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TiDB is highly compatible with the MySQL protocol but some features are incompatible with MySQL.

For example:

  • Features that are not supported by TiDB:

    • Stored procedures and functions
    • Triggers
    • FOREIGN KEY constraints
  • Features that are different from MySQL:

    • Auto-increment ID: auto-incremental columns are globally unique in TiDB. They are incremental on a single TiDB server, but not necessarily incremental among multiple TiDB servers or allocated sequentially.

For a full list of compatibility differences, see MySQL Compatibility.

Java

This section describes how to use drivers and ORM frameworks in Java.

Java drivers

  • MySQL-JDBC
  • TiDB-JDBC

Support level: Full

You can follow the MySQL documentation to download and configure a Java JDBC driver.

For an example of how to build a complete application, see Build a Simple CRUD App with TiDB and JDBC.

Support level: Full

TiDB-JDBC is a customized Java driver based on MySQL 8.0.29. Compiled based on MySQL official version 8.0.29, TiDB-JDBC fixes the bug of multi-parameter and multi-field EOF in the prepare mode in the original JDBC, and adds features such as automatic TiCDC snapshot maintenance and the SM3 authentication plugin.

Using SM3-based authentication is only supported with the TiDB version of MySQL Connector/J.

If you use Maven, add the following content to the <dependencies></dependencies> section in the pom.xml file:

<dependency>
  <groupId>io.github.lastincisor</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>8.0.29-tidb-1.0.0</version>
</dependency>

If you need to enable SM3 authentication, add the following content to the <dependencies></dependencies> section in the pom.xml file:

<dependency>
  <groupId>io.github.lastincisor</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>8.0.29-tidb-1.0.0</version>
</dependency>
<dependency>
    <groupId>org.bouncycastle</groupId>
    <artifactId>bcprov-jdk15on</artifactId>
    <version>1.67</version>
</dependency>
<dependency>
    <groupId>org.bouncycastle</groupId>
    <artifactId>bcpkix-jdk15on</artifactId>
    <version>1.67</version>
</dependency>

If you use Gradle, add the following content to dependencies:

implementation group: 'io.github.lastincisor', name: 'mysql-connector-java', version: '8.0.29-tidb-1.0.0'
implementation group: 'org.bouncycastle', name: 'bcprov-jdk15on', version: '1.67'
implementation group: 'org.bouncycastle', name: 'bcpkix-jdk15on', version: '1.67'

Java ORM frameworks

  • Hibernate
  • MyBatis

Support level: Full

To avoid manually managing complex relationships between different dependencies of an application, you can use Gradle or Maven to get all dependencies of your application, including those indirect ones. Note that only Hibernate 6.0.0.Beta2 or above supports the TiDB dialect.

If you are using Maven, add the following to your <dependencies></dependencies>:

<dependency>
    <groupId>org.hibernate.orm</groupId>
    <artifactId>hibernate-core</artifactId>
    <version>6.0.0.CR2</version>
</dependency>

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.49</version>
</dependency>

If you are using Gradle, add the following to your dependencies:

implementation 'org.hibernate:hibernate-core:6.0.0.CR2'
implementation 'mysql:mysql-connector-java:5.1.49'

In addition, you need to specify the TiDB dialect in your Hibernate configuration file: org.hibernate.dialect.TiDBDialect, which is only supported by Hibernate 6.0.0.Beta2 or above. If your Hibernate version is earlier than 6.0.0.Beta2, upgrade it first.

Support level: Full

To avoid manually managing complex relationships between different dependencies of an application, you can use Gradle or Maven to get all dependencies of your application, including those indirect dependencies.

If you are using Maven, add the following to your <dependencies></dependencies>:

<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis</artifactId>
    <version>3.5.9</version>
</dependency>

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.49</version>
</dependency>

If you are using Gradle, add the following to your dependencies:

implementation 'org.mybatis:mybatis:3.5.9'
implementation 'mysql:mysql-connector-java:5.1.49'

For an example of using MyBatis to build a TiDB application, see Build a Simple CRUD App with TiDB and Java.

Java client load balancing

tidb-loadbalance

Support level: Full

tidb-loadbalance is a load balancing component on the application side. With tidb-loadbalance, you can automatically maintain the node information of TiDB server and distribute JDBC connections on the client using the tidb-loadbalance policies. Using a direct JDBC connection between the client application and TiDB server has higher performance than using the load balancing component.

Currently, tidb-loadbalance supports the following policies: roundrobin, random, and weight.

If you use Maven, add the following content to the element body of <dependencies></dependencies> in the pom.xml file:

<dependency>
  <groupId>io.github.lastincisor</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>8.0.29-tidb-1.0.0</version>
</dependency>
<dependency>
  <groupId>io.github.lastincisor</groupId>
  <artifactId>tidb-loadbalance</artifactId>
  <version>0.0.5</version>
</dependency>

If you use Gradle, add the following content to dependencies:

implementation group: 'io.github.lastincisor', name: 'mysql-connector-java', version: '8.0.29-tidb-1.0.0'
implementation group: 'io.github.lastincisor', name: 'tidb-loadbalance', version: '0.0.5'

Golang

This section describes how to use drivers and ORM frameworks in Golang.

Golang drivers

go-sql-driver/mysql

Support level: Full

To download and configure a Golang driver, refer to the go-sql-driver/mysql documentation.

For an example of how to build a complete application, see Build a Simple CRUD App with TiDB and Golang.

Golang ORM frameworks

GORM

Support level: Full

GORM is a popular ORM framework for Golang. To get all dependencies in your application, you can use the go get command.

go get -u gorm.io/gorm
go get -u gorm.io/driver/mysql

For an example of using GORM to build a TiDB application, see Build a Simple CRUD App with TiDB and Golang.

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