条件表达式Oledb Access数据库中的数据类型不匹配

时间:2016-01-16 14:20:35

标签: c# oledb

我收到错误:

  

标准表达式中的数据类型不匹配

使用此代码时。并使用Access数据库。

OleDbConnection bab = new OleDbConnection();

bab.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\sdega\OneDrive\school\Werknemersdata.accdb;Persist Security Info=False;";

bab.Open();
try
{                  
    OleDbCommand kaas = new OleDbCommand();

    kaas.Connection = bab;
    kaas.CommandText = "insert into Werknemersdata (Naam, Adres, Postcode, Woonplaats, Salaris) values ('" + txtNaam.Text + "', '" + txtAdress.Text + "', '" + txtpostcode1.Text + " " +txtpostcode2.Text + "', '" + txtwoonplaats.Text + "', '" + txtsalaris.Text + "')  ";
    kaas.ExecuteNonQuery(); // this is where it goes wrong

    txtStatus.BackColor = Color.Green;

    MessageBox.Show("data saved");

    bab.Close();

}
catch (Exception ghakbal)
{
    MessageBox.Show("Error" + ghakbal);
}

1 个答案:

答案 0 :(得分:2)

您在name之后错过了一个',在'" + txtpostcode1.Text + "之前错过了一个" +txtpostcode2.Text + "',在它们之间错过了一个,。它应该是这样的:

'" + txtpostcode1.Text + "' , '" +txtpostcode2.Text + "',

另外,我强烈建议您始终使用parameterized queries来避免SQL Injection。像这样:

kaas.CommandText = "insert into Werknemersdata (Naam, Adres, Postcode, Woonplaats, Salaris) values (?, ? ,.....");
kaas.Parameters.AddWithValue("Naam", txtNaam.Text);
kaas.Parameters.AddWithValue("Adres", txtAdress.Text);
//And other parameters...

最好直接指定类型并使用Value属性。阅读更多here