Question

我已经阅读了很多关于在android中使用标准SQLiteDatabase的内容，似乎最好的办法是保留一个SQLiteOpenHelper实例，永远不要关闭返回的SQLiteDatabase对象，也不要关闭SQLiteOpenHelper。问题是这些指南在使用SQCipher加密库时是否有效？似乎SiteCipher包中的SQLiteOpenHelper的close（）方法不是空的，并且确实发布了一些东西。从不称这种方法是否安全？

以下是Github（http://goo.gl/u4L0C）的SQLiteDatabase.close（）方法的实际代码：

public void close() {

    if (!isOpen()) {
        return; // already closed
    }
    lock();
    try {
        closeClosable();
        // close this database instance - regardless of its reference count value
        onAllReferencesReleased();
    } finally {
        unlock();
    }
}

private void closeClosable() {
    /* deallocate all compiled sql statement objects from mCompiledQueries cache.
     * this should be done before de-referencing all {@link SQLiteClosable} objects
     * from this database object because calling
     * {@link SQLiteClosable#onAllReferencesReleasedFromContainer()} could cause the database
     * to be closed. sqlite doesn't let a database close if there are
     * any unfinalized statements - such as the compiled-sql objects in mCompiledQueries.
     */
    deallocCachedSqlStatements();

    Iterator<Map.Entry<SQLiteClosable, Object>> iter = mPrograms.entrySet().iterator();
    while (iter.hasNext()) {
        Map.Entry<SQLiteClosable, Object> entry = iter.next();
        SQLiteClosable program = entry.getKey();
        if (program != null) {
            program.onAllReferencesReleasedFromContainer();
        }
    }
}

Android SQLCipher我需要关闭数据库吗？

0 个答案: