With this approach, the system works just fine – but just fine is not enough for you.
Dbschema magento 2 install#
This leads to complex and lengthy code, which slows down the performance.īut everything is not so bad with the install and upgrade scripts. You cannot remove old sections before adding new ones for the new versions. So an error can easily occur if an extension tries to reference the table from a different database. There is no 100% chance that all relations between tables exist or that the table was not modified by an extension. The reason for that is the table with initially incorrect structure. It often happens that, due to incorrect installation, the final structure is not the same as the base definition. One of the most common mistakes that many developers make is putting changes in the installation script instead of creating a new one.
The presence of different script types in the system leads to it being unstable and complex. As a result, certain disadvantages appear that affect the performance of the system: While for installation, all scripts are executed in a loop (in the order of module registration), in case of the upgrade only those scripts that match the upgrading module version are executed. In this case, Magento has to go through all the versions and execute all the set commands, including the mutually exclusive ones. Version 1.0.1 could feature “add column” and version 1.0.2 would have “remove column”. Such an approach caused a whole lot of mundane and useless work. So upon installation, Magento would go through all the module versions and through all the updates till the final version is reached. The latest module version normally contains all the changes and updates in the module code.
Dbschema magento 2 update#
Install and Update Scripts: How It Always Used to Beīefore the declarative schema release, Magento developers had to write the database scripts in PHP for every new module version. In 2018, Magento introduced a new declarative schema feature that aims at eliminating excessive work and speeding up the installation and upgrade processes.īefore losing your head over this innovation, let’s first have a closer look at it and see whether its pros outweigh its cons.
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