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trouble with SQL statement in code

annie613
annie613 asked
on
Medium Priority
223 Views
Last Modified: 2010-07-27
here is my code
 public void transSpanish()
  {
    if (comboSpanish.getSelectedItem().equals(spanWrd))
    System.out.println("hi im: " +spanWrd);//test for now
    {
        jTextArea1.setText(""+ spanWrd +" translates to the english ");//just to see in text area for now
        try
        {
            //connection to DB
            Connection con = DriverManager.getConnection(url, user, password);
            Statement stmt = con.createStatement();
            ResultSet rs = stmt.executeQuery("SELECT English from translator WHERE Spanish="+spanWrd);        
            while (rs.next())
            {
                int col = 0;
                String English = rs.getString("English");
               //pulls from DB and translates word from spanish to english
                jTextArea1.setText("" + English);
            }//end while

            stmt.close();
            con.close();
        }//end try
        catch (Exception e)
        {
            System.out.println(e);
        }//end catch
       
    }//end if spanWrd    

my table is called translator
my Primarykey is wordID
the other fields are (wordID, Category, English, Spanish, Categoría)

this function works....fine...all i want to do in the first function is take the spanish word from the choice box
and compare it to the table then in the textArea show the english word.... ???? any comment :)
im getting sometype of error...missing parameter...


//this function works
public void viewWords()
      {
          //Set string array to the column headers
          String columnheaders[] = {"Category", "English", "Spanish", "Categoría"};
          
          int row = 2; //start at row two on table
          
        tblWords.setFont(new Font("Dialog", 0, 10));
        tblWords.setEnabled(false);
               
        // show column headers        
        for (int i=0; i<columnheaders.length; i++)
        tblWords.setValueAt(columnheaders[i], 0, i);
          
          try
        {
            Connection con = DriverManager.getConnection(url, user, password);
            Statement stmt = con.createStatement();
            ResultSet rs = stmt.executeQuery("SELECT Category, English, Spanish, Categoría  FROM translator");
           
            while (rs.next())
            {
                //Get information from database to variables
                int col = 0;
                String Category = rs.getString("Category");
                String English = rs.getString("English");
                String Spanish = rs.getString("Spanish");
                String Categoría = rs.getString("Categoría");
               
               
                tblWords.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
               
                //Print information out in a row
                tblWords.setValueAt(Category, row, col);
                col++;
                tblWords.setValueAt(English, row, col);
                col++;                
                tblWords.setValueAt(Spanish, row, col);
                col++;
                tblWords.setValueAt(Categoría, row, col);          
                row++;
            }//while

            stmt.close();
            con.close();
        }//try
        catch (Exception e)
        {
            System.out.println(e);
        }//catch
      }//viewWords()
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can you print the stack trace? please
Ghost
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Top Expert 2016

Commented:
>>ResultSet rs = stmt.executeQuery("SELECT English from translator WHERE Spanish="+spanWrd);        

should be

ResultSet rs = stmt.executeQuery("SELECT English from translator WHERE Spanish='"+spanWrd + "'");        
you need to suround the java variables with ' and '
ResultSet rs = stmt.executeQuery("SELECT English from translator WHERE Spanish="'+spanWrd+'");    

as you working with a varchar field
oops mine is still wrong,  Objects and CEHJ's are correct....
Or better yet, use a PreparedStatement and not worry about quoting!

            PreparedStatement stmt = con.prepareStatement("SELECT English from translator WHERE Spanish=?");
            stmt .setString(1, spanWrd);
            ResultSet rs = stmt.executeQuery();
CERTIFIED EXPERT
Top Expert 2016

Commented:
Yes, better to use a PreparedStatement and also a good idea to manipulate the table through its model, not through the gui as appears to be happening at the moment

Author

Commented:
ok the first thing i tried worked
objects suggested
ResultSet rs = stmt.executeQuery("SELECT English from translator WHERE Spanish='"+spanWrd+"'");

and that was my problem
single quotes :)
thanks again
cheers!
Mick BarryJava Developer
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Top Expert 2010

Commented:
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