mirror of https://github.com/zulip/zulip.git
47 lines
1.4 KiB
Python
47 lines
1.4 KiB
Python
from psycopg2.extensions import cursor
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from psycopg2.sql import Composable, Identifier, SQL
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from typing import List, TypeVar
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import time
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CursorObj = TypeVar('CursorObj', bound=cursor)
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def do_batch_update(cursor: CursorObj,
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table: str,
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assignments: List[Composable],
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batch_size: int=10000,
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sleep: float=0.1) -> None: # nocoverage
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# The string substitution below is complicated by our need to
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# support multiple postgres versions.
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stmt = SQL('''
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UPDATE {}
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SET {}
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WHERE id >= %s AND id < %s
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''').format(
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Identifier(table),
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SQL(', ').join(assignments),
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)
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cursor.execute(SQL("SELECT MIN(id), MAX(id) FROM {}").format(Identifier(table)))
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(min_id, max_id) = cursor.fetchone()
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if min_id is None:
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return
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print("\n Range of rows to update: [%s, %s]" % (min_id, max_id))
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while min_id <= max_id:
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lower = min_id
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upper = min_id + batch_size
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print(' Updating range [%s,%s)' % (lower, upper))
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cursor.execute(stmt, [lower, upper])
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min_id = upper
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time.sleep(sleep)
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# Once we've finished, check if any new rows were inserted to the table
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if min_id > max_id:
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cursor.execute(SQL("SELECT MAX(id) FROM {}").format(Identifier(table)))
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(max_id,) = cursor.fetchone()
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print(" Finishing...", end='')
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