Some problems with writing Java code

Record some of the problems that are encountered when writing a paper experiment.

Database SQL statement aspects:

1.java connect MySQL database method via JDBC

See also: http://hzy3774.iteye.com/blog/1689525

2. Error Java.sql.SQLException:Can not issue data manipulation statements with executeQuery ().

Note that if the SQL statement is a query, use ExecuteQuery () to make modifications to the table using Executeupdate ()

Java Statement aspects:

1. Definition of vectors. Vector initialization cannot use vector<string> Orimid =null, which causes null pointer errors when elements are added like this vector. Correct method:vector<string> Orimid =new vector<string> ();

Some problems with writing Java code