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Ability to add descending order indexes (#262)

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* DescIndex(column) for descending index columns, refs #260
* Ability to add desc indexes using CLI, closes #260
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Simon Willison 2021-05-28 22:01:38 -07:00 • committed by GitHub
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6 changed files with 69 additions and 4 deletions
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sqlite_utils/cli.py
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@ -5,7 +5,7 @@ from datetime import datetime
import hashlib
import pathlib
import sqlite_utils
from sqlite_utils.db import AlterError
from sqlite_utils.db import AlterError, DescIndex
import textwrap
import io
import itertools
@ -450,11 +450,21 @@ def index_foreign_keys(path, load_extension):
)
@load_extension_option
def create_index(path, table, column, name, unique, if_not_exists, load_extension):
"Add an index to the specified table covering the specified columns"
"""
Add an index to the specified table covering the specified columns.
Use "sqlite-utils create-index mydb -- -column" to specify descending
order for a column.
"""
db = sqlite_utils.Database(path)
_load_extensions(db, load_extension)
# Treat -prefix as descending for columns
columns = []
for col in column:
if col.startswith("-"):
col = DescIndex(col[1:])
columns.append(col)
db[table].create_index(
column, index_name=name, unique=unique, if_not_exists=if_not_exists
columns, index_name=name, unique=unique, if_not_exists=if_not_exists
)