Stepping on the pit-MyBatis/MyBatis-Plus

1. Problem: MybatisPlus paging query clearly sets the number of queries per page to 10,000, but still only finds out 500 pieces of data Reason
    : The PaginationInterceptor of the lower version of MyBatis-Plus defines a default limit of 500, which is set when the size exceeds the limit The value scheme where size is limit
    : modify the limit attribute paginationInterceptor.setLimit(10000) in the configuration class PaginationInterceptor;
    Question: According to the Internet, if the limit value is -1, the memory will exceed the limit due to the large amount of query data, but there are also People are set to -1
2. Problem: In MyBatis/MyBatis-Plus, when the value of the integer type field is 0, the if test condition fails
    Reason: In the source code of MyBatis, when judging the value of the integer type, the value of 0 will be processed by default as Empty string'' 
    solution: only judge non-null