1、错误描述
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxError Exception：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 ‘notnull,user_name varchar(255) )’ at line 1
2、错误原因
StringBuilder sql = new StringBuilder();sql.append("create table t_you_su_ta(");sql.append(" id int primary key,");sql.append(" user_id int notnull,");sql.append(" user_name varchar(255))");在拼接创建数据库表时，要使user_id不为空，定义成了“notnull”
3、解决办法
在拼接user_id时，，应改成“user_id int not null”
始终调整好自己观风景的心态，
