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Upgrading Data Schemas
Official Documentation
Upgrading Data Schemas When you upgrade Liferay, you might run into incompatibility issues with your custom modules' data schemas. There are three ways you can resolve these issues: You can run...
Modifying Database Fields in Development
Official Documentation
Modifying Database Fields in Development As you develop an application, you might need to add fields to your database. This is a normal process of iterative development: you get an idea for a new...
Service Builder Basics
Official Documentation
Service Builder Basics Using Service Builder helps you learn it. You'll use it to learn the basics: Generating Model, Persistence, and Service Code: Define a basic model, generate code from it,...
Defining Entity Relationships
Official Documentation
Defining Entity Relationships Relationships between database entities or Java objects are necessary for most applications. Take Liferay's Message Boards application as an example. Each Message...
Sorting Entity Instances
Official Documentation
Sorting Entity Instances Often, you want to retrieve multiple instances of a given entity and list them in a particular order. The service.xml file lets you specify the default order of your...
Generating Model, Persistence, and Service Code
Official Documentation
Generating Model, Persistence, and Service Code Service Builder makes it easy to define models and generate model, persistence, and service code for them. You'll experience this by defining a model...
Using Upgrade Processes in Earlier Versions
Official Documentation
Using Upgrade Processes in Earlier Versions Liferay DXP 7.4 U10/Portal 7.4 GA14 and Below Follow these steps to create an upgrade process for your module: Open your module's bnd.bnd file, and...
Using Upgrade Processes
Official Documentation
Using Upgrade Processes Liferay DXP 7.4 U10+/Portal 7.4 GA14+ An upgrade of your application may require making changes to your database tables. Liferay's upgrade framework makes it easy to make...