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();
                    }
                }
            }
        }
    }