To get information from different tables they need to be joined via key fields which are unique identifiers. To get information, queries are run that extracts information depending on certain criteria. The database has the following tables:Įmployee – contains the details of all employees in the company Factory – contains the details of the factory sites the company has Grade-scales – contains the grade scales that an employee can have Skills – contains skill sets an employee has. To give an example of how tables work, imagine an employee database containing details of a companies employees. All this information could be put into one table but it would be very large and slow to extract. data item 'a' can have data item 'c', data item 'd' and data item 'e'). This is different from an item of data having a one to many relationship with many items of data (i.e. data item 'a' can only have only a data item 'b'). One item of data can have a one to one relationship with another item of data (i.e. The reason for this is dependent on the relationship of some data to another. They are also used so that they data is stored more efficiently. Tables are ways of storing data in which they are easily organised to find. With sqlite and any other database software, once a database is created, it is populated with tables.
As it works, can it be defined as a bug or a nice to have feature? I imagine this is behaving correctly or else it would be better if the exception was caught and a sqlite.ERROR was produced (nothing is returned when an exception is thrown). With the examples I have used, the sqlite.OK has already been returned except for a Sqlite exception thrown when for example an incorrect sql command was entered in db.exec or to create a table that already exists. In the below example, the function is used to see if it equals either the sqlite.OK or sqlite.ERROR enums and displays the appropriate object. The status of this action is checked by using the db.status function. For example to check the status of opening a database which was done in the last section, enter the following commands: To check the status after an operation has occurred, Sqlite enums can be used. Var db = new sqlite.Database("music_collection.db") Once this is done, a sqlite.Database object called db. The following command opens the sqlite database music_collection.db. I thought I'd expand it a bit with a few more examples.Īs always, the sqlite module needs to be imported.
#Sqlite command line based manual#
The page on the SQLite in the Seed Reference Manual is pretty much all you need to do for this module:
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