Criteria API - An Example of IN Expressions|JpaSpecifications SpringBoot|IN Clause JPA Specification
In this tutorials we will learn about in clause in criteria specification. We will build support for Where In clause predicate in criteria api. In Operation helps to fetch multiple values.
Github:https://github.com/kbtutorials/Criter...
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In the Java Persistence API (JPA) and the Criteria API, you can use the CriteriaBuilder to create conditions for your queries, including the equal condition, which is used to specify that two values should be equal in a query. The equal condition is used to create an equality comparison between two expressions or values in a query. Here's how you can use the equal method of the CriteriaBuilder:
About Criteria API :
The Criteria API is a feature of the Java Persistence API (JPA) that allows you to build dynamic queries for database operations using a type-safe and object-oriented approach. It is
commonly used in Java-based applications, especially those that use JPA for interacting with relational databases.
Here are some key points and concepts related to the Criteria API:
Type-Safe Queries: The Criteria API allows you to create queries using Java classes and methods, making them type-safe. This means that the compiler can catch errors at compile-time rather than at runtime.
Query Building: You build queries using the Criteria API by creating a set of objects that represent the different components of a query, such as the SELECT clause, FROM clause, WHERE clause, and so on.
CriteriaQuery: The central component of the Criteria API is the CriteriaQuery, which represents the main query structure. You start by creating a CriteriaQuery and then add various criteria and conditions to it.
CriteriaBuilder: The CriteriaBuilder is another essential component of the Criteria API. It provides factory methods for creating various query components, such as predicates and expressions.
Root and Path: In Criteria API, you use the Root and Path interfaces to define the attributes and relationships of the entities you're querying. A Root represents the main entity you are querying, and a Path represents an attribute or relationship of an entity.
Predicates: Predicates are conditions that you can add to a query to filter and narrow down the results. You can use CriteriaBuilder to create predicates like equal, not equal, greater than, less than, and more.
Joining: The Criteria API supports different types of joins to work with related entities. You can use the join method to specify how entities are related in your query.
Projections: You can specify which attributes or expressions to include in the query result by using the select method in the CriteriaQuery. This allows you to project only the data you need.
Execution: Once you have constructed a CriteriaQuery, you can use it to create a TypedQuery or Query that can be executed against a JPA EntityManager to fetch or manipulate data.
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