Скачать или смотреть How to Connect PostgreSQL in a Gradle Project

Learn how to easily `connect PostgreSQL` in your Gradle project with a comprehensive setup. Follow this guide for configuration tips, troubleshooting advice, and more!
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How to Connect PostgreSQL in a Gradle Project: A Step-by-Step Guide

Connecting your PostgreSQL database to a Gradle project can sometimes be tricky, especially if you're newer to Spring Boot or database configuration. In this post, we will walk through the necessary steps to establish this connection successfully.

Step 1: Setting Up the Application Properties

First and foremost, you need to ensure your application.properties file is configured correctly. This file plays a crucial role in specifying the database connection properties such as the username, password, and URL. Below is a standard configuration:

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Explanation of Each Property

spring.jpa.show-sql: Tells Spring to show executed SQL statements in the console, which is useful for debugging.

spring.datasource.username: The username to connect to your PostgreSQL database.

spring.datasource.password: The password associated with the username.

spring.datasource.url: The JDBC URL pointing to your local PostgreSQL instance.

Step 2: Adding Dependencies in build.gradle

Next, you'll need to include the required dependencies in your build.gradle file. Here is a recommended setup:

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Key Dependencies Explained

spring-boot-starter-data-jdbc: Starter for using JDBC with Spring.

spring-boot-starter-data-jpa: Provides Spring Data support, enabling CRUD operations.

spring-boot-starter-web: Starter for building web applications.

Step 3: Creating the Entity Class

You also need to create a Java entity that represents a table in your PostgreSQL database. Below is a simple Person entity:

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Step 4: Creating the Repository

Next up is the repository interface. This interface allows you to perform CRUD operations on the Person entity:

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Step 5: Creating the Service

Your service class acts as a bridge between your controller and repository, managing the business logic:

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Step 6: Setting Up the Controller

In the controller, you will define the endpoints. An important change you need to make here to prevent a NullPointerException is to ensure that you properly inject the PersonService:

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Important Fixes

Replace new PersonService().create(id, name); with personService.create(id, name); to use the injected service instance.

Conclusion

Now that you have the correct setup for connecting PostgreSQL to your Gradle project, you should be able to run your application without encountering a NullPointerException.

If you encounter issues, double-check your configurations and make sure that your PostgreSQL server is running. Happy coding!