SqlConnection.Credential属性

Question

所以我有一个登录页面，我必须实施验证：＆＃39;如果用户是＆＃34; sa＆＃34;然后它应该使用该用户凭据连接到数据库＆＃39;，这意味着我必须修改我的SqlConnection对象的凭据：

        if(username.Equals("sa", StringComparison.OrdinalIgnoreCase))
        {
            var securePassword = new System.Security.SecureString();
            foreach(char character in password)
            {
                securePassword.AppendChar(character);
            }

            securePassword.MakeReadOnly();
            var credentials = new SqlCredential(username, securePassword);
            sqlConn.Close();
            sqlConn.Credential = credentials;

            sqlConn.Open();

            return true;
        }

但即使该属性不是sqlConn.Credential = credentials;

，我也会在readonly中获得异常

InvalidOperationException：无法将Credential与UserID，UID，密码或PWD连接字符串关键字一起使用。

还有其他方法可以更改Credentials属性吗？

提前致谢。

Answer 1

或者您可以使用SqlConnectionStringBuilder，

string connectString = "Data source=.;initial catalog=yourDB; 
                        User Id=user; Password=password";
SqlConnectionStringBuilder builder = new SqlConnectionStringBuilder (connectString);
SqlConnection sqlConn= new SqlConnection(builder.ConnectionString);

然后在你的方法中，

 builder.Remove("User Id");
 builder.Remove("Password");
 // builder.Remove("integrated security"); if you had used
 sqlConn.ConnectionString = builder.ConnectionString;

Answer 2

SqlConnection.Credential属性

来自https://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlconnection.credential(v=vs.110).aspx

将引发InvalidOperationException异常：

如果在打开的连接上设置了凭据。
如果在Context Connection = true时设置了Credential。
如果在Integrated Security = true时设置了Credential。
如果连接字符串使用密码时设置了凭据。
如果连接字符串使用UserID时设置了Credential。

Answer 3

如果SqlConnection有用户名和密码，您似乎可以修改凭据。我使用this教程的示例来使其工作：

        if (username.Equals("sa", StringComparison.OrdinalIgnoreCase))
        {
            using (SqlConnection conn = new SqlConnection(string.Format("Server={0};Initial Catalog={1};", sqlConn.DataSource, sqlConn.Database)))
            {
                var securePassword = new System.Security.SecureString();
                foreach (char character in password)
                {
                    securePassword.AppendChar(character);
                }

                securePassword.MakeReadOnly();

                var credentials = new SqlCredential(username, securePassword);
                conn.Credential = credentials;

                conn.Open();

                return true;
            }
        }

由于我无法修改Credential属性，因此我在SqlConnection username password内没有connectionString和Credential 。这样我可以稍后添加新的ORA-06512: at line 2 06502. 00000 - "PL/SQL: numeric or value error%s" *Cause: An arithmetic, numeric, string, conversion, or constraint error occurred. For example, this error occurs if an attempt is made to assign the value NULL to a variable declared NOT NULL, or if an attempt is made to assign an integer larger than 99 to a variable declared NUMBER(2). *Action: Change the data, how it is manipulated, or how it is declared so that values do not violate constraints. No Erro。希望这可以帮助其他任何面临类似问题的人。

更改SqlConnection，Credentials属性

3 个答案:

SqlConnection.Credential属性