Generic QueryMultiple with Dapper

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花落未央
花落未央 2020-12-22 07:48

I have a base repository with a Generic Get method to return Data using Dapper like

  public T Get(Func query)
    {
                


        
1条回答
  •  北荒
    北荒 (楼主)
    2020-12-22 08:23

    You could do something like this which will return a tuple containing IEnumerables of each type you are after.

    In Base Repository

    (It's basically a bunch of overloads...you can add more overloads if you have more types).

    public Tuple, IEnumerable> GetMultiple(string sql, object parameters,
                                            Func> func1,
                                            Func> func2)
            {
                var objs = getMultiple(sql, parameters, func1, func2);
                return Tuple.Create(objs[0] as IEnumerable, objs[1] as IEnumerable);
            }
    
            public Tuple, IEnumerable, IEnumerable> GetMultiple(string sql, object parameters,
                                            Func> func1,
                                            Func> func2,
                                            Func> func3)
            {
                var objs = getMultiple(sql, parameters, func1, func2, func3);
                return Tuple.Create(objs[0] as IEnumerable, objs[1] as IEnumerable, objs[2] as IEnumerable);
            }
    
            private List getMultiple(string sql, object parameters,params Func[] readerFuncs )
            {
                var returnResults = new List();
                using (IDbConnection db = new SqlConnection(ConfigurationManager.ConnectionStrings["myDB"].ConnectionString))
                {
                    var gridReader = db.QueryMultiple(sql, parameters);
    
                    foreach(var readerFunc in readerFuncs)
                    {
                        var obj = readerFunc(gridReader);
                        returnResults.Add(obj);
                    }
                }
    
                return returnResults;
            }
    
    
    

    In Derived Repository

    (pretty clean and more importantly, typed!)

    public class Foo { }
    
            public class Bar { }
    
            public void sample()
            {
                var sql = "select * from Foo; select * from Bar";
                var foosAndBars = this.GetMultiple(sql, new { param = "baz" }, gr => gr.Read(), gr => gr.Read());
                var foos = foosAndBars.Item1;
                var bars = foosAndBars.Item2;
            }
    

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