winfrom增加private void button1_Click(object sender, EventArgs e)
{SqlConnection conn = new   SqlConnection("server=.;database=mydb;user=sa;pwd=123");SqlCommand cmd = conn.CreateCommand();cmd.CommandText = "insert into fruit     values(@ids,@name,@price,@source,@stack,@numbers,@image)";cmd.Parameters.Add("@ids",txtids.Text);cmd.Parameters.Add("@name", txtname.Text);cmd.Parameters.Add("@price", txtprice.Text);cmd.Parameters.Add("@source", txtsource.Text);cmd.Parameters.Add("@stack", txtstack.Text);cmd.Parameters.Add("@numbers", txtnumbers.Text);cmd.Parameters.Add("@image", txtimage.Text);conn.Open();cmd.ExecuteNonQuery();conn.Close();
}winfrom 查询private void button1_Click(object sender, EventArgs e)
{SqlConnection conn = new     SqlConnection("server=.;database=mydb;user=sa;pwd=123");SqlCommand cmd = conn.CreateCommand();cmd.CommandText = "select *from fruit where name like     '%"+textBox1.Text.Trim()+"%' or ids like '%"+textBox1.Text.Trim()+"%'";conn.Open();SqlDataReader dr = cmd.ExecuteReader();listView1.Items.Clear();while (dr.Read())
{ListViewItem lvt = new ListViewItem();lvt.Text = dr["ids"].ToString();//第一列lvt.SubItems.Add(dr["name"].ToString());lvt.SubItems.Add(dr["price"].ToString());lvt.SubItems.Add(dr["source"].ToString());lvt.SubItems.Add(dr["stack"].ToString());lvt.SubItems.Add(dr["numbers"].ToString());lvt.SubItems.Add(dr["image"].ToString());listView1.Items.Add(lvt);
}conn.Close();
}winfrom 删除：private void button2_Click(object sender, EventArgs e)
{
//selecteditems存着选中项的集合
if (listView1.SelectedItems.Count > 0)
{foreach (ListViewItem lvt in listView1.SelectedItems)
{
//连接数据库，根据编号删除数据SqlConnection conn = new SqlConnection("server=.;database=mydb;user=sa;pwd=123");SqlCommand cmd = conn.CreateCommand();cmd.CommandText = "delete from fruit where ids=@ids";cmd.Parameters.Clear();cmd.Parameters.Add("@ids",lvt.Text);conn.Open();cmd.ExecuteNonQuery();conn.Close();}
}
}winfrom 修改private void button1_Click(object sender, EventArgs e)
{FruitData data = new FruitData();data.Ids = txtids.Text;data.Name = txtname.Text;data.Price = decimal.Parse(txtprice.Text);data.Source = txtsource.Text;data.Stack = txtstack.Text;data.Image = txtimage.Text;data.Numbers = int.Parse(txtnumbers.Text);new FruitDA().Update(data);
}