Question

我尝试使用更新SQL表时遇到问题我有datagridview，我需要更新SQL表并从值datagridview获取值。我的datagridview有超过10000行我花时间超过1:30非常慢

datagridview名称“dgv_balance”

以下是代码：

using (SqlConnection cn = new SqlConnection())
{
    cn.ConnectionString = "My Connection"
    cn.Open();
    using (SqlCommand cmd_select = new SqlCommand())
    {
        for (int i = 0; i < dgv_balance.RowCount; i++)
        {
            cmd_select.Connection = cn;
            cmd_select.CommandType = CommandType.StoredProcedure;
            cmd_select.CommandText = "clients_balances_select_glid_date";
            cmd_select.Parameters.AddWithValue("@glid", Convert.ToString(dgv_balance.Rows[i].Cells[0].Value));
            cmd_select.Parameters.AddWithValue("@date", Convert.ToDateTime(dgv_balance.Rows[i].Cells[2].Value));
            if (cmd_select.ExecuteScalar().ToString()=="")
            {
                using (SqlCommand cmd_insert = new SqlCommand())
                {
                    cmd_insert.Connection = cn;
                    cmd_insert.CommandType = CommandType.StoredProcedure;
                    cmd_insert.CommandText = "clients_balances_insert_data";
                    cmd_insert.Parameters.AddWithValue("@glid", Convert.ToString(dgv_balance.Rows[i].Cells[0].Value));
                    cmd_insert.Parameters.AddWithValue("@name", Convert.ToString(dgv_balance.Rows[i].Cells[1].Value));
                    cmd_insert.Parameters.AddWithValue("@date", Convert.ToString(dgv_balance.Rows[i].Cells[2].Value));
                    cmd_insert.Parameters.AddWithValue("@balance", Convert.ToString(dgv_balance.Rows[i].Cells[3].Value));
                    cmd_insert.ExecuteNonQuery();
                    cmd_insert.Parameters.Clear();
                }
            }
            else
            {
                using (SqlCommand cmd_update= new SqlCommand())
                {
                    cmd_update.Connection = cn;
                    cmd_update.CommandType = CommandType.StoredProcedure;
                    cmd_update.CommandText = "clients_balances_update_balance";
                    cmd_update.Parameters.AddWithValue("@glid", Convert.ToString(dgv_balance.Rows[i].Cells[0].Value));
                    cmd_update.Parameters.AddWithValue("@date", Convert.ToString(dgv_balance.Rows[i].Cells[2].Value));
                    cmd_update.Parameters.AddWithValue("@balance", Convert.ToString(dgv_balance.Rows[i].Cells[3].Value));
                    cmd_update.ExecuteNonQuery();
                    cmd_update.Parameters.Clear();
                }
            }
            cmd_select.Parameters.Clear();
        }
    }
}

Answer 1

在遍历datagridview行并缓存结果数据并在迭代datagridview时检查结果而不是在每行上调用结果数据之前，可能只需要调用SELECT命令一次。这样您就可以将命令减少10000。如果您能向我们展示您的程序查询，也会更好。或者，如果您的datagridview是数据的 ONLY 来源，那么您可以删除数据库中以前的所有数据，并为所有datagridview数据进行一次插入调用。

试试这个：

using (SqlConnection cn = new SqlConnection())
{
 cn.ConnectionString = "MyConnection" ;
 cn.Open();
 SqlDataAdapter da = new SqlDataAdapter(); 
 DataTable dt = new DataTable();
 using (SqlCommand cmd_select = new SqlCommand()) 
 {
   cmd_select.Connection = cn;      cmd_select.CommandType =   CommandType.StoredProcedure;    cmd_select.CommandText =   "clients_balances_select_glid_date";
  da.SelectCommand = cmd_select; 
  da.Fill(dt);
  for (int i = 0; i < dgv_balance.RowCount; i++) 
  { 
    if(/* check here if dt contains this    row*/)
    {
        // Insert
    }
    else 
    {
        // Update
     }
   }
 }
}

Answer 2

我认为您应该一次插入或更新所有数据。

为glId列创建索引。如果glId是主键，则将其编入索引。

假设List ClientBalance是您需要更新或插入的列表项。

public class ClientBalance
{
   GlId int {get;set;}
   ClientName string {get;set;}
   Balance decimal {get;set;}
   DateInput DateTime {get;set;}
}

您可以将列表项序列化为xml字符串并将其传递给存储过程

   public  string Serialize<T>(T value) where T : new()
    {
        var serializeXml = string.Empty;            
        if (value != null)
        {
            try
            {
                var xmlserializer = new XmlSerializer(typeof(T));
                var stringWriter = new StringWriter();
                var writer = XmlWriter.Create(stringWriter);
                xmlserializer.Serialize(writer, value);
                serializeXml = stringWriter.ToString();

                writer.Close();
            }
            catch (Exception ex)
            {                   
                return string.Empty;
            }
        }
        return serializeXml;
    }

为插入或更新项目创建一个新的存储过程：

    CREATE PROCEDURE [dbo].[clients_balances_insert_or_update]
     (
        @xmlObject nvarchar(max)
     )
     AS
     BEGIN
          -- TABLE INCLUDE DATE FROM XML
        DECLARE @tblBalances AS TABLE
        (
           GlId int,
           DateInput datetime,
           ClientName nvarchar(50),
           Balance decimal(18,2)
        )
        DECLARE @idoc int -- xml id

         -- PARSE XML TO OBJECT
        EXEC sp_xml_preparedocument @idoc OUTPUT, @xmlObject 
        INSERT INTO @tblBalances
                        (
                            GlId, DateInput, ClientName, Balance
                        )
                        SELECT s.GlId, s.DateInput, s.ClientName, s.Balance
                        FROM    OPENXML (@idoc, '/ArrayOfClientBalance/ClientBalance', 8) WITH (
                                    GlId            int 'GlId',                     
                                    DateInput   datetime 'DateInput',
                                    ClientName NVARCHAR(50) 'ClientName',
                                    Balance DECIMAL(18,2) 'Balance'
                                ) s
        EXEC sp_xml_removedocument @idoc

        -- USE MERGE FOR INSERT OR UPDATE DATE
        -- Use transaction 
        BEGIN TRAN InsertOrUpdate
        BEGIN TRY
            MERGE Target AS T
            USING @tblBalances AS S
            ON (T.GlId = S.GlId) 
            WHEN NOT MATCHED BY TARGET 
               THEN INSERT( GlId, DateInput, ClientName, Balance) VALUES( GlId, DateInput, ClientName, Balance)
            WHEN MATCHED 
               THEN UPDATE SET DateInput = S.DateInput, Balance = s.Balance

            COMMIT TRAN InsertOrUpdate;
        END TRY
        BEGIN CATCH
            ROLLBACK TRAN InsertOrUpdate;
            THROW;
        END CATCH
     END

希望这有用！

更新SQL表非常慢

2 个答案: