macro_rules! sql {
($sql_type:ty, $text:expr $(, $arg:expr)* $(,)?) => { ... };
}Expand description
sql!(Bool, "lower(?) = ?", users::email, "dan") -> a Declared
expression over whatever tables its slots name — keyed as row::Anon,
so it is selectable but not readable by name until .label(..). Slots are filled positionally, left to
right.
Every ? in the text is a slot: there is no escape for a literal one,
because two of the three dialects write their own bind parameters as ?
and a ? left in the text would be read as one. A string containing a
? goes in a slot, where it binds as a value; Postgres’s jsonb
operators are reached through their function spellings
(jsonb_exists(?, 'key')).