Is it possible to do this build this query with Dapper?

问题

Is it possible do do the following? I tried, but when it got to the Query, it just said there was a null reference.

   var builder = new StringBuilder("select * from my table1 where 1 = 1");

if(x==1)
    builder.Append(" and x = @x");

if(y==2)
    builder.Append(" and y = @y");

// when it gets here, it just says null reference

 db.Query<table1>(builder.ToString(), new {x,y});

I got SqlBuilder to run in .net 3.5, but when I do this:

var builder = new SqlBuilder();

var sql = builder.AddTemplate("select * from table /**where**/ /**orderby**/");

 builder.Where("a = @a", new { a = 1 })
        .OrWhere("b = @b", new { b = 2 });

I expected select * from table WHERE a = @a OR ( b = @b )

but I got:

I expected select * from table WHERE a = @a AND ( b = @b )

回答1:

Presumably this was due to this bug. The attempted fix was made on Jul 31 2016 however there are still issues with this approach. The plan is that this would be fixed in the next major release.

来源：https://stackoverflow.com/questions/29156948/is-it-possible-to-do-this-build-this-query-with-dapper