| Copyright | (c) Eitan Chatav 2019 |
|---|---|
| Maintainer | eitan@morphism.tech |
| Stability | experimental |
| Safe Haskell | None |
| Language | Haskell2010 |
Squeal.PostgreSQL.Query.Values
Contents
Description
values statements
Synopsis
- values :: SListI cols => NP (Aliased (Expression 'Ungrouped lat with db params '[])) cols -> [NP (Aliased (Expression 'Ungrouped lat with db params '[])) cols] -> Query lat with db params cols
- values_ :: SListI cols => NP (Aliased (Expression 'Ungrouped lat with db params '[])) cols -> Query lat with db params cols
Values
Arguments
| :: SListI cols | |
| => NP (Aliased (Expression 'Ungrouped lat with db params '[])) cols | |
| -> [NP (Aliased (Expression 'Ungrouped lat with db params '[])) cols] | When more than one row is specified, all the rows must must have the same number of elements |
| -> Query lat with db params cols |
values computes a row value or set of row values
specified by value expressions. It is most commonly used
to generate a “constant table” within a larger command,
but it can be used on its own.
>>>type Row = '["a" ::: 'NotNull 'PGint4, "b" ::: 'NotNull 'PGtext]>>>let query = values (1 `as` #a :* "one" `as` #b) [] :: Query lat with db '[] Row>>>printSQL querySELECT * FROM (VALUES ((1 :: int4), (E'one' :: text))) AS t ("a", "b")