用eclipse从数据库中读取一个文本。能不能给解释一下从rs.next（）之后的代码，看不懂。。。

Question

public void readtext() throws Exception{
Connection con = DBfactory.getConnection();
Statement st =con.createStatement();
ResultSet rs = st.executeQuery("select * from note where id =101");
rs.next();
InputStream in = rs.getAsciiStream("content");
byte [] bs = new byte[1024];
int len = 0;
while((len=in.read(bs))!=-1){
String str = new String(bs, 0, len);
System.err.print(str);

执行成功了，文件也读取出来了，就是以下的代码不知道什么意思
     InputStream in = rs.getAsciiStream("content");
 byte [] bs  = new byte[1024];
 int len = 0;
 while((len=in.read(bs))!=-1){
     String str = new String(bs, 0, len);
     System.err.print(str);

Answer 1

存取大字符串和二进制文本
对于数据库中longvarchar和langvarbinary进行流操作
ResultSet rs=stmt.executeQueryString("select ...");
BufferedReader br=new BufferedReader(new InputStream(rs.getAsciiStream("vol1")));//长文本串
BufferedReader br=new BufferedReader(new InputStream(rs.getUnicodeStream("vol1")));
BufferedReader br=new BufferedReader(new InputStream(rs.getBinaryStream("vol2")));//长二进制文本