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Today I wrote the MySQL database connection, initially connection always reported null pointers, and then found no Class.forName ("Com.mysql.jdbc.Driver").Then appeared in the text paragraph is always question mark problem, checked the elder brother Niang all not to be possible.After that, add the character encoding to the URL and then connect to MySQL! As follows:String url= "Jdbc:mysql://localhost:3306/xxxxx? characterencoding=utf-8";Add the red part, is actually a small problem, easy to carel

Label:Check the Select Userenv (' language ') from dual first, view the Oracle character set,$ sqlplus/nologSql> Connect sys/oracle as SysdbaSql> StartupHow to set the encoding for an Oracle database (ZHS16GBK) modified to UTF8sql> shutdown immediate;sql> startup Mount;Sql> alter system enable restricted session;Sql> alter system set job_queue_processes=0;sql> ALTER DATABASE open;Sql> ALTER DATABASE character set Internal_use UTF8;sql> shutdown immediate;Sql> startup;