更新数据库时出错：超出锁定等待超时

Question

我使用了MyBatis，我想更新数据库中的数据，插入查询可以正常工作，但我在更新时出现了这个错误。

Error updating database. Cause: java.sql.SQLException: Lock wait timeout exceeded; try restarting transaction 

SqlMapConfig.xml

<?xml version="1.0" encoding="UTF-8"?> 
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> 
<configuration> 
    <environments default="development"> 
     <environment id="development"> 
      <transactionManager type="JDBC"/> 
      <dataSource type="POOLED"> 
       <property name="driver" value="com.mysql.jdbc.Driver"/> 
       <property name="url" value="jdbc:mysql://localhost/test"/> 
       <property name="username" value="root"/> 
       <property name="password" value="***"/> 
      </dataSource> 
     </environment> 
    </environments> 
    <mappers> 
     <mapper resource="config/UserMapper.xml"/> 
    </mappers> 
</configuration> 

UserMapper.xml

<?xml version="1.0" encoding="UTF-8"?> 
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> 
<mapper namespace="dao.UserDao"> 
    <update id="update" parameterType="User"> 
     update user set adress_u = #{adress_u} where id_u = #{id_u} 
    </update> 
</mapper> 

Test.java

String adress_u = (String) request.getAttribute("adress_u"); 
int id_u = (Integer) request.getAttribute("id_u"); 

SqlSession session = MyBatisSqlSessionFactory.getSession(); 
User u = new User(); 
u.setId_u(id_u); 
u.setAdress_u(adress_u); 

session.update("dao.UserDao.update", u); 
session.commit(); 
session.close(); 

感谢。

Answer 1

你应该考虑通过设置innodb_lock_wait_timeout增加了InnoDB的锁等待超时值，默认为50秒

mysql> show variables like 'innodb_lock_wait_timeout'; 

你可以将其设置为较高的值，然后重新启动mysql的：

SET GLOBAL innodb_lock_wait_timeout = 120;