[英]Hibernate - Not able to delete child Objects from Parent Object
我在應用程序中有一個映射到父對象的子對象列表。 現在,當用戶從UI刪除任何子條目時,我必須刪除子對象和父對象關聯,並從數據庫中刪除子記錄。 我的代碼中的所有內容似乎都很好,但是該代碼既沒有刪除父子關聯,也沒有從數據庫中刪除子記錄。 下面是我的代碼:
服務代碼:
List<ServerConfig> existingConfig = serverMasterService.getServerConfigForServer(serverId);
Set<ServerConfig> temp = new HashSet<ServerConfig>();
for (ServerConfig sConfig : serverMstr.getServerConfigs()) {
for (ServerConfig eConfig : existingConfig){
if(sConfig.getAttributeId() == eConfig.getAttributeId()){
sConfig.setConfigId(eConfig.getConfigId());
}else{
temp.add(sConfig);
}
}
sConfig.setServer(serverMstr);
}
serverMstr.getServerConfigs().removeAll(temp);
}
this.serverMasterService.saveServerMasters(serverMstr);
DAO代碼:
public void saveServerMasters(ServerMstr serverMstr) {
hibernateTemplate.saveOrUpdate(serverMstr);
}
父HBM文件:
<set name="serverConfigs" inverse="true" cascade="all" lazy="false">
<key>
<column name="serverId" not-null="true"/>
</key>
<one-to-many class="com.serverApp.business.model.ServerConfig"/>
</set>
子HBM文件:
<many-to-one name="server" class="com.serverApp.business.model.ServerMstr"
cascade="all" lazy="false" foreign-key="FK_SERVERMSTR" >
<column name="ServerId" not-null="true"/>
</many-to-one>
即使我通過以下代碼刪除了所有子記錄,子對象也不會被刪除。
serverMstr.getServerConfigs().removeAll(serverMstr.getServerConfigs());
this.serverMasterService.saveServerMasters(serverMstr);
編輯
父對象類:
package com.serverApp.business.model;
import java.util.Set;
import javax.xml.bind.annotation.XmlRootElement;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonProperty;
@XmlRootElement(name = "ServerMaster")
@JsonIgnoreProperties({"environmentMstr"})
public class ServerMstr {
@JsonProperty("ID")
private Long id;
@JsonProperty("ServerConfigs")
private Set<ServerConfig> serverConfigs;
public Set<ServerConfig> getServerConfigs() {
return serverConfigs;
}
public void setServerConfigs(Set<ServerConfig> serverConfigs) {
this.serverConfigs = serverConfigs;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
@JsonProperty("Name")
private String name;
@JsonProperty("Notes")
private String notes;
@JsonProperty("Location")
private String location;
@JsonProperty("SerialNo")
private String serialNo;
@JsonProperty("ServerFunction")
private String serverFunction;
@JsonProperty("ServerType")
private String serverType;
@JsonProperty("PrimAppl")
private String primAppl;
@JsonProperty("Status")
private String status;
@JsonProperty("IPAddress")
private String ipAddr;
public String getLocation() {
return location;
}
public void setLocation(String location) {
this.location = location;
}
public String getSerialNo() {
return serialNo;
}
public void setSerialNo(String serialNo) {
this.serialNo = serialNo;
}
public String getServerFunction() {
return serverFunction;
}
public void setServerFunction(String serverFunction) {
this.serverFunction = serverFunction;
}
public String getServerType() {
return serverType;
}
public void setServerType(String serverType) {
this.serverType = serverType;
}
public String getPrimAppl() {
return primAppl;
}
public void setPrimAppl(String primAppl) {
this.primAppl = primAppl;
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
public String getIpAddr() {
return ipAddr;
}
public void setIpAddr(String ipAddr) {
this.ipAddr = ipAddr;
}
public String getNotes() {
return notes;
}
public void setNotes(String notes) {
this.notes = notes;
}
public ServerMstr(){
}
public ServerMstr( String name, String notes ){
this.name = name;
this.notes=notes;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "ServerMstr [id=" + id + ", serverConfigs=" + serverConfigs
+ ", name=" + name + ", notes=" + notes + ", location="
+ location + ", serialNo=" + serialNo + ", serverFunction="
+ serverFunction + ", serverType=" + serverType + ", primAppl="
+ primAppl + ", status=" + status + ", ipAddr=" + ipAddr + "]";
}
}
子對象:
package com.serverApp.business.model;
import javax.xml.bind.annotation.XmlRootElement;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonProperty;
@XmlRootElement(name = "ServerConfig")
@JsonIgnoreProperties({"configId", "server"})
public class ServerConfig {
@JsonIgnore
private ServerMstr server;
private Long configId;
@Override
public String toString() {
return "ServerConfig [server=" + server.getName() + ", configId=" + configId
+ ", attributeId=" + attributeId + ", value=" + value
+ ", serverId=" + serverId + "]";
}
@JsonProperty("AttributeId")
private Long attributeId;
@JsonProperty("Value")
private String value;
@JsonProperty("ServerId")
private Long serverId;
public Long getConfigId() {
return configId;
}
public void setConfigId(Long configId) {
this.configId = configId;
}
public Long getServerId() {
return serverId;
}
public void setServerId(Long serverId) {
this.serverId = serverId;
}
public Long getAttributeId() {
return attributeId;
}
public void setAttributeId(Long attributeId) {
this.attributeId = attributeId;
}
public String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
}
public ServerConfig() {
}
public ServerConfig( Long serverId, Long attributeId, String value )
{
this.serverId = serverId;
this.attributeId = attributeId;
this.value=value;
}
public void setServer(ServerMstr server) {
this.server = server;
}
public ServerMstr getServer() {
return server;
}
}
DAO代碼:
package com.serverApp.business.dao;
import java.util.List;
import org.apache.log4j.Logger;
import org.hibernate.criterion.DetachedCriteria;
import org.hibernate.criterion.Restrictions;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;
import com.serverApp.business.model.ServerConfig;
import com.serverApp.business.model.ServerMstr;
@Repository ("serverMstrDao")
public class ServerMstrDaoImpl extends AbstractDAOImpl implements ServerMstrDao{
private static final Logger logger = Logger.getLogger(ServerMstrDaoImpl.class);
/*
* This Method will be used to retrieve the list of ServerMstr Class Details from the DB
* (non-Javadoc)
* @see com.serverApp.business.dao.ServerMstrDao#listServerMstrs()
*/
@Override
@SuppressWarnings({"unchecked" })
public List<ServerMstr> listServerMstrs() {
if (logger.isDebugEnabled()) {
logger.debug("Inside listServerMstrs() ");
}
return (List<ServerMstr>)hibernateTemplate.find("from ServerMstr");
}
/*
* This Method will be used to save new server to database
* (non-Javadoc)
* @see com.serverApp.business.dao.ServerMstrDao#saveServerMasters(com.serverApp.business.model.ServerMstr)
*/
@Override
@Transactional
public void saveServerMasters(ServerMstr serverMstr) {
if (logger.isDebugEnabled()) {
logger.debug("Inside saveServerMasters() ");
}
System.out.println("DAO Print: "+serverMstr.toString());
hibernateTemplate.saveOrUpdate(serverMstr);
}
/*
* This Method will be used to retrieve the ServerMstr Class Details from the DB for the given name
* (non-Javadoc)
* @see com.serverApp.business.dao.ServerMstrDao#getServerByName()
*/
@SuppressWarnings("unchecked")
@Override
public ServerMstr getServerByName(String name) {
if (logger.isDebugEnabled()) {
logger.debug("fetching server from database with name : " + name );
}
DetachedCriteria criteria = DetachedCriteria.forClass(ServerMstr.class);
criteria.add(Restrictions.eq("name", name));
List<ServerMstr> serverMstr = hibernateTemplate.findByCriteria(criteria);
if(serverMstr.size() != 1)
{
logger.error("Multiple or 0 row returned for selection Server name: " + name );
return null;
}
return (ServerMstr)serverMstr.get(0);
}
/*
* This Method will be used to retrieve the ServerConfig Class List from the DB for the given server id
* (non-Javadoc)
* @see com.serverApp.business.dao.ServerMstrDao#getServerConfigForServer()
*/
@SuppressWarnings("unchecked")
@Override
public List<ServerConfig> getServerConfigForServer(Long serverId) {
if (logger.isDebugEnabled()) {
logger.debug("fetching ServerConfig list from database for server with id : " + serverId );
}
return hibernateTemplate.find("from ServerConfig where serverId = ?",serverId);
}
}
任何幫助/建議都非常感謝
在這種情況下,您需要刪除孤兒 。 all
的級聯類型的確確實會級聯所有操作,但是要對子對象執行刪除操作,您需要在父對象上執行刪除操作,這不是您在示例中要執行的操作。 像這樣更改您的映射:
<set name="serverConfigs" inverse="true" cascade="all-delete-orphan" lazy="false">
<key>
<column name="serverId" not-null="true"/>
</key>
<one-to-many class="com.serverApp.business.model.ServerConfig"/>
</set>
您將需要在POJO對象中重寫equals和haschode方法。 如果不這樣做,則Hibernate將無法比較子對象,它們將繼續作為孤立對象存在於數據庫中。
另一個選擇是找到父級的所有子級,然后像下面的代碼一樣分別刪除它們。 :
Iterator<Child> i = form.getDeleteItems().iterator();
while(i.hasNext()){
Child child = i.next();
for (Iterator<Child> it = parent.getChildren().iterator();) {
if (child.getId().equals(it.next().getId()) {
it.remove();
}
}
}
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