public void Test_55()
{
//结果
var result = new String();
result.AppendLine("Select * ");
result.Append("From ");
result.AppendLine("(Select Count(*) ");
result.AppendLine("From [Test2] ");
result.AppendLine("Where [Name]=@_p_0) As [test] ");
result.Append("Where [Age]=@_p_1");
//执行
var builder2 = _builder.New().Count().From("Test2").Where("Name", "a");
_builder.AppendFrom(builder2, "test").Where("Age", 1);
_output.WriteLine(_builder.ToSql());
//验证
Assert.Equal(result.ToString(), _builder.ToSql());
Assert.Equal(2, _builder.GetParams().Count);
Assert.Equal("a", _builder.GetParams()["@_p_0"]);
Assert.Equal(1, _builder.GetParams()["@_p_1"]);
}