clobimpl.java

来自「Speedframework--基于类型元数据的羽量级ORM.完全基于Java类」· Java 代码 · 共 95 行

package org.speedframework.entity;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.StringReader;
import java.io.Writer;
import java.sql.Clob;
import java.sql.SQLException;

/**
 * Clob 类型实现
 * @author lizf
 *
 */
public class ClobImpl implements Clob {
	
	private Reader reader;
	private int length;
	private boolean needsReset = false;

	public ClobImpl(String string) {
		reader = new StringReader(string);
		length = string.length();
	}

	public ClobImpl(Reader reader, int length) {
		this.reader = reader;
		this.length = length;
	}


	public long length() throws SQLException {
		return length;
	}

	public void truncate(long len) throws SQLException {

	}

	public InputStream getAsciiStream() throws SQLException {
		try {
			if (needsReset) reader.reset();
		}
		catch (IOException ioe) {
			throw new SQLException("could not reset reader");
		}
		needsReset = true;		
		return new ByteArrayInputStream(reader.toString().getBytes());
	}

	public OutputStream setAsciiStream(long pos) throws SQLException {
		return null;
	}

	public Reader getCharacterStream() throws SQLException {
		try {
			if (needsReset) reader.reset();
		}
		catch (IOException ioe) {
			throw new SQLException("could not reset reader");
		}
		needsReset = true;
		return reader;
	}

	public Writer setCharacterStream(long pos) throws SQLException {
		return null;
	}

	public String getSubString(long pos, int length) throws SQLException {
		return null;
	}

	public int setString(long pos, String str) throws SQLException {
		return 0;
	}

	public int setString(long pos, String str, int offset, int len)
			throws SQLException {
		return 0;
	}

	public long position(String searchstr, long start) throws SQLException {
		return 0;
	}

	public long position(Clob searchstr, long start) throws SQLException {
		return 0;
	}

}