如何在 Python 3.7 中使用带有 sqlite3 python 模块的 FTS5 扩展? [英] How can I use the FTS5 extension with the sqlite3 python module with Python 3.7?

问题描述

如何在 Python 3.7 中使用 FTS5 扩展和 sqlite3 python 模块?

How can I use the FTS5 extension with the sqlite3 python module with Python 3.7?

我尝试使用 python testFTS5.py 在 Python 中运行以下代码:

I tried to run the following code in Python with python testFTS5.py:

import sqlite3
conn = sqlite.connect('some_db.db')
sqlite.enable_load_extension(True)
sqlite.load_extension('fts5') 

导致错误消息:

Traceback (most recent call last):
  File "./src/test.py", line 3, in <module>
    sqlite.enable_load_extension(True)
AttributeError: module 'sqlite3' has no attribute 'enable_load_extension'

我尝试了 sqlite.load_extension('FTS5') 和 sqlite.load_extension('ENABLE_FTS5') 但不出所料地产生了相同的错误消息(相应的文件名是未找到).我还尝试使用 LD_LIBRARY_PATH=/usr/local/bin python testFTS5.py 运行代码，但我收到相同的错误消息.

I tried sqlite.load_extension('FTS5') and sqlite.load_extension('ENABLE_FTS5') but it unsurprisingly yields the same error message (with the corresponding filename being not found). I also tried running the code with LD_LIBRARY_PATH=/usr/local/bin python testFTS5.py but I get the same error message.

我通过在终端中运行以下代码检查了 sqlite3 位置:

I checked the sqlite3 location by running the following code in the terminal:

derno@ompn:/mnt/ilcompn0d1/user/dernonco/fts-test$ which sqlite3
/usr/local/bin/sqlite3

并且我列出了已安装的 sqlite3 扩展:

and I listed the installed sqlite3 extensions:

derno@ompn:/mnt/ilcompn0d1/user/dernonco/fts-test$ sqlite3
SQLite version 3.18.0 2017-03-28 18:48:43
Enter ".help" for usage hints.
Connected to a transient in-memory database.
Use ".open FILENAME" to reopen on a persistent database.
sqlite> pragma compile_options;
COMPILER=gcc-5.4.0 20160609
DEFAULT_SYNCHRONOUS=2
DEFAULT_WAL_SYNCHRONOUS=2
ENABLE_FTS5
ENABLE_RTREE
SYSTEM_MALLOC
THREADSAFE=1

这似乎表明 FTS5 在我的 /usr/local/bin/sqlite3 版本中可用.

which seems to indicate that the FTS5 is available in my /usr/local/bin/sqlite3 version.

但是当我跑步时

import sqlite3

con = sqlite3.connect(':memory:')
cur = con.cursor()
cur.execute('pragma compile_options;')
available_pragmas = cur.fetchall()
con.close()

print(available_pragmas)

它输出:

[('COMPILER=gcc-5.4.0 20160609',), ('DEFAULT_SYNCHRONOUS=2',), ('DEFAULT_WAL_SYNCHRONOUS=2',), 
('ENABLE_FTS3',), ('ENABLE_RTREE',), ('SYSTEM_MALLOC',), ('THREADSAFE=1',)]

该列表中没有 ENABLE_FTS5.

我尝试使用 Python 3.7.6(默认，2019 年 12 月 19 日，23:49:42)和 Python 3.6.7(默认，2018 年 10 月 25 日，09:16:13).

I tried with Python 3.7.6 (default, Dec 19 2019, 23:49:42) and Python 3.6.7 (default, Oct 25 2018, 09:16:13).

推荐答案

你会在连接上调用 .enable_load_extension(True) 和 .load_extension('fts5')对象，而不是在模块上.

You would call .enable_load_extension(True) and .load_extension('fts5') on the connection object, and not on the module.

但是，这应该不是必需的，因为 - 正如您所看到的 - 您的安装支持全文搜索.

However, this shouldn't be necessary since -- as you've seen -- your installation supports full-text search.

您可以通过以下方式进行测试以确保:

Here's a way you can test that out just to be sure:

import sqlite3 

conn = sqlite3.connect(':memory:')
conn.execute("""create virtual table fts5test using fts5 (data);""") 
conn.execute("""insert into fts5test (data) 
                values ('this is a test of full-text search');""")
conn.execute("""select * from fts5test where data match 'full';""").fetchall() 

结果:

In [67]: conn.execute("""select * from fts5test where data match 'full';""").fetchall()
Out[67]: [('this is a test of full-text search',)]

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