mysql中datetime类型字段为默认值0000-00-00 00:00:00怎么取出来

Answer 1

今天遇到了这个问题，rs.getString（4）是datetime类型，而且是默认值报错：然后网上搜素了一下解决方案如下：原来是jdbc连接的问题改成这样jdbc:mysql://localhost:3306/brilliant?user=conglin&password=conglin&useUnicode=true&characterEncoding=gbk&zeroDateTimeBehavior=convertToNullreliably in Java.Connector/J 3.0.x always converted them to NULL when being read from a ResultSet.当这些值正在从ResultSet容器中读取时候，Connector/J 3.0.x 一直把他们转换为NULL值。Connector/J 3.1 throws an exception by default when these values are encountered as this is the most correct behavior according to the JDBC and SQL standards.依照JDBC和SQL的标准这些值碰到的最正确的处理方式就是在缺省情况下产生异常This behavior can be modified using the zeroDateTimeBehavior configuration property. The allowable values are:JDBC允许用下列的值对zeroDateTimeBehavior 属性来设置这些处理方式，exception (the default), which throws an SQLException with an SQLState of S1009.设置为exception 异常（缺省）用一个SQLState的s1009错误号来抛出一个异常convertToNull, which returns NULL instead of the date.设置为convertToNull，用NULL值来代替这个日期类型

Answer 2

当你插入一条数据时，如果不填这个字段的值，该列自己会填写默认值。数据库存储的是数据，你应该取出来的是数据，而不是类型吧