1.在mysql客户机会话中,检查当前隔离级别。
2.使用PROMPT语句,将上一步打开的mysql会话中提示符改为t1,以便将其与后面的客户机会话区别开来。
3.在t1 mysql会话中启动一个新事务。
4.在t1会话中,选择city表中的ID>4070的所有行。
5.在另一个终端窗口中打开第二个mysql会话,将该mysql会话中的提示符更改为t2
6.在t2会话中,启动一个新事务,选择city表中的ID>4070的所有行。
7.在t2会话中,向city表中插入新的一行,确认新行已经加入。
1.
mysql> select @@global.tx_isolation; +-----------------------+ | @@global.tx_isolation | +-----------------------+ | REPEATABLE-READ | +-----------------------+ 1 row in set (0.00 sec)
2.
mysql> prompt t1>; PROMPT set to ‘t1>‘ t1>start transaction; Query OK, 0 rows affected (0.00 sec)
3.
t1>use world Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed
4.
t1>select * from city where id >4070; +------+--------------+-------------+------------+------------+ | ID | Name | CountryCode | District | Population | +------+--------------+-------------+------------+------------+ | 4071 | Mount Darwin | ZWE | Harare | 164362 | | 4072 | Mutare | ZWE | Manicaland | 131367 | | 4073 | Gweru | ZWE | Midlands | 128037 | | 4074 | Gaza | PSE | Gaza | 353632 | | 4075 | Khan Yunis | PSE | Khan Yunis | 123175 | | 4076 | Hebron | PSE | Hebron | 119401 | | 4077 | Jabaliya | PSE | North Gaza | 113901 | | 4078 | Nablus | PSE | Nablus | 100231 | | 4079 | Rafah | PSE | Rafah | 92020 | +------+--------------+-------------+------------+------------+ 9 rows in set (0.00 sec)
5.
t1>prompt t2>; PROMPT set to ‘t2>‘ t2> t2>start transaction; Query OK, 0 rows affected (0.00 sec)
6.
t2>use world; Database changed t2>select * from city where id >4070; +------+--------------+-------------+------------+------------+ | ID | Name | CountryCode | District | Population | +------+--------------+-------------+------------+------------+ | 4071 | Mount Darwin | ZWE | Harare | 164362 | | 4072 | Mutare | ZWE | Manicaland | 131367 | | 4073 | Gweru | ZWE | Midlands | 128037 | | 4074 | Gaza | PSE | Gaza | 353632 | | 4075 | Khan Yunis | PSE | Khan Yunis | 123175 | | 4076 | Hebron | PSE | Hebron | 119401 | | 4077 | Jabaliya | PSE | North Gaza | 113901 | | 4078 | Nablus | PSE | Nablus | 100231 | | 4079 | Rafah | PSE | Rafah | 92020 | +------+--------------+-------------+------------+------------+ 9 rows in set (0.00 sec)
7.
t2>insert into city (name,countrycode) values (‘new city‘,‘ata‘); Query OK, 1 row affected (0.00 sec) t2>select * from city where id >4070; +------+--------------+-------------+------------+------------+ | ID | Name | CountryCode | District | Population | +------+--------------+-------------+------------+------------+ | 4071 | Mount Darwin | ZWE | Harare | 164362 | | 4072 | Mutare | ZWE | Manicaland | 131367 | | 4073 | Gweru | ZWE | Midlands | 128037 | | 4074 | Gaza | PSE | Gaza | 353632 | | 4075 | Khan Yunis | PSE | Khan Yunis | 123175 | | 4076 | Hebron | PSE | Hebron | 119401 | | 4077 | Jabaliya | PSE | North Gaza | 113901 | | 4078 | Nablus | PSE | Nablus | 100231 | | 4079 | Rafah | PSE | Rafah | 92020 | | 4080 | new city | ata | | 0 | +------+--------------+-------------+------------+------------+ 10 rows in set (0.00 sec)
8.
t2>prompt t1>; PROMPT set to ‘t1>‘ t1>start transaction; Query OK, 0 rows affected (0.01 sec) t1>commit; Query OK, 0 rows affected (0.00 sec)
9.
t1>select * from city where id >4070; +------+--------------+-------------+------------+------------+ | ID | Name | CountryCode | District | Population | +------+--------------+-------------+------------+------------+ | 4071 | Mount Darwin | ZWE | Harare | 164362 | | 4072 | Mutare | ZWE | Manicaland | 131367 | | 4073 | Gweru | ZWE | Midlands | 128037 | | 4074 | Gaza | PSE | Gaza | 353632 | | 4075 | Khan Yunis | PSE | Khan Yunis | 123175 | | 4076 | Hebron | PSE | Hebron | 119401 | | 4077 | Jabaliya | PSE | North Gaza | 113901 | | 4078 | Nablus | PSE | Nablus | 100231 | | 4079 | Rafah | PSE | Rafah | 92020 | | 4080 | new city | ata | | 0 | +------+--------------+-------------+------------+------------+ 10 rows in set (0.01 sec)
10.
t1>start transaction; Query OK, 0 rows affected (0.00 sec) t1>delete from city where id =4080; Query OK, 1 row affected (0.00 sec) t1>select * from city where id >4070; +------+--------------+-------------+------------+------------+ | ID | Name | CountryCode | District | Population | +------+--------------+-------------+------------+------------+ | 4071 | Mount Darwin | ZWE | Harare | 164362 | | 4072 | Mutare | ZWE | Manicaland | 131367 | | 4073 | Gweru | ZWE | Midlands | 128037 | | 4074 | Gaza | PSE | Gaza | 353632 | | 4075 | Khan Yunis | PSE | Khan Yunis | 123175 | | 4076 | Hebron | PSE | Hebron | 119401 | | 4077 | Jabaliya | PSE | North Gaza | 113901 | | 4078 | Nablus | PSE | Nablus | 100231 | | 4079 | Rafah | PSE | Rafah | 92020 | +------+--------------+-------------+------------+------------+ 9 rows in set (0.00 sec)
时间: 2024-10-14 22:15:54