JDBC学习笔记（三）大文本数据的读写

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();

JDBC学习笔记（三）大文本数据的读写

标签：span   数据保存   getchar   nload   大文本   获取   code   blog   mysql\