Answers CHAPTER 16 617
Answers
This section contains the answers to the lesson review questions in this chapter.Lesson 1
- Correct answer: A
A. Correct: Because iOS web applications can target Safari’s mobile browser specifi-
cally, you can be sure that Web SQL will be available.
B. Incorrect: Not all mobile browsers support Web SQL and therefore should be
avoided.
C. Incorrect: Not all desktop browsers support Web SQL and therefore should be
avoided.
D. Incorrect: Internet Explorer does not support Web SQL. - Correct answer: D
A. Incorrect: A createDatabase() command does not exist in Web SQL.
B. Incorrect: A new database cannot be created by instantiating an instance of the
Database class.
C. Incorrect: An initDatabase() command does not exist in Web SQL.
D. Correct: The openDatabase() command is used for both new and existing
databases. - Correct answer: A
A. Correct: The question mark is used as a placeholder for SQL arguments being
passed in.
B. Incorrect: No syntax is available for accessing arguments by a zero-based index.
C. Incorrect: No syntax is available for accessing arguments by a one-based index.
D. Incorrect: This form of placeholder is commonly used for string.Format() method
calls in C# but is not valid for Web SQL.
Lesson 2
- Correct answer: D
A. Incorrect: Transactions are supported by IndexedDB.
B. Incorrect: Cursors are supported by IndexedDB.
C. Incorrect: Indexes are supported by IndexedDB.
D. Correct: The SQL syntax is not supported by IndexedDB.