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db.enable_counts() method, closes #213

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This commit is contained in:
Simon Willison 2021-01-02 14:03:52 -08:00
commit 9a5c92b63e
3 changed files with 55 additions and 3 deletions
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23
sqlite_utils/db.py
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@ -145,6 +145,11 @@ class InvalidColumns(Exception):
class Database:
_counts_table_name = "_counts"
_counts_table_create = "CREATE TABLE IF NOT EXISTS [{}]([table] TEXT PRIMARY KEY, count INTEGER DEFAULT 0);".format(
_counts_table_name
)
def __init__(
self,
filename_or_conn=None,
@ -279,6 +284,19 @@ class Database:
if self.journal_mode != "delete":
self.execute("PRAGMA journal_mode=delete;")
def _ensure_counts_table(self):
with self.conn:
self.execute(self._counts_table_create)
def enable_counts(self):
self._ensure_counts_table()
for table in self.tables:
if (
table.virtual_table_using is None
and table.name != self._counts_table_name
):
table.enable_counts()
def execute_returning_dicts(self, sql, params=None):
cursor = self.execute(sql, params or tuple())
keys = [d[0] for d in cursor.description]
@ -1178,7 +1196,7 @@ class Table(Queryable):
sql = (
textwrap.dedent(
"""
CREATE TABLE IF NOT EXISTS [{counts_table}]([table] TEXT PRIMARY KEY, count INTEGER DEFAULT 0);
{create_counts_table}
CREATE TRIGGER IF NOT EXISTS [{table}{counts_table}_insert] AFTER INSERT ON [{table}]
BEGIN
INSERT OR REPLACE INTO [{counts_table}]
@ -1206,7 +1224,8 @@ class Table(Queryable):
)
.strip()
.format(
counts_table="_counts",
create_counts_table=self.db._counts_table_create,
counts_table=self.db._counts_table_name,
table=self.name,
table_quoted=self.db.escape(self.name),
)