Connect to TiDB with Hibernate

TiDB is a MySQL-compatible database, and Hibernate is a popular open-source Java ORM. Starting from version 6.0.0.Beta2, Hibernate supports TiDB dialect, which fits TiDB features well.

In this tutorial, you can learn how to use TiDB and Hibernate to accomplish the following tasks:

• Set up your environment.
• Connect to your TiDB cluster using Hibernate.
• Build and run your application. Optionally, you can find sample code snippets for basic CRUD operations.

Prerequisites

To complete this tutorial, you need:

• Java Development Kit (JDK) 17 or higher. You can choose OpenJDK or Oracle JDK based on your business and personal requirements.
• Maven 3.8 or higher.
• Git.
• A TiDB cluster.

If you don't have a TiDB cluster, you can create one as follows:

• (Recommended) Follow Creating a TiDB Serverless cluster to create your own TiDB Cloud cluster.
• Follow Deploy a local test TiDB cluster or Deploy a production TiDB cluster to create a local cluster.

Run the sample app to connect to TiDB

This section demonstrates how to run the sample application code and connect to TiDB.

Step 1: Clone the sample app repository

Run the following commands in your terminal window to clone the sample code repository:

git clone https://github.com/tidb-samples/tidb-java-hibernate-quickstart.git
cd tidb-java-hibernate-quickstart

Step 2: Configure connection information

Connect to your TiDB cluster depending on the TiDB deployment option you've selected.

• TiDB Serverless
• TiDB Dedicated
• TiDB Self-Hosted

Step 3: Run the code and check the result

1. Execute the following command to run the sample code:

   make
   

2. Check the Expected-Output.txt to see if the output matches.

Sample code snippets

You can refer to the following sample code snippets to complete your own application development.

For complete sample code and how to run it, check out the tidb-samples/tidb-java-hibernate-quickstart repository.

Connect to TiDB

Edit the Hibernate configuration file hibernate.cfg.xml:

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>

        <!-- Database connection settings -->
        <property name="hibernate.connection.driver_class">com.mysql.cj.jdbc.Driver</property>
        <property name="hibernate.dialect">org.hibernate.dialect.TiDBDialect</property>
        <property name="hibernate.connection.url">${tidb_jdbc_url}</property>
        <property name="hibernate.connection.username">${tidb_user}</property>
        <property name="hibernate.connection.password">${tidb_password}</property>
        <property name="hibernate.connection.autocommit">false</property>

        <!-- Required so a table can be created from the 'PlayerDAO' class -->
        <property name="hibernate.hbm2ddl.auto">create-drop</property>

        <!-- Optional: Show SQL output for debugging -->
        <property name="hibernate.show_sql">true</property>
        <property name="hibernate.format_sql">true</property>
    </session-factory>
</hibernate-configuration>

Be sure to replace ${tidb_jdbc_url}, ${tidb_user}, and ${tidb_password} with the actual values of your TiDB cluster. Then, define the following function:

public SessionFactory getSessionFactory() {
    return new Configuration()
            .configure("hibernate.cfg.xml")
            .addAnnotatedClass(${your_entity_class})
            .buildSessionFactory();
}

When using this function, you need to replace ${your_entity_class} with your own data entity class. For multiple entity classes, you need to add a .addAnnotatedClass(${your_entity_class}) statement for each. The preceding function is just one way to configure Hibernate. If you encounter any issues in the configuration or want to learn more about Hibernate, refer to the Hibernate official documentation.

Insert or update data

try (Session session = sessionFactory.openSession()) {
    session.persist(new PlayerBean("id", 1, 1));
}

For more information, refer to Insert data and Update data.

Query data

try (Session session = sessionFactory.openSession()) {
    PlayerBean player = session.get(PlayerBean.class, "id");
    System.out.println(player);
}

For more information, refer to Query data.

Delete data

try (Session session = sessionFactory.openSession()) {
    session.remove(new PlayerBean("id", 1, 1));
}

For more information, refer to Delete data.

Next steps

• Learn more usage of Hibernate from the documentation of Hibernate.
• Learn the best practices for TiDB application development with the chapters in the Developer guide, such as Insert data, Update data, Delete data, Single table reading, Transactions, and SQL performance optimization.
• Learn through the professional TiDB developer courses and earn TiDB certifications after passing the exam.
• Learn through the course for Java developers: Working with TiDB from Java.

Need help?

Ask questions on the Discord, or create a support ticket.