（4-4）对数据库student中的学生基本信息表stdinfo进行查询操作。importjava.sql.*;publicclassStudentDB{staticConnectionconn;staticStatementsql;staticResultSetrs;publicConnectiongetConnection(){try{Class.forName("org.gjt.mm.mysql.Driver");conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/student","12345","sa");}catch(Exceptione){e.printStackTrace();}returnconn;}publicstaticvoidmain(String[]args){StudentDBstdTemp=newStudentDB();conn=________________________//与数据库建立连接try{sql=______________________________//实例化Statement对象rs=___________________________//查询stdinfo表while(_______________){//取得rs结果集的所有行//获取列名是"name"的字段值Stringname=_____________________//获取列名是"sex"的字段值Stringsex=____________________System.out.print("姓名:"+name);System.out.print("性别:"+sex);}}catch(Exceptione){e.printStackTrace();}}}