How do you use Finder method in Liferay?

How do you use Finder method in Liferay?

The steps are below.

1. Create a [Entity]FinderImpl class in the [package path].service.persistence.impl package of your service module’s src/main/java folder.
2. Define a findBy* finder method in the class you created.
3. Run Service Builder to generate the appropriate interface in the [package path].

How do you write dynamic queries in Liferay?

Dynamic Query

1. Create a custom -FinderImpl class and define a findBy- finder method in this class. Run Service Builder to generate the required interfaces and utility classes.
2. Implement your finder method using Liferay’s Dynamic Query API.
3. Add a method to your -LocalServiceImpl class that invokes your finder method.

How do I create a custom query in Liferay?

1. Step1: Create New Portlet.
2. Step2: Create Service Builder In Portlet plugin.
3. Step3:Create custom-sql under src folder.
4. Step4:Create CustomFinderImpl class.
5. Step5: Add SQL query in default.xml.
6. Step6:Create method in Finder Impl.

What are the first steps when you create a custom query using SQL?

It’s easy to do by following these steps: Specify your custom SQL. Implement your finder method. Access your finder method from your service….Next, using the Event Listing portlet as an example, you’ll learn how to accomplish these steps.

1. Step 1: Specify Your Custom SQL.
2. Step 2: Implement Your Finder Method.

What is Finder method?

Finder method allows to define custom methods which is used to fetch data from DB for different table column. In my last article on Creating Service layer with Service builder in Liferay we have seen how to create service layer for each entity in liferay through service builder.

What are dynamic queries in SQL?

Dynamic SQL is a programming technique that enables you to build SQL statements dynamically at runtime. For example, dynamic SQL lets you create a procedure that operates on a table whose name is not known until runtime.

What is custom SQL in Liferay?

Liferay custom SQL is a Service Builder-supported method for performing custom, complex queries against the database by invoking custom SQL from a finder method in your persistence layer. Service Builder helps you generate the interfaces to your finder method. Specify your custom SQL. Implement your finder method.

What is the first thing a user must do when creating a query in Query Design view?

Basic steps to create a select query

• Choose the tables or queries that you want to use as sources of data.
• Specify the fields that you want to include from the data sources.
• Optionally, specify criteria to limit the records that the query returns.

How do I write a SQL query?

How to Create a SQL Statement

1. Start your query with the select statement. select [all | distinct]
2. Add field names you want to display. field1 [,field2, 3, 4, etc.]
3. Add your statement clause(s) or selection criteria. Required:
4. Review your select statement. Here’s a sample statement:

What is injection in SQL?

SQL injection is a web security vulnerability that allows an attacker to interfere with the queries that an application makes to its database. It generally allows an attacker to view data that they are not normally able to retrieve.

What is N in dynamic SQL?

Dynamic SQL is a programming technique that could be used to write SQL queries during runtime. Dynamic SQL could be used to create general and flexible SQL queries. Use prefix N with the sp_executesql to use dynamic SQL as a Unicode string.

Which are the two main types of query technique?

Two types of queries are available, snapshot queries and continuous queries.