jdbc処理oracleのclobフィールドの詳細を解析します。
public class ClobUtil {
/**
*
* @param insertSQL sql clob , empty_clob() :insert into ba valus(1,empty_clob())
* @param updateSQL , . :select * from BA where ba_id = '"+ba.getBA_id()+"' for update
* @param con
* @param bigString clob
* @param updateColumn
* @return
* @throws SQLException
*/
public static Boolean clobInsert(String insertSQL,String updateSQL,Connection con,String bigString,String updateColumn ) throws SQLException{
//
ResultSet rs = null;
// sql
String query = insertSQL;
//
con.setAutoCommit(false);
//
java.sql.PreparedStatement pstmt = con.prepareStatement( query);
//
pstmt.executeUpdate();
//
pstmt = null;
//
query = updateSQL;
// select
pstmt = con.prepareStatement(query);
rs = pstmt.executeQuery();
//
if(rs.next())
{
// clob
oracle.sql.CLOB singnaturedateClob = (oracle.sql.CLOB)rs.getClob(updateColumn);
// clob
BufferedOutputStream out = new BufferedOutputStream(singnaturedateClob.getAsciiOutputStream());
//
if(bigString!=null){
try{
//
InputStream is = (InputStream)(new ByteArrayInputStream(bigString.getBytes()));
copyStream( is, out );
out.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
rs.close();
con.commit();
return true;
}
/**
*
* @param is
* @param os
* @throws IOException
*/
public static void copyStream( InputStream is, OutputStream os )
throws IOException
{
byte[] data = new byte[4096];
int readed = is.read(data);
while (readed != -1)
{
os.write(data,0,readed);
readed = is.read(data);
}
}
/**
* Clob
* @param c
* @return
*/
public static String getClobString(Clob c) {
try {
Reader reader=c.getCharacterStream();
if (reader == null) {
return null;
}
StringBuffer sb = new StringBuffer();
char[] charbuf = new char[4096];
for (int i = reader.read(charbuf); i > 0; i = reader.read(charbuf)) {
sb.append(charbuf, 0, i);
}
return sb.toString();
} catch (Exception e) {
return "";
}
}
}