Reading Data From Access Database in C#

Question

Hi want to read data from data base from the given ID (not Premanent). I am using the following code:

        OleDbConnection co = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\db1.mdb");
        co.Open();
        **OleDbCommand cmd = new OleDbCommand("SELECT * FROM Category1 Where ID = '"+textBox1.Text+"'", co);**
        OleDbDataReader reader = cmd.ExecuteReader();

        int i = 1;
        while (reader.Read())
        {
            ListViewItem li = new ListViewItem(i.ToString());
            li.SubItems.Add(reader.GetString(1));
            li.SubItems.Add(reader.GetString(2));
            li.SubItems.Add(reader.GetString(3));
            li.SubItems.Add(reader.GetString(4));
            listView1.Items.Add(li);
            i++;
        }

but it shows me an error message on the Bold line of code:

Data type mismatch in criteria expression.

Is ID an integer or a string in Access? Don't surround an integer with single quotes. — JeffO
– JeffO, Commented Jan 5, 2011 at 1:50

nycdan · Accepted Answer · 2011-01-04 20:57:09Z

2

Is the ID field numeric? You are comparing it to a string. That might be part of the problem.

answered Jan 4, 2011 at 20:57

nycdan

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1 Comment

Fionnuala Over a year ago

Data type mismatch very strongly suggests that it is not.

Steven K. · Accepted Answer · 2011-01-05 07:10:11Z

0

Like other people said: it sounds very much like ID isn't a string. However you should use parameters when adding user input or any variables to your SQL statement: http://weblogs.sqlteam.com/jeffs/archive/2006/07/21/10728.aspx

OleDbCommand cmd = new OleDbCommand("SELECT * FROM Category1 WHERE id = @id", co);
cmd.Parameters.AddWithValue("@id", textBox1.Text);

answered Jan 5, 2011 at 7:10

Steven K.

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Comments

Bojan B · Accepted Answer · 2016-09-16 12:03:53Z

0

Like other people said: it sounds very good working

string strDSN = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + Application.StartupPath + "\\Db1.accdb";
string strSQL = "SELECT * FROM Tbl1" ;
// create Objects of ADOConnection and ADOCommand
OleDbConnection myConn = new OleDbConnection(strDSN);
OleDbDataAdapter myCmd = new OleDbDataAdapter( strSQL, myConn ); 
myConn.Open();
DataSet dtSet = new DataSet();
myCmd.Fill( dtSet, "Tbl1" );
DataTable dTable = dtSet.Tables[0];
foreach( DataRow dtRow in dTable.Rows )
{
    listBox1.Items.Add( dtRow["id"].ToString());
    listBox2.Items.Add( dtRow["nm"].ToString());
    listBox3.Items.Add(dtRow["ag"].ToString());
}

edited Sep 16, 2016 at 12:03

Bojan B

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answered Sep 16, 2016 at 10:34

Bharat Chandra

1

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