As a web developer, one thing that helps me to rapidly develop web applications is to use a common application framework that is flexible and robust. Additionally, I like to use code generators to build code for custom applications I build for my client. My most powerful code generators, create code for interacting with the local database dedicated to my website.
Normally, it is bad practice to repeat code when doing development. However, there are certain instances when this can be beneficial and assist in creating dynamic web applications สร้าง qr code. Here, we will discuss some of the many applications that I have found useful and how you can apply them to your own business.
One way I enforce code reuse is by using object-oriented design. For my data access layer I create an abstract class which contains the common functionality. Next, I create derived classes which implement the specific methods which are needed for the entity model (usually a database table).
These derived classes have different fields which represent the fields defined for the table. They also contain mappings for the primary keys, any related fields that are retrieved from related tables, and custom methods for querying the database. The idea is that all of the database calls are encapsulated in the data access layer classes.
These derived classes have enough similarities between one another that it made sense for us to build a code generator to create these files from the database schema.
How to Generate Code in Your Intranet
On our intranet, we have the code generated connected directly to our database management scripts. When an administrator is viewing a table schema, they have a button on the bottom of the screen to generate the code for our data access layer. When the user presses this button, the code is immediately generated and the user can click anywhere on the code to select the code block and copy it to the clipboard.
The process of generating code is surprisingly simple. We simply retrieve the schema from the database and from that we define all the macros that are needed to substitute into a code template. These macros include things such as the script name, database table name, primary key fields, public fields, private fields, and a generated class name.
The code is output to the screen as pre-formatted text. Below this is a web form where the user may tweak any of the macro values that were generated. After making changes to these values, they can click a submit button which regenerates the code using the custom macro values. Of course this step is optional. The user may simply choose to copy all of the program code and paste it in their code editor and continue making changes that way.