Скачать или смотреть How to Update a Row by ID in JPA Hibernate

Learn how to update a row in a database table by its ID using JPA Hibernate in Java. Follow this guide for a clear, step-by-step approach to efficiently update database records.
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When working with databases in Java, JPA (Java Persistence API) with Hibernate is a popular choice for ORM (Object-Relational Mapping). Updating a specific row in a database table by its ID is a common task, and JPA Hibernate makes it straightforward. In this guide, we’ll walk through the steps to update a row by ID using JPA Hibernate.

Prerequisites

Before we start, ensure you have the following:

A basic understanding of Java and JPA Hibernate.

A JPA entity class mapped to your database table.

A configured JPA EntityManager.

Step-by-Step Guide

Define the Entity

First, make sure you have an entity class that represents the table you want to update. For instance, let's say we have an Employee entity:

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Obtain an EntityManager

You need an EntityManager to interact with the database. Typically, you would inject or create it as follows:

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Start a Transaction

Before performing any database operation, start a transaction:

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Find the Entity by ID

Use the find method of the EntityManager to retrieve the entity by its ID:

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Update the Entity

Modify the properties of the entity object as needed:

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Merge the Entity

Use the merge method to update the entity in the database:

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Commit the Transaction

Finally, commit the transaction to save the changes:

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Close the EntityManager

After the operation, close the EntityManager to release resources:

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Complete Example

Here’s the complete code snippet for updating an Employee entity by its ID:

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Conclusion

Updating a row by ID in JPA Hibernate is a straightforward process involving finding the entity, modifying it, and merging the changes. This guide covered the necessary steps to perform this operation efficiently. By following these steps, you can ensure that your database updates are handled smoothly within your Java applications.