调用存储过程不返回任何内容

Question

我正在像这样在 sql server 上调用一个存储过程：

SqlConnection conn = new SqlConnection();
SqlCommand cmd;
XmlDocument xmlDocument;
XmlReader xr;
XmlNode node;
SqlDataReader rdr = null;

try
{
    xmlDocument = new XmlDocument();
    conn.ConnectionString = "Data Source=test;Initial Catalog=teste;Integrated Security=SSPI;";
    cmd = new SqlCommand();
    cmd.Connection = conn;
    cmd.CommandType = CommandType.StoredProcedure;
    cmd.CommandText = "[dbo].[spSearchKeywords]";

    cmd.Parameters.Add(new SqlParameter("@VALUE", "XPT"));

    conn.Open();

    xr = cmd.ExecuteXmlReader();

    conn.Close();
    node = xmlDocument.ReadNode(xr);
}

它连接并执行命令，但是它什么也不返回 有数据要返回且参数正确（当我在sql中调用具有相同参数的过程时，它会返回一个结果）

这里是过程：

ALTER PROCEDURE [dbo].[spSearchKeywords]
(
    @VALUE                 NVARCHAR(50)  = NULL,
    @ACCOUNTGROUPID         NVARCHAR(50)  = NULL,
    @ShortCodeId         NVARCHAR(50)  = NULL,
    @VALUETYPE             NVARCHAR(50)  = NULL,
    @ASSEMBLY             NVARCHAR(100) = NULL,
    @ASSEMBLYCONTAINSURI NCHAR   (10)  = NULL,
    @ASSEMBLYTYPE         NVARCHAR(50)  = NULL
)
AS
BEGIN

    SET NOCOUNT ON;

    SELECT [Value]
          ,[AccountGroupId]
          ,[ShortCodeId]
          ,[ValueType]
          ,[assembly]
          ,[assemblyContainsUri]
          ,[assemblyType]
      FROM [teste].[dbo].[keywords]
     WHERE [Value]                 = ISNULL(@VALUE,                [Value])
       AND [AccountGroupId]         = ISNULL(@ACCOUNTGROUPID,        [AccountGroupId])
       AND [ShortCodeId]         = ISNULL(@SHORTCODEID,            [ShortCodeId])
       AND [ValueType]             = ISNULL(@VALUETYPE,            [ValueType])
       AND [assembly]             = ISNULL(@ASSEMBLY,            [assembly])
       AND [assemblyContainsUri] = ISNULL(@ASSEMBLYCONTAINSURI, [assemblyContainsUri])
       AND [assemblyType]         = ISNULL(@ASSEMBLYTYPE,        [assemblyType])
     FOR XML AUTO
END

Answer 1

在实际使用 XmlReader 之前，您不能关闭连接。尝试将conn.Close() 放在node = xmlDocument.ReadNode(xr); 下方。并考虑您的一次性数据库对象的 using 语句。