lloeki/rebel
1
0
Fork 0
mirror of https://github.com/lloeki/rebel.git synced 2025-12-06 01:54:40 +01:00
Code Issues Projects Releases Packages Wiki Activity

Normalize best-effort vs strict operator usage

Browse source
This commit is contained in:
Loic Nageleisen 2017-11-22 17:22:27 +01:00
parent 354f4a6860
commit 6ffa4e88f0
3 changed files with 76 additions and 22 deletions
Download patch file Download diff file Expand all files Collapse all files

54
README.md
View file

@ -213,6 +213,60 @@ Rebel::SQL() { select count(:id).as(:count), from: :customers, where: { :age =>
# While we're counting things, let's group results
Rebel::SQL() { select count(:id).as(:count), :country, from: :customers, group: by(:country).having(count(:customer_id) => 5) }
#=> SELECT COUNT("id") AS "count", "country" FROM "customers" GROUP BY "country" HAVING COUNT("customer_id") = 5
# Passing a hash does a best effort to map Ruby to SQL
Rebel::SQL() { select :id, from: :customers, where: { :age => 42 } }
#=> SELECT "id" FROM "customers" WHERE "age" = 42
Rebel::SQL() { select :id, from: :customers, where: { :age => [20, 21, 22] } }
#=> SELECT "id" FROM "customers" WHERE "age" IN (20, 21, 22)
Rebel::SQL() { select :id, from: :customers, where: { :age => nil } }
#=> SELECT "id" FROM "customers" WHERE "age" IS NULL
# Using operators ensures the expected SQL operator is used
Rebel::SQL() { select :id, from: :customers, where: name(:age).eq(42) }
#=> SELECT "id" FROM "customers" WHERE "age" = 42
Rebel::SQL() { select :id, from: :customers, where: name(:age).eq(nil) }
#=> SELECT "id" FROM "customers" WHERE "age" = NULL
Rebel::SQL() { select :id, from: :customers, where: name(:age).ne(42) }
#=> SELECT "id" FROM "customers" WHERE "age" != NULL
Rebel::SQL() { select :id, from: :customers, where: name(:age).is(42) }
#=> SELECT "id" FROM "customers" WHERE "age" IS 42
Rebel::SQL() { select :id, from: :customers, where: name(:age).is(nil) }
#=> SELECT "id" FROM "customers" WHERE "age" IS NULL
Rebel::SQL() { select :id, from: :customers, where: name(:age).is_not(nil) }
#=> SELECT "id" FROM "customers" WHERE "age" IS NOT NULL
# Other operators are available
Rebel::SQL() { select :id, from: :customers, where: name(:age).ge(42) }
#=> SELECT "id" FROM "customers" WHERE "age" >= 42
Rebel::SQL() { select :id, from: :customers, where: name(:age).in(21, 22, 23) }
#=> SELECT "id" FROM "customers" WHERE "age" IN (21, 22, 23)
Rebel::SQL() { select :id, from: :customers, where: name(:first_name).like("J%") }
#=> SELECT "id" FROM "customers" WHERE "first_name" LIKE "J%"
# Aliases to overload operators are available
Rebel::SQL() { select :id, from: :customers, where: name(:age) == 42 }
#=> SELECT "id" FROM "customers" WHERE "age" = 42
Rebel::SQL() { select :id, from: :customers, where: name(:age) < 42 }
#=> SELECT "id" FROM "customers" WHERE "age" < 42
Rebel::SQL() { select :id, from: :customers, where: name(:age) >= 42 }
#=> SELECT "id" FROM "customers" WHERE "age" >= 42
Rebel::SQL() { select :id, from: :customers, where: name(:age) != 42 }
#=> SELECT "id" FROM "customers" WHERE "age" != 42
# Conditions can be combined
Rebel::SQL() { select :id, from: :customers, where: name(:age).gt(42).or(name(:age).lt(21)) }
#=> SELECT "id" FROM "customers" WHERE ("age" > 42 OR "age" < 21)
Rebel::SQL() { select :id, from: :customers, where: (name(:age) < 42).and(name(:age) > 21) }
#=> SELECT "id" FROM "customers" WHERE ("age" < 42 AND "age" > 21)
# Binary-wise operators can be used to tie conditions
# WARNING: Usefulness if this hack is still debated. It might be removed in the future.
Rebel::SQL() { select :id, from: :customers, where: ((name(:age) > 42) | (name(:age) < 21)) }
#=> SELECT "id" FROM "customers" WHERE ("age" > 42 OR "age" < 21)
Rebel::SQL() { select :id, from: :customers, where: name(:age).lt(42) & (name(:age).gt(21)) }
#=> SELECT "id" FROM "customers" WHERE ("age" < 42 AND "age" > 21)
```
### Query execution