小编Sar*_*nan的帖子

我有下表:

CREATE TABLE studenttest 
(
    YEAR INT,
    DEPT VARCHAR(5),
    SEM INT,
    REGNO INT,
    NAME VARCHAR(20),
    ENGLISH VARCHAR(2),
    MATHS VARCHAR(2),
    PHYSICS VARCHAR(2),
    CHEMISTRY VARCHAR(2),
    EG VARCHAR(2),
    FOC VARCHAR(2),
    LAB1 VARCHAR(2),
    LAB2 VARCHAR(2),
    LAB3 VARCHAR(2)
)

有以下数据:

INSERT INTO studenttest 
 values
 (2010,'cse',3,1,'saravaanan','a','b','c','d','ra','f','g','h','i'),   
 (2010,'cse',3,2,'raja','ra','b','c','d','e','f','g','h','i'),
 (2010,'cse',3,3,'selvam','a','b','c','d','e','f','g','h','i')

我想查询这些数据,以获得所有在任何科目中没有 "ra"等级的学生的结果集.

是否有可能启动一个Activty使用Intent在通用java类extends Activity？

 import android.os.Bundle;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.Spinner;
 import android.app.Activity;
 import android.content.Intent;

 public class SubActivity extends Activity{

          protected void onCreate(Bundle savedInstanceState) {
                 super.onCreate(savedInstanceState);
                 setContentView(R.layout.activity_main);
           }           
 }

和一般的java类如下

class TestClass extends Activity{

       void firstsem(){
        Intent t = new Intent(this, SubActivity.class);
        t.putExtra("sub1","chemistry");                 
        startActivity(t);
   }
}

是否可以从一般的java类启动一个Activity？有人能告诉我如何实现这个目标吗？

这是打印所有主题名称的程序,它是student table.i的字段名称.将所有主题名称存储到一个数组中,我必须在另一个页面中打印该数组值.所以我将该数组存储到会话变量中但是在下一页打印该数组时,它只打印为"数组".

<?php

session_start();
$con=mysql_connect("localhost","root","");  
mysql_select_db("cse",$con);

$sql="select * from studenttable where username='saravanan'";

$calname=array();
$i=0;
mysql_query($sql);
while($rs=mysql_fetch_field($result))
{
         $colname[$i]=$rs->name;
         $i++;


}
$_SESSION['subject']=$calname;
?>


in the next page i print the session variable using 


<?php
session_start();
echo $_SESSION['subject'];
?>

but i am getting "Array"only as output.
how to print the all value of array what i stored into it already?

我从android官方网站下载了sdk,并使用android sdk manager安装了最新的构建工具.我在这里设置了android home

但是当我跑步时cordova build android我得到了ANDROID_HOME is not your path.

然后我和这里一样,但没有运气.

请帮我解决这个问题.