Question

我不确定这是一个语法错误或我的IDE（Visual Studio）的问题，但我似乎无法insert into我已添加到项目中的表。

private void create_user_username_box_Leave(object sender, EventArgs e)
{
    // Add user/password to database when when someone leaves the area. 
    using (DbConnection connection = new SqlConnection(@"Server=localhost\SQLEXPRESS01;Database=master;Trusted_Connection=True;"))
    {
        connection.Open();

        using (DbCommand command = new SqlCommand("INSERT INTO [dbo].[information] (id, password) VALUES (@id, @pw);"))
        {
            command.Parameters.Add(new SqlParameter("@id", create_user_username_textbox.Text));
            command.Parameters.Add(new SqlParameter("@pw", create_user_password_textbox.Text));

            command.Connection = connection;
            command.ExecuteNonQuery();
        }                
    }                
}

当我离开文本框时，我似乎收到一条错误消息，说明

无效的对象名称'dbo.information'

实际上，在SQL Server中创建表是这样的：

CREATE TABLE [dbo].[information]
(
    [Id] NVARCHAR(50) NOT NULL PRIMARY KEY, 
    [password] NVARCHAR(50) NULL
)

那为什么这是一个错误的名字？

Answer 1

我认为这里的问题可能是连接字符串问题。

关闭此示例您使用的是本地数据库，这是我过去使用的示例连接字符串。

connectionString ="Data Source=.\SQLEXPRESS;Initial Catalog=MyDB;Integrated Security=True"

初始目录是数据库名称，integrated security = true表示对数据库使用Windows身份验证。

所以在你的例子中它看起来像这样：

connectionString ="Data Source=.\SQLEXPRESS;Initial Catalog=master;Integrated Security=True"/>

与评论中提到的其他人一样，不要再次在master数据库中创建表，而是始终创建一个新表。

另外需要注意的是，个人接触是查看configuration manager以便存储连接字符串，然后您可以从那里轻松调用连接字符串。

Answer 2

您正在使用连接字符串上的<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>HOME</title>  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous"> <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script> <link href="https://fonts.googleapis.com/css?family=Montserrat:200" rel="stylesheet"> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/animate.css/3.5.2/animate.min.css"> <link rel="stylesheet" type="text/css" href="style.css">    </head> <body> <nav class="navbar navbar-expand-lg sticky-top navbar-dark bg-dark"> <div class="d-flex align-items-center justify-content-between w-100"> <button class="navbar-toggler navbar-toggler-left x collapsed" type="button" data-toggle="collapse" data-target="#navbarText" aria-controls="navbarText" aria-expanded="false" aria-label="Toggle navigation"> <span class="icon-bar"></span> <span class="icon-bar"></span> <span class="icon-bar"></span> </button> <a class="navbar-brand mx-auto ml-lg-5" href="#"> <img src="https://getbootstrap.com/assets/brand/bootstrap-solid.svg" width="30" height="30" alt="Logo"> </a> </div> <div class="collapse navbar-collapse mr-lg-5" id="navbarText"> <ul class="navbar-nav ml-auto"> <li class="nav-item active mx-2 animated fadeInDown"> <a class="nav-link" href="#">HOME<span class="sr-only">(current)</span></a> </li> <li class="nav-item mx-2 animated fadeInDown"> <a class="nav-link" href="#">PROJECTS</a> </li> <li class="nav-item mx-2 animated fadeInDown"> <a class="nav-link" href="#">ABOUT</a> </li> <li class="nav-item mx-2 animated fadeInDown"> <a class="nav-link" href="#">CONTACT</a> </li> </ul> </div> </nav> <div> <p>Test</p> </div> <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br> <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br> <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br> <p>ffff</p> </body> </html>数据库。

您可以为自己的数据库更改master：

master

Server=localhost\SQLEXPRESS01;Database=master;Trusted_Connection=True;

SQL Server：无法插入表中？

2 个答案: