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feat(fk): Foreign Key Enforcement — ON DELETE/UPDATE CASCADE, SET NULL, RESTRICT

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- Add tkRestrict token to lexer
- Parse ON DELETE CASCADE/SET NULL/RESTRICT and ON UPDATE CASCADE/SET NULL/RESTRICT
  in both table-level and column-level FK constraints
- Add fkOnDelete/fkOnUpdate to ColumnDef and ForeignKeyDef
- Fix table-level FK constraint application (third pass after columns are created)
- Implement enforceFkOnDelete, enforceFkOnUpdate, enforceFkOnChildUpdate helpers
- Wire FK enforcement into DELETE and UPDATE execution paths
- Add 9 regression tests covering all FK actions
This commit is contained in:
dimgigov
2026-05-17 13:02:39 +03:00
parent dc4ad86ee1
commit 2e0969245c
4 changed files with 312 additions and 2 deletions
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src/barabadb/query/parser.nim
+54 -1
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@@ -984,6 +984,40 @@ proc parseCreateTable(p: var Parser): Node =
discard p.advance()
discard p.match(tkNull)
cst.cstOnDelete = "SET NULL"
elif p.peek().kind == tkRestrict:
discard p.advance()
cst.cstOnDelete = "RESTRICT"
elif p.peek().kind == tkUpdate:
discard p.advance()
if p.peek().kind == tkCascade:
discard p.advance()
cst.cstOnUpdate = "CASCADE"
elif p.peek().kind == tkSet:
discard p.advance()
discard p.match(tkNull)
cst.cstOnUpdate = "SET NULL"
elif p.peek().kind == tkRestrict:
discard p.advance()
cst.cstOnUpdate = "RESTRICT"
elif p.peek().kind == tkSet:
discard p.advance()
discard p.match(tkNull)
cst.cstOnDelete = "SET NULL"
elif p.peek().kind == tkRestrict:
discard p.advance()
cst.cstOnDelete = "RESTRICT"
elif p.peek().kind == tkUpdate:
discard p.advance()
if p.peek().kind == tkCascade:
discard p.advance()
cst.cstOnUpdate = "CASCADE"
elif p.peek().kind == tkSet:
discard p.advance()
discard p.match(tkNull)
cst.cstOnUpdate = "SET NULL"
elif p.peek().kind == tkRestrict:
discard p.advance()
cst.cstOnUpdate = "RESTRICT"
elif p.match(tkUnique):
cst.cstType = "unique"
if p.peek().kind == tkLParen:
@@ -1031,7 +1065,7 @@ proc parseCreateTable(p: var Parser): Node =
colDef.cdType = "BIGINT"
# Parse column constraints
while p.peek().kind in {tkPrimary, tkNot, tkNull, tkUnique, tkCheck, tkDefault, tkReferences, tkAutoIncrement}:
while p.peek().kind in {tkPrimary, tkNot, tkNull, tkUnique, tkCheck, tkDefault, tkReferences, tkAutoIncrement, tkOn}:
let cst = Node(kind: nkConstraintDef)
cst.cstColumns = @[colName]; cst.cstRefColumns = @[]
if p.match(tkPrimary):
@@ -1071,6 +1105,25 @@ proc parseCreateTable(p: var Parser): Node =
if p.peek().kind == tkCascade:
discard p.advance()
cst.cstOnDelete = "CASCADE"
elif p.peek().kind == tkSet:
discard p.advance()
discard p.match(tkNull)
cst.cstOnDelete = "SET NULL"
elif p.peek().kind == tkRestrict:
discard p.advance()
cst.cstOnDelete = "RESTRICT"
elif p.peek().kind == tkUpdate:
discard p.advance()
if p.peek().kind == tkCascade:
discard p.advance()
cst.cstOnUpdate = "CASCADE"
elif p.peek().kind == tkSet:
discard p.advance()
discard p.match(tkNull)
cst.cstOnUpdate = "SET NULL"
elif p.peek().kind == tkRestrict:
discard p.advance()
cst.cstOnUpdate = "RESTRICT"
colDef.cdConstraints.add(cst)
result.crtColumns.add(colDef)