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分享搞定的 clob 字段存取的代码


  采用得是oracle9i数据库,jboss或weblogic。
  jdbc采用oracle9i自带的class12.jar
  -------------
  数据库结构:
  代码:
  
  create table sncparameters
  (
   id   number(19)               not null,
   sncid number(19),
   name  varchar2(255),
   value clob
  )
   --------------
  bo采用xdoclet建立的:
  代码:
  
  public class sncparameters extends baseobject
  {
  
    /**
     * returns the id.
     *
     * @return   long
     * @hibernate.id
     *     column = "id"
     *     type = "long"
     *     generator-class = "native"
     *     unsaved-value = "null"
     */
    public long getid()
    {
      return id;
    }
  
    /**
     *  sets the id attribute of the sncparameters object
     *
     * @param  id the new id value
     */
    public void setid(long id)
    {
      this.id = id;
    }
  
  
    /**
     * returns the name.
     *
     * @return   string
     *
     * @hibernate.property
     *     column = "name"
     *     type = "string"
     *     not-null = "true"
     *     unique = "false"
     */
  
    public string getname()
    {
      return name;
    }
  
    /**
     *  sets the name attribute of the sncparameters object
     *
     * @param  name the new name value
     */
    public void setname(string name)
    {
      this.name = name;
    }
  
    /**
     * returns the sncid.
     *
     * @return   long
     *
     * @hibernate.property
     *     column = "sncid"
     *     type = "long"
     *     not-null = "true"
     *     unique = "false"
     */
  
    public long getsncid()
    {
      return sncid;
    }
  
    /**
     *  sets the sncid attribute of the sncparameters object
     *
     * @param  sncid the new sncid value
     */
    public void setsncid(long sncid)
    {
      this.sncid = sncid;
    }
  
    /**
     * returns the values.
     *
     * @return   clob
     *
     * @hibernate.property
     *     column = "value"
     *     type = "clob"
     *     not-null = "true"
     *     unique = "false"
     */
  
    public clob getvalue()
    {
      return value;
    }
  
    /**
     *  sets the values attribute of the sncparameters object
     *
     * @param  values the new values value
     */
    public void setvalue(clob value)
    {
      this.value = value;
    }
    private long id;
    private long sncid;
    private string name;
    private clob value;
    private string valuestring;
    public string getvaluestring()
    {
      return valuestring;
    }
      public void setvaluestring(string valuestring)
    {
      this.valuestring = valuestring;
    }
  }
  
  注:valuestring并不映射到数据库的clob字段,只是方便需要使用这个bo的人用get、set 处理这个巨长的clob字段
  ------------
  xdoclet生成的xml文件:
  代码:
  
  <?xml version="1.0"?>
  
  <!doctype hibernate-mapping public
    "-//hibernate/hibernate mapping dtd 2.0//en"
    "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
  
  <hibernate-mapping>
    <class
      name="com.idncn.mc.bo.sncparameters"
      table="sncparameters"
      dynamic-update="false"
      dynamic-insert="false"
    >
  
      <id
        name="id"
        column="id"
        type="long"
        unsaved-value="null"
      >
        <generator class="native">
        </generator>
      </id>
  
      <property
        name="name"
        type="string"
        update="true"
        insert="true"
        column="name"
        not-null="true"
        unique="false"
      />
  
      <property
        name="sncid"
        type="long"
        update="true"
        insert="true"
        column="sncid"
        not-null="true"
        unique="false"
      />
  
      <property
        name="value"
        type="clob"
        update="true"
        insert="true"
        column="value"
        not-null="true"
        unique="false"
      />
    </class>
  
  </hibernate-mapping>
  
  --------------------
  insert的代码:
  代码:
  
    public list batchaddsncparameters(list sncparameterslist, long sncid) throws dbaccessexception
    {
      logger.entermethod();
      list ret = new arraylist();
      try
      {
        sess = getsession();
        if (sncparameterslist != null && sncparameterslist.size() > 0)
        {
          for (int i = 0; i < sncparameterslist.size(); i++)
          {
            sncparameters cp = (sncparameters) sncparameterslist.get(i);
            long newid = -1;
            if (cp != null)
            {
              sncparameters cpnew = new sncparameters();
              cpnew.setsncid(sncid);
              cpnew.setname(cp.getname());
              cpnew.setvalue(hibernate.createclob(" "));
              newid = ((long) sess.save(cpnew)).longvalue();
              sess.flush();
  
       sess.refresh(cpnew, lockmode.upgrade);
              string content = cp.getvaluestring();
  
              string appserver = system.getproperty("appserver", "jboss");
              if (!appserver.equalsignorecase("jboss"))
              {
                //weblogic
                oraclethinclob clob = (oraclethinclob) cpnew.getvalue();
                java.io.writer pw = clob.getcharacteroutputstream();
                pw.write(content);
                pw.flush();
                pw.close();
       }
              else
              {
                //jboss
                oracle.sql.clob clob = (oracle.sql.clob) cpnew.getvalue();
                java.io.writer pw = clob.getcharacteroutputstream();
                pw.write(content)

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