数据库中已经有一个对象异常

Question

我的代码出了什么问题...我尝试了几件事，但一次又一次地遇到同样的错误。

有什么帮助吗？？ 代码是：

SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings[SubDomainName].ToString());
conn.Open();
string temptable = "CREATE TABLE [dbo].[Tmptablenew]([TicketID] [int] NULL,[TicketDescription][varchar](max) NULL,[TicketAssignedTo] [varchar](100) NULL,[TicketCreatedDate] [datetime] NULL,[TicketStatus][varchar](50),CRMConnectionID [int] NULL,[TicketUpdatedDate] [Datetime] NULL,img [varchar](500) NULL)";
SqlCommand cmd = new SqlCommand(temptable, conn);
cmd.ExecuteNonQuery();
SqlCommand cmmd = new SqlCommand("select * from Tickets", conn);
SqlDataAdapter adapter = new SqlDataAdapter(cmmd);
DataTable dt1 = new DataTable("dt1");
adapter.Fill(dt1);
cmmd.ExecuteNonQuery();

//BulkCopy the data in the DataTable to the temp table
using (SqlBulkCopy bulk = new SqlBulkCopy(conn))
{
    bulk.DestinationTableName = "Tmptablenew";
    bulk.WriteToServer(result);
    conn.Close();
}
conn.Open();
string mergeSql = "merge into Tickets as Target " +
                     "using Tmptablenew as Source " +
                     "on " +
                     "Target.TicketID= Source.TicketID " +
                     "and Target.CRMConnectionID = Source.CRMConnectionID " +
                     "when not matched then " +
                     "insert (TicketID,TicketDescription,TicketAssignedTo,TicketCreatedDate,TicketStatus,CRMConnectionID,TicketUpdatedDate,img) values (Source.TicketID,Source.TicketDescription,Source.TicketAssignedTo,Source.TicketCreatedDate,Source.TicketStatus,Source.CRMConnectionID,Source.TicketUpdatedDate,Source.img);";

string mergesql1 = "Update Tickets SET TicketDescription=S.TicketDescription, TicketAssignedTo = S.TicketAssignedTo, TicketStatus = S.TicketStatus,TicketUpdatedDate = S.TicketUpdatedDate,img = S.img FROM Tickets t JOIN Tmptablenew AS S ON t.TicketID = S.TicketID and T.CRMConnectionID = S.CRMConnectionID";
cmd.CommandText = mergeSql;
cmd.ExecuteNonQuery();
cmmd.CommandText = mergesql1;
cmmd.ExecuteNonQuery();
cmd.CommandText = "drop table Tmptablenew";
cmd.ExecuteNonQuery();
//Clean up the temp table
conn.Close();

Answer 1

您正在创建表Tmptablenew，看起来该表已经存在于数据库中。

我认为，您正在尝试创建一个临时表，在这种情况下，将其创建为 MySQL 的 CREATE TEMPORARY TABLE 或使用表名 #Tmptablenew 的 MS SQL。同样在这种情况下，它会在会话关闭时自动删除。

编辑

因此，如果您使用的是 MySQL（根据您问题的标签），则必须更改 string temptable = "CREATE TEMPORARY TABLE [dbo].[Tmptablenew]([TicketID]... 等等。或者如果它是 MS SQL（我怀疑），那么 string temptable = "CREATE TABLE [dbo].[#Tmptablenew]([TicketID]... 等等（在这种情况下，您应该在代码中的任何位置将其命名为 #Tmptablenew）。