常见的JDBC错误

1 ClassNotFoundException: 驱动类未找到

2 No suitable driver found for //localhost:3306/mydb?user=root&password=123456&serverTimezone=PRC：URL错误

3 Access denied for user 'root1'@'localhost'(using password:YES)：账号或密码错误

4 You have an error in your SQL syntax;

   check the manual that corresponds to your MySQL server version for the right syntax to use near 'deletea from uesrs where uid = 6 '...   ：sql语句错误

5 Duplicate entry '5' for key 'PRIMARY'  ：主键约束冲突