mysql,sqlserver,oracle三种数据库的大对象存取

oracle的LONG RAW来代替它们.这样就可以象其它对象一样操作了:

create table tb_file(filename varchar2(255),filecontent LONG RAW);


import java.sql.*;
import java.io.*;

public class BlobTest {

static String driver = "oracle.jdbc.driver.OracleDriver";
static String url = "jdbc:oracle:thin:@localhost:1521:test";
static String user = "system";
static String passwd = "passwd";
public static void main(String[] args) throws Exception {
Connection conn = null;
try {
Class.forName(driver);
conn = DriverManager.getConnection(url, user, passwd);
int op = 1;
//插入
if (op == 0) {
PreparedStatement ps = conn.prepareStatement("insert into tb_file values (?,?)");
ps.setString(1, "aaa.exe");
InputStream in = new FileInputStream("d:/aaa.exe");
ps.setBinaryStream(2,in,in.available());
ps.executeUpdate();
ps.close();
}
else {
//取出
PreparedStatement ps = conn.prepareStatement("select * from tb_file where filename = ?");
ps.setString(1, "aaa.exe");
ResultSet rs = ps.executeQuery();
rs.next();
InputStream in = rs.getBinaryStream("filecontent");
System.out.println(in.available());
FileOutputStream out = new FileOutputStream("d:/bbb.exe");
byte[] b = new byte[1024];
int len = 0;
while ( (len = in.read(b)) != -1) {
out.write(b, 0, len);
out.flush();
}
out.close();
in.close();
rs.close();
ps.close();
}
}
catch (Exception ex) {
ex.printStackTrace(System.out);
}
finally {
try {
conn.close();
}
catch (Exception ex) {}
}
}
}

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