java - 将 nvarchar 值 '....' 转换为数据类型 int 时转换失败

Question

我正在尝试在 JavaFx 中为我的表创建更新语句，但收到以下错误:

Conversion failed when converting the nvarchar value 'Ana' to data type int.

我在 SQL Server 中创建了表。在我的数据库中，只有年龄来自 int 类型，其他所有内容都是 String。

这是我的代码:

    public void handleUpdateAction(ActionEvent event) {
    String sql = "update users set name =?, age = ?, department=?, job=?,  contact = ? where userNo =?" ;
    try {

        String userNo = txt_userNo.getText();
        String name = txt_name.getText();
        double age = Double.valueOf(txt_age.getText());
        String department = txt_department.getText();
        String job = txt_job.getText();
        String contact = txt_contact.getText();
        p_stmt = con.prepareStatement(sql);



        p_stmt.setString(1, userNo);
        p_stmt.setString(2, name);
        p_stmt.setDouble(3, age);
        p_stmt.setString(4, department);
        p_stmt.setString(5, job);
        p_stmt.setString(6, contact);
        int i = p_stmt.executeUpdate();
        if (i == 1)  {
        }System.out.println("Data Updated Successfully");
        loadDataFromDatabase();

    }catch (Exception e) {
        e.printStackTrace();
    }
}

Answer 1

parameterIndex对于 Statement.setString表示参数标记 ? 的词汇顺序在查询中。所以userNo应该在最后。例如:

    public void handleUpdateAction(ActionEvent event) {
    String sql = "update users set name =?, age = ?, department=?, job=?,  contact = ? where userNo =?" ;
    try {

        String userNo = txt_userNo.getText();
        String name = txt_name.getText();
        double age = Double.valueOf(txt_age.getText());
        String department = txt_department.getText();
        String job = txt_job.getText();
        String contact = txt_contact.getText();
        p_stmt = con.prepareStatement(sql);

        p_stmt.setString(1, name);
        p_stmt.setDouble(2, age);
        p_stmt.setString(3, department);
        p_stmt.setString(4, job);
        p_stmt.setString(5, contact);
        p_stmt.setString(6, userNo);

        int i = p_stmt.executeUpdate();
        if (i == 1)  {
        }System.out.println("Data Updated Successfully");
        loadDataFromDatabase();

    }catch (Exception e) {
        e.printStackTrace();
        throw e;
    }
}