JDBC MySQL fetch number, suddenly no data, the database has data

Project with the Jdbc+mysql, the Bureau network to take data, data all normal, but to the server, once was good

Do not know why, the recent pass on the data, found that Android is not a problem, at least, there is no grammatical problems.

After tracing found that SQL is no problem, put directly into MySQL to execute the data.

But strange, and later found that there is no condition in the back of the time, passed into the 1=1

Then I can not get it out, I put the where 1=1 removed, or where field = ' xxxx ' so there is data.

I don't know why, but the problem is solved.

JDBC MySQL fetch number, suddenly no data, the database has data