插入帶有where子句的語句c＃

Question

我試圖根據cookie中的值將詳細信息插入表中。這裏是代碼

SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["RegistrationConnectionString"].ConnectionString); 
     conn.Open(); 
     string insertQuery = "insert into Details (Employees, Performance, TotalPerformance, Attitude, TotalAttitude) values(@employees, @performance ,@totalPerformance, attitude, totalAttitude)"; 
     SqlCommand com = new SqlCommand(insertQuery, conn); 
     com.Parameters.AddWithValue("@employees", Request.QueryString["employees"]); 
     com.Parameters.AddWithValue("@performance", totalPer.ToString()); 
     com.Parameters.AddWithValue("@totalPerformance", totalPercent.ToString()); 
     com.Parameters.AddWithValue("@attitude", totalAtt.ToString()); 
     com.Parameters.AddWithValue("@totalattitude", totalPercent.ToString()); 



     com.ExecuteNonQuery(); 

這工作正常，但在管柱嵌查詢行我想，如果說對列「名稱」中的值where子句，在那裏將值插入到某個行中添加行匹配一個cookie。我不知道正確的語法 感謝您的幫助

Answer 1

您需要一個UPDATE語句，而不是INSERT語句，因爲您要修改現有記錄。

using (
    SqlConnection conn = 
     new SqlConnection(
      ConfigurationManager.ConnectionStrings["RegistrationConnectionString"].ConnectionString)) 
{ 
    conn.Open(); 
    string updateQuery = 
     @"UPDATE Details 
     SET Employees = @employeee, 
     Performance = @performance , 
     TotalPerformance = @totalPerformance, 
     Attitude = @attitude, 
     TotalAttitude = @totalattitude 
     WHERE yourField = @yourConditionValue"; 

    using (SqlCommand com = new SqlCommand(updateQuery, conn)) 
    { 
     com.Parameters.AddWithValue("@employees", Request.QueryString["employees"]); 
     com.Parameters.AddWithValue("@performance", totalPer.ToString()); 
     com.Parameters.AddWithValue("@totalPerformance", totalPercent.ToString()); 
     com.Parameters.AddWithValue("@attitude", totalAtt.ToString()); 
     com.Parameters.AddWithValue("@totalattitude", totalPercent.ToString()); 
     com.Parameters.AddWithValue("@yourConditionValue", yourValue); 
     com.ExecuteNonQuery(); 
    } 
} 

+1，對於你的問題，另一件事情，enclose your Command and Connection object inusing語句中使用的參數。

Answer 2

你在找什麼有時被稱爲UPSERT。如果它已經存在，它將會記錄UPDATE;如果它不存在，則會記錄INSERT。

對於此功能，SQL Server 2008和更高版本具有MERGE關鍵字。否則，我會用正確的邏輯寫一個IF語句的存儲過程。