c# - 执行以下 c# 代码时出错

Question

我曾尝试使用以下代码删除表中的一行，但出现错误。

{System.Data.OleDb.OleDbException: Missing ), ], or Item in query expression 
'[CompanyID] not in (Select [CompanyID] from EmployeeDetails 
where [CompanyID] = @cmpID'.

这是我的代码：

int companyID = _cmpDetailsList[i].CompanyID;        
OleDbCommand upcmd = new OleDbCommand(
    "delete * from CompanyDetails where [CompanyID] not in " + 
    "(Select [CompanyID] from EmployeeDetails where [CompanyID] = @cmpID", conn);
conn.Open(); 
upcmd.Parameters.AddWithValue("@cmpID", companyID);
upcmd.ExecuteNonQuery();
conn.Close();

我将命令修改为这种格式

OleDbCommand upcmd = new OleDbCommand("delete * from CompanyDetails where [CompanyID]= @cmpID and not in (Select [CompanyID] from EmployeeDetails where [CompanyID] = @cmpID)", conn);

我收到以下错误

System.Data.OleDb.OleDbException：查询表达式中的语法错误（缺少运算符）“[CompanyID] = @cmpID 而不是（从 EmployeeDetails 中选择 [CompanyID]，其中 [CompanyID] = @cmpID）”。

请解决

Answer 1

如果您阅读错误，它会告诉您问题：

OleDbCommand upcmd = new OleDbCommand(
"delete from CompanyDetails where [CompanyID] not in " + 
"(Select [CompanyID] from EmployeeDetails where [CompanyID] = @cmpID)", conn);

你最后有一个(但没有匹配)。