Reputation: 3
My sample code is as follows, I am getting following error;
Data Type Mismatch error in criteria expression.
Details => ScannerAlarmLimits is my table from .mdb database.
string jointS = dsetChamberS1.Tables[0].Rows[tot][0].ToString();
int select1S = Convert.ToInt32(jointS);
string sqlQuery1S = "SELECT TMin,TMax,HMin,HMax from ScannerAlarmLimits WHERE ScannerID='" +select1S+ "'";
OleDbCommand cmd1S = new OleDbCommand(sqlQuery1S, conn);
OleDbDataAdapter adapter1S = new OleDbDataAdapter(cmd1S);
adapter1S.Fill(dsetTempS, "ScannerAlarmLimits");
Upvotes: 0
Views: 1053
Reputation: 802
I just added single quote in the condition of where clause, now its working.
var query = "SELECT * from checkinout where read <> '1'";
Upvotes: 1
Reputation: 98868
If your ScannerID
column is integer, then you should not use single quotes with it. Single quotes are for characters. Like;
WHERE ScannerID = " + select1S;
But as a better way, you should always use parameterized queries. This kind of string concatenations are open for SQL Injection attacks. Aka bobby-tables.
And use using
statement to dispose your connections, commands and adapters.
string jointS = dsetChamberS1.Tables[0].Rows[tot][0].ToString();
int select1S = Convert.ToInt32(jointS);
using(var conn = new OleDbConnection(conString))
using(var cmd1S = conn.CreateCommand())
{
cmd1S.CommandText = "SELECT TMin,TMax,HMin,HMax from ScannerAlarmLimits WHERE ScannerID = @id";
cmd1S.Parameters.AddWithValue("@id", OleDbType.Integer).Value = select1S;
using(var adapter1S = new OleDbDataAdapter(cmd1S))
{
adapter1S.Fill(dsetTempS, "ScannerAlarmLimits");
}
}
Upvotes: 1