Convert Resultset to CSV file using Java

Question

Hi I am trying to convert oracle jdbc resultset to csv file. Below is the code used. Issue occures when there is value like below in the field. It deforms the output csv and all this come in separate line rather than in one field.

Value in Field comes in csv as

[<333message:Runtime error in script' ProcessItem: ' Type: 'ITEM'" 1:0).Internal Script error: java.lang.NullPointerException
Script (line 1):
setHours = 0 ;
if(ts.instanceId == null)
" 3 : ts.instanceId = 0 ;"
Step >]

int ncols = result.getMetaData().getColumnCount();  

            System.out.println("ColumnCout"+ncols);  
            FileOutputStream fos=new FileOutputStream(new File("C:\\test.csv"),false);  
            Writer out = new OutputStreamWriter(new BufferedOutputStream(fos),"UTF_8");      

            for (int j=1; j<(ncols+1); j++) {     
            out.append(result.getMetaData().getColumnName (j));       
            if (j<ncols) out.append(","); else out.append("\r\n");      
            }   
            int m =1;    

            while (result.next()) {   

            for (int k=1; k<(ncols+1); k++) {   

            out.append(result.getString(k));    

            if (k<ncols) out.append(","); else out.append("\r\n");    
            }   
            //System.out.println("No of rows"+m);   
            m++;   
            }  

Answer 1

Are you using "java.sql.ResultSet" class? If yes, see the library in this link http://opencsv.sourceforge.net/

See an example:

CSVWriter csvWriter = new CSVWriter(new FileWriter("yourfile.csv"), '\t');
java.sql.ResultSet myResultSet = .... ;
csvWriter.writeAll(myResultSet, includeHeaders);

Answer 2

Get the value for the column that could have new lines as

String multiLine = null;
if (k == <col_index> && (mutiLine = rs.getString(k)) != null)
    out.append(multiLine.replaceAll("\\n", ""));
else
    out.append(result.getString(k));

You could filter all the columns as well but then would incur some performance hit.