Question

http://developer.android.com/vis/android/database/sqlite/SQLiteOpenHelper.html#getWritableDatabase%28%29”rel=“nofollow” http://developer.android.com/vis/android/database/sqlite/SQLiteOpenHelper.html#getWritableDatabase%28%29。

Once opened successfully, the database is cached, so you can call this method every time you need to write to the database.

考虑如下文 the:

SQLiteDatabase db1 = openHelperImplObj.getWritableDatabase();
// do something with db1
SQLiteDatabase db2 = openHelperImplObj.getWritableDatabase();
// do something with db2
db2.close();
// do something with db1
db1.close();

我先谈一下获取可检索数据库的第二次呼吁:将退回同一附则的行文(db1),该呼吁是否将分线db2.close()引起任何问题,以取代后来出现的1项行动? 如果是的话,建议如何避免这一问题,因为第二次呼吁可能发生在任何地方,即不同职能,甚至不同类别。

Answer 1

When you open a data base by using db openHelperImplObj.getWritableDatabase(); then following thing check

<代码>1> 如果数据库没有建立,则建立数据库,并开放数据库,以备首次启用。

2>Second and most important what i have observed if data base is already created then it opened it but if its open already it do nothing, That means it occupy the old instance of data base that open DB already until you close it.Thats why its better practice to close DB once it use over

希望

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