1 public class MainActivity extends Activity {
 2 
 3     @Override
 4     protected void onCreate(Bundle savedInstanceState) {
 5         super.onCreate(savedInstanceState);
 6         setContentView(R.layout.activity_main);
 7 
 8         //每个程序都有自己的数据库 默认情况下是各自互不干扰
 9         //1.创建一个数据库并且打开
10 SQLiteDatabase db=openOrCreateDatabase("user.db",MODE_PRIVATE,null);
11 db.execSQL("create table if not exists usertb(_id integer primary key autoincrement," +
12             "name text not null,age integer not null,sex text not null)");    
13         //创建用户表 包括 _id主键，姓名，年龄，性别
14 db.execSQL("insert into usertb(name,age,sex)values(‘张三‘,‘男‘,26)");
15 db.execSQL("insert into usertb(name,age,sex)values(‘刘明‘,‘男‘,22)");
16 db.execSQL("insert into usertb(name,age,sex)values(‘于思‘,‘女‘,21)");
17 
18 //2.使用游标cursor相当于存储结果的集合，可理解为list
19   Cursor c=db.rawQuery("select*from usertb",null);
20   if(c!=null){
21       while(c.moveToNext()){
22           Log.i("info","_id:"+c.getInt(c.getColumnIndex("_id")));
23           Log.i("info","name:"+c.getString(c.getColumnIndex("name")));
24           Log.i("info","sex:"+c.getString(c.getColumnIndex("sex")));
25           Log.i("info","age:"+c.getInt(c.getColumnIndex("age")));
26           Log.i("info","!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
27       }
28       c.close();//3.释放游标
29   }
30   db.close();
31     }
32 }