基于反射特性的简单数据库操作

首先上一个SqlHelper

public class SqlHelper
    {
        public static string GetSqlConnectionString()
        {
            return ConfigurationManager.ConnectionStrings["State"].ConnectionString;
        }
       
        public static int ExecuteNonQuery(string sql, params SqlParameter[] parameters)
        {
            using (SqlConnection conn = new SqlConnection(GetSqlConnectionString()))
            {
                using (SqlCommand comm = conn.CreateCommand())
                {
                    conn.Open();
                    comm.CommandText = sql;
                    comm.Parameters.AddRange(parameters);
                    return comm.ExecuteNonQuery();
                }
            }
        }
       
        public static object ExecuteScalar(string sql, params SqlParameter[] parameters)
        {
            using (SqlConnection conn = new SqlConnection(GetSqlConnectionString()))
            {
                using (SqlCommand comm = conn.CreateCommand())
                {
                    conn.Open();
                    comm.CommandText = sql;
                    comm.Parameters.AddRange(parameters);
                    return comm.ExecuteScalar();
                }
            }
        }
        
        public static DataTable ExecuteDataTable(string sql, params SqlParameter[] parameters)
        {
            using (SqlDataAdapter adapter = new SqlDataAdapter(sql, GetSqlConnectionString()))
            {
                DataTable dt = new DataTable();
                adapter.SelectCommand.Parameters.AddRange(parameters);
                adapter.Fill(dt);
                return dt;
            }
        }

        public static SqlDataReader ExecuteReader(string sqlText, params SqlParameter[] parameters)
        {
            //SqlDataReader要求，它读取数据的时候有，它独占它的SqlConnection对象，而且SqlConnection必须是Open状态
            SqlConnection conn = new SqlConnection(GetSqlConnectionString());//不要释放连接，因为后面还需要连接打开状态
            SqlCommand cmd = conn.CreateCommand();
            conn.Open();
            cmd.CommandText = sqlText;
            cmd.Parameters.AddRange(parameters);
            //CommandBehavior.CloseConnection当SqlDataReader释放的时候，顺便把SqlConnection对象也释放掉
            return cmd.ExecuteReader(CommandBehavior.CloseConnection);
        }
    }

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