Reading Excel files in Java --

Question

Hi,
I am trying to read an excel file from Java. It only reads the column, but I want to print the rows, which intersect with the SQL query. The following source displays only values of a column. No problem, but I would like to see the corresponding row numbers or simply number of rows. Can anyone suggest me what to do ASAP?
Thanks,
Gunter
import java.io.*;
import java.sql.*;
import java.util.*;
public class ExcelReadTest1{
public static void main(String[] args){
Connection connection = null;
try{
//Vector vector = new Vector();
String myString="";
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con = DriverManager.getConnection( "jdbc dbc ata-list" );
Statement st = con.createStatement();
ResultSet rs = st.executeQuery( "Select caseid from [sa3$] where iSchool=2" );
//ResultSet rs = st.executeQuery( "Select * from [Sheet1$]" );
ResultSetMetaData rsmd = rs.getMetaData();
int numberOfColumns = rsmd.getColumnCount();
int row_num=1;
while ((rs !=null) && rs.next()) {
myString += "\n Row " + row_num++ + " ";
for (int i = 1; i <= numberOfColumns; i++)
//myString += "\n " + rsmd.getColumnName(i);
myString += " : " + rs.getString(i);
System.out.println(myString);
if (i >1)
System.out.print(", ");
String columnValue = rs.getString(i);
System.out.print(" " + columnValue);
System.out.println("");
st.close();
con.close();
} catch(Exception ex) {
System.err.print("Exception: ");
System.err.println(ex.getMessage());

Answer 1

I took your code and reworked it to access a little database I keep of students at a small private school where my wife works. The Student table has columns "studentID", "firstname", "lastname", and "gradyear".
Running your code for the output got the following. I cut and pasted the output after it had run through the first 4 students, so you can see what it's doing.
Row 1 : 1
1
Row 1 : 1 : Audrey
, Audrey
Row 1 : 1 : Audrey : Budington
, Budington
Row 1 : 1 : Audrey : Budington : 2015
, 2015
Row 1 : 1 : Audrey : Budington : 2015
Row 2 : 2
2
Row 1 : 1 : Audrey : Budington : 2015
Row 2 : 2 : Cecilia
, Cecilia
Row 1 : 1 : Audrey : Budington : 2015
Row 2 : 2 : Cecilia : DeRigo
, DeRigo
Row 1 : 1 : Audrey : Budington : 2015
Row 2 : 2 : Cecilia : DeRigo : 2015
, 2015
Row 1 : 1 : Audrey : Budington : 2015
Row 2 : 2 : Cecilia : DeRigo : 2015
Row 3 : 3
3
Row 1 : 1 : Audrey : Budington : 2015
Row 2 : 2 : Cecilia : DeRigo : 2015
Row 3 : 3 : Serena
, Serena
Row 1 : 1 : Audrey : Budington : 2015
Row 2 : 2 : Cecilia : DeRigo : 2015
Row 3 : 3 : Serena : Downes
, Downes
Row 1 : 1 : Audrey : Budington : 2015
Row 2 : 2 : Cecilia : DeRigo : 2015
Row 3 : 3 : Serena : Downes : 2015
, 2015
Row 1 : 1 : Audrey : Budington : 2015
Row 2 : 2 : Cecilia : DeRigo : 2015
Row 3 : 3 : Serena : Downes : 2015
Row 4 : 4
4
Row 1 : 1 : Audrey : Budington : 2015
Row 2 : 2 : Cecilia : DeRigo : 2015
Row 3 : 3 : Serena : Downes : 2015
Row 4 : 4 : Dylan
, Dylan
Row 1 : 1 : Audrey : Budington : 2015
Row 2 : 2 : Cecilia : DeRigo : 2015
Row 3 : 3 : Serena : Downes : 2015
Row 4 : 4 : Dylan : Gellert
, Gellert
Row 1 : 1 : Audrey : Budington : 2015
Row 2 : 2 : Cecilia : DeRigo : 2015
Row 3 : 3 : Serena : Downes : 2015
Row 4 : 4 : Dylan : Gellert : 2015
, 2015
You need to figure out the flow of the thing and your println() calls and your looping. Eventually if you straighten it out you will get something like
Row 1 : 1 : Audrey : Budington : 2015
Row 2 : 2 : Cecilia : DeRigo : 2015
Row 3 : 3 : Serena : Downes : 2015
Row 4 : 4 : Dylan : Gellert : 2015
Row 5 : 5 : Benjamin : Miller : 2015
Row 6 : 6 : Timothy : Bolan : 2014
Row 7 : 7 : Javin : deMello-Folsom : 2014
Row 8 : 8 : Elizabeth : Eppolito : 2014
Row 9 : 9 : Harrison : Evans : 2014
Row 10 : 10 : Emily : Fay : 2014
*** etc***
which is what you want, isn't it?