Invalid column name in IMGSimilar

Question

Hi all,
I have a question for the function IMGSimilar.
I have a table musterbildsig, in which the generated signatures of 100 pictures are stored in the column msbild_sig. Each Signature in this table is to compare with all signatures in the column bild_signature of the table bildtable_intern_signature.
I use the following java code.
OracleResultSet rs_mbsig = (OracleResultSet) stmt.executeQuery("SELECT * FROM musterbildsig");
while (rs_mbsig.next()){
OrdImageSignature mbsig = (OrdImageSignature) rs_mbsig.getCustomDatum(2, OrdImageSignature.getFactory());
String str = "SELECT bsig.bild_id, ORDSYS.IMGScore(1) AS Score FROM bildtable_intern_signature bsig WHERE ORDSYS.IMGSimilar(bsig.bild_signature, mbsig, 'color=\"0,7\" texture=\"0,5\" location=\"0,1\"', (float)th, 1) = 1 ORDER BY Score asc";
OracleResultSet rs = (OracleResultSet) stmt.executeQuery(str);
But i get the error message: invalid column name.
I think, mbsig is wrong. But i don't know, how can i correct that?
Please help!
Thank you very much and greeting from germany!
rabbit

Answer 1

Hi,
I think you aren't able to use "mbsig" directly in your query string. Instead you should substitute it with "?" as follows.
String str = "SELECT bsig.bild_id, ORDSYS.IMGScore(1) AS Score FROM bildtable_intern_signature bsig WHERE ORDSYS.IMGSimilar(bsig.bild_signature, ?, 'color=\"0,7\" texture=\"0,5\" location=\"0,1\"', (float)th, 1) = 1 ORDER BY Score asc";
After you have to declare, what "?" is by:
OraclePreparedStatement stmt = (OraclePreparedStatement)conn.prepareStatement(str);
stmt.setCustomDatum(1, mbsig);
Now you can retrieve data with:
OracleResultSet rs = (OracleResultSet) stmt.executeQuery();
I hope it helps.
greetings from germany :)
Christian