借助 LOCK TABLES 命令，您可以实现多个表锁。语法如下 -

LOCK TABLES yourTableName1 WRITE;LOCK TABLES yourTableName2 WRITE;LOCK TABLES yourTableName3 WRITE;LOCK TABLES yourTableName4 WRITE;...N;

表锁不是事务安全的，它在尝试锁定第二个表之前首先隐式提交活动事务。

假设我有一个表 OrderDemo -

mysql> create table OrderDemo   -> (   -> OrderId int NOT NULL AUTO_INCREMENT PRIMARY KEY,   -> OrderPrice int,   -> OrderDatetime datetime   -> );Query OK, 0 rows affected (0.66 sec)

这里是锁定表 OrderDemo 和 utfdemo 的查询。 utfdemo 已存在于示例数据库中。查询如下 -

mysql> LOCK TABLES OrderDemo WRITE;Query OK, 0 rows affected (0.03 sec)mysql> LOCK TABLES utfdemo WRITE;Query OK, 0 rows affected (0.07 sec)

现在它锁定会话的表。如果您尝试创建表格，则会收到错误。

错误如下 -

mysql> create table LockTableDemo   -> (   -> UserId int,   -> UserName varchar(10)   -> );ERROR 1100 (HY000): Table 'LockTableDemo' was not locked with LOCK TABLESmysql> create table UserIformation   -> (   -> UserId int,   -> UserName varchar(10)   -> );ERROR 1100 (HY000): Table 'UserIformation' was not locked with LOCK TABLES

要解决此问题，您需要重新启动 MySQL。