stringclobtype.java

J2EE架构的权限系统

/*
 * 创建日期 2005-8-30
 *
 * TODO 要更改此生成的文件的模板，请转至
 * 窗口 － 首选项 － Java － 代码样式 － 代码模板
 */
package org.infosys.util;

import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;

import net.sf.hibernate.UserType;
import net.sf.hibernate.HibernateException;


/**
 * @author Administrator
 * oracle-clob字段处理类
 */
public class StringClobType implements UserType{
    public int[] sqlTypes()
    {
        return new int[] { Types.CLOB };
    }

    public Class returnedClass()
    {
        return String.class;
    }

    public boolean equals(Object x, Object y)
    {
        return (x == y)
            || (x != null
                && y != null
                && (x.equals(y)));
    }

	public Object nullSafeGet(ResultSet rs, String[] names, 
			Object owner) throws HibernateException, SQLException {
		Reader reader = rs.getCharacterStream(names[0]);
		if (reader == null)	return null;

		StringBuffer sb = new StringBuffer();
		try {
			char[] charbuf = new char[4096];
			for (int i = reader.read(charbuf); i > 0; i = reader.read(charbuf))	{
				sb.append(charbuf, 0, i);
			}
		}
		catch (IOException e) {
			throw new SQLException( e.getMessage() );
		}
		return sb.toString();
	}

	public void nullSafeSet(PreparedStatement st, Object value, int index) throws HibernateException, SQLException {
		if (value != null) {
			StringReader r = new StringReader( (String) value );
			st.setCharacterStream( index, r, ((String) value).length() );
		} else {
			st.setNull(index, sqlTypes()[0]);
		}
	}

    public Object deepCopy(Object value)
    {
        if (value == null) return null;
        return new String((String) value);
    }

    public boolean isMutable()
    {
        return false;
    }
}