {
this.id = id;
}
}
import javax.persistence.Column;
import javax.persistence.Embeddable;
/**
* TradeInfoId entity. @author MyEclipse Persistence Tools
*/
@Embeddable
public class TradeInfoId implements java.io.Serializable {
// Fields
private String regNo;
private String catId;
private String applyDate;
private String applierCn;
private String applierAddrCn;
private String applierEn;
private String applierAddrEn;
private String tradeImgUrl;
private String tradeImgThumbUrl;
private String imgUrl;
private String imgThumbUrl;
private String serviceList;
private String similarGroup;
private String csggId;
private String zcggId;
private String csggDate;
private String zcggDate;
private String validYear;
private String hqzdDate;
private String gjczDate;
private String priorityDate;
private String agentName;
private String specifiedColor;
private String tradeType;
private String isShare;
private String remark;
private String tradeflow;
// Constructors
// Property accessors
@Column(name = "regNo", length = 20)
public String getRegNo() {
return this.regNo;
}
public void setRegNo(String regNo) {
this.regNo = regNo;
}
@Column(name = "catId", length = 20)
public String getCatId() {
return this.catId;
}
public void setCatId(String catId) {
this.catId = catId;
}
@Column(name = "applyDate", length = 20)
public String getApplyDate() {
return this.applyDate;
}
public void setApplyDate(String applyDate) {
this.applyDate = applyDate;
}
@Column(name = "applierCN")
public String getApplierCn() {
return this.applierCn;
}
public void setApplierCn(String applierCn) {
this.applierCn = applierCn;
}
@Column(name = "applierAddrCN")
public String getApplierAddrCn() {
return this.applierAddrCn;
}
public void setApplierAddrCn(String applierAddrCn) {
this.applierAddrCn = applierAddrCn;
}
@Column(name = "applierEN")
public String getApplierEn() {
return this.applierEn;
}
public void setApplierEn(String applierEn) {
this.applierEn = applierEn;
}
@Column(name = "applierAddrEN")
public String getApplierAddrEn() {
return this.applierAddrEn;
}
public void setApplierAddrEn(String applierAddrEn) {
this.applierAddrEn = applierAddrEn;
}
@Column(name = "tradeImgUrl")
public String getTradeImgUrl() {
return this.tradeImgUrl;
}
public void setTradeImgUrl(String tradeImgUrl) {
this.tradeImgUrl = tradeImgUrl;
}
@Column(name = "tradeImgThumbUrl")
public String getTradeImgThumbUrl() {
return this.tradeImgThumbUrl;
}
public void setTradeImgThumbUrl(String tradeImgThumbUrl) {
this.tradeImgThumbUrl = tradeImgThumbUrl;
}
@Column(name = "imgUrl")
public String getImgUrl() {
return this.imgUrl;
}
public void setImgUrl(String imgUrl) {
this.imgUrl = imgUrl;
}
@Column(name = "imgThumbUrl")
public String getImgThumbUrl() {
return this.imgThumbUrl;
}
public void setImgThumbUrl(String imgThumbUrl) {
this.imgThumbUrl = imgThumbUrl;
}
@Column(name = "serviceList")
public String getServiceList() {
return this.serviceList;
}
public void setServiceList(String serviceList) {
this.serviceList = serviceList;
}
@Column(name = "similarGroup")
public String getSimilarGroup() {
return this.similarGroup;
}
public void setSimilarGroup(String similarGroup) {
this.similarGroup = similarGroup;
}
@Column(name = "csggId")
public String getCsggId() {
return this.csggId;
}
public void setCsggId(String csggId) {
this.csggId = csggId;
}
@Column(name = "zcggId")
public String getZcggId() {
return this.zcggId;
}
public void setZcggId(String zcggId) {
this.zcggId = zcggId;
}
@Column(name = "csggDate")
public String getCsggDate() {
return this.csggDate;
}
public void setCsggDate(String csggDate) {
this.csggDate = csggDate;
}
@Column(name = "zcggDate")
public String getZcggDate() {
return this.zcggDate;
}
public void setZcggDate(String zcggDate) {
this.zcggDate = zcggDate;
}
@Column(name = "validYear")
public String getValidYear() {
return this.validYear;
}
public void setValidYear(String validYear) {
this.validYear = validYear;
}
@Column(name = "hqzdDate")
public String getHqzdDate() {
return this.hqzdDate;
}
public void setHqzdDate(String hqzdDate) {
this.hqzdDate = hqzdDate;
}
@Column(name = "gjczDate")
public String getGjczDate() {
return this.gjczDate;
}
public void setGjczDate(String gjczDate) {
this.gjczDate = gjczDate;
}
@Column(name = "priorityDate")
public String getPriorityDate() {
return this.priorityDate;
}
public void setPriorityDate(String priorityDate) {
this.priorityDate = priorityDate;
}
@Column(name = "agentName")
public String getAgentName() {
return this.agentName;
}
public void setAgentName(String agentName) {
this.agentName = agentName;
}
@Column(name = "specifiedColor")
public String getSpecifiedColor() {
return this.specifiedColor;
}
public void setSpecifiedColor(String specifiedColor) {
this.specifiedColor = specifiedColor;
}
@Column(name = "tradeType")
public String getTradeType() {
return this.tradeType;
}
public void setTradeType(String tradeType) {
this.tradeType = tradeType;
}
@Column(name = "isShare")
public String getIsShare() {
return this.isShare;
}
public void setIsShare(String isShare) {
this.isShare = isShare;
}
@Column(name = "remark")
public String getRemark() {
return this.remark;
}
public void setRemark(String remark) {
this.remark = remark;
}
@Column(name = "tradeflow")
public String getTradeflow() {
return this.tradeflow;
}
public void setTradeflow(String tradeflow) {
this.tradeflow = tradeflow;
}
public boolean equals(Object other) {
if ((this == other))
return true;
if ((other == null))
return false;
if (!(other instanceof TradeInfoId))
return false;
TradeInfoId castOther = (TradeInfoId) other;
return ((this.getRegNo() == castOther.getRegNo()) || (this.getRegNo() != null
&& castOther.getRegNo() != null && this.getRegNo().equals(
castOther.getRegNo())))
&& ((this.getCatId() == castOther.getCatId()) || (this
.getCatId() != null && castOther.getCatId() != null && this
.getCatId().equals(castOther.getCatId())))
&& ((this.getApplyDate() == castOther.getApplyDate()) || (this
.getApplyDate() != null
&& castOther.getApplyDate() != null && this
.getApplyDate().equals(castOther.getApplyDate())))
&& ((this.getApplierCn() == castOther.getApplierCn()) || (this
.getApplierCn() != null
&& castOther.getApplierCn() != null && this
.getApplierCn().equals(castOther.getApplierCn())))
&& ((this.getApplierAddrCn() == castOther.getApplierAddrCn()) || (this
.getApplierAddrCn() != null
&& castOther.getApplierAddrCn() != null && this
.getApplierAddrCn()
.equals(castOther.getApplierAddrCn())))
&& ((this.getApplierEn() == castOther.getApplierEn()) || (this
.getApplierEn() != null
&& castOther.getApplierEn() != null && this
.getApplierEn().equals(castOther.getApplierEn())))
&& ((this.getApplierAddrEn() == castOther.getApplierAddrEn()) || (this
.getApplierAddrEn() != null
&& castOther.getApplierAddrEn() != null && this
.getApplierAddrEn()
.equals(castOther.getApplierAddrEn())))
&& ((this.getTradeImgUrl() == castOther.getTradeImgUrl()) || (this
.getTradeImgUrl() != null
&& castOther.getTradeImgUrl() != null && this
.getTradeImgUrl().equals(castOther.getTradeImgUrl())))
&& ((this.getTradeImgThumbUrl() == castOther
.getTradeImgThumbUrl()) || (this.getTradeImgThumbUrl() != null
&& castOther.getTradeImgThumbUrl() != null && this
.getTradeImgThumbUrl().equals(
castOther.getTradeImgThumbUrl())))
&& ((this.getImgUrl() == castOther.getImgUrl()) || (this
.getImgUrl() != null && castOther.getImgUrl() != null && this
.getImgUrl().equals(castOther.getImgUrl())))
&& ((this.getImgThumbUrl() == castOther.getImgThumbUrl()) || (this
.getImgThumbUrl() != null
&& castOther.getImgThumbUrl() != null && this
.getImgThumbUrl().equals(castOther.getImgThumbUrl())))
&& ((this.getServiceList() == castOther.getServiceList()) || (this
.getServiceList() != null
&& castOther.getServiceList() != null && this
.getServiceList().equals(castOther.getServiceList())))
&& ((this.getSimilarGroup() == castOther.getSimilarGroup()) || (this
.getSimilarGroup() != null
&& castOther.getSimilarGroup() != null && this
.getSimilarGroup().equals(castOther.getSimilarGroup())))
&& ((this.getCsggId() == castOther.getCsggId()) || (this
.getCsggId() != null && castOther.getCsggId() != null && this
.getCsggId().equals(castOther.getCsggId())))
&& ((this.getZcggId() == castOther.getZcggId()) || (this
.getZcggId() != null && castOther.getZcggId() != null && this
.getZcggId().equals(castOther.getZcggId())))
&& ((this.getCsggDate() == castOther.getCsggDate()) || (this
.getCsggDate() != null
&& castOther.getCsggDate() != null && this
.getCsggDate().equals(castOther.getCsggDate())))
&& ((this.getZcggDate() == castOther.getZcggDate()) || (this
.getZcggDate() != null
&& castOther.getZcggDate() != null && this
.getZcggDate().equals(castOther.getZcggDate())))
&& ((this.getValidYear() == castOther.getValidYear()) || (this
.getValidYear() != null
&& castOther.getValidYear() != null && this
.getValidYear().equals(castOther.getValidYear())))
&& ((this.getHqzdDate() == castOther.getHqzdDate()) || (this
.getHqzdDate() != null
&& castOther.getHqzdDate() != null && this
.getHqzdDate().equals(castOther.getHqzdDate())))
&& ((this.getGjczDate() == castOther.getGjczDate()) || (this
.getGjczDate() != null
&& castOther.getGjczDate() != null && this
.getGjczDate().equals(castOther.getGjczDate())))
&& ((this.getPriorityDate() == castOther.getPriorityDate()) || (this
.getPriorityDate() != null
&& castOther.getPriorityDate() != null && this
.getPriorityDate().equals(castOther.getPriorityDate())))
&& ((this.getAgentName() == castOther.getAgentName()) || (this
.getAgentName() != null
&& castOther.getAgentName() != null && this
.getAgentName().equals(castOther.getAgentName())))
&& ((this.getSpecifiedColor() == castOther.getSpecifiedColor()) || (this
.getSpecifiedColor() != null
&& castOther.getSpecifiedColor() != null && this
.getSpecifiedColor().equals(
castOther.getSpecifiedColor())))
&& ((this.getTradeType() == castOther.getTradeType()) || (this
.getTradeType() != null
&& castOther.getTradeType() != null && this
.getTradeType().equals(castOther.getTradeType())))
&& ((this.getIsShare() == castOther.getIsShare()) || (this
.getIsShare() != null && castOther.getIsShare() != null && this
.getIsShare().equals(castOther.getIsShare())))
&& ((this.getRemark() == castOther.getRemark()) || (this
.getRemark() != null && castOther.getRemark() != null && this
.getRemark().equals(castOther.getRemark())))
&& ((this.getTradeflow() == castOther.getTradeflow()) || (this
.getTradeflow() != null
&& castOther.getTradeflow() != null && this
.getTradeflow().equals(castOther.getTradeflow())));
}
public int hashCode() {
int result = 17;
result = 37 * result
+ (getRegNo() == null ? 0 : this.getRegNo().hashCode());
result = 37 * result
+ (getCatId() == null ? 0 : this.getCatId().hashCode());
result = 37 * result
+ (getApplyDate() == null ? 0 : this.getApplyDate().hashCode());
result = 37 * result
+ (getApplierCn() == null ? 0 : this.getApplierCn().hashCode());
result = 37
* result
+ (getApplierAddrCn() == null ? 0 : this.getApplierAddrCn()
.hashCode());
result = 37 * result
+ (getApplierEn() == null ? 0 : this.getApplierEn().hashCode());
result = 37
* result
+ (getApplierAddrEn() == null ? 0 : this.getApplierAddrEn()
.hashCode());
result = 37
* result
+ (getTradeImgUrl() == null ? 0 : this.getTradeImgUrl()
.hashCode());
result = 37
* result
+ (getTradeImgThumbUrl() == null ? 0 : this
.getTradeImgThumbUrl().hashCode());
result = 37 * result
+ (getImgUrl() == null ? 0 : this.getImgUrl().hashCode());
result = 37
* result
+ (getImgThumbUrl() == null ? 0 : this.getImgThumbUrl()
.hashCode());
result = 37
* result
+ (getServiceList() == null ? 0 : this.getServiceList()
.hashCode());
result = 37
* result
+ (getSimilarGroup() == null ? 0 : this.getSimilarGroup()
.hashCode());
result = 37 * result
+ (getCsggId() == null ? 0 : this.getCsggId().hashCode());
result = 37 * result
+ (getZcggId() == null ? 0 : this.getZcggId().hashCode());
result = 37 * result
+ (getCsggDate() == null ? 0 : this.getCsggDate().hashCode());
result = 37 * result
+ (getZcggDate() == null ? 0 : this.getZcggDate().hashCode());
result = 37 * result
+ (getValidYear() == null ? 0 : this.getValidYear().hashCode());
result = 37 * result
+ (getHqzdDate() == null ? 0 : this.getHqzdDate().hashCode());
result = 37 * result
+ (getGjczDate() == null ? 0 : this.getGjczDate().hashCode());
result = 37
* result
+ (getPriorityDate() == null ? 0 : this.getPriorityDate()
.hashCode());
result = 37 * result
+ (getAgentName() == null ? 0 : this.getAgentName().hashCode());
result = 37
* result
+ (getSpecifiedColor() == null ? 0 : this.getSpecifiedColor()
.hashCode());
result = 37 * result
+ (getTradeType() == null ? 0 : this.getTradeType().hashCode());
result = 37 * result
+ (getIsShare() == null ? 0 : this.getIsShare().hashCode());
result = 37 * result
+ (getRemark() == null ? 0 : this.getRemark().hashCode());
result = 37 * result
+ (getTradeflow() == null ? 0 : this.getTradeflow().hashCode());
return result;
}
}
import javax.persistence.AttributeOverride;
import javax.persistence.AttributeOverrides;
import javax.persistence.Column;
import javax.persistence.EmbeddedId;
import javax.persistence.Entity;
import javax.persistence.Table;
/**
* TradeInfo entity. @author MyEclipse Persistence Tools
*/
@Entity
@Table(name = "ie_trade_info", catalog = "iplamp_enterprise")
public class TradeInfo implements java.io.Serializable {
public static String FIELD_REGNO = "id.regNo";
// Fields
private TradeInfoId id;
// Constructors
/**
* default constructor
*/
public TradeInfo() {
}
/**
* full constructor
*/
public TradeInfo(TradeInfoId id) {
this.id = id;
}
// Property accessors
@EmbeddedId
@AttributeOverrides({
@AttributeOverride(name = "regNo", column = @Column(name = "regNo", length = 20)),
@AttributeOverride(name = "catId", column = @Column(name = "catId", length = 20)),
@AttributeOverride(name = "applyDate", column = @Column(name = "applyDate", length = 20)),
@AttributeOverride(name = "applierCn", column = @Column(name = "applierCN")),
@AttributeOverride(name = "applierAddrCn", column = @Column(name = "applierAddrCN")),
@AttributeOverride(name = "applierEn", column = @Column(name = "applierEN")),
@AttributeOverride(name = "applierAddrEn", column = @Column(name = "applierAddrEN")),
@AttributeOverride(name = "tradeImgUrl", column = @Column(name = "tradeImgUrl")),
@AttributeOverride(name = "tradeImgThumbUrl", column = @Column(name = "tradeImgThumbUrl")),
@AttributeOverride(name = "imgUrl", column = @Column(name = "imgUrl")),
@AttributeOverride(name = "imgThumbUrl", column = @Column(name = "imgThumbUrl")),
@AttributeOverride(name = "serviceList", column = @Column(name = "serviceList")),
@AttributeOverride(name = "similarGroup", column = @Column(name = "similarGroup")),
@AttributeOverride(name = "csggId", column = @Column(name = "csggId")),
@AttributeOverride(name = "zcggId", column = @Column(name = "zcggId")),
@AttributeOverride(name = "csggDate", column = @Column(name = "csggDate")),
@AttributeOverride(name = "zcggDate", column = @Column(name = "zcggDate")),
@AttributeOverride(name = "validYear", column = @Column(name = "validYear")),
@AttributeOverride(name = "hqzdDate", column = @Column(name = "hqzdDate")),
@AttributeOverride(name = "gjczDate", column = @Column(name = "gjczDate")),
@AttributeOverride(name = "priorityDate", column = @Column(name = "priorityDate")),
@AttributeOverride(name = "agentName", column = @Column(name = "agentName")),
@AttributeOverride(name = "specifiedColor", column = @Column(name = "specifiedColor")),
@AttributeOverride(name = "tradeType", column = @Column(name = "tradeType")),
@AttributeOverride(name = "isShare", column = @Column(name = "isShare")),
@AttributeOverride(name = "remark", column = @Column(name = "remark")),
@AttributeOverride(name = "tradeflow", column = @Column(name = "tradeflow")) })
public TradeInfoId getId() {
return this.id;
}
public void setId(TradeInfoId id) {
this.id = id;
}
}
上面四个类是工具自动生成的。
下面做一个用根据e_id查询，带分页，按trade_id排序
/**
* 获取所有的对象
* @return
*/
public List<TradeList> getAll() {
return this.tradeListDao.loadAll();
}
public List<TradeList> getTradeList(PageBean pageBean, Integer eId) {
HibernateSearchCondition hsc = new HibernateSearchCondition();
hsc.addCriterion(Restrictions.eq(TradeList.FIELD_EID, eId));
// 按tradeId排序
hsc.addDESC(TradeList.FIELD_TRADEID); //降序
return getTradeListByPage(pageBean, hsc);
}
上面这个查询条件就相当于
Criteria c = this.getSession().createCriteria(TradeList.class)
.add(Restrictions.eq(TradeList.FIELD_EID, eId))
.addOrder(Order.desc(TradeList.FIELD_TRADEID));
条件就通过id.XXX(字段)来描述就可以了，其他的与有主键的相同
但是使用联合主键注意点 操作的时候自己注意点
建议：如非必要，不要使用联合主键，表中没有主键，但是在实体类中可以给某个字段建立主键关联，就像表中有主键一样就行了，但是必须保证作为主键的那个字段没有重复的值。
对视图的映射一般都没有主键，如果使用工具自动映射的话就会出现联合主键的，所以在映射的实体类中，我们可以把某个不能没有重复的值的字段当做主键来映射
分享到：
发表评论
相关推荐
【标题】与【描述】提及的是“Hibernate面试题专栏”，主要涵盖了全面的Hibernate面试题、笔试题以及相关问题，这表明我们将要讨论的是Java领域中著名的对象关系映射框架——Hibernate的相关知识。Hibernate是一个...
11. 联合主键与复合主键 对于多字段主键，可以使用`@IdClass`或`@EmbeddedId`注解进行配置。 12. 异步操作与批量处理 使用Hibernate的批处理更新或删除，可以显著提高性能。还可以结合JTA进行分布式事务管理。 ...
最后，书中可能还会讨论一些高级主题，如Hibernate的联合映射（Association Mapping）、继承映射（Inheritance Mapping）、复合主键（Composite Key）以及自定义类型（Custom Types）。这些特性允许开发者构建更复杂...
3. **对象关系映射**：深入讲解Hibernate的核心——对象关系映射（ORM），包括实体类的设计、属性注解、主键生成策略、关联映射（一对一、一对多、多对一、多对多）等，使开发者理解如何将Java对象与数据库表进行...
11. **联合实体映射**：讲解如何处理复杂的数据结构，如联合主键和复合实体。 12. **多态性与继承**：介绍如何在Hibernate中处理类继承关系，以及多态查询的实现。 13. **JPA集成**：如果指南也涵盖了JPA（Java ...
- 联合主键：多个字段共同组成主键。 - 继承映射：支持单表继承、多表继承等多种模式。 - 支持关联映射：一对一、一对多、多对一、多对多等各种关联关系。 - 支持延迟加载：只在真正需要时才加载关联对象，提高性能...
9. **查询语言HQL和Criteria API**：Hibernate提供了自己的SQL方言——HQL（Hibernate Query Language）和Criteria API，用于更面向对象的数据库查询。 10. **事务管理**：Hibernate支持编程式和声明式的事务管理，...
5. **Hibernate映射关系-多对多**：专门针对多对多关系，讲解如何配置中间表和联合主键，以实现两个实体间的复杂关联。 6. **Java反射机制**：虽然不是Hibernate的核心，但反射在ORM框架中扮演重要角色，用于动态...
《Hibernate 3.1.2Chinese》是针对Java开发者的一款持久化框架——Hibernate的中文教程。Hibernate是一个强大的ORM（对象关系映射）框架，它允许开发者用面向对象的方式来操作数据库，极大地简化了Java应用程序对...
《Hibernate——Java持久层框架深度解析》 Hibernate，作为Java领域中最流行的持久层框架之一，为开发者提供了便捷的对象关系映射（ORM）解决方案，极大地简化了数据库操作。本教程将从基础出发，全面深入地探讨...
3. **中间表配置**：虽然大多数情况下Hibernate会自动创建中间表，但你也可以通过`@JoinTable`注解自定义中间表的细节，如表名、联合主键等。例如： ```java @ManyToMany @JoinTable(name = "student_course", ...
组件映射允许将Java对象的字段或属性映射到数据库中的复合类型或联合主键。文档讲解了依赖对象、动态组件以及组件作为Map的索引或联合标识符的映射方法，提高了代码的可读性和维护性。 ### 继承映射 继承映射策略...
Hibernate提供了一种面向对象的查询语言——HQL，类似于SQL，但以对象和类为中心。此外，还可以使用Criteria API进行动态查询。 7. ** Criteria API** Criteria API提供了一种类型安全的查询方式，允许在运行时...
Hibernate 提供了自己的查询语言——HQL（Hibernate Query Language），它是面向对象的，语法类似SQL。此外，还可以使用 Criteria 查询、Query API 或者最新的JPQL（Java Persistence Query Language）。 7. **...
《Java JPA与Hibernate实战教程——模块二》 在Java开发领域，JPA（Java Persistence API）和Hibernate作为主流的ORM（对象关系映射）框架，对于数据持久化有着至关重要的作用。本教程的第二模块深入探讨了这两个...
《Java持久化API（JPA）2.0详解——基于javax.persistence-2.0.0.jar包》 Java持久化API（Java Persistence API，简称JPA）是Java平台上的一个标准，用于管理关系数据库中的数据。它为Java应用程序提供了一种对象/...
SQL不仅可以直接用于数据库查询，还可以通过编程语言（如Java、Python、C#等）中的数据库API或ORM框架（如JDBC、Hibernate、Django ORM）进行调用，实现数据的动态检索和更新。 #### 查询——SELECT语句的使用 ...
在设计一对一关系时，我们还应关注其在数据库映射中的实现，如使用外键约束或联合主键。在Java持久化API（JPA）或Hibernate等ORM框架中，可以配置实体之间的关系来实现一对一映射。 总结来说，Java中的对象一对一...
《Spring3.x企业应用开发实战》是在《精通Spring2.x——企业应用开发详解》的基础上，经过历时一年的重大调整改版而成的，本书延续了上一版本追求深度，注重原理，不停留在技术表面的写作风格，力求使读者在熟练...