我正在尝试将保存点与python 2.6中内置的sqlite3模块一起使用.每次我尝试释放或回滚保存点时,我总是收到一个OperationalError：没有这样的保存点.我错过了什么？
python version: 2.6.4 (r264:75821M,Oct 27 2009,19:48:32)
[GCC 4.0.1 (Apple Inc. build 5493)]
Pysqlite version: 2.4.1
sqlite3 version: 3.6.11
Traceback (most recent call last):
File "spDemo.py",line 21,in sqlite3.OperationalError: no such savepoint: spTest
从这段代码：
import sys
import sqlite3
print 'python version:',sys.version
print 'Pysqlite version:',sqlite3.version
print 'sqlite3 version:',sqlite3.sqlite_version
print
conn = sqlite3.connect('db_spDemo.db')
conn.isolation_level = "DEFERRED"
with conn:
conn.execute("create table example (A,B);")
with conn:
conn.execute("insert into example values (?,?);",(0,200))
conn.execute("savepoint spTest;")
conn.execute("insert into example values (?,(1,201))
conn.execute("insert into example values (?,(2,202))
conn.execute("release savepoint spTest;")
conn.execute("insert into example values (?,(5,205))
最佳答案
这似乎是sqlite3模块如何与该隔离级别一起运行的结果.
这有效,请注意两个变化：
import sys
import sqlite3
print 'python version:',sqlite3.sqlite_version
print
conn = sqlite3.connect('shane.sqlite')
conn.isolation_level = None # CHANGED
with conn:
conn.execute("create table example (A,202))
conn.execute("rollback to savepoint spTest;") # CHANGED
conn.execute("insert into example values (?,205))
输出：
$python shane-sqlite3.py && sqlite3 shane.sqlite 'select * from example;' python version: 2.6.2 (release26-maint,Apr 19 2009,01:56:41) [GCC 4.3.3] Pysqlite version: 2.4.1 sqlite3 version: 3.6.10 0|200 5|205
这是一个令人不满意的答案,我没有在sqlite3模块文档中看到任何相关内容(我也没有尝试查看源代码).但我希望它能帮助您找到正确的方向.