在java 中处理oracle中的大对象

（CLOB和BLOB数据类型）：

importjava.io.BufferedReader;
importjava.io.BufferedWriter;
importjava.io.File;
importjava.io.FileInputStream;
importjava.io.FileNotFoundException;
importjava.io.FileReader;
importjava.io.OutputStream;
importjava.io.Writer;
importjava.sql.Connection;
importjava.sql.PreparedStatement;
importjava.sql.ResultSet;
importjava.sql.SQLException;

importoracle.sql.BLOB;
importoracle.sql.CLOB;

publicclassTest...{

/***//**
*@paramargs
*/
publicstaticvoidmain(String[]args)...{
//TODOAuto-generatedmethodstub
System.out.println("ProcessStart...");

testClob();
}

publicstaticvoidtestClob()...{
Connectioncon=null;
PreparedStatementpst=null;
ResultSetrs=null;

Stringstrsql="truncatetabletest";
Stringstrsql1="insertintotestvalues('test',empty_clob(),empty_blob())";
Stringstrsql2="updatetestsetbigobject1=?,bigobject2=?wheretestid=?";
Stringstrsql3="select*fromtestwheretestid='test'forupdate";
StringstrLong=StringLong.strLong;

System.out.println("strLong.length():"+strLong.length());
//Filefile=newFile("E:/pic/2006_10_02/IMG_0087.JPG");
Filefile=newFile("D:/2007.wmv");

con=ConnDB.getConnection66();

try...{
con.setAutoCommit(false);

pst=con.prepareStatement(strsql);
pst.executeUpdate();

pst=con.prepareStatement(strsql1);
pst.executeUpdate();

pst=con.prepareStatement(strsql3);
rs=pst.executeQuery();

while(rs.next())...{

longstime=System.currentTimeMillis();

BLOBbb=(BLOB)rs.getBlob(3);
CLOBcb=(CLOB)rs.getClob(2);

/***//************************CLOBReaderString*************************/
Writerwt=cb.getCharacterOutputStream();
wt.write(strLong);
wt.flush();
wt.close();
/***//************************CLOBReaderString*************************/

/***//************************CLOBReaderFile*************************/
//BufferedWriterbw=newBufferedWriter(cb.getCharacterOutputStream());
//BufferedReaderbfr=newBufferedReader(newFileReader("D:/test.txt"));
//intread=0;
//while((read=bfr.read())!=-1){
//bw.write(read);
//}
//bw.flush();
//bw.close();
/***//************************CLOBReaderFile*************************/


/***//************************BLOBReaderFile*************************/
OutputStreamoutstrm=bb.getBinaryOutputStream();
FileInputStreaminpstrm=newFileInputStream(file);
byte[]buffer=newbyte[inpstrm.available()];
inpstrm.read(buffer);
outstrm.write(buffer);
outstrm.flush();
inpstrm.close();
outstrm.close();
/***//************************BLOBReaderFile*************************/

pst=con.prepareStatement(strsql2);
pst.setClob(1,cb);//Clob
pst.setBlob(2,bb);//Blob
pst.setString(3,"test");
pst.executeUpdate();

longetime=System.currentTimeMillis();

System.out.println("ExecuteTime:"+(etime-stime)/1000.0);

}
con.commit();

/***//************************OutputCLOBStringFromDB*************************/
pst=con.prepareStatement("select*fromtest");
rs=pst.executeQuery();
if(rs.next())...{
CLOBclb=(CLOB)rs.getClob(2);
BufferedReaderbr=newBufferedReader(clb.getCharacterStream());
Strings=br.readLine();
while(s!=null)...{
System.out.println(s);
s=br.readLine();
}
br.close();
}
/***//************************OutputCLOBStringFromDB*************************/

System.out.println("ProcessEnd!");

}catch(SQLExceptione)...{
//TODOAuto-generatedcatchblock
e.printStackTrace();
}catch(FileNotFoundExceptione1)...{
//TODOAuto-generatedcatchblock
e1.printStackTrace();
}catch(Exceptionex)...{
ex.printStackTrace();
}finally...{
try...{
pst.close();
con.close();
}catch(SQLExceptione)...{
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
}
}
}