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POcheck for duplicate records in a sql server table using c#
 

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  1. POcheck for duplicate records in a sql server table using c#
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    <p>I have a table in SQL server that contains string data on two columns. I also have a "add" method in c# , but I don't what to be able to add the same data on the two columns again.For example in the table I have data similar to this: </p> <pre class="lang-none prettyprint-override"><code>code first_name last_name 1 john smith 2 mike croft </code></pre> <p>I don't want to have the possibility to add john smith or mike croft again even if the code is different. I'm kind of new to c# so if someone could give me a simple answer in a code I would really appreciate it.</p> <p>P.S. The code is the primary key , and I have other columns as well. </p> <p>This is the code i have :</p> <pre><code> Form1 obj = (Form1)Application.OpenForms["Form1"]; private void button2_Click(object sender, EventArgs e) { SqlConnection cn = new SqlConnection(@" Data Source=HOME-D2CADC8D4F\SQL;Initial Catalog=motociclete;Integrated Security=True"); MemoryStream ms = new MemoryStream(); pictureBox1.Image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg); byte[] pic_arr = new byte[ms.Length]; ms.Position = 0; ms.Read(pic_arr, 0, pic_arr.Length); SqlCommand cmd = new SqlCommand("insert into motociclete(firma,model,poza,pret,anf,greutate,caprez,putere,garantie,stoc) values (@firma,@model,@poza,@pret,@anf,@greutate,@caprez,@putere,@garantie,@stoc)",cn); cmd.Parameters.AddWithValue("@firma", textBox3.Text); cmd.Parameters.AddWithValue("@model", textBox10.Text); cmd.Parameters.AddWithValue("@poza", pic_arr); cmd.Parameters.AddWithValue("@pret", textBox7.Text); cmd.Parameters.AddWithValue("@anf", textBox4.Text); cmd.Parameters.AddWithValue("@greutate", textBox9.Text); cmd.Parameters.AddWithValue("@caprez", textBox5.Text); cmd.Parameters.AddWithValue("@putere", textBox8.Text); cmd.Parameters.AddWithValue("@garantie", textBox6.Text); cmd.Parameters.AddWithValue("@stoc", textBox2.Text); cn.Open(); try { int rez = cmd.ExecuteNonQuery(); if (rez &gt; 0) { MessageBox.Show("Adaugare reusita "); } } catch (Exception ex) { MessageBox.Show(ex.Message); } finally { cn.Close(); obj.loaddata(); this.Close(); } } } </code></pre> <p>I don't want to be able to add two records with the same "firma" and "model".But it's ok if one of them repeats itself. I hope the code helps.</p>
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    1. USArtemix
    1. USstefan9976
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      1. POcheck for duplicate records in a sql server table using c#
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      1. VTDownMod
    2. VO
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      1. VTUpMod
    1. COCan you show us what code you have so far?
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      1. POcheck for duplicate records in a sql server table using c#
      1. USAmy
    2. COI'd probably start by putting a `UNIQUE INDEX` on `(first_name, last_name)`
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      1. POcheck for duplicate records in a sql server table using c#
      1. USMike Christensen
    3. COWhat data access technology will you be using? I think service stack's ormlite is easy to use and powerful.
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      1. POcheck for duplicate records in a sql server table using c#
      1. USJason
 

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