asp.net--ado.net5大对象代码示例

1. 连接数据库

string conn_string ="Data Source=localhost;Initial Catalog=SQLtest;Integrated Security=True";
SqlConnection connection =newSqlConnection(conn_string);

1. 执行查询

SqlCommand sqcommand =newSqlCommand("SelectAll",connection);
sqcommand.CommandType=CommandType.StoredProcedure;// 将命令变为存储过程的方式
SqlDataAdapter adapter =newSqlDataAdapter(sqcommand);
DataTable ds =newDataTable();
adapter.Fill(ds);
dataGridView1.DataSource= ds;
connection.Close();

1. 修改

string id = txt_id.Text.Trim();
string username = txt_username.Text.Trim();
string ps = txt_ps.Text.Trim();
string date = txt_date.Text.Trim();
string conn_string ="Data Source=localhost;Initial Catalog=SQLtest;Integrated Security=True";
SqlConnection connection =newSqlConnection(conn_string);
SqlCommand sqcommand =newSqlCommand("UpdateInfo", connection);
sqcommand.CommandType=CommandType.StoredProcedure;// 将命令变为存储过程的方式
SqlParameter sp_id =newSqlParameter("ID", id);
sqcommand.Parameters.Add(sp_id);
SqlParameter sp_username =newSqlParameter("Username", username);
sqcommand.Parameters.Add(sp_username);
SqlParameter sp_password =newSqlParameter("Password", ps);
sqcommand.Parameters.Add(sp_password);
SqlParameter sp_date =newSqlParameter("Date", date);
sqcommand.Parameters.Add(sp_date);
connection.Open();
int cc = sqcommand.ExecuteNonQuery();

1. 删除

string id = txt_id.Text.Trim();
string conn_string ="Data Source=localhost;Initial Catalog=SQLtest;Integrated Security=True";
SqlConnection connection =newSqlConnection(conn_string);
SqlCommand sqcommand =newSqlCommand("DeleteInfo", connection);
sqcommand.CommandType=CommandType.StoredProcedure;// 将命令变为存储过程的方式
SqlParameter sp =newSqlParameter("ID", id);
sqcommand.Parameters.Add(sp);
connection.Open();
sqcommand.ExecuteNonQuery();

1. 添加

string id = txt_id.Text.Trim();
string username = txt_username.Text.Trim();
string ps = txt_ps.Text.Trim();
string date = txt_date.Text.Trim();
string conn_string ="Data Source=localhost;Initial Catalog=SQLtest;Integrated Security=True";
SqlConnection connection =newSqlConnection(conn_string);
SqlCommand sqcommand =newSqlCommand("InsertInto", connection);
sqcommand.CommandType=CommandType.StoredProcedure;// 将命令变为存储过程的方式
SqlParameter sp_id =newSqlParameter("ID", id);
sqcommand.Parameters.Add(sp_id);
SqlParameter sp_username =newSqlParameter("Username", username);
sqcommand.Parameters.Add(sp_username);
SqlParameter sp_password =newSqlParameter("Password", ps);
sqcommand.Parameters.Add(sp_password);
SqlParameter sp_date =newSqlParameter("Date", date);
sqcommand.Parameters.Add(sp_date);
connection.Open();
int cc = sqcommand.ExecuteNonQuery();