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();
时间: 2024-08-04 08:37:26