On Sunday, 3 January 2016 at 14:32:48 UTC, Jacob Carlborg wrote:
On 2016-01-02 21:48, Sebastiaan Koppe wrote:
I meant that you generate the struct from the DSL, and then
migration
code from that struct.
I don't think I understand, it seems complicated.
Suppose you have this:
mixin(db(`
Entity Person
Fields
name -> string
age -> integer
Query
byAge(a -> integer) -> age == a
`));
which generates something like this:
struct Person
{
string name;
int age
}
auto getPersonByAge(DB db, int a)
{
return db.prepare!Person("SELECT name,age FROM Person WHERE age
= ?").query(a);
}
and then later in time:
mixin(db(`
Entity Person
Fields
name -> string
age -> integer
phone -> string
Query
byAge(a -> integer) -> age == a
`));
Given that you have access to both version it is easy to generate
migration code for the phone field.
Maybe it is contrived, but I think it shows you can do more with
the DSL than just validating queries.
