Sql简单封装

 public class SqlHelper
     {
         public static string SqlConnectionStr = ConfigurationManager.ConnectionStrings["SqlCon"].ConnectionString;

         public static DataTable Query(string sql)
         {
             using (SqlConnection con = new SqlConnection(SqlConnectionStr))
             {
                 using (SqlDataAdapter da = new SqlDataAdapter(sql, con))
                 {
                     DataTable dt = new DataTable();
                     try
                     {
                         con.Open();
                         da.Fill(dt);
                         return dt;
                     }
                     catch (Exception ex)
                     {
                         throw ex;
                     }
                     finally
                     {
                         if (con.State == ConnectionState.Open)
                             con.Close();
                     }
                 }
             }
         }

         public static void Excute(string sql)
         {
             using (SqlConnection con = new SqlConnection(SqlConnectionStr))
             {
                 using (SqlCommand cmd = new SqlCommand(sql, con))
                 {
                     try
                     {
                         con.Open();
                         cmd.ExecuteNonQuery();
                     }
                     catch (Exception ex)
                     {
                         throw ex;
                     }
                     finally
                     {
                         if (con.State == ConnectionState.Open)
                             con.Close();
                     }
                 }
             }
         }

         public static void Excute(string sql, CommandType cmdType, SqlParameter[] spArr)
         {
             using (SqlConnection con = new SqlConnection(SqlConnectionStr))
             {
                 using (SqlCommand cmd = new SqlCommand(sql, con))
                 {
                     foreach (SqlParameter sp in spArr)
                     {
                         cmd.Parameters.Add(sp);
                     }
                     try
                     {
                         cmd.CommandType = cmdType;
                         con.Open();
                         cmd.ExecuteNonQuery();
                     }
                     catch (Exception ex)
                     {
                         throw ex;
                     }
                     finally
                     {
                         if (con.State == ConnectionState.Open)
                             con.Close();
                     }
                 }
             }
         }
     }