Java - How to get Column name on Result Set [duplicate]

Question

Hello I'm trying to make an error when there is no matched student... and it will display like this No matching records found and I want the column name still the same but still not figuring it out... can some one tell me if this is right??

Heres my function for that... and I add comment there where I put the error... but i don't know how to get the columnname

public void SearchTableStudent() {
        String tempSearchValue = searchStudent.getText().trim();
        boolean empty = true;
        sql = "SELECT student_id as 'Student ID',"
                + "concat(lastname, '  ,  ', firstname, ' ', middlename) as 'Name'"
                + "FROM user "
                + "WHERE CAST(student_id as CHAR) LIKE '%" + tempSearchValue + "%'";
        try {
            pst = conn.prepareStatement(sql);
            rs = pst.executeQuery();
            while(rs.next()) {
                table.setModel(DbUtils.resultSetToTableModel(rs));
                empty = false;
            }
            if(empty) {
                String error = "";
                table.setModel(new javax.swing.table.DefaultTableModel(
                    new Object [][] {
                        {"No matching records found",null}
                    },
                    new String [] {
     /** I WANT TO PUT THE SAME COLUMN NAME ON MY DATABASE SELECTED BUT DON't Know
 WHAT FUNCTION TO DO*/
                    }
                ));
            }
        } catch (Exception e) {
            JOptionPane.showMessageDialog(null, e.getMessage());
        }
    }

I try like this but still gave me NULL!!! this code is below of empty = false;

for(int i=0; i<table.getColumnCount(); i++) {
    test[i] = table.getColumnName(i);
}

Answer 1

ResultSetMetaData metaData = resultSet.getMetaData();
int count = metaData.getColumnCount(); //number of column
String columnName[] = new String[count];

for (int i = 1; i <= count; i++)
{
   columnName[i-1] = metaData.getColumnLabel(i);
   System.out.println(columnName[i-1]);
}

Answer 2

Try this.

      ResultSetMetaData meta = resultset.getMetaData(); 

      Integer columncount = meta.getColumnCount();

      int count = 1 ; // start counting from 1 always

      String[] columnNames = new String[columncount];

      while(count<=columncount){

         columnNames [count-1] = meta.getColumnLabel(count);
         count++;

      }

Since here your expecting is to get the columns alias instead of column name, so you have to use ResultSetMetaData.getColumnLabel instead of ResultSetmetaData.getColumnName.

Answer 3

Get ResultSetMetaData using ResultSet#getMetaData():

ResultSetMetaData meta = rs.getMetaData();

And then to get column name of 1st column:

String col1Name = meta.getColumnLabel(1);

Similarly to get column name of 2nd column:

String col2Name = meta.getColumnLabel(2);