项目总结-SqlHelper

这里记录一个自己写的SqlHelper,没有技术含量。各位看官见谅！

public static class SqlHelper
    {
        private static readonly string conStr = ConfigurationManager.ConnectionStrings["sql"].ConnectionString;//这里需要使用到配置文件

        public static int ExecuteNonQuery(string sql, CommandType cmdType, params SqlParameter[] pms)
        {
            using (SqlConnection con = new SqlConnection(conStr))
            {
                using (SqlCommand cmd = new SqlCommand(sql, con))
                {
                    cmd.CommandType = cmdType;
                    if (pms != null)
                    {
                        cmd.Parameters.AddRange(pms);
                    }
                    con.Open();
                    return cmd.ExecuteNonQuery();
                }
            }
        }

        public static object ExecuteScalar(string sql, CommandType cmdType, params SqlParameter[] pms)
        {
            using (SqlConnection con = new SqlConnection(conStr))
            {
                using (SqlCommand cmd = new SqlCommand(sql, con))
                {
                    cmd.CommandType = cmdType;
                    if (pms != null)
                    {
                        cmd.Parameters.AddRange(pms);
                    }
                    con.Open();
                    return cmd.ExecuteScalar();
                }
            }
        }

        public static SqlDataReader ExecuteReader(string sql, CommandType cmdType, params SqlParameter[] pms)
        {
            SqlConnection con = new SqlConnection(conStr);//注意这一点，SqlDataReader 特征使然，没有使用using
            try
            {
                using (SqlCommand cmd = new SqlCommand(sql, con))
                {
                    cmd.CommandType = cmdType;
                    if (pms != null)
                    {
                        cmd.Parameters.AddRange(pms);
                    }
                    con.Open();
                    SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                    return reader;
                }
            }
            catch
            {
                con.Dispose();
                throw;
            }
        }

        public static DataTable ExecuteDataTable(string sql, CommandType cmdType, params SqlParameter[] pms)
        {
            using (SqlDataAdapter sda = new SqlDataAdapter(sql, conStr))
            {
                DataTable dt = new DataTable();

                sda.SelectCommand.CommandType = cmdType;
                if (pms != null)
                {
                    sda.SelectCommand.Parameters.AddRange(pms);
                }
                sda.Fill(dt);
                return dt;
            }
        }