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我想關閉數據庫,但它給我錯誤。關閉Sqlite android
private SQLiteDatabase sq;
//cardDatabase name of my class.
public void close_DB(){
CardDatabase data_open=new CardDatabase(MyContext);
sq.close();
data_open.close_DB();
}
九月3日至2日:13:03.841:d /顯示java.lang.NullPointerException(2447): 顯示java.lang.NullPointerException九月3日至2日:13:03.841: d/java.lang中.NullPointerException(2447):java.lang.NullPointerException 03-02 09:13:03.841:D/java.lang.NullPointerException(2447):at com.livecards.beta.CardDatabase.close_DB(CardDatabase.java:52)