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POUpdating AuthorID From ComboBOX value
 

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  1. POUpdating AuthorID From ComboBOX value
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    <p>I have the following sql tables:</p> <p>Authors:</p> <pre><code>Id Name 2 John Smith </code></pre> <p>Books:</p> <pre><code>Id AuthorID Title 1 2 Shreak </code></pre> <p>I am trying to add more books to the books table through a GUI which has a drop down box to display the authors from the authors table and a textbox for entry of new book and a save button. The followiing is that correspond to the save button:</p> <pre><code>pprivate void save_bookActionPerformed(java.awt.event.ActionEvent evt) { try { String sql = "INSERT into books (AuthorId,Title) VALUES (?,?)"; pst = con.prepareStatement(sql); pst.setInt(1, author_name_combo.getSelectedItem()); pst.setString(2, book_name.getText()); pst.executeUpdate(); JOptionPane.showMessageDialog(null, "New Book has been added"); } catch (Exception e) { JOptionPane.showMessageDialog(null, e); } } private void FillCombo(){ try { con = DriverManager.getConnection(url, user, password); String sql = "SELECT * FROM Authors"; pst = con.prepareStatement(sql); rs = pst.executeQuery(); while(rs.next()) { String author = rs.getString("Name"); author_name_combo.addItem(author); } } catch (Exception e) { JOptionPane.showMessageDialog(null, e); } } </code></pre> <p>I am a beginner and im struggling to populate the table with new data. the progamme compiles but the books table display NULL for Both AUTHOR ID and TITLE. how do I populate the table correctly so that author Id is automatically looked up from Authors table and given the approprate id number from there. please note author id is foreign key in books table. </p>
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    1. PO
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    1. This table or related slice is empty.
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    1. USHoody
    1. USHoody
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
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      1. POUpdating AuthorID From ComboBOX value
      1. This table or related slice is empty.
      1. VTDownMod
    1. COConsider using a debugger or sprinkling your code with `System.out.println(someVariableThatYouWantToTestHere)` to see what is not working and where.
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      1. USHovercraft Full Of Eels
    2. COThe problem is eventually in data type incompatibility. Plz show us your table definition. Also to get the value of JCombobox use **getSelectedItem()**
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      1. POUpdating AuthorID From ComboBOX value
      1. USOuld Abba
    3. COgetSelectedItem() is not compatible with setInt
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      1. USHoody
 

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