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add str_replace and str_replace_all for Oracle backend #1402

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Merged
hadley merged 6 commits into from
Dec 22, 2023
Merged

add str_replace and str_replace_all for Oracle backend #1402

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e978faf
add str_replace and str_replace_all for Oracle backend
thomashulst Nov 9, 2023
c1b015a
added snapshot tests and news bullet
thomashulst Dec 22, 2023
b70da09
Merged origin/main into thomashulst-add-str_replace-Oracle
hadley Dec 22, 2023
7dc7227
Fix bullet format
hadley Dec 22, 2023
5440436
Add snapshot tests
hadley Dec 22, 2023
6ca5903
Tweak snapshot tests
hadley Dec 22, 2023
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3 changes: 3 additions & 0 deletions NEWS.md
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Original file line number Diff line number Diff line change
@@ -1,5 +1,8 @@
# dbplyr (development version)

* Oracle: Added support for `str_replace()` and `str_replace_all()` via
`REGEXP_REPLACE()` (@thomashulst, #1402).

* Allow additional arguments to be passed from `compute()` all the way to
`sql_query_save()`-method (@rsund).

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10 changes: 10 additions & 0 deletions R/backend-oracle.R
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Expand Up @@ -133,6 +133,16 @@ sql_translation.Oracle <- function(con) {
paste0 = sql_paste_infix("", "||", function(x) sql_expr(cast(!!x %as% text))),
str_c = sql_paste_infix("", "||", function(x) sql_expr(cast(!!x %as% text))),

# https://docs.oracle.com/en/database/oracle/oracle-database/19/sqlrf/REGEXP_REPLACE.html
# 4th argument is starting position (default: 1 => first char of string)
# 5th argument is occurrence (default: 0 => match all occurrences)
str_replace = function(string, pattern, replacement){
sql_expr(regexp_replace(!!string, !!pattern, !!replacement, 1L, 1L))
},
str_replace_all = function(string, pattern, replacement){
sql_expr(regexp_replace(!!string, !!pattern, !!replacement))
},

# lubridate --------------------------------------------------------------
today = function() sql_expr(TRUNC(CURRENT_TIMESTAMP)),
now = function() sql_expr(CURRENT_TIMESTAMP)
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11 changes: 11 additions & 0 deletions tests/testthat/_snaps/backend-oracle.md
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@@ -1,3 +1,14 @@
# string functions translate correctly

Code
test_translate_sql(str_replace(col, "pattern", "replacement"))
Output
<SQL> REGEXP_REPLACE(`col`, 'pattern', 'replacement', 1, 1)
Code
test_translate_sql(str_replace_all(col, "pattern", "replacement"))
Output
<SQL> REGEXP_REPLACE(`col`, 'pattern', 'replacement')

# queries translate correctly

Code
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10 changes: 10 additions & 0 deletions tests/testthat/test-backend-oracle.R
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Expand Up @@ -16,6 +16,16 @@ test_that("paste and paste0 translate correctly", {
expect_equal(test_translate_sql(str_c(x, y)), sql("`x` || `y`"))
})


test_that("string functions translate correctly", {
local_con(simulate_oracle())

expect_snapshot({
test_translate_sql(str_replace(col, "pattern", "replacement"))
test_translate_sql(str_replace_all(col, "pattern", "replacement"))
})
})

test_that("queries translate correctly", {
mf <- lazy_frame(x = 1, con = simulate_oracle())
expect_snapshot(mf %>% head())
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