表格名称附近的C#语法错误 [英] C# Syntax Error Near Table Name

问题描述

尝试检查C#中3层项目的登录凭据时遇到问题.

I am having some problem when trying to check login credential for 3-tier project in C#.

当前，我有一个名为User的表，其中包含userName和password列.

Currently, I have a table named User with userName and password columns.

在我的BusinessLogicLayer中，我得到用户输入并将其传递给dataAccessLayer:

In my BusinessLogicLayer, I get the user input and pass them to dataAccessLayer:

public string checkCredential(string userName, string password)
{
    string returnMessage = "";
    User user = new User(userName, password);
    Boolean success = user.checkCredential();
    if (!success)
    {
        returnMessage += "Username and password does not match!";
    }
    else
    {
        returnMessage = "";
    }
    return returnMessage;
}

在我的数据访问层中，我有一种方法来检查登录凭据:

In my Data Access Layer, I got a method to check for login creddential:

public Boolean checkCredential()
{
    Boolean result = false;

    using (var connection = new SqlConnection(FFTHDb.connectionString)) // get your connection string from the other class here
    {
        SqlCommand command = new SqlCommand("SELECT userName, password FROM User WHERE userName = '" + userName + "' AND password = '" + password + "'", connection);
        connection.Open();
        using (var dr = command.ExecuteReader())
        {
            if (dr.Read())
            {
                result = true;
            }
        }
    }
    return result;
}

然后我得到了一个单独的类来设置连接字符串:

And I got a separated class to set the connection string:

public static string connectionString = DataAccessLayer.Properties.Settings.Default.DBConnStr;


public static SqlDataReader executeReader(string query)
{
    SqlDataReader result = null;

    System.Diagnostics.Debug.WriteLine("FFTHDb executeReader: " + query);

    SqlConnection connection = new SqlConnection(connectionString);
    SqlCommand command = new SqlCommand(query, connection);
    connection.Open();
    result = command.ExecuteReader();
    connection.Close();

    return result;
}

没有编译错误.我仔细检查了数据库中的表名和列.但是，它只是一直告诉我用户附近有语法错误.我不知道为什么会这样.

There is no compilation errors. And I double checked for the table name and columns in database. However, it just keeps telling me that there is syntax error near User. I wonder why is it so.

谢谢.

推荐答案

User是 保留关键字 .您应该将其与方括号(例如[User]

还使用 参数化查询 总是一个好习惯.

Also using parameterized queries always a good practice.

并且永远不要以纯文本形式存储密码！！请使用 SHA-512哈希.

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