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Erik Johnston 2019-05-17 16:40:51 +01:00
parent 895179a4dc
commit 8dd9cca8ea
1 changed files with 9 additions and 5 deletions
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synapse/storage/stream.py
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@ -78,12 +78,12 @@ def generate_pagination_where_clause(
would be generated for dir=b, from_token=(6, 7) and to_token=(5, 3). would be generated for dir=b, from_token=(6, 7) and to_token=(5, 3).
Note that tokens are considered to be after the row they are in, e.g. if Note that tokens are considered to be after the row they are in, e.g. if
a row A has a token T, then we consider A to be before T. This covention a row A has a token T, then we consider A to be before T. This convention
is important when figuring out inequalities for the generated SQL, and is important when figuring out inequalities for the generated SQL, and
produces the following result: produces the following result:
- If paginatiting forwards then we exclude any rows matching the from - If paginating forwards then we exclude any rows matching the from
token, but include those that match the to token. token, but include those that match the to token.
- If paginatiting backwards then we include any rows matching the from - If paginating backwards then we include any rows matching the from
token, but include those that match the to token. token, but include those that match the to token.
Args: Args:
@ -92,8 +92,12 @@ def generate_pagination_where_clause(
column_names (tuple[str, str]): The column names to bound. Must *not* column_names (tuple[str, str]): The column names to bound. Must *not*
be user defined as these get inserted directly into the SQL be user defined as these get inserted directly into the SQL
statement without escapes. statement without escapes.
from_token (tuple[int, int]|None) from_token (tuple[int, int]|None): The start point for the pagination.
to_token (tuple[int, int]|None) This is an exclusive minimum bound if direction is "f", and an
inclusive maximum bound if direction is "b".
to_token (tuple[int, int]|None): The endpoint point for the pagination.
This is an inclusive maximum bound if direction is "f", and an
exclusive minimum bound if direction is "b".
engine: The database engine to generate the clauses for engine: The database engine to generate the clauses for
Returns: Returns: