数据类型不匹配

Question

我在数据库表中的数据类型是短文本，我不知道为什么，我在command2.ExecuteNonQuery();

错误消息

An unhandled exception of type 'System.Data.OleDb.OleDbException' occurred in System.Data.dll收到此错误

Additional information: Data type mismatch in criteria expression.

我的代码

OleDbCommand cmd1 = new OleDbCommand(); 
cmd1.Connection = con; 
cmd1.CommandText = "SELECT * FROM Customers Where FirstName=@FirstName OR LastName=@FirstName OR NRIC=@FirstName"; 
cmd1.Parameters.AddWithValue("@FirstName", txtSearch.Text); 
OleDbDataReader read2 = cmd1.ExecuteReader(); 
string id = ""; 
while(read2.Read()) 
{ 
    id = read2["id"].ToString(); 
} 
OleDbCommand command2 = new OleDbCommand(); 
command2.CommandText = "UPDATE CheckIn_Details SET ModeOfCheckIn='True' WHERE ID='" + id + "'"; 
command2.Connection = con; 
command2.ExecuteNonQuery(); 

Answer 1

如果ID是自动编号，那么您不需要引号。试试这个：

command2.CommandText = "UPDATE CheckIn_Details SET ModeOfCheckIn='True' 
WHERE ID=" + id;