一、用JDBC向数据库插入大文本数据
String sql = "insert into my_clob values (null, ?)"; ps = conn.prepareStatement(sql); File f = new File("D:\\BaiduNetdiskDownload\\mysql\\jdbc.sql"); Reader reader = new BufferedReader(new FileReader(f)); ps.setCharacterStream(1, reader , f.length()); int res = ps.executeUpdate(); System.out.println(res); reader.close();
二、从数据库读取大文本数据写入到文件中
方式一：直接把数据保存到字符串中
String big_text = rs.getString("bit_text");
File f = new File("D:\\BaiduNetdiskDownload\\mysql\\jdbc.bak.sql");
Writer wt = new FileWriter(f);
wt.write(big_text);
wt.close();
方式二：通过ResultSet对象rs获取输入流读取数据，创建输出流写到文件
Reader rd = rs.getCharacterStream("bit_text"); File f = new File("D:\\BaiduNetdiskDownload\\mysql\\jdbc.bak.sql"); Writer wt = new FileWriter(f); char[] buff = new char[1024];
int i = 0;
while ((i = rd.read(buff)) != -1)
{
wt.write(buff, 0, i);
}
wt.close();
rd.close();
方式三、通过Clob对象获取输入流
cb = rs.getClob("bit_text");
Reader rd = cb.getCharacterStream(); File f = new File("D:\\BaiduNetdiskDownload\\mysql\\jdbc.bak.sql");
Writer wt = new FileWriter(f);
char[] buff = new char[1024];
int i = 0;
while ((i = rd.read(buff)) != -1)
{
wt.write(buff, 0, i);
}
wt.close();
rd.close();
原文：http://www.cnblogs.com/pengyin/p/6407259.html