Squeal.PostgreSQL.Manipulation.Delete

delete statements

Delete

deleteFrom

Arguments

:: (SListI row, Has sch db schema, Has tab0 schema ('Table table))

=> Aliased (QualifiedAlias sch) (tab ::: tab0)

table to delete from

-> UsingClause with db params from

-> Condition 'Ungrouped '[] with db params ((tab ::: TableToRow table) ': from)

condition under which to delete a row

-> ReturningClause with db params ((tab ::: TableToRow table) ': from) row

results to return

-> Manipulation with db params row

Delete rows from a table.

>>> type Columns = '["col1" ::: 'Def :=> 'NotNull 'PGint4, "col2" ::: 'NoDef :=> 'NotNull 'PGint4]
>>> type Schema = '["tab1" ::: 'Table ('[] :=> Columns), "tab2" ::: 'Table ('[] :=> Columns)]
>>> :{
let
  manp :: Manipulation with (Public Schema) '[] '["col1" ::: 'NotNull 'PGint4, "col2" ::: 'NotNull 'PGint4]
  manp = deleteFrom #tab1 (Using (table #tab2)) (#tab1 ! #col1 .== #tab2 ! #col2) (Returning (#tab1 & DotStar))
in printSQL manp
:}
DELETE FROM "tab1" AS "tab1" USING "tab2" AS "tab2" WHERE ("tab1"."col1" = "tab2"."col2") RETURNING "tab1".*

deleteFrom_

Arguments

:: (Has sch db schema, Has tab0 schema ('Table table))

=> Aliased (QualifiedAlias sch) (tab ::: tab0)

table to delete from

-> Condition 'Ungrouped '[] with db params '[tab ::: TableToRow table]

condition under which to delete a row

-> Manipulation with db params '[]

Delete rows returning Nil.

>>> type Columns = '["col1" ::: 'Def :=> 'NotNull 'PGint4]
>>> type Schema = '["tab" ::: 'Table ('[] :=> Columns)]
>>> :{
let
  manp :: Manipulation with (Public Schema) '[ 'NotNull 'PGint4] '[]
  manp = deleteFrom_ (#tab `as` #t) (#t ! #col1 .== param @1)
in printSQL manp
:}
DELETE FROM "tab" AS "t" WHERE ("t"."col1" = ($1 :: int4))