异常"SqlConnection无效的列名'False'

Question

我在语句中遇到异常无效的列名'False'

reader = cmd.ExecuteReader(CommandBehavior.SingleRow);

我理解这可能与SQL的布尔类型是"位"并且它没有转换false为有关0.你如何缓解这个问题,或者这个问题在这里？

    public override bool ValidateUser(string username, string password)
    {
        bool isValid = false;

        SqlConnection conn = new SqlConnection(connectionString);
        SqlCommand cmd = new SqlCommand("SELECT Password, IsApproved FROM Users" +
                " WHERE Email = @Email AND ApplicationName = @ApplicationName AND IsLockedOut = False", conn);

        cmd.Parameters.Add("@Email", SqlDbType.NVarChar, 128).Value = username;
        cmd.Parameters.Add("@ApplicationName", SqlDbType.NVarChar, 255).Value = m_ApplicationName;

        SqlDataReader reader = null;
        bool isApproved = true;
        string pwd = "";

        try
        {
            conn.Open();

            reader = cmd.ExecuteReader(CommandBehavior.SingleRow);

            if (reader.HasRows)
            {
                reader.Read();
                pwd = reader.GetString(0);
                isApproved = reader.GetBoolean(1);
            }
            else
            {
                return false;
            }

            reader.Close();

            if (CheckPassword(password, pwd))
            {
                if (isApproved)
                {
                    isValid = true;

                    SqlCommand updateCmd = new SqlCommand("UPDATE Users SET LastLoginDate = @LastLoginDate" +
                                                            " WHERE Email = @Email AND ApplicationName = @ApplicationName", conn);

                    updateCmd.Parameters.Add("@LastLoginDate", SqlDbType.DateTime).Value = DateTime.Now;
                    updateCmd.Parameters.Add("@Email", SqlDbType.NVarChar, 255).Value = username;
                    updateCmd.Parameters.Add("@ApplicationName", SqlDbType.NVarChar, 255).Value = m_ApplicationName;

                    updateCmd.ExecuteNonQuery();
                }
            }
            else
            {
                conn.Close();

                UpdateFailureCount(username, "password");
            }
        }

Answer 1

使用IsLockedOut =0用于检查错误.

IsLockedOut是一个位数据类型的字段,存储0表示false,1表示true表示.

所以在查询中使用相同/

如果IsLockedOut是varchar字段,则IsLockedOut='False'在比较字符串比较时使用.