要插入到SQL Server CE數據庫的Datagridview值

Question

我有一個問題，即要將datagridview中的所有值插入到SQL Server CE數據庫中。

這裏是我寫的代碼：

private void btn_savedp_Click(object sender, EventArgs e) 
{ 
     // Retrieve the connection string from the settings file. 
     string conString = Properties.Settings.Default.EchonologiaConnectionString; 

     string sqlQuery = "INSERT INTO tb_DataPoint (PierID, InspectDate, DPName, ZoneColumn, ZoneRow, Result, Longitude, Latitude)"; 
     sqlQuery += "VALUES (@PierID, @InspectDate, @DPName, @ZoneColumn, @ZoneRow, @Result, @Longitude, @Latitude)"; 

     // Open the connection using the connection string. 
     using (SqlCeConnection con = new SqlCeConnection(conString)) 
     { 
      // Insert into the SqlCe table. ExecuteNonQuery is best for inserts. 
      using (SqlCeCommand com = new SqlCeCommand(sqlQuery, con)) 
      { 
       con.Open(); 

       for (int i = 0; i < dgDataPoint.Rows.Count; i++) 
       { 
        com.Parameters.AddWithValue("DPName", dgDataPoint.Rows[i].Cells["DataPointName"].Value); 
        com.Parameters.AddWithValue("ZoneColumn", dgDataPoint.Rows[i].Cells["ZoneColumn"].Value); 
        com.Parameters.AddWithValue("ZoneRow", dgDataPoint.Rows[i].Cells["ZoneRow"].Value); 
        com.Parameters.AddWithValue("Result", dgDataPoint.Rows[i].Cells["Result"].Value); 
        com.Parameters.AddWithValue("Longitude", dgDataPoint.Rows[i].Cells["Longitude"].Value); 
        com.Parameters.AddWithValue("Latitude", dgDataPoint.Rows[i].Cells["Latitude"].Value); 
        com.Parameters.AddWithValue("PierID", cbPier.Text); 
        com.Parameters.AddWithValue("InspectDate", dtInspect.Text); 
       } 

       com.ExecuteNonQuery(); 
       com.Parameters.Clear();    
       con.Close();      
      } 
     } 

有錯誤我得到的是：

具有該名稱的SqlCeParameter已經被這個SqlCeParameterCollection遏制。

有人可以告訴我如何糾正這個問題嗎？

謝謝

Answer 1

您可以在循環中的每次迭代中添加參數。您可以在循環外部和循環中移動參數的添加，只需設置值即可。像這樣：

//Before loop 
cms.Parameters.Add(<parameterNameHere>); 

// In the loop 
for (int i = 0; i < dgDataPoint.Rows.Count; i++) 
{ 
    com.Parameters["DPName"]= 
     dgDataPoint.Rows[i].Cells["DataPointName"].Value; 
    ... 
} 

Answer 2

您必須爲網格中的每一行構造一個新的命令。

修改後的代碼：

private void btn_savedp_Click(object sender, EventArgs e) 
    { 

     // Retrieve the connection string from the settings file. 
     string conString = Properties.Settings.Default.EchonologiaConnectionString; 

     string sqlQuery = "INSERT INTO tb_DataPoint (PierID, InspectDate, DPName, ZoneColumn, ZoneRow, Result, Longitude, Latitude)"; 
     sqlQuery += "VALUES (@PierID, @InspectDate, @DPName, @ZoneColumn, @ZoneRow, @Result, @Longitude, @Latitude)"; 


     // Open the connection using the connection string. 
     using (SqlCeConnection con = new SqlCeConnection(conString)) 
     { 
       con.Open(); 
      // Insert into the SqlCe table. ExecuteNonQuery is best for inserts. 
       for (int i = 0; i < dgDataPoint.Rows.Count; i++) 
       { 
        using (SqlCeCommand com = new SqlCeCommand(sqlQuery, con)) 
        { 

         com.Parameters.AddWithValue("DPName", dgDataPoint.Rows[i].Cells["DataPointName"].Value); 
         com.Parameters.AddWithValue("ZoneColumn", dgDataPoint.Rows[i].Cells["ZoneColumn"].Value); 
         com.Parameters.AddWithValue("ZoneRow", dgDataPoint.Rows[i].Cells["ZoneRow"].Value); 
         com.Parameters.AddWithValue("Result", dgDataPoint.Rows[i].Cells["Result"].Value); 
         com.Parameters.AddWithValue("Longitude", dgDataPoint.Rows[i].Cells["Longitude"].Value); 
         com.Parameters.AddWithValue("Latitude", dgDataPoint.Rows[i].Cells["Latitude"].Value); 
         com.Parameters.AddWithValue("PierID", cbPier.Text); 
         com.Parameters.AddWithValue("InspectDate", dtInspect.Text); 

         com.ExecuteNonQuery(); 

         com.Parameters.Clear();    
        } 

       } 

      con.Close(); 
     }