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Updated 006 Basic Fields (markdown)

Amigo 2019-05-22 13:17:09 +02:00
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006-Basic-Fields.md

@ -6,6 +6,8 @@ In this tutorial we will look at creating fields. There are two groups. Easy, pl
First we'll look at the more common field types. Not all of them, of course. I'm just going illustrate to you a text field type and a list field type. [00:00:54](https://www.youtube.com/watch?v=9NO2rKnC6Ug&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h00m54s) All the other sort of fields follow the same kind of implementation.
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So let's create a new field type. We would select text as our first illustration. It will automatically load the fields here set on the field types default settings we looked at previously. When it comes to this information here you need to have a good background on MySQL to understand what a varchar, a text, a medium text, a long text, and so on, exactly means. [00:01:29](https://www.youtube.com/watch?v=9NO2rKnC6Ug&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h01m29s) These are basically the data types in relation to the database. I have now added the feature of you being able to change that because I want to liberate your ability to develop applications that are more advanced than a cookie cutter kind of component builder. [00:02:04](https://www.youtube.com/watch?v=9NO2rKnC6Ug&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h02m04s) This component builder wants to leave enough room for you to make very advanced choices. So the more I constrain it to a sort of "just click here, there; don't know any code, just go on and build something," the more I am going to frustrate the real developer who wants to design something more advanced and versatile. [00:02:25](https://www.youtube.com/watch?v=9NO2rKnC6Ug&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h02m25s) There are component builders out there that probably have done that, but I want to give you enough tools to be creative which means a little bit more complexity all over. But if you know PHP and have worked with PHP in relation to SQL or any other SQL database connections via Java or any other language, you will know that there is such a thing as a data type.[00:02:59](https://www.youtube.com/watch?v=9NO2rKnC6Ug&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h02m59s) You will know that it has a length, that you can set some default value to it, and that you can decide whether it's a key or a unique key. Just realize that if you set it as a unique key (as an Index type) it means that specific field will only allow a value once and if that same value is placed in it, it will be an error. [00:03:38](https://www.youtube.com/watch?v=9NO2rKnC6Ug&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h03m38s) You hardly ever use that. You won't even use it for an alias because the alias implementation in Joomla deals with the duplication within the model when it saves the information. It actually checks whether there is an alias in the database and implements the alias so that it doesn't conflict. So even there you do not need that feature. But it is available and you might see a need to use it, so I added it there.
Then your normal null switch. (Whether the table should be null if it's empty.) [00:04:15](https://www.youtube.com/watch?v=9NO2rKnC6Ug&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h04m15s) Usually you would use one of these default values and then set it to "not null."