Hibernate操作Clob数据类型

在POJO字符串可以声明为一个大型对象java.lang.String要么java.sql.Clob种类。

当程序从数据库加载Clob数据的类型。负荷只有一个Clob数据的逻辑指针类型。我们需要通过使用Clob.getCaracterStream()方法Clob型的数据输入流之后才干获取大对象数据。

看以下详细代码

package dao;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.Reader;
import java.math.BigDecimal;
import java.sql.Clob;
import java.sql.SQLException;

import org.hibernate.LobHelper;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;

import entity.Clobtable;
import Factory.HibernateSessionFactory;

public class ClobDao {
private Session session = null;
private Transaction tran = null;
public ClobDao() {
session = HibernateSessionFactory.getSession();
}

public void saveClob(BigDecimal id,String content){
Clobtable ct = new Clobtable();
ct.setId(id);
LobHelper lh = session.getLobHelper();
ct.setContent(lh.createClob(content));
tran = session.beginTransaction();
try{
session.save(ct);
tran.commit();
System.out.println("插入成功！

");
}catch(Exception e){
tran.rollback();
System.out.println("插入失败");
}
}

public void getClob(BigDecimal id){
String hql = "from Clobtable where id = ?

";
Query query = session.createQuery(hql);
query.setBigDecimal(0, id);
Clobtable ct = (Clobtable) query.uniqueResult();
Clob clob = ct.getContent();
try {
Reader reader = clob.getCharacterStream();
BufferedReader br = new BufferedReader(reader);
String content = br.readLine();
System.out.println(content);
} catch (SQLException e) {
e.printStackTrace();
System.out.println("读取失败！");
} catch (IOException e) {
System.out.println("读取失败。");
}

}
}