三層架構:Helper層
阿新 • • 發佈:2020-07-14
三層架構:Helper層
public int count(string sql) { SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=DB_class;User ID=sa;Pwd=123;"); conn.Open(); SqlCommand cmd = new SqlCommand(sql, conn); int num = (int)cmd.ExecuteScalar(); conn.Close();return num; } public int count1(string sql) { SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=DB_class;User ID=sa;Pwd=123;"); conn.Open(); SqlCommand cmd = new SqlCommand(sql, conn); int i = cmd.ExecuteNonQuery(); conn.Close();return i; } public DataTable count2(string sql) { SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=DB_class;User ID=sa;Pwd=123;"); conn.Open(); SqlCommand cmd = new SqlCommand(sql, conn); SqlDataAdapter dr = newSqlDataAdapter(cmd); DataSet ds = new DataSet(); dr.Fill(ds, "shopping"); DataTable dt = ds.Tables["shopping"]; return dt; }