Question

ad.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {
            String name = txtnm.getText();
            String cnm = Integer.toString(id)+name;
            try {
                System.out.print(cnm);

                st = con.createStatement();  // st is an object of Statement class
                int result = st.executeUpdate("alter table emp_att add ("+cnm+" varchar(30))"); //how to pass coloumn name in sql query

                if(result !=0)
                {
                    JOptionPane.showMessageDialog(null, "Table Altered");
                }
                else
                {
                    JOptionPane.showMessageDialog(null, "Something Went Wrong..");
                }

            }
            catch (Exception e) 
            {
                System.out.println("Error : " + e);
            }
        }
    });

在上面的代码中我尝试在按钮单击时添加列，但发生SQLException并给出eroor作为ORA-00904 ::无效标识符如何解决此问题

Answer 1

ORA-00904告诉您列的名称无效。这是规则：

它不能保留oracle word;
必须以字母开头;
小于或等于30个字符;
仅包含字母数字和特殊字符;

由于您的列名称以数字而非字母开头，您会收到此错误

我想在按钮点击时在oracle表中添加一列

1 个答案: