JPA
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Enterprise Java
Query JPA Single Table Inheritance
In Java Persistence API (JPA), inheritance mapping provides a way to map Java class hierarchies to database tables. Single Table…
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Core Java
Optional Fields in JPA Entity Example
1. Introduction JPA Entity can have optional fields as not every data is needed for every operation. In this example,…
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Enterprise Java
JPA CAST vs TREAT
In JPA (Java Persistence API), managing polymorphic queries involving inheritance hierarchies is a crucial aspect. When working with such queries,…
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Core Java
JPA Inheritance vs Composition Spring Boot Example
1. Introduction Inheritance is an “IS-A” type of relationship in object-oriented programming (OOP). Inheritance is tightly coupled since child classes…
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Core Java
Resolving PostgreSQL JSON Type Mismatch Errors in JPA
When working with PostgreSQL and Java Persistence API (JPA), you might encounter a common error related to JSON data types.…
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Enterprise Java
How to Fix PSQLException Operator Does Not Exist Character Varying = UUID
When working with Spring JPA and PostgreSQL, you might encounter an error like PSQLException: Operator Does Not Exist: character varying…
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Core Java
Fixing the JPA “Could Not Determine Recommended JdbcType for Class” Error
When working with Hibernate and Jakarta Persistence API (JPA), you might encounter the error: Could not determine recommended JdbcType for…
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Enterprise Java
Integrating Java Enums with JPA and PostgreSQL Enums
Enums are a powerful feature in Java, allowing us to define a fixed set of constants. When using JPA (Java…
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Enterprise Java
Using Enum in Spring Data JPA Queries
When constructing our persistence layer using Spring Data JPA, we frequently deal with entities that contain enum fields. These enum…
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