錯誤在Java更新

Question

if (e.getSource() == btn_updt) { 
     try { 

      String str = "img"; 

      int max_avail; 

      double price; 

      Frame f = new Frame(); 

      Connection con; 

      DriverManager 
        .registerDriver(new sun.jdbc.odbc.JdbcOdbcDriver()); 

      Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); 

      con = DriverManager.getConnection("jdbc:odbc:dsnproj", "", ""); 

      Statement s = con.createStatement(); 

      // int mno=Integer.parseInt(txt_contcno.getText()); 

      price = Double.parseDouble(txt_price.getText()); 

      max_avail = Integer.parseInt(txt_qty_avl.getText()); 

      String qry_up = "update category set prod_name='" 
        + txt_pro_nm.getText() + "',desc='" 
        + txt_pro_desc.getText() + "',photo='" + str 
        + "',max_quan_avail=" + max_avail + ",cur_price=" 
        + price + ",per='" + ch_weight.getSelectedItem() 
        + "' where p_name='" + ch_pro_nm.getSelectedItem() 
        + "'"; 

      System.out.println(qry_up); 

      s.execute(qry_up); 

      System.out.println("updated"); 

      // JOptionPane.showMessageDialog(f, 
      // "Updates Successfully : ","A plain message",JOptionPane.PLAIN_MESSAGE); 
     } catch (Exception ae) { 
      System.out.println(ae.getLocalizedMessage()); 
     } 

     return result; 
    } 

和我得到的錯誤爲：

update category set prod_name='jjhhj',desc='jjjh',photo='img',max_quan_avail=88,cur_price=99.0,per='piece' where p_name='brush' [Microsoft][ODBC Microsoft Access Driver] Syntax error in UPDATE statement. 

請幫我...

Answer 1

由於DESC是一個關鍵字，你必須[]圍繞着它。

使用此爲您的查詢：

String qry_up = "update category set prod_name='" 
        + txt_pro_nm.getText() + "',[desc]='" 
        + txt_pro_desc.getText() + "',photo='" + str 
        + "',max_quan_avail=" + max_avail + ",cur_price=" 
        + price + ",per='" + ch_weight.getSelectedItem() 
        + "' where p_name='" + ch_pro_nm.getSelectedItem() 
        + "'";