android怎么连接sqlite数据库？

SQLite数据库首先先建立SQLiteOpenHelper()的子类实现SQLiteOpenHelper中的OnCreate()方法和构造方法。 this class takes care of opening the database if it exists, creating it if it does not, and upgrading it as necessary.

SQLiteOpenHelper()主要是提供数据库的对象，其中的getWriteableDatabase

public class PersonSQLiteOpenHelper extends SQLiteOpenHelper{public PersonSQLiteOpenHelper(Context context){super(context, "person.db", null, 1);}

/** * 第一次被创建的时候调用的方法 */@Overridepublic void onCreate(SQLiteDatabase db){db.execSQL("create table person(id primary key autoincrement,name varchar(20),number varchar(20)");}

@Overridepublic void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2){

}

}

有了SQLiteOpenHelper的子类后，就可建立其引用hrelper,用引用获得数据库db=helper.getWritableDataBase();Db.execSQL(“select * from table”);建立与数据库操作相关的类（选择）public class PersonDao{private PersonSQLiteOpenHelper helper;

public PersonDao(Context context){helper = new PersonSQLiteOpenHelper(context);}/** *   * @param name * @param number */public void add(String name, String number){SQLiteDatabase db = helper.getWritableDatabase();db.execSQL("insert into person(name,number) values(?,?)", new Object[] {name, number });db.close();}

/** *  * @param name * @return */public boolean find(String name){SQLiteDatabase db = helper.getReadableDatabase();Cursor cursor = db.rawQuery("select *from person where name=?",new String[] { name });boolean result = cursor.moveToNext();cursor.close();db.close();return result;}

/** *  * @param name * @param number */public void update(String name, String number){SQLiteDatabase db = helper.getWritableDatabase();db.execSQL("update person set number=? where name=?", new Object[] {number, name });db.close();}

/** *  * @param name */public void delete(String name){SQLiteDatabase db = helper.getWritableDatabase();db.execSQL("delete from person where name=?", new Object[] { name });db.close();}/** *  * @return */public List<Person> findAll(){SQLiteDatabase db = helper.getReadableDatabase();Cursor cursor = db.rawQuery("select *from person", null);ArrayList<Person> list = new ArrayList<Person>();while (cursor.moveToNext()){int id = cursor.getInt(cursor.getColumnIndex("id"));String name = cursor.getString(cursor.getColumnIndex("name"));String number = cursor.getString(cursor.getColumnIndex("number"));Person person = new Person(id, name, number);list.add(person);}return list;}}

事物//开启事物db.beginTransaction();try{//标记事物执行成功db.setTransactionSuccessful();} finally{db.endTransaction();}