SQLiteDatabase for beginners quiz answers

These are the answers for the Quizzes in the SQLiteDatabase for Beginners Lesson. Correct answers are marked in bold.

Quiz answers

Quiz 1: Available SQLite classes

Use this Quiz to check what you have learned. Some questions may have more than one right answer.

Question 1.1: SQLiteDatabase is available for all the supported platforms.

  • Yes.

  • No.

Question 1.2: What are the platforms supported by SQLiteDatabase?

  • Desktop, Web

  • Web, Console, Mobile (iOS & Android).

  • Desktop, Web, Mobile (iOS & Android)

  • Desktop, Console, Web

  • Desktop, Web, Mobile (iOS & Android), Console

Question 1.3: SQLite can be used only in single user mode.

  • No.

  • Yes.

Question 1.4: SQLite works in 32-bit mode even when the app is deployed as 64-bit.

  • True.

  • False.

Quiz 2: In-memory SQLite databases

Use this Quiz to check what you have learned. Some questions may have more than one right answer.

Question 2.1: A Xojo app only can use one in-memory database at once.

  • Yes.

  • No.

Question 2.2: Sort the following lines of code to create an in-memory database

  • dbsource = New SQLiteDatabase

  • If Not dbsource.Connect Then

  • MessageBox("Error Creating the Database")

  • Exit

  • End If

Question 2.3: We only can create in-memory databases that are going to use less than 2 GB of RAM

  • True.

  • False.

Question 2.4: Once a table has been created, we can…

  • Delete columns.

  • Modify some of the current columns.

  • Add new columns to the table.

Question 2.5: Once we create a SQLite database instance and assign it to a variable we can start using it.

  • Yes.

  • No.

  • Yes, always the variable or property is in scope during database use.

Question 2.6: We still can use a in-memory database the next time we run the app.

  • Yes, always it has valid data

  • No, the database is deleted once we exit the app.

Question 2.7: Once we create an SQLiteDatabase we just need to use the Connect method to start using it.

  • Yes.

  • No.

  • Yes, always the Connect method has returned True as result.

Quiz 3: tables

Use this Quiz to check what you have learned. Some questions may have more than one right answer.

Question 3.1: SQLite sets a maximum number of tables for a database.

  • No.

  • Yes.

Question 3.2: In order to create a table in Xojo we will use the SQLSelect method from the SQLiteDatabase or iOSSQLiteDatabase classes.

  • True.

  • False.

Question 3.3: After creating a Table using SQLExecute we will get the result of the operation as a Boolean value.

  • True.

  • False.

Question 3.4: Once a Table has been created, it is possible to modify the name of any of the defined columns

  • True.

  • False.

Question 3.5: Once a Table has been created, it is possible to deleted any of its columns.

  • True.

  • False.

Quiz 4: DatabaseRecord

Use this Quiz to check what you have learned. Notice that the questions may have more than one right answer.

Question 4.1: The name of the Class to add new records to the database is…

  • SQLiteRecord.

  • DatabaseField.

  • Record.

  • DatabaseRecord.

Question 4.2: We have to observe the correct use of lowercase and uppercase letters in the name when referring the database columns.

  • Yes.

  • No, it doesn't matter when using SQLite.

Question 4.3: The method name of the SQLiteDatabase and iOSSQLiteDatabase classes to add new records is…

  • AddRecord.

  • InsertField.

  • AddDatabaseRecord.

  • InsertRecord.

Question 4.4: We can add new records using a SQL statement executed with SQLSelect on the database instance.

  • True.

  • False.

Question 4.5: Sort the lines to add a record using the DatabaseRecord Class.

  • Var nr As New DatabaseRecord

  • nr.Column("nombre") = "Nombre " + n.ToString

  • dbsource.InsertRecord("prueba", nr)

Quiz 5: retrieving records

Use this Quiz to check what you have learned. Some questions may have more than one right answer.

Question 5.1: The name of the class we use to navigate and access the records from a database query is…

  • DatabaseRecord.

  • DataGroup.

  • Records.

  • RecordList.

  • RecordSet.

Question 5.2: We can iterate the records from a RecordSet as many times as we need.

  • Yes.

  • No.

  • Yes, always move the cursor pointer to the first record in first place.

Question 5.3: Once we get a RecordSet we can access to it from any point of our app.

  • Yes.

  • No.

  • It depends if the variable or property that references the RowSet is in scope.

Question 5.4: We just need to test the RecordSet for Nil in order to start using it

  • True.

  • Not always.

  • We also need to make sure that AfterLastRow is False, for example.

Question 5.5: RecordSet offers methods to Delete, Edit and Insert records among other operations.

  • Yes.

  • No.

  • Only Delete and Edit, among other actions.

Question 5.6: What are the method names we have to use to navigate the RecordSet?

  • MoveFirst, MoveNext, MovePrevious, MoveLast.

  • JumpFirst, Next, Rewind, JumpLast.

  • MoveFirst, Next, Previous, MoveLast.

  • MoveNext, MovePrevious

Question 5.7: The method we use to know the number of records in a RecordSet is…

  • RecordCount.

  • Records.

  • NumberOfRecords.

  • TotalRecords

Question 5.8: A RecordSet is closed when…

  • We call the Close method on the instance.

  • The instance gets out of Scope.

  • The App quits.

  • A RecordSet never closes, it's always available.

  • We get an Error.

Quiz 6: editing records

Use this Quiz to check what you have learned. Some questions may have more than one right answer

Question 6.1: What method should we use to access a column value from a record?

  • Value.

  • Record.

  • DataField.

  • Field.

Question 6.2: Can we directly access a column value using the Field method?

  • Yes, sure.

  • No, we have to query the database using SQLSelect.

  • No, we have to use a DataRecord instance.

  • No, we do it using a DatabaseField instance.

Question 6.3: What RecordSet method should we call before we can modify a record data?

  • Prepare.

  • Rollback.

  • DataEdit.

  • Edit.

Question 6.4: What's the main advantage of using SQLExecute instead of RecordSet when updating a record?

  • None, in fact it is preferable and easier to use RecordSet.

  • SQLExecute provides greater flexibility.

  • SQLExecute provides greater flexibility and returns a new RecordSet with the data already updated.

Quiz 7: file-based SQLite databases

Use this Quiz to check what you have learned. Some questions may have more than one right answer.

Question 7.1: Sort the lines of code to create a file based SQLite database

  • DBSourceDisk = New SQLiteDatabase.

  • Var file As FolderItem = SpecialFolder.Documents.Child("tet.sqlite")

  • If file <> Nil Then

  • DBSourceDisk.DatabaseFile = file.

  • Try

  • DBSourceDisk.CreateDatabase

  • Catch error As IOException

  • MessageBox("Error Creating the Database".)

  • End Ty

  • Else

  • MessageBox("Error Found while Creating the File")

  • End If

Question 7.2: What's the effect when calling the 'CreateDatabase' on a file that already has SQLite data on it?

  • It will delete the current contents, initializing again the file in order to be used by the SQLite database instance.

  • The app will raise an Exception.

  • The app will create a copy of the file, initializing it so it can be used by the SQLite database instance.

  • It will act as if the method 'Connect' was called.

Question 7.3: SQLite creates the database file encrypted by default.

  • True.

  • False.

  • It's true, but using a 128 bits length.

Question 7.4: What SQL statement we will use to delete all the records from a Table?

  • DELETE FROM table_name.

  • DELETE * FROM table_name.

  • DELETE all FROM table_name.

  • DELETE FROM table_name WHERE id = *.

  • DROP TABLE table_name.

Question 7.5: Can we change the file used by a SQLite database instance on the fly?

  • Yes.

  • No.

Quiz 8: backup

Use this Quiz to check what you have learned. Notice that the questions may have more than one right answer.

Question 8.1: We only can backup in-memory databases

  • Yes.

  • No.

Question 8.2: The backup is done over…

  • A valid FolderItem instance that is in scope during all the process.

  • Another in-memory or file based database.

  • Another file based and initialized SQLite database.

Question 8.3: What modes can we use to backup a SQLite database?

  • Synchronous and Asynchronous modes.

  • Synchronous, Direct and Muliuser modes.

  • Synchronous and Asynchronous modes.

Question 8.4: What measure of time should we use to set the period in a Synchronous backup?

  • Seconds.

  • Microseconds.

  • Milliseconds.

  • We have to pass -1 as the value for the parameter.

Question 8.5: Once the backup has finished, the SQLite database instance will use the file of the target database.

  • True.

  • False.

Quiz 9: asynchronous backup

Use this Quiz to check what you have learned. Some questions may have more than one right answer.

Question 9.1: Why is it preferable to use asynchronous backups instead of synchronous?

  • The app is not blocked.

  • It only works with big database files.

  • It provides more control, for example the ability to cancel the backup process.

  • We can receive information about the process progress and possible errors.

Question 9.2: What is the name of the Class Interface that we have to implement in the class used as backup handle?

  • SQLiteBackupInterface.

  • SQLiteBackupProgress.

  • SQLiteBackupInformation.

Question 9.3: Do we have to implement (add code) in all the methods added by the SQLiteBackupInterface?

  • Yes.

  • No.

Question 9.4: The object used as backup handle, has to be in scope during all the process?

  • Yes.

  • No.

  • Only if we had implement code on any of the Class Interface methods.

Question 9.5: It's mandatory to pass the time period parameter to the Backup method?

  • No.

  • Yes.

Quiz 10: ciphering SQLite databases

Use this Quiz to check what you have learned. Some questions may have more than one right answer.

Question 10.1: Xojo uses by default a ciphering length of 256 bits?

  • Yes.

  • No.

Question 10.2: What prefix string should we use in the password to enable the 256 bits ciphering length?

Question 10.3: What method should we use in order to encrypt an already existing SQLite database file?

  • Encrypt.

  • EncryptionKey.

  • CipherDB.

  • Encrypt("").

Question 10.4: How can we decrypt an already ciphered database once we are connected to it?

  • Encrypt("").

  • Decrypt.

  • Wipe.

  • EncryptionKey = "".