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basic_example_v1: added comments on TablePathPrefix usage to avoid confusion #44

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Aug 24, 2022
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basic_example_v1: added comments on TablePathPrefix usage to avoid confusion #44

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basic_example_v1: added comments on TablePathPrefix usage to avoid co…
zinal Aug 17, 2022
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Merge branch 'main' into ex_basic-example_p2
gridnevvvit Aug 24, 2022
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13 changes: 13 additions & 0 deletions examples/basic_example_v1/basic_example.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,17 @@
import ydb
import basic_example_data

# Table path prefix allows to put the working tables into the specific directory
# inside the YDB database. Putting `PRAGMA TablePathPrefix("some/path")`
# at the beginning of the query allows to reference the tables through
# their names "under" the specified directory.
#
# TablePathPrefix can be defined as an absolute path (starting with slash),
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This phrase is interesting, does table path prefix supports relative path for YDB?

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This phrase is interesting, does table path prefix supports relative path for YDB?

Good point. Seems that I was confused by the docs, in particular with that thing: https://ydb.tech/ru/docs/yql/reference/syntax/pragma#table-path-prefix

Hard to understand why does it need the database part on the first place...

# or as a relative path. Absolute path has to be started with the current
# database location.
#
# https://ydb.tech/ru/docs/yql/reference/syntax/pragma#table-path-prefix

FillDataQuery = """PRAGMA TablePathPrefix("{}");

DECLARE $seriesData AS List<Struct<
Expand Down Expand Up @@ -309,6 +320,8 @@ def run(endpoint, database, path):

ensure_path_exists(driver, database, path)

# absolute path - prefix to the table's names,
# including the database location
full_path = posixpath.join(database, path)

create_tables(pool, full_path)
Expand Down