如何計算從c＃中的sql表的行數？

Question

如何統計c＃中sql表的行數？ 我需要從我的數據庫中提取一些數據...

Answer 1

你的意思是嗎？

SELECT COUNT(*) 
FROM yourTable 
WHERE .... 

Answer 2

你可以試試這樣：

select count(*) from tablename where columname = 'values' 

C＃代碼將是這樣的： -

public int A() 
{ 
    string stmt = "SELECT COUNT(*) FROM dbo.tablename"; 
    int count = 0; 

    using(SqlConnection thisConnection = new SqlConnection("Data Source=DATASOURCE")) 
    { 
     using(SqlCommand cmdCount = new SqlCommand(stmt, thisConnection)) 
     { 
      thisConnection.Open(); 
      count = (int)cmdCount.ExecuteScalar(); 
     } 
    } 
    return count; 
} 

Answer 3

你需要從C＃中的數據庫連接第一。然後，你需要傳遞下面的查詢作爲commandText。

Select count(*) from TableName

使用的ExecuteScalar /的ExecuteReader來獲取返回的計數。

Answer 4

可以使您可以使用所有的時間作爲

public static int GetTableCount(string tablename, string connStr = null) 
    { 
     string stmt = string.Format("SELECT COUNT(*) FROM {0}", tablename); 
     if (String.IsNullOrEmpty(connStr)) 
      connStr = ConnectionString; 
     int count = 0; 
     try 
     { 

      using (SqlConnection thisConnection = new SqlConnection(connStr)) 
      { 
       using (SqlCommand cmdCount = new SqlCommand(stmt, thisConnection)) 
       { 
        thisConnection.Open(); 
        count = (int)cmdCount.ExecuteScalar(); 
       } 
      } 
      return count; 
     } 
     catch (Exception ex) 
     { 
      VDBLogger.LogError(ex); 
      return 0; 
     } 
    } 

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