SSM整合,MySQLIntegrityConstraintViolationException: Column 'xxx' cannot be null
1.查询对象com.pojo.Books中参数是否get,set,toSring和有参数、无参数构造器的配置。2.检查mybatis层BookMapper.xml的sql语句。3.检查spring-service.xml中sqlSessionFactory工厂类和配置dao接口扫描包。4.检查spring-service.xml的所有业务类,注入Spring是否成功。声明事务配置transacti