ADO.NET 增删查改小总结

三套路-----增删改

Code

 1 using System.Data.SqlClient;
 2 
 3             SqlConnection conn = new SqlConnection("xxx");
 4 
 5 
 6             string sql = "xxx";
 7 
 8             SqlCommand comm = new SqlCommand(sql, conn);
 9 
10             conn.Open();
11 
12             comm.ExecuteNonQuery();
13 
14             conn.Close();

三套路-----查（绑定到DataGridView

Code

 1 using System.Data.SqlClient;
 2 
 3             SqlConnection conn = new SqlConnection("xxx");
 4 
 5             string sql = "xxx";
 6 
 7             SqlDataAdapter da = new SqlDataAdapter(sql, conn);
 8 
 9             DataSet ds = new DataSet();
10 
11             da.Fill(ds);
12 
13             dataGridView1.DataSource = ds.Tables[0];
14 
15   //要更新 查询语句要 查询主键列
16  
17             SqlCommandBuilder sd = new SqlCommandBuilder(da);
18 
19             da.Update(ds.Tables[0]);

三套路----查（绑定到ListView）

代码

using System.Data.SqlClient;

            SqlConnection conn = new SqlConnection("xxx");

string sql = "xx";

            SqlCommand comm = new SqlCommand(sql, conn);

            conn.Open();

            SqlDataReader read = comm.ExecuteReader();

while (read.Read())
            {
                ListViewItem lvi = new ListViewItem(read["xxx"].ToString());

                lvi.Tag = read["id"];

                listView1.Items.Add(lvi);

                lvi.SubItems.AddRange(new String[] { read["xxx"].ToString() });
            }

            read.Close();
            conn.Close();