Android学习笔记_SQLite的使用

SQLite使用方法

public class DatabaseHelper extends SQLiteOpenHelper{
    private static final int VERSION=1;
    public DatabaseHelper(Context context,String name,CursorFactory factory,int version){
        super(context,name,factory,version);
    }
    public DatabaseHelper(Context context,String name){
        this(context,name,VERSION);
    }
    public DatabaseHelper(Context context,String name,int version){
        this(context,name,null,version);
    }
    public  void onCreate(SQLiteDatabase db){
        db.execSQL("create table user(id int,name varchar(20))");
        System.out.println("create a Database");
    }
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion){
        System.out.println("update a Database");
    }
}

public class SQLiteActivity extends Activity{
    class UpdateListener implements OnClickListener{
        public void onClick(View v){
           DatabaseHelper dbHelper = new DatabaseHelper(SQLiteActivity.this,"test_mars_db",2);
           SQLiteDatabase db= dbHelper.getReadableDatabase();
        }
    }
   
    class InsertListener implements OnClickListener{
         public void onClick(View v){
             ContentValues values=new ContentValues();
             values.put("id",1);
             values.put("name","zhangsan");
             DatabaseHelper dbHelper=new DatabaseHelper(SQLiteActivity.this,"test_mars_db");
             SQLiteDatabase db= dbHelper.getWriteableDatabase();
             db.insert("user",null,values);
         }
    }

    class UpdateRecordListener implements OnClickListener{
         public void onClick(View v){
             DatabaseHelper dbHelper = new DatabaseHelper(SQLiteActivity.this,"test_mars_db");         
             SQLiteDatabase db = dbHelper.getWriteableDatabase();
             ContentValues values = new ContentValus();
             values.put("name","zhangsanfeng");
             db.update("user",values,"id=?",new String[]{"1"});
         }
    } 
   
    class QueryListener implements OnClickListener{
          public void onClick(){
             DatabaseHelper dbHelper=new DatabaseHelper(SQLiteActivity.this,"test_mars_db");
             SQLiteDatabase db= dbHelper.getWriteableDatabase();
             Cursor cursor = db.query("user",new String[]{"id","name"},"id=?");
             while(cursor.moveToNext()){
                 String name=cursor.getString(cursor.getColumnIndex("name"));
                 System.out.println("query----->"+name);
             }
         } 
    }
}