Hibernate操作Clob類型完整版!

最近，使用Hibernate操作Clob。上網看了不少資料，感覺五花八門，實現起來的方法都各不相同。
有的是Hibernate2.0上的。有的是加入了spring的支持,把clob當成string做處理（的確很好，但是不適合新手）
........
而且，某些代碼根本都執行不了～浪費我們的時間，55555555。
於是，法老參考了一些官網的方法加以修改，乾脆重新寫一個完整元操作版本。
包含:insert,update,delete,select 四大基本方法!
供大家參考！
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測試環境介紹:
WINDWOS XP SP2；Eclipse 3.2；JDK 1.4.2
Hibernate-Version: 3.0.5 ； oracle 9i ；
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重點說明:
1。配置文件hbm.xml裏把clob的type="clob"
片段如下
<property name="bsznContent" type="clob">
            <column name="BSZN_CONTENT" not-null="true" />
</property>
2。實體bean中,導入java.sql.Clob包（注意不是oracle.sql.CLOB 個人習慣用血統純點的.這裏鄙視一下oracle。嘿嘿）
   在該字段對應的實體文件裏面，增加以下兩個變量及其相應的get/set方法
import java.sql.Clob;
...
private Clob bsznContent;
private String bsznContentString;
...
    public Clob getBsznContent() {
        return this.bsznContent;
    }

    public void setBsznContent(Clob bsznContent) {
        this.bsznContent = bsznContent;
    }
    public String getBsznContentString() {
        return bsznContentString;
    }

    public void setBsznContentString(String bsznContentString) {
        this.bsznContentString = bsznContentString;
    }
bsznContent 屬性是默認的clob,bsznContentString 屬性是對bsznContent做轉換時候用的
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好了廢話不多說，把代碼寫下來吧～
建表SQL
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/**//* Table: "cmp_bszn" 相關SQL                                    */
/**//==============================================================/
create table "cmp_bszn"  (
   "id"                 INTEGER                         not null,
   "kind"               CHAR(2)                         not null,
   "bszn_title1"        VARCHAR2(200)                   not null,
   "bszn_title2"        VARCHAR2(200),
   "bszn_code"          VARCHAR2(50),
   "bszn_bumen"         VARCHAR2(50),
   "bszn_date"          VARCHAR2(50),
   "bszn_content"       CLOB                            not null,
   "sys_date"           DATE                           default SYSDATE not null,
   constraint PK_CMP_BSZN primary key ("id")
);

hibernate.cfg.xml 由於調試用，用的是JDBC連接方法，要使用連接池，請自行修改.
記得自己把數據庫地址和用戶名，祕密改下

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">


<hibernate-configuration>

<session-factory>
    <property name="connection.username">sa</property>
    <property name="connection.url">
        jdbc:oracle:thin:@127.0.0.1:1521:web
    </property>
    <property name="dialect">
        org.hibernate.dialect.Oracle9Dialect
    </property>
    <property name="connection.password">saweb</property>
    <property name="connection.driver_class">
        oracle.jdbc.driver.OracleDriver
    </property>

    <property name="show_sql">true</property>
    <property name="connection.useUnicode">true</property>
    <property name="connection.characterEncoding">GBK</property>
    
    <property name="hibernate.transaction.factory_class">
        org.hibernate.transaction.JDBCTransactionFactory
    </property>
    <property name="hibernate.query.factory_class">
        org.hibernate.hql.classic.ClassicQueryTranslatorFactory
    </property>
    <mapping resource="clob/cmpBszn.hbm.xml" />
</session-factory>

</hibernate-configuration>

cmpBszn.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
    <class name="cmpBszn" table="CMP_BSZN" schema="SA">
        <id name="id" type="java.lang.Long">
            <column name="ID" precision="22" scale="0" />
            <generator class="increment"></generator>
        </id>
        <property name="kind" type="java.lang.String">
            <column name="KIND" length="2" not-null="true" />
        </property>
        <property name="bsznTitle1" type="java.lang.String">
            <column name="BSZN_TITLE1" length="200" not-null="true" />
        </property>
        <property name="bsznTitle2" type="java.lang.String">
            <column name="BSZN_TITLE2" length="200" />
        </property>
        <property name="bsznCode" type="java.lang.String">
            <column name="BSZN_CODE" length="50" />
        </property>
        <property name="bsznBumen" type="java.lang.String">
            <column name="BSZN_BUMEN" length="50" />
        </property>
        <property name="bsznDate" type="java.lang.String">
            <column name="BSZN_DATE" length="50" />
        </property>
        <property name="bsznContent" type="clob">
            <column name="BSZN_CONTENT" not-null="true" />
        </property>
        <property name="sysDate" type="java.util.Date">
            <column name="SYS_DATE" length="7" not-null="true" />
        </property>
    </class>
</hibernate-mapping>

抽象類AbstractcmpBszn.java

// default package

import java.sql.Clob;
import java.util.Date;

/** *//**
* AbstractcmpBszn generated by MyEclipse - Hibernate Tools
*/

public abstract class AbstractcmpBszn  implements java.io.Serializable ...{

    // Fields

     private Long id;
     private String kind;
     private String bsznTitle1;
     private String bsznTitle2;
     private String bsznCode;
     private String bsznBumen;
     private String bsznDate;
     private Clob bsznContent;
     private String bsznContentString;
     private Date sysDate;

    // Constructors

    /** *//** default constructor */
    public AbstractcmpBszn() ...{
    }

    /** *//** minimal constructor */
    public AbstractcmpBszn(String kind, String bsznTitle1, Clob bsznContent, Date sysDate) ...{
        this.kind = kind;
        this.bsznTitle1 = bsznTitle1;
        this.bsznContent = bsznContent;
        this.sysDate = sysDate;
    }

    /** *//** full constructor */
    public AbstractcmpBszn(String kind, String bsznTitle1, String bsznTitle2, String bsznCode, String bsznBumen, String bsznDate, Clob bsznContent, Date sysDate) ...{
        this.kind = kind;
        this.bsznTitle1 = bsznTitle1;
        this.bsznTitle2 = bsznTitle2;
        this.bsznCode = bsznCode;
        this.bsznBumen = bsznBumen;
        this.bsznDate = bsznDate;
        this.bsznContent = bsznContent;
        this.sysDate = sysDate;
    }


    // Property accessors

    public Long getId() ...{
        return this.id;
    }

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

    public String getKind() ...{
        return this.kind;
    }

    public void setKind(String kind) ...{
        this.kind = kind;
    }

    public String getBsznTitle1() ...{
        return this.bsznTitle1;
    }

    public void setBsznTitle1(String bsznTitle1) ...{
        this.bsznTitle1 = bsznTitle1;
    }

    public String getBsznTitle2() ...{
        return this.bsznTitle2;
    }

    public void setBsznTitle2(String bsznTitle2) ...{
        this.bsznTitle2 = bsznTitle2;
    }

    public String getBsznCode() ...{
        return this.bsznCode;
    }

    public void setBsznCode(String bsznCode) ...{
        this.bsznCode = bsznCode;
    }

    public String getBsznBumen() ...{
        return this.bsznBumen;
    }

    public void setBsznBumen(String bsznBumen) ...{
        this.bsznBumen = bsznBumen;
    }

    public String getBsznDate() ...{
        return this.bsznDate;
    }

    public void setBsznDate(String bsznDate) ...{
        this.bsznDate = bsznDate;
    }

    public Clob getBsznContent() ...{
        return this.bsznContent;
    }

    public void setBsznContent(Clob bsznContent) ...{
        this.bsznContent = bsznContent;
    }

    public Date getSysDate() ...{
        return this.sysDate;
    }

    public void setSysDate(Date sysDate) ...{
        this.sysDate = sysDate;
    }

    public String getBsznContentString() ...{
        return bsznContentString;
    }

    public void setBsznContentString(String bsznContentString) ...{
        this.bsznContentString = bsznContentString;
    }


}

實體類cmpBszn

// default package
// Generated by MyEclipse - Hibernate Tools

import java.sql.Clob;
import java.util.Date;

/** *//**
* cmpBszn generated by MyEclipse - Hibernate Tools
*/
public class cmpBszn extends AbstractcmpBszn implements java.io.Serializable ...{

    // Constructors

    /** *//** default constructor */
    public cmpBszn() ...{
    }

    /** *//** minimal constructor */
    public cmpBszn(String kind, String bsznTitle1, Clob bsznContent, Date sysDate) ...{
        super(kind, bsznTitle1, bsznContent, sysDate);
    }

    /** *//** full constructor */
    public cmpBszn(String kind, String bsznTitle1, String bsznTitle2, String bsznCode, String bsznBumen, String bsznDate, Clob bsznContent, Date sysDate) ...{
        super(kind, bsznTitle1, bsznTitle2, bsznCode, bsznBumen, bsznDate, bsznContent, sysDate);
    }

}

SessionManager管理類（這個是通用的，如果你要自己寫也可以）

package Hib_DB;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.cfg.Configuration;

/** *//**
* Configures and provides access to Hibernate sessions, tied to the
* current thread of execution.  Follows the Thread Local Session
* pattern, see {@link http://hibernate.org/42.html }.
*/
public class SessionManager ...{

    /** *//**
     * Location of hibernate.cfg.xml file.
     * Location should be on the classpath as Hibernate uses
     * #resourceAsStream style lookup for its configuration file.
     * The default classpath location of the hibernate config file is
     * in the default package. Use #setConfigFile() to update
     * the location of the configuration file for the current session.
     */
    private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml";
    private static final ThreadLocal threadLocal = new ThreadLocal();
    private  static Configuration configuration = new Configuration();
    private static org.hibernate.SessionFactory sessionFactory;
    private static String configFile = CONFIG_FILE_LOCATION;

    private SessionManager() ...{
    }

    /** *//**
     * Returns the ThreadLocal Session instance.  Lazy initialize
     * the <code>SessionFactory</code> if needed.
     *
     *  @return Session
     *  @throws HibernateException
     */
    public static Session getSession() throws HibernateException ...{
        Session session = (Session) threadLocal.get();

        if (session == null || !session.isOpen()) ...{
            if (sessionFactory == null) ...{
                rebuildSessionFactory();
            }
            session = (sessionFactory != null) ? sessionFactory.openSession()
                    : null;
            threadLocal.set(session);
        }

        return session;
    }

    /** *//**
     *  Rebuild hibernate session factory
     *
     */
    public static void rebuildSessionFactory() ...{
        try ...{
            configuration.configure(configFile);
            sessionFactory = configuration.buildSessionFactory();
        } catch (Exception e) ...{
            System.err
                    .println("%%%% Error Creating SessionFactory %%%%");
            e.printStackTrace();
        }
    }

    /** *//**
     *  Close the single hibernate session instance.
     *
     *  @throws HibernateException
     */
    public static void closeSession() throws HibernateException ...{
        Session session = (Session) threadLocal.get();
        threadLocal.set(null);

        if (session != null) ...{
            session.close();
        }
    }

    /** *//**
     *  return session factory
     *
     */
    public static org.hibernate.SessionFactory getSessionFactory() ...{
        return sessionFactory;
    }

    /** *//**
     *  return session factory
     *
     *    session factory will be rebuilded in the next call
     */
    public static void setConfigFile(String configFile) ...{
        SessionManager.configFile = configFile;
        sessionFactory = null;
    }

    /** *//**
     *  return hibernate configuration
     *
     */
    public static Configuration getConfiguration() ...{
        return configuration;
    }

}

Test_Work實際測試類

import java.sql.SQLException;
import java.util.Date;
import java.util.Iterator;
import java.util.List;

import org.hibernate.Hibernate;
import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;

import Hib_DB.SessionManager;

public class Test_Work ...{

    /** *//**
     * @param args
     * @throws SQLException
     * @throws SQLException
     *
/==============================================================/
/**//* Table: "cmp_bszn" 相關SQL                                    */
/**//==============================================================/
/**//*
create table "cmp_bszn"  (
   "id"                 INTEGER                         not null,
   "kind"               CHAR(2)                         not null,
   "bszn_title1"        VARCHAR2(200)                   not null,
   "bszn_title2"        VARCHAR2(200),
   "bszn_code"          VARCHAR2(50),
   "bszn_bumen"         VARCHAR2(50),
   "bszn_date"          VARCHAR2(50),
   "bszn_content"       CLOB                            not null,
   "sys_date"           DATE                           default SYSDATE not null,
   constraint PK_CMP_BSZN primary key ("id")
);
*/
    public static void main(String[] args) throws SQLException ...{
        Test_Work exam = new Test_Work();
         /**//Insert/
         exam.InsertRecords();
         exam.QueryRecords();
         /**//Update/
         exam.Demo_Update(new Long(5));
         /**//Delete/
         exam.DeleteRecords(new Long(3));
    }

    /**//*
     * 查詢
     */
    private void QueryRecords() throws SQLException ...{
        try ...{
            Session session = SessionManager.getSession();
            Query records = session.createQuery("from cmpBszn order by id");
            List record = records.list();
            Iterator iterator = record.iterator();
            while (iterator.hasNext()) ...{
                cmpBszn obj = (cmpBszn) iterator.next();
                System.out.println(obj.getId() + "" + obj.getKind());
                java.sql.Clob clob = obj.getBsznContent();
                if (clob != null) ...{
                    String b1 = clob.getSubString(1, (int) clob.length());
                    obj.setBsznContentString(b1);
                }
                System.out.println(obj.getBsznContentString());
                System.out.println("----------------------------------");
            }
            System.out.println(record.size());
        } catch (HibernateException e) ...{
            System.out.println("error");
        } finally ...{
            try ...{
                // Step 5 - close the session
                SessionManager.closeSession();
            } catch (HibernateException e1) ...{
                // do nothing
            }
        }
    }

    private void QueryRecords(Long id) throws SQLException ...{
        try ...{
            Session session = SessionManager.getSession();
            Query records = session
                    .createQuery("from cmpBszn order by id where id = " + id);
            List record = records.list();
            Iterator iterator = record.iterator();
            while (iterator.hasNext()) ...{
                cmpBszn obj = (cmpBszn) iterator.next();
                java.sql.Clob clob = obj.getBsznContent();
                if (clob != null) ...{
                    String b1 = clob.getSubString(1, (int) clob.length());
                    obj.setBsznContentString(b1);
                }
                System.out.println(obj.getId() + "" + obj.getKind() + ""
                        + obj.getBsznTitle1());
                System.out.println("內容:" + obj.getBsznContentString());
                System.out.println("----------------------------------");
            }
        } catch (HibernateException e) ...{
            System.out.println("error");
        } finally ...{
            try ...{
                // Step 5 - close the session
                SessionManager.closeSession();
            } catch (HibernateException e1) ...{
                // do nothing
            }
        }
    }

    /**//*
     * 插入
     */
    private void InsertRecords() ...{
        String kind = "03";
        String bsznTitle1 = "ttttttttt";
        String bsznContentString = "哈哈成功了";
        Date sysDate = new Date();
        try ...{
            Session session = SessionManager.getSession();
            Transaction tx = session.beginTransaction();
            cmpBszn obj = new cmpBszn();
            obj.setKind(kind);
            obj.setBsznTitle1(bsznTitle1);
            obj.setSysDate(sysDate);
            obj.setBsznContent(Hibernate.createClob(bsznContentString));//關鍵createClob方法
            session.save(obj);
            tx.commit();
            System.out.println("Save Success.");
        } catch (Exception e) ...{
            System.out.println("Save failed.");
        } finally ...{
            try ...{
                SessionManager.closeSession();
            } catch (HibernateException e1) ...{
            }
        }
    }
//修改
    private void UpdateRecords(Long id) ...{
        String kind = "03";
        String bsznTitle1 = "update_test";
        String bsznContentString = "修改更新";
        Date sysDate = new Date();
        try ...{
            Session session = SessionManager.getSession();
            Transaction tx = session.beginTransaction();
            cmpBszn obj = (cmpBszn) session.load(cmpBszn.class, id);
            obj.setKind(kind);
            obj.setBsznTitle1(bsznTitle1);
            obj.setSysDate(sysDate);
            obj.setBsznContent(Hibernate.createClob(bsznContentString));// 關鍵
            session.update(obj);
            tx.commit();
            System.out.println("Save Success.");
        } catch (Exception e) ...{
            System.out.println("Save failed.");
        } finally ...{
            try ...{
                SessionManager.closeSession();
            } catch (HibernateException e1) ...{
            }
        }
    }

    /**//*
     * 刪除記錄
     */
    private void DeleteRecords(Long id) ...{
        try ...{
            Session session = SessionManager.getSession();
            cmpBszn message = (cmpBszn) session.load(cmpBszn.class, id);
            Transaction tx = session.beginTransaction();
            session.delete(message);
            tx.commit();
            System.out.println("Delete successful.");
        } catch (HibernateException e) ...{
            // TODO 自動生成 catch 塊
            e.printStackTrace();
            System.out.println("刪除失敗！");
        } finally ...{
            try ...{
                // Step 5 - close the session
                SessionManager.closeSession();
            } catch (HibernateException e1) ...{
                // do nothing
            }
        }

    }

    private void Demo_Update(Long id) throws SQLException ...{
        System.out.println("修改前:");
        this.QueryRecords(id);
        this.UpdateRecords(id);
        System.out.println("修改後:");
        this.QueryRecords(id);
    }
}

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好了～基本的核心代碼都在這裏了～
寫完後才發現QueryRecords(Long id)這個方法寫的比較呆～效率不高～大家可以自己改寫～

參考文章:
關於Clob類型在Hibernate中的應用小結找不到原始地址了
Mapping a Clob to a Stringhttp://www.hibernate.org/76.html
Using Clobs with Oracle and Hibernate 1.2

待絮

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Hibernate操作Clob類型完整版!

hibernate.cfg.xml 由於調試用，用的是JDBC連接方法，要使用連接池，請自行修改.
記得自己把數據庫地址和用戶名，祕密改下

cmpBszn.hbm.xml

抽象類AbstractcmpBszn.java

實體類cmpBszn

SessionManager管理類（這個是通用的，如果你要自己寫也可以）

Test_Work實際測試類

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Hibernate操作Clob類型完整版!

hibernate.cfg.xml 由於調試用，用的是JDBC連接方法，要使用連接池，請自行修改. 記得自己把數據庫地址和用戶名，祕密改下

cmpBszn.hbm.xml

抽象類AbstractcmpBszn.java

實體類cmpBszn

SessionManager管理類（這個是通用的，如果你要自己寫也可以）

Test_Work實際測試類

hibernate.cfg.xml 由於調試用，用的是JDBC連接方法，要使用連接池，請自行修改.
記得自己把數據庫地址和用戶名，祕密改下