The package of DB

 Public classdb{ Public StaticConnection Getconn () {Connection conn=NULL; Try{class.forname ("Com.mysql.jdbc.Driver"); Conn=Drivermanager.getconnection ("Jdbc:mysql://localhost:3306/bbs","Root","Root"); }        Catch(Exception e) {e.printstacktrace (); }        returnConn; }         Public StaticStatement getstatement (Connection conn) {Statement stmt=NULL; Try{stmt=conn.createstatement (); }        Catch(SQLException e) {e.printstacktrace (); }        returnstmt; }         Public StaticResultSet executeQuery (Statement stmt,string sql) {ResultSet rs=NULL; Try{RS=stmt.executequery (SQL); }        Catch(SQLException e) {e.printstacktrace (); }        returnrs; }         Public Static voidClose (Connection conn) {if(Conn! =NULL)            Try{conn.close (); }            Catch(SQLException e) {e.printstacktrace (); }    }         Public Static voidClose (Statement stmt) {if(stmt! =NULL)            Try{stmt.close (); }            Catch(SQLException e) {e.printstacktrace (); }    }         Public Static voidClose (ResultSet rs) {if(rs! =NULL)            Try{rs.close (); }            Catch(SQLException e) {e.printstacktrace (); }    }}

The package of DB