I initially followed the Zend Framework 2 Album Tutorial Application to learn how to use TableGateway pattern to use database as the data source of my model. Basically I create the model mapper class injecting TableGateway object and interact with the database in the mapper as the business logic requires - so far displaying all book records by using fetchAll method.
Previously created BookMapper is an InvokableFactory without dependencies. I will now modify it to be a factory closure to inject TableGateway into it. This exception simply says that there is an interface that I used in my code but it has not been implemented correctly. If I take a closer look at the factory closure, it is trying to get AdapterInterface which is supposed to create the database adapter.
I did nothing fancy about it but simply added into the closure. However, it requires certain configuration key called db consist of driver type and connection properties to be included in the service manager. I am going to do that in the global. This time it complains about BookMapper instantiation, specifally a required but missing method. Using eager loading means that somewhere in the dog mapper the breed table is used.
Yeah, you could. I mean you could have a mapper named Book and have it manage several models. It depends on the situation really. In all this you just need to remember that the goal is make the controller and view stupid. Stupid in the sense both need to know very little about the data model to carry out their own goals.
Generally the less arguments a mapper method accepts the more specific the domain is and in-turn the more stupid controllers and views can be. The down-side of making a domain to specific is repeating similar code.
However, the downside of having some type of generic findAll method that accepts a bunch of parameters is that the smarter views and controllers need to be. Thanks a lot for the clarifications!! I will try this gateway approach, and, in order to deal with cross database table data, I will create those mappers. Database administrators need to be able to find SQL easily so they can figure out how to tune and evolve the database. A Zend gateway can look like this:. I must well organize my code, but I also must allow myself or one sql guru to work on the application - the last seems to be impossible if we opt for such architecture.
Table Data Gateway Objects — Those are object copies of our tables and they should contain table related generic queries. What will those gateway objects do? They will connect via an adapter to our data source ex: a MySQL database , on a generic non-database-specific way;. Data Mappers Objects - Those objects will work between our data source and our domain object models.
They may, or may not, use the Gateway to have access to the data source. On this Zend example, we will use the mapper to move data back and forward between Domain Objects and Gateway Objects;. Domain Objects a. Each action has a related URL which will result in that action being dispatched. The four actions and URLs are:. As noted earlier, the configuration file, module. The checklist route is defined like this:. To fix this, we will rename the route from checklist to task because this route will be solely for the Task controller.
We will then redefine it to be a single Segment type route that can handle actions as well as just route to the index action. We have now renamed the route to task and have set it up as a Segment route with two optional parameters in the URL: action and id. The optional constraints section allow us to specify regular expression patterns that match the characters that we expect for a given parameter. For this route, we have specified that the action parameter must be either add, edit or delete and that the id parameter must only contain numbers.
The routing for our Checklist module is now set up, so we can now turn our attention to the controller. Note that this is merely a convention. Your controller should now look like this:. This controller now contains the action for the home page which will display our list of to-do items.
We now need to create a model-layer that can retrieve the tasks from the database for display. It is time to look at the model section of our application. There are many components that you can use for this depending on your needs. One approach is to have model classes represent each entity in your application and then use mapper objects that load and save entities to the database.
In a larger, more complex, application, you would probably also have a service class that interfaces between the controller and the mapper. An entity object is a simple PHP object that represents a thing in the application. In our case, it represents a task to be completed, so we will call it TaskEntity. The Task entity is a simple PHP class with four properties with getter and setter methods for each property.
We also have a constructor to fill in the created property. We now need a mapper class which is responsible for persisting task entities to the database and populating them with new data.
Update it so that it looks like this:. Within this mapper class we have implemented the fetchAll method and a constructor. We are going to use this object for all of our interaction with the database, so we create it in the constructor. The fetchAll method retrieves data from the database and places it into a HydratingResultSet which is able to return populated TaskEntity objects when iterating.
To do this, we have three distinct things happening. Firstly we retrieve a Select object from the Sql object and use the order method to place completed items last. We then create a Statement object and execute it to retrieve the data from the database. To get this, we create a HydratingResultSet which requires a hydrator and an entity prototype to work.
The hydrator is an object that knows how to populate an entity.
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