SQL 查询在 C# 中执行，但没有 return 任何结果

Question

我需要用我的 C# 执行我的 SQL 服务器 xevent 创建并启动它，然后从文件中读取它的内容。查询执行正常，未显示任何错误，但未在 SQL 服务器中添加会话，因此未返回任何结果。我在 SSMS 上执行了查询，它使用 N' 将变量连接到查询，但是当我将相同的变量复制到 C# 时，它显示了不正确的语法。有帮助吗？

My C#:
        
public ActionResult CreateSession(string id)
{
    System.Data.SqlClient.SqlConnection con = new System.Data.SqlClient.SqlConnection(connectionString);
    string dbName = id;
    string path = @".\wwwroot\ExecutedQueries\"+dbName;
    System.IO.Directory.CreateDirectory(path);
    string fileName = dbName +DateTime.Now.ToString("dd_MM_yyyy_hh_mm_ss") +".xel";
    string pathString = System.IO.Path.Combine(path, fileName);
    if (!System.IO.File.Exists(pathString))
    {
        System.IO.FileStream fs = System.IO.File.Create(pathString);                   
    }
    string sql="DECLARE @sql nvarchar(max) = N'CREATE EVENT SESSION " + dbName + "_Session1"
    + " ON SERVER" + "ADD EVENT sqlserver.sql_statement_completed"
    + "(ACTION(sqlserver.sql_text, sqlserver.tsql_stack, sqlserver.client_app_name," +
   " sqlserver.client_hostname, sqlserver.username) WHERE(sqlserver.database_name =''"  + dbName + "'')),"
    + "ADD EVENT sqlserver.sql_statement_starting(ACTION(sqlserver.sql_text, sqlserver.tsql_stack, sqlserver.client_app_name, sqlserver.client_hostname, sqlserver.username) WHERE(sqlserver.database_name =''" + dbName + "''))"
    + "ADD target package0.event_file( SET filename =''" + pathString + "'')"
    + "WITH(MAX_MEMORY = 4096 KB, EVENT_RETENTION_MODE = ALLOW_SINGLE_EVENT_LOSS,"
    + "MAX_DISPATCH_LATENCY = 30 SECONDS, MAX_EVENT_SIZE = 0 KB,"
    + " MEMORY_PARTITION_MODE = NONE, TRACK_CAUSALITY = OFF, STARTUP_STATE = OFF);";

    using (System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand(sql, con))
    {
        con.Open();
        cmd.ExecuteNonQuery();
        con.Close();
    }

    return RedirectToAction("BeginSession", new { database = dbName });
}

public ActionResult BeginSession(string database)
{
    System.Data.SqlClient.SqlConnection con = new System.Data.SqlClient.SqlConnection(connectionString);

    string sql = "DECLARE @sql nvarchar(max) = N'ALTER EVENT SESSION "+@database+"_Session1 ON SERVER STATE = START  '";

    using (System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand(sql, con))
    {
        con.Open();
        cmd.ExecuteNonQuery();
        con.Close();
    }
    return RedirectToAction("ExecutedQueries", new { dataBase = database });
}

public ActionResult ExecutedQueries(string dataBase)
{    
    System.Data.SqlClient.SqlConnection con = new System.Data.SqlClient.SqlConnection(connectionString);
   
    string path = @"./wwwroot/ExecutedQueries/" + dataBase
    string fileName = dataBase + "*.xel";
    string pathString = System.IO.Path.Combine(path, fileName);
    try
    {
        byte[] readBuffer = System.IO.File.ReadAllBytes(pathString);
        foreach (byte b in readBuffer)
        {
            Console.Write(b + " ");
        }
        Console.WriteLine();
    }
    catch (System.IO.IOException e)
    {
        Console.WriteLine(e.Message);
    }       

    return View();
}

Answer 1

这生成了可以执行的SQL：

string sql = "CREATE EVENT SESSION " + dbName + "_Session1" +
 " ON SERVER" +
  " ADD EVENT sqlserver.sql_statement_completed" +
  "( ACTION(sqlserver.sql_text, sqlserver.tsql_stack, sqlserver.client_app_name," +
           " sqlserver.client_hostname, sqlserver.username) WHERE(sqlserver.database_name ='" + dbName + "'))," +
  "ADD EVENT sqlserver.sql_statement_starting( ACTION(sqlserver.sql_text, sqlserver.tsql_stack, sqlserver.client_app_name,sqlserver.client_hostname, sqlserver.username) WHERE(sqlserver.database_name ='" + dbName + "'))" +
"ADD target package0.event_file( SET filename ='" + pathString + "')" +
"WITH(MAX_MEMORY = 4096 KB, EVENT_RETENTION_MODE = ALLOW_SINGLE_EVENT_LOSS," +
      "MAX_DISPATCH_LATENCY = 30 SECONDS, MAX_EVENT_SIZE = 0 KB," +
     " MEMORY_PARTITION_MODE = NONE, TRACK_CAUSALITY = OFF, STARTUP_STATE = OFF);";

我更改了它，使其直接创建事件（而不是创建一个未执行的@sql 变量），并且在 ADD EVENT 之前缺少一个 space，它正在生成 SERVERADD 而不是 SERVER ADD。

SQL 查询在 C# 中执行，但没有 return 任何结果

SQL query executes in C# but it does not return any result

c#

sql-server

extended-events