78 lines
2.3 KiB
Markdown
78 lines
2.3 KiB
Markdown
## Better Python interface for `sqlite3`
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```python
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import sqlite3, json
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class DB(sqlite3.Connection):
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def __init__(self, db_name="db.sqlite"):
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super().__init__(db_name)
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with self:
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self.execute('''
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CREATE TABLE IF NOT EXISTS kv_store
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(key TEXT PRIMARY KEY, value BLOB)
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''')
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def __setitem__(self, key, value):
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if not isinstance(value, bytes): value = json.dumps(value)
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with self:
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cur = self.execute('''
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INSERT OR REPLACE INTO kv_store
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(key, value) VALUES (?, ?)
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''', (key, value))
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return {"modified_count": cur.rowcount}
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def __getitem__(self, key):
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with self:
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result = self.execute('''
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SELECT value FROM kv_store
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WHERE key = ?
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''', (key,)).fetchone()
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if result:
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if isinstance(result[0], str):
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try: return json.loads(result[0])
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except json.JSONDecodeError: pass
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return result[0]
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def delete(self, key):
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with self:
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cur = self.execute('''
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DELETE FROM kv_store
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WHERE key = ?
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''', (key,))
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return {"deleted_count": cur.rowcount}
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def keys(self, pattern='*'):
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pattern = pattern.translate(str.maketrans({
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'\\': '\\\\', '%': '\\%', '_': '\\_', '*': '%', '?': '_'
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}))
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with self:
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result = self.execute('''
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SELECT key FROM kv_store
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WHERE key LIKE ? ESCAPE '\\'
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''', (pattern,)).fetchall()
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return [row[0] for row in result]
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def __repr__(self): return repr(self.keys())
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```
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# Usage
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```python
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db = DB()
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# 문자열 저장 및 조회
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db['hello'] = 'world'
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print(db['hello']) # 출력: world (str 타입)
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# 숫자 저장 및 조회
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db['number'] = 42
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print(db['number']) # 출력: 42 (int 타입)
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# 바이너리 데이터 저장 및 조회
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db['binary'] = b'binary data'
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print(db['binary']) # 출력: b'binary data' (bytes 타입)
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# 복잡한 객체 저장
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complex_obj = {'name': 'John', 'age': 30, 'city': 'New York'}
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db['complex'] = complex_obj
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loaded_obj = db['complex']
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print(loaded_obj) # 출력: {'name': 'John', 'age': 30, 'city': 'New York'} (dict 타입)
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``` |