Using MySQL JDBC Driver With Spring Boot

In this article, I will show you how to connect a MySQL database with your Spring Boot application.

All the code is available on GitHub!

Tools used in this article include:

• Spring Boot 1.5.6 release
• MySQL 5.7.X
• Maven
• Java 8
• Spring Data JPA

Project Structure

The project structure is a typical Maven structure:

Project Dependencies

Please note that the parent needs to be declared. If you are using Spring Tool Suite, you can click Spring Starter Project and it will populate this for you.

pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.michaelcgood</groupId>
    <artifactId>mysql-jdbc</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>mysql-jdbc-driver</name>
    <description>mysql jdbc driver example</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
            <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
    </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

Model

For this example application, our application will be “tracking” the last security audit of systems within a network. As this example application is meant to be simple, there will be minimal fields for the model.

Please note that there is a built-in System class in the Java library. For this reason, I would avoid using System.java as a class name for a real application.

System.java:

package com.michaelcgood.model;

import java.util.Date;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class System {

    private String name;
    private Date lastaudit;
    public Date getLastaudit() {
        return lastaudit;
    }
    public void setLastaudit(Date lastaudit) {
        this.lastaudit = lastaudit;
    }
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name="id")
    private long id;
    public long getId() {
        return id;
    }
    public void setId(long id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }

    public String toString(){
        return id+" | " + name+ " | "+ lastaudit;
    }

}

Repository

This is a simple CrudRepository, which is an interface that allows us to do CRUD (create, read, update, delete) operations.

Systemrepository.java:

package com.michaelcgood.dao;

import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;
import com.michaelcgood.model.System;

@Repository
public interface SystemRepository extends CrudRepository<System,Long> {


}

Database Initialization

Spring Boot enables the dataSource initializer by default and loads SQL scripts (schema.sql and data.sql) from the root of the classpath.

Schema.sql

Here we create the SQL file that our application will use for the Table schema:

DROP TABLE IF EXISTS system;
CREATE TABLE system (
  id INT NOT NULL AUTO_INCREMENT,
  name VARCHAR(100) NOT NULL,
  lastaudit DATE NOT NULL,
  PRIMARY KEY (id));

Data.sql

We insert example values into our database:

INSERT INTO system(name,lastaudit)VALUES('Windows Server 2012 R2 ','2017-08-11');
INSERT INTO system(name,lastaudit)VALUES('RHEL 7','2017-07-21');
INSERT INTO system(name,lastaudit)VALUES('Solaris 11','2017-08-13');

Logback.xml

This XML file is used to configure our logging:

<?xml version="1.0" encoding="UTF-8"?>
<configuration>

    <statusListener class="ch.qos.logback.core.status.NopStatusListener" />

    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <layout class="ch.qos.logback.classic.PatternLayout">
            <Pattern>
                %d{yyyy-MM-dd HH:mm:ss} %-5level %logger{36} - %msg%n
            </Pattern>
        </layout>
    </appender>

    <logger name="org.springframework.jdbc" level="error" additivity="false">
        <appender-ref ref="STDOUT"/>
    </logger>

    <logger name="com.michaelcgood" level="error" additivity="false">
        <appender-ref ref="STDOUT"/>
    </logger>

    <root level="error">
        <appender-ref ref="STDOUT"/>
    </root>

</configuration>

Configuration

We configure our datasource and JPA settings.

Application.properties:

#==== connect to mysql ======#
spring.jpa.hibernate.ddl-auto=update
spring.datasource.url=jdbc:mysql://localhost:3306/mysqltutorial?useSSL=false
spring.datasource.username=root
spring.datasource.password=
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

@springbootapplication

CommandLineRunner is implemented in order to execute command line arguments for this example.

package com.michaelcgood.app;

import javax.sql.DataSource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;

import com.michaelcgood.dao.SystemRepository;

@SpringBootApplication
@EnableJpaRepositories("com.michaelcgood.dao")
@EntityScan("com.michaelcgood.model")
public class MysqlJdbcDriverApplication implements CommandLineRunner {

    @Autowired
    DataSource dataSource;

    @Autowired
    SystemRepository systemRepository;

    public static void main(String[] args) {
        SpringApplication.run(MysqlJdbcDriverApplication.class, args);
    }

    @Override
    public void run(String... args) throws Exception {
        System.out.println("Our DataSource is = " + dataSource);
        Iterable<com.michaelcgood.model.System> systemlist = systemRepository.findAll();
        for(com.michaelcgood.model.System systemmodel:systemlist){
            System.out.println("Here is a system: " + systemmodel.toString());
        }


    }

}

Demo

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v1.5.6.RELEASE)

Our DataSource is = org.apache.tomcat.jdbc.pool.DataSource@40f70521{ConnectionPool[defaultAutoCommit=null; defaultReadOnly=null; defaultTransactionIsolation=-1; defaultCatalog=null; driverClassName=com.mysql.jdbc.Driver; maxActive=100; maxIdle=100; minIdle=10; initialSize=10; maxWait=30000; testOnBorrow=true; testOnReturn=false; timeBetweenEvictionRunsMillis=5000; numTestsPerEvictionRun=0; minEvictableIdleTimeMillis=60000; testWhileIdle=false; testOnConnect=false; password=********; url=jdbc:mysql://localhost:3306/mysqltutorial?useSSL=false; username=root; validationQuery=SELECT 1; validationQueryTimeout=-1; validatorClassName=null; validationInterval=3000; accessToUnderlyingConnectionAllowed=true; removeAbandoned=false; removeAbandonedTimeout=60; logAbandoned=false; connectionProperties=null; initSQL=null; jdbcInterceptors=null; jmxEnabled=true; fairQueue=true; useEquals=true; abandonWhenPercentageFull=0; maxAge=0; useLock=false; dataSource=null; dataSourceJNDI=null; suspectTimeout=0; alternateUsernameAllowed=false; commitOnReturn=false; rollbackOnReturn=false; useDisposableConnectionFacade=true; logValidationErrors=false; propagateInterruptState=false; ignoreExceptionOnPreLoad=false; useStatementFacade=true; }
Here is a system: 1 | Windows Server 2012 R2  | 2017-08-11 00:00:00.0
Here is a system: 2 | RHEL 7 | 2017-07-21 00:00:00.0
Here is a system: 3 | Solaris 11 | 2017-08-13 00:00:00.0

Again, the full code is on GitHub!