C# SQL语句在多行中抛出错误

为了防御性地准备我的问题，我在发布之前使用了谷歌、必应和斯塔科夫：-）。另外，我是MVC3新手，仍然在努力解决框架的语法复杂性

我在下面的代码块中的SQL语句中有一个错误，这让我感到非常困扰。语法似乎正确。我使用Select*From简化了SQL语句。。它可以很好地返回数据

此外，如果有更好的方法（不使用EF对象），请接受建议。我真的很喜欢看到SQL语句的灵活性和可控制性——或者那样，或者只是习惯于它作为习惯的一种形式：-）

提前谢谢

@using System.Data.SqlClient;
@using System.Configuration;

@{
    Layout = null;
}
@{
    SqlConnection cn = null;
    cn = new SqlConnection(ConfigurationManager.ConnectionStrings["sqlConn"].ToString());
    cn.Open();
   SqlCommand cmd = new SqlCommand((@"SELECT DISTINCT" +
                                    "tblSBT.sname," +
                                    "tblSBDetails.sid," + 
                                    "tblSBDetails.assignedtrack," + 
                                    "tblSBDetails.maxtrack," + 
                                    "tblSBDetails.currentvals," + 
                                    "tblSBDetails.maxvals," + 
                                    "tblSBDetails.lastupdated" +
                                    "FROM" +         
                                        "tblSBT (NOLOCK)" +
                                    "LEFT OUTER JOIN" +
                                        "tblSBDetails (NOLOCK)" +
                                    "ON" +
                                        "tblSBT.sid = tblSBDetails.sid" +                      
                                    "WHERE" +
                                    "tblSBDetails.lastupdated > DateADD(n, -5, GETDATE())"+
                                    "ORDER BY" +
                                    "tblSBT.sname" +), cn);

    var myreader = cmd.ExecuteReader();
}

---

您必须在字符串之间添加空格

SqlCommand cmd = new SqlCommand((@"SELECT DISTINCT " +
                                    "tblSBT.sname," +
                                    "tblSBDetails.sid," + 
                                    "tblSBDetails.assignedtrack," + 
                                    "tblSBDetails.maxtrack," + 
                                    "tblSBDetails.currentvals," + 
                                    "tblSBDetails.maxvals," + 
                                    "tblSBDetails.lastupdated" +
                                    " FROM" +         
                                        " tblSBT (NOLOCK)" +
                                    " LEFT OUTER JOIN" +
                                        " tblSBDetails (NOLOCK)" +
                                    " ON" +
                                        " tblSBT.sid = tblSBDetails.sid" +                      
                                    " WHERE" +
                                    " tblSBDetails.lastupdated > DateADD(n, -5, GETDATE())"+
                                    " ORDER BY" +
                                    " tblSBT.sname"), cn); 

不要连接字符串，因为您正在使用@

---

)

如果使用@符号，则不需要像现在这样连接字符串。当您连接这样的字符串时，这也不是编写这段代码的最有效方法

SqlConnection cn = null;
cn = new SqlConnection(ConfigurationManager.ConnectionStrings["sqlConn"].ToString());
cn.Open();
SqlCommand cmd = new SqlCommand((@"SELECT DISTINCT
        tblSBT.sname,
        tblSBDetails.sid,
        tblSBT.sname,
        tblSBDetails.sid, 
        tblSBDetails.assignedtrack,
        tblSBDetails.maxtrack,
        tblSBDetails.currentvals,
        tblSBDetails.maxvals,  
        tblSBDetails.lastupdated
        FROM    tblSBT (NOLOCK)
                    LEFT OUTER JOIN tblSBDetails (NOLOCK)
                        ON .sid = tblSBDetails.sid
        WHERE   tblSBDetails.lastupdated > DateADD(n, -5, GETDATE())
        ORDER BY    tblSBT.sname"), cn);

var myreader = cmd.ExecuteReader();

---

更好的调试方法是为整个SQL语句设置一个字符串变量=，然后将其复制并粘贴到SQL Server Mgmt Studio中。您可能已经看到代码一起运行，并确定了您的问题

另外，我认为你并不真正理解@符号在这里的用法。只有第一行“SELECT DISTINCT”被视为文本，其余要连接的字符串只是字符串，而不是字符串文本。实际上，在这种情况下，这根本不重要

你的意思可能是

SqlCommand cmd = new SqlCommand((@"SELECT DISTINCT 
                                tblSBT.sname,
                                tblSBDetails.sid,
                                tblSBDetails.assignedtrack,
                                tblSBDetails.maxtrack,
                                tblSBDetails.currentvals,
                                tblSBDetails.maxvals,
                                tblSBDetails.lastupdated
                                 FROM
                                     tblSBT (NOLOCK)
                                 LEFT OUTER JOIN
                                     tblSBDetails (NOLOCK)
                                 ON
                                     tblSBT.sid = tblSBDetails.sid                    
                                 WHERE
                                 tblSBDetails.lastupdated > DateADD(n, -5, GETDATE())
                                 ORDER BY
                                 tblSBT.sname"), cn); 

---

啊。我正在打印我的答案，然后把它贴了出来，就好像SO告诉我另一个答案已经贴出来一样。我花了足够长的时间，以至于我无法删除自己的答案。谢谢你的回答和澄清，Matt，我和其他人一样支持你。

SqlCommand cmd = new SqlCommand((@"SELECT DISTINCT 
                                tblSBT.sname,
                                tblSBDetails.sid,
                                tblSBDetails.assignedtrack,
                                tblSBDetails.maxtrack,
                                tblSBDetails.currentvals,
                                tblSBDetails.maxvals,
                                tblSBDetails.lastupdated
                                 FROM
                                     tblSBT (NOLOCK)
                                 LEFT OUTER JOIN
                                     tblSBDetails (NOLOCK)
                                 ON
                                     tblSBT.sid = tblSBDetails.sid                    
                                 WHERE
                                 tblSBDetails.lastupdated > DateADD(n, -5, GETDATE())
                                 ORDER BY
                                 tblSBT.sname"), cn);