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import tempfile
from pprint import pformat, pprint
from log_db import Value, Bound, DB
# TODO: This should be imported from the log_db module
# but exporting type aliases does not work automatically
Record = list[Value]
class Inst:
def __init__(self, id: int, name: str):
self.id = id
self.name = name
def into_record(self) -> Record:
return [
Value.int(self.id),
Value.string(self.name),
]
@staticmethod
def from_record(rec: Record):
return Inst(
rec[0].as_int(),
rec[1].as_string(),
)
def __repr__(self) -> str:
return pformat(self.__dict__)
temp_dir = tempfile.TemporaryDirectory()
# Create a new database
db = DB \
.configure() \
.data_dir(temp_dir.name) \
.fields(["id", "name"]) \
.primary_key("id") \
.secondary_keys(["name"]) \
.initialize()
db.upsert(Inst(1, "foo").into_record())
#res = db.find_by("name", log_db.Value.string("foo"))
#insts = [Inst.from_record(r) for r in res]
res = db.range_by("name",
Bound.unbounded(),
Bound.unbounded(),
)
# insts = [Inst.from_record(r) for r in res]
res = db.find_by("name", Value.string("foo"))
print("before delete count:", len(res))
res = db.delete_by("name", Value.string("foo"))
#res = db.delete_by("id", Value.int(1))
print("deleted instances:")
for r in res:
pprint(Inst.from_record(r))
res = db.find_by("name", Value.string("foo"))
print("find name after delete count:", len(res))
res = db.find_by("id", Value.int(1))
print(f"find id after delete count: {len(res)}")
res = db.delete_by("name", Value.string("bar"))
db.tx_begin()
db.upsert(Inst(2, "bar").into_record())
db.tx_rollback()
res = db.find_by("name", Value.string("bar"))
print("find name after rollback count:", len(res))
db.tx_begin()
db.upsert(Inst(2, "bar").into_record())
db.tx_commit()
res = db.find_by("name", Value.string("bar"))
print("find name after commit count:", len(res))
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