SQLiteOpenHelper自动建立数据库

 private static class DatabaseHelper extends SQLiteOpenHelper{ private static final String DATABASE_CREATE="create table mytable"+ "(id integer primary key autoincrement,"+ "name text not null,"+ "address text not null,"+ "createtime text not null);";DatabaseHelper(Context context) {super(context, DATABASE_NAME, null, DATABASE_VERSION);// TODO Auto-generated constructor stub}@Overridepublic void onCreate(SQLiteDatabase db) {// TODO Auto-generated method stubdb.execSQL(DATABASE_CREATE);}@Overridepublic void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {// TODO Auto-generated method stubdb.execSQL("DROP TABLE IF EXISTS mytable");onCreate(db);}}

 

外部调用SQLiteOpenHelper.getWritableDatabase()方法时,如果没有可打开的数据库,

程序将自动调用重写的SQLiteOpenHelper.onCreate(SQLiteDatabase db)方法,来新建

一个数据库