Question

我做了一个Java论坛，我试图搜索我的sql表，当我点击按钮最后搜索它（人的名字）时，它出现了一个＆＃34;当前光标位置的无效操作＆＃34 ;错误。

这是我搜索按钮的代码。请帮我解决这个问题。

private void firstSearchActionPerformed(java.awt.event.ActionEvent evt) {                                            
    try{
        String fname = searchText.getText();
        Connection connect = DriverManager.getConnection("jdbc:derby://localhost:1527/Employees",
            "users", "admin");
        PreparedStatement pState = connect.prepareStatement("select * from WORKERS where First_Name = ?");
        pState.setString(1,fname);
        ResultSet rSet;
        rSet = pState.executeQuery();
        if(rs.next()){
            int id_col = rSet.getInt("Employee_ID");
            String id = Integer.toString(id_col);
            String first = rSet.getString("First_Name");
            String last = rSet.getString("Last_Name");
            String job = rSet.getString("Title");
            String hireDate = rSet.getString("Hire_Date");
            textID.setText(id);
            textFirstName.setText(first);
            textLastName.setText(last);
            textTitle.setText(job);
            textHireDate.setText(hireDate);
        }else{
            JOptionPane.showMessageDialog(null, "Not in Database");
        }
    }catch(SQLException err){
        JOptionPane.showConfirmDialog(employees.this, err.getMessage());
    }

}

Answer 1

    ResultSet rSet;
    rSet = pState.executeQuery();

而不是

    if(rs.next()){

使用

if(rSet.next()){

此处resultset对象为rSet而非rs

当前光标位置的操作无效

1 个答案: