我编写了以下代码,显示sqlite3.OperationalError: database is locked
错误。任何有关调试的帮助都将非常感激。
基本上我试图将数据从table1复制到table2,并根据其他应用程序发生在table1上的更改将数据插入到table2中。
看起来我错过了一些部分。
import sqlite3
conn = sqlite3.connect("/home/sid/.Skype/testmasterut/main.db")
cursor = conn.cursor()
createLogTableSql = """create table IF NOT EXISTS sid_log as select id as "s_id",author as "s_author",timestamp as "s_timestamp",edited_by as "s_editedby",edited_timestamp as "s_edited_timestamp",body_xml as "s_body_xml" from Messages"""
cursor.execute(createLogTableSql)
conn.commit()
print "Table to save the old messages has been created"
selectLog = """ select * from sid_log """
original_table = cursor.execute(selectLog)
cursor2 = conn.cursor()
cursor3 = conn.cursor()
cursor4 = conn.cursor()
InsertTest = """ insert or ignore into sid_log (s_id,s_author,s_timestamp,s_editedby,s_edited_timestamp,s_body_xml)
select id,author,timestamp,edited_by,edited_timestamp,body_xml from Messages where id not in (select s_id from sid_log where s_id = id) and edited_by is NULL and edited_timestamp is NULL
"""
EditedTest = """ select * from Messages where id in (select s_id from sid_log where s_id = id) and edited_by is not NULL and edited_timestamp is not NULL"""
conn.close()
while True:
conn2 = sqlite3.connect("/home/sid/.Skype/testmasterut/main.db",timeout=3)
conn2.execute(InsertTest)
print "Total number of rows changed:", conn.total_changes
EditedTest2 = """ select * from Messages where id in (select s_id from sid_log where s_id = id) and edited_by is not NULL and edited_timestamp is not NULL"""
edited_list = conn2.execute(EditedTest2)
conn2.commit()
conn2.close()
# for row in edited_list:
# queryString = "SELECT * FROM sid_log WHERE s_id IN (%s)" % str(row[0])
# original_message = conn.execute(queryString)
# for org_row in original_message:
# print "Message edited from", org_row[5], "to", row[5]
修改 以下是追溯
Traceback (most recent call last):
File "try2.py", line 28, in <module>
conn2.execute(InsertTest)
sqlite3.OperationalError: database is locked
答案 0 :(得分:6)
我不确定这是否会对任何人有所帮助,但我找到了解决我自己的锁定数据库问题的方法。
我使用PyCharm并发现我正在处理的脚本的几个实例都在运行。这通常是由于我正在测试的代码中的错误,但它保持活动状态(因此与db的连接仍处于活动状态)。关闭那些(停止所有过程)并再试一次 - 它每次都适合我!
如果有人知道在一段时间后让它超时的方法,请评论此解决方案。我试过cur.execute("PRAGMA busy_timeout = 30000")
(从另一个线程中找到类似的问题),但似乎没有做任何事情。
答案 1 :(得分:4)
&#34;数据库被锁定&#34;表示某些其他连接具有活动连接。
使用PRAGMA busy_timeout等待一段时间让其他交易完成:
conn.execute("PRAGMA busy_timeout = 30000") # 30 s
但是,如果其他应用程序故意保持打开的事务以保持数据库锁定,那么您无能为力。
答案 2 :(得分:0)
cursor2 = conn.cursor()
"""EDIT YOUR DATABASE USING CODE AND CLOSE THE CONNECTION"""
connection.close()
cursor3 = conn.cursor()
"""EDIT YOUR DATABASE USING CODE AND CLOSE THE CONNECTION"""
connection.close()
cursor4 = conn.cursor()
"""EDIT YOUR DATABASE USING CODE AND CLOSE THE CONNECTION"""
connection.close()
我认为您必须关闭已打开的连接,可能是错误是因为您已打开多个连接。
#include <stdio.h>
#include <limits.h>
#define LARGEST(x,y) ( (x) > (y) ? (x) : (y) )
int main()
{
int a = INT_MIN;
int i = 0;
for(i=0; i<5; i++)
{
int x = 0;
printf("Enter the value of X:\n");
scanf("%d", &x);
a = LARGEST(x, a);
}
printf("%d", a);
}
答案 3 :(得分:0)
我遇到了同样的问题,但是当我使用以下内容关闭并发连接时,它已得到解决。
conn.close()
所以,如果你的程序是这样开始的:
import sqlite3
conn = sqlite3.connect('pg_example.db', timeout=10)
c = conn.cursor()
确保在每个SQL语句之后包含conn.close()
t = ('RHAT',)
c.execute('SELECT * FROM stocks WHERE symbol=?', t)
conn.commit()
conn.close() #This is the one you need