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hibernate查詢為null

本文轉載自   查看原文   2017-03-10 10:17   1908    java/ 后台

     由於項目（ssh）有需求根據關鍵字查詢位於同一服務器下不同數據庫的2張表t_navi和t_news，由於涉及到分頁查詢，故不想自己手動去寫sql語句來實現跨表查詢，不但麻煩而且容易寫錯，所以想用Hibernate視圖來完成該功能，因此上網查看了一些資料，並最終完美解決，故將解決方案記錄如下：

 一、首先創建一個跨數據庫視圖

MySQL>create view db_cms.search_view as(select * from db_cms.t_navi)union all (select * from db_news.t_news);

注：由於t_navi 和 t_news兩張表字段數量和意義完全相同，所以這里使用了union all；

二、生成POJO類和Hibernate配置文件

       如果怕自己容易寫錯，可以使用Myeclipse通過視圖反向生成POJO類和**.hbm.xml,如果通過Myeclipse生成的話，將生成如下幾個文件：

       SearchView.java            SearchViewId.java              SearchView.hbm.xml

       1、SearchView.java

[java] view plain copy print?
  1. public class SearchView implements Serializable {  
  2.     /** 
  3.      *  
  4.      */  
  5.     private static final long serialVersionUID = -1372050399492830775L;  
  6.     private SearchViewId id;  
  7.       
  8.     public SearchViewId getId() {  
  9.         return id;  
  10.     }  
  11.   
  12.     public void setId(SearchViewId id) {  
  13.         this.id = id;  
  14.     }  
  15. }  
public class SearchView implements Serializable {
	/**
	 * 
	 */
	private static final long serialVersionUID = -1372050399492830775L;
	private SearchViewId id;
	
	public SearchViewId getId() {
		return id;
	}

	public void setId(SearchViewId id) {
		this.id = id;
	}
}

        2、SearchViewId.java

[java] view plain copy print?
  1. public class SearchViewId implements Serializable {  
  2.     private static final long serialVersionUID = -2960868353091674237L;  
  3.     private Integer id;  
  4.     private String naviTitle;  
  5.     private Boolean naviShow = true;  
  6.     private Boolean treeShow = true;  
  7.     private Boolean jumpHref = false;  
  8.     private Boolean windowOpen = false;  
  9.     private Integer auditStatus;  
  10.     private Date createDate;  
  11.     private Date updateDate;  
  12.     private String content;  
  13.     private String accessPath;  
  14.     private String jumpHrefUrl;  
  15.       
  16.     public Integer getId() {  
  17.         return id;  
  18.     }  
  19.   
  20.     public void setId(Integer id) {  
  21.         this.id = id;  
  22.     }  
  23.   
  24.     public String getNaviTitle() {  
  25.         return naviTitle;  
  26.     }  
  27.   
  28.     public void setNaviTitle(String naviTitle) {  
  29.         this.naviTitle = naviTitle;  
  30.     }  
  31.   
  32.     public Boolean getNaviShow() {  
  33.         return naviShow;  
  34.     }  
  35.   
  36.     public void setNaviShow(Boolean naviShow) {  
  37.         this.naviShow = naviShow;  
  38.     }  
  39.   
  40.     public Boolean getTreeShow() {  
  41.         return treeShow;  
  42.     }  
  43.   
  44.     public void setTreeShow(Boolean treeShow) {  
  45.         this.treeShow = treeShow;  
  46.     }  
  47.   
  48.     public Boolean getJumpHref() {  
  49.         return jumpHref;  
  50.     }  
  51.   
  52.     public void setJumpHref(Boolean jumpHref) {  
  53.         this.jumpHref = jumpHref;  
  54.     }  
  55.   
  56.     public Boolean getWindowOpen() {  
  57.         return windowOpen;  
  58.     }  
  59.   
  60.     public void setWindowOpen(Boolean windowOpen) {  
  61.         this.windowOpen = windowOpen;  
  62.     }  
  63.   
  64.     public Integer getAuditStatus() {  
  65.         return auditStatus;  
  66.     }  
  67.   
  68.     public void setAuditStatus(Integer auditStatus) {  
  69.         this.auditStatus = auditStatus;  
  70.     }  
  71.   
  72.     public Date getCreateDate() {  
  73.         return createDate;  
  74.     }  
  75.   
  76.     public void setCreateDate(Date createDate) {  
  77.         this.createDate = createDate;  
  78.     }  
  79.   
  80.     public Date getUpdateDate() {  
  81.         return updateDate;  
  82.     }  
  83.   
  84.     public void setUpdateDate(Date updateDate) {  
  85.         this.updateDate = updateDate;  
  86.     }  
  87.   
  88.     public String getContent() {  
  89.         return content;  
  90.     }  
  91.   
  92.     public void setContent(String content) {  
  93.         this.content = content;  
  94.     }  
  95.   
  96.     public String getAccessPath() {  
  97.         return accessPath;  
  98.     }  
  99.   
  100.     public void setAccessPath(String accessPath) {  
  101.         this.accessPath = accessPath;  
  102.     }  
  103.   
  104.     public String getJumpHrefUrl() {  
  105.         return jumpHrefUrl;  
  106.     }  
  107.   
  108.     public void setJumpHrefUrl(String jumpHrefUrl) {  
  109.         this.jumpHrefUrl = jumpHrefUrl;  
  110.     }  
  111. }  
public class SearchViewId implements Serializable {
	private static final long serialVersionUID = -2960868353091674237L;
	private Integer id;
	private String naviTitle;
	private Boolean naviShow = true;
	private Boolean treeShow = true;
	private Boolean jumpHref = false;
	private Boolean windowOpen = false;
	private Integer auditStatus;
	private Date createDate;
	private Date updateDate;
	private String content;
	private String accessPath;
	private String jumpHrefUrl;
	
	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getNaviTitle() {
		return naviTitle;
	}

	public void setNaviTitle(String naviTitle) {
		this.naviTitle = naviTitle;
	}

	public Boolean getNaviShow() {
		return naviShow;
	}

	public void setNaviShow(Boolean naviShow) {
		this.naviShow = naviShow;
	}

	public Boolean getTreeShow() {
		return treeShow;
	}

	public void setTreeShow(Boolean treeShow) {
		this.treeShow = treeShow;
	}

	public Boolean getJumpHref() {
		return jumpHref;
	}

	public void setJumpHref(Boolean jumpHref) {
		this.jumpHref = jumpHref;
	}

	public Boolean getWindowOpen() {
		return windowOpen;
	}

	public void setWindowOpen(Boolean windowOpen) {
		this.windowOpen = windowOpen;
	}

	public Integer getAuditStatus() {
		return auditStatus;
	}

	public void setAuditStatus(Integer auditStatus) {
		this.auditStatus = auditStatus;
	}

	public Date getCreateDate() {
		return createDate;
	}

	public void setCreateDate(Date createDate) {
		this.createDate = createDate;
	}

	public Date getUpdateDate() {
		return updateDate;
	}

	public void setUpdateDate(Date updateDate) {
		this.updateDate = updateDate;
	}

	public String getContent() {
		return content;
	}

	public void setContent(String content) {
		this.content = content;
	}

	public String getAccessPath() {
		return accessPath;
	}

	public void setAccessPath(String accessPath) {
		this.accessPath = accessPath;
	}

	public String getJumpHrefUrl() {
		return jumpHrefUrl;
	}

	public void setJumpHrefUrl(String jumpHrefUrl) {
		this.jumpHrefUrl = jumpHrefUrl;
	}
}

          3、SearchView.hbm.xml

[java] view plain copy print?
  1. <?xml version="1.0" encoding="UTF-8"?>  
  2. <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">  
  3.   
  4. <hibernate-mapping package="org.bgi.cms.domain" >  
  5.     <class name="SearchView" table="search_view" >  
  6.         <span style="color: rgb(255, 0, 0);"><composite-id name="id" class="SearchViewId">  
  7. </span>         <key-property name="id" type="integer">  
  8.                 <column name="id"/>  
  9.             </key-property>  
  10.             <key-property name="naviTitle" type="string">  
  11.                 <column name="navi_title" length="255" />  
  12.             </key-property>  
  13.             <key-property name="naviShow" type="yes_no">  
  14.                 <column name="is_navi_show"/>  
  15.             </key-property>  
  16.             <key-property name="treeShow" type="yes_no">  
  17.                 <column name="is_tree_show"/>  
  18.             </key-property>  
  19.             <key-property name="jumpHref" type="yes_no">  
  20.                 <column name="is_jump_href"/>  
  21.             </key-property>  
  22.             <key-property name="windowOpen" type="yes_no">  
  23.                 <column name="is_window_open"/>  
  24.             </key-property>  
  25.             <key-property name="auditStatus" type="integer">  
  26.                 <column name="audit_status"/>  
  27.             </key-property>  
  28.             <key-property name="createDate" type="timestamp">  
  29.                 <column name="create_date"/>  
  30.             </key-property>  
  31.             <key-property name="updateDate" type="timestamp">  
  32.                 <column name="update_date"/>  
  33.             </key-property>  
  34.             <key-property name="content" type="text">  
  35.                 <column name="content"/>  
  36.             </key-property>  
  37.             <key-property name="jumpHrefUrl" type="string">  
  38.                 <column name="jump_href_url" length="255"/>  
  39.             </key-property>  
  40.             <key-property name="accessPath" type="string">  
  41.                 <column name="access_path" length="45"/>  
  42.             </key-property>  
  43.         <span style="color: rgb(255, 0, 0);"></composite-id>  
  44. </span> </class>  
  45. </hibernate-mapping>  
<?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="org.bgi.cms.domain" >
	<class name="SearchView" table="search_view" >
		<composite-id name="id" class="SearchViewId">
			<key-property name="id" type="integer">
		    	<column name="id"/>
		   	</key-property>
		   	<key-property name="naviTitle" type="string">
		    	<column name="navi_title" length="255" />
		   	</key-property>
		   	<key-property name="naviShow" type="yes_no">
		    	<column name="is_navi_show"/>
		   	</key-property>
		   	<key-property name="treeShow" type="yes_no">
		    	<column name="is_tree_show"/>
		   	</key-property>
		   	<key-property name="jumpHref" type="yes_no">
		    	<column name="is_jump_href"/>
		   	</key-property>
		   	<key-property name="windowOpen" type="yes_no">
		    	<column name="is_window_open"/>
		   	</key-property>
		   	<key-property name="auditStatus" type="integer">
		    	<column name="audit_status"/>
		   	</key-property>
		   	<key-property name="createDate" type="timestamp">
		    	<column name="create_date"/>
		   	</key-property>
		   	<key-property name="updateDate" type="timestamp">
		    	<column name="update_date"/>
		   	</key-property>
		   	<key-property name="content" type="text">
		    	<column name="content"/>
		   	</key-property>
		   	<key-property name="jumpHrefUrl" type="string">
		    	<column name="jump_href_url" length="255"/>
		   	</key-property>
		   	<key-property name="accessPath" type="string">
		    	<column name="access_path" length="45"/>
		   	</key-property>
		</composite-id> </class> </hibernate-mapping>

        注：由於視圖是沒有主鍵的，所以Myeclipse生成的hbm.xml配置文件會將所有字段放在一起當做聯合主鍵，這樣做有一個問題就是，一旦視圖中某個字段為null的話，該條數據在做查詢時是查不出來的，所以現在暫時還不能完全確定可以使用該配置文件（如果這些聯合主鍵中的所有字段都是不能為空的話就沒有問題，完全可以放心的使用工具生成的改配置文件），因為在我的項目中，視圖中的content、jumpHrefUrl以及accessPath字段都是可以為空的，所以需要修改這3個文件，如下：

       1、SearchView.java（紅色的為修改的）

[java] view plain copy print?
  1. public class SearchView implements Serializable {  
  2.     /** 
  3.      *  
  4.      */  
  5.     private static final long serialVersionUID = -1372050399492830775L;  
  6.     private SearchViewId id;  
  7.   
  8. <span style="color: rgb(255, 0, 0);">   private String content;  
  9.     private String accessPath;  
  10.     private String jumpHrefUrl;  
  11. </span>   
  12.     public SearchViewId getId() {  
  13.         return id;  
  14.     }  
  15.   
  16.     public void setId(SearchViewId id) {  
  17.         this.id = id;  
  18.     }  
  19.       
  20.     <span style="color: rgb(255, 0, 0);">public String getContent() {  
  21.         return content;  
  22.     }  
  23.   
  24.     public void setContent(String content) {  
  25.         this.content = content;  
  26.     }  
  27.   
  28.     public String getAccessPath() {  
  29.         return accessPath;  
  30.     }  
  31.   
  32.     public void setAccessPath(String accessPath) {  
  33.         this.accessPath = accessPath;  
  34.     }  
  35.   
  36.     public String getJumpHrefUrl() {  
  37.         return jumpHrefUrl;  
  38.     }  
  39.   
  40.     public void setJumpHrefUrl(String jumpHrefUrl) {  
  41.         this.jumpHrefUrl = jumpHrefUrl;  
  42.     }  
  43. </span>}  
public class SearchView implements Serializable {
	/**
	 * 
	 */
	private static final long serialVersionUID = -1372050399492830775L;
	private SearchViewId id;

	private String content;
	private String accessPath;
	private String jumpHrefUrl;
	
	public SearchViewId getId() {
		return id;
	}

	public void setId(SearchViewId id) {
		this.id = id;
	}
	
	public String getContent() { return content; } public void setContent(String content) { this.content = content; } public String getAccessPath() { return accessPath; } public void setAccessPath(String accessPath) { this.accessPath = accessPath; } public String getJumpHrefUrl() { return jumpHrefUrl; } public void setJumpHrefUrl(String jumpHrefUrl) { this.jumpHrefUrl = jumpHrefUrl; } }

       2、SearchViewId.java（紅色的為修改的）

[java] view plain copy print?
  1. public class SearchViewId implements Serializable {  
  2.     private static final long serialVersionUID = -2960868353091674237L;  
  3.     private Integer id;  
  4.     private String naviTitle;  
  5.     private Boolean naviShow = true;  
  6.     private Boolean treeShow = true;  
  7.     private Boolean jumpHref = false;  
  8.     private Boolean windowOpen = false;  
  9.     private Integer auditStatus;  
  10.     private Date createDate;  
  11.     private Date updateDate;  
  12.   
  13. <span style="color: rgb(255, 0, 0);">       //  private String content;  
  14.        //   private String accessPath;  
  15.        //   private String jumpHrefUrl;  
  16. </span>   
  17.     public Integer getId() {  
  18.         return id;  
  19.     }  
  20.   
  21.     public void setId(Integer id) {  
  22.         this.id = id;  
  23.     }  
  24.   
  25.     public String getNaviTitle() {  
  26.         return naviTitle;  
  27.     }  
  28.   
  29.     public void setNaviTitle(String naviTitle) {  
  30.         this.naviTitle = naviTitle;  
  31.     }  
  32.   
  33.     public Boolean getNaviShow() {  
  34.         return naviShow;  
  35.     }  
  36.   
  37.     public void setNaviShow(Boolean naviShow) {  
  38.         this.naviShow = naviShow;  
  39.     }  
  40.   
  41.     public Boolean getTreeShow() {  
  42.         return treeShow;  
  43.     }  
  44.   
  45.     public void setTreeShow(Boolean treeShow) {  
  46.         this.treeShow = treeShow;  
  47.     }  
  48.   
  49.     public Boolean getJumpHref() {  
  50.         return jumpHref;  
  51.     }  
  52.   
  53.     public void setJumpHref(Boolean jumpHref) {  
  54.         this.jumpHref = jumpHref;  
  55.     }  
  56.   
  57.     public Boolean getWindowOpen() {  
  58.         return windowOpen;  
  59.     }  
  60.   
  61.     public void setWindowOpen(Boolean windowOpen) {  
  62.         this.windowOpen = windowOpen;  
  63.     }  
  64.   
  65.     public Integer getAuditStatus() {  
  66.         return auditStatus;  
  67.     }  
  68.   
  69.     public void setAuditStatus(Integer auditStatus) {  
  70.         this.auditStatus = auditStatus;  
  71.     }  
  72.   
  73.     public Date getCreateDate() {  
  74.         return createDate;  
  75.     }  
  76.   
  77.     public void setCreateDate(Date createDate) {  
  78.         this.createDate = createDate;  
  79.     }  
  80.   
  81.     public Date getUpdateDate() {  
  82.         return updateDate;  
  83.     }  
  84.   
  85.     public void setUpdateDate(Date updateDate) {  
  86.         this.updateDate = updateDate;  
  87.     }  
  88.   
  89. <span style="color: rgb(255, 0, 0);">       //</span>   <span style="color: rgb(255, 0, 0);">public String getContent() {  
  90.        //       return content;  
  91.        //   }  
  92.        //  
  93.        //   public void setContent(String content) {  
  94.        //       this.content = content;  
  95.        //   }  
  96.        //  
  97.        //   public String getAccessPath() {  
  98.        //       return accessPath;  
  99.        //   }  
  100.        //  
  101.        //   public void setAccessPath(String accessPath) {  
  102.        //       this.accessPath = accessPath;  
  103.        //   }  
  104.        //  
  105.        //   public String getJumpHrefUrl() {  
  106.        //       return jumpHrefUrl;  
  107.        //   }  
  108.        //  
  109.        //   public void setJumpHrefUrl(String jumpHrefUrl) {  
  110.        //       this.jumpHrefUrl = jumpHrefUrl;  
  111.        //   }  
  112. </span>}  
public class SearchViewId implements Serializable {
	private static final long serialVersionUID = -2960868353091674237L;
	private Integer id;
	private String naviTitle;
	private Boolean naviShow = true;
	private Boolean treeShow = true;
	private Boolean jumpHref = false;
	private Boolean windowOpen = false;
	private Integer auditStatus;
	private Date createDate;
	private Date updateDate;

       //	private String content;
       //	private String accessPath;
       //	private String jumpHrefUrl;
	
	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getNaviTitle() {
		return naviTitle;
	}

	public void setNaviTitle(String naviTitle) {
		this.naviTitle = naviTitle;
	}

	public Boolean getNaviShow() {
		return naviShow;
	}

	public void setNaviShow(Boolean naviShow) {
		this.naviShow = naviShow;
	}

	public Boolean getTreeShow() {
		return treeShow;
	}

	public void setTreeShow(Boolean treeShow) {
		this.treeShow = treeShow;
	}

	public Boolean getJumpHref() {
		return jumpHref;
	}

	public void setJumpHref(Boolean jumpHref) {
		this.jumpHref = jumpHref;
	}

	public Boolean getWindowOpen() {
		return windowOpen;
	}

	public void setWindowOpen(Boolean windowOpen) {
		this.windowOpen = windowOpen;
	}

	public Integer getAuditStatus() {
		return auditStatus;
	}

	public void setAuditStatus(Integer auditStatus) {
		this.auditStatus = auditStatus;
	}

	public Date getCreateDate() {
		return createDate;
	}

	public void setCreateDate(Date createDate) {
		this.createDate = createDate;
	}

	public Date getUpdateDate() {
		return updateDate;
	}

	public void setUpdateDate(Date updateDate) {
		this.updateDate = updateDate;
	}

 // public String getContent() { // return content; // } // // public void setContent(String content) { // this.content = content; // } // // public String getAccessPath() { // return accessPath; // } // // public void setAccessPath(String accessPath) { // this.accessPath = accessPath; // } // // public String getJumpHrefUrl() { // return jumpHrefUrl; // } // // public void setJumpHrefUrl(String jumpHrefUrl) { // this.jumpHrefUrl = jumpHrefUrl; // } }

           3、SearchView.hbm.xml（紅色的為修改的）

[java] view plain copy print?
  1. <?xml version="1.0" encoding="UTF-8"?>  
  2. <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">  
  3.   
  4. <hibernate-mapping package="org.bgi.cms.domain" >  
  5.     <class name="SearchView" table="search_view" >  
  6.         <composite-id name="id" class="SearchViewId">  
  7.             <key-property name="id" type="integer">  
  8.                 <column name="id"/>  
  9.             </key-property>  
  10.             <key-property name="naviTitle" type="string">  
  11.                 <column name="navi_title" length="255" />  
  12.             </key-property>  
  13.             <key-property name="naviShow" type="yes_no">  
  14.                 <column name="is_navi_show"/>  
  15.             </key-property>  
  16.             <key-property name="treeShow" type="yes_no">  
  17.                 <column name="is_tree_show"/>  
  18.             </key-property>  
  19.             <key-property name="jumpHref" type="yes_no">  
  20.                 <column name="is_jump_href"/>  
  21.             </key-property>  
  22.             <key-property name="windowOpen" type="yes_no">  
  23.                 <column name="is_window_open"/>  
  24.             </key-property>  
  25.             <key-property name="auditStatus" type="integer">  
  26.                 <column name="audit_status"/>  
  27.             </key-property>  
  28.             <key-property name="createDate" type="timestamp">  
  29.                 <column name="create_date"/>  
  30.             </key-property>  
  31.             <key-property name="updateDate" type="timestamp">  
  32.                 <column name="update_date"/>  
  33.             </key-property>  
  34.         </composite-id>  
  35. <span style="color: rgb(255, 0, 0);">       <property name="content" column="content" type="text" />  
  36.         <property name="jumpHrefUrl" column="jump_href_url" type="string" length="255" />  
  37.         <property name="accessPath" column="access_path" type="string" length="45" />  
  38. </span> </class>  
  39. </hibernate-mapping>  


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