Spring Boot - Loading Initial Data

Question

I m wondering what the best way to load initial database data before the application starts  What I m looking for is something that will fill my H2 database with data   For example  I have a domain model  User  I can access users by going to  users but initially there won t be any users in the database so I have to create them  Is there anyway to fill the database with data automatically   At the moment I have a Bean that gets instantiated by the container and creates users for me   Example    Component public class DataLoader        private UserRepository userRepository        Autowired     public DataLoader UserRepository userRepository            this userRepository   userRepository          LoadUsers               private void LoadUsers             userRepository save new User  lala    lala    lala               But I very much doubt that is the best way of doing it  Or is it

User · Answer

I solved similar problem this way    Component public class DataLoader         Autowired     private UserRepository userRepository         method invoked during the startup      PostConstruct     public void loadData             userRepository save new User  user                  method invoked during the shutdown      PreDestroy     public void removeData             userRepository deleteAll

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Spring Boot allows you to use a simple script to initialize your database  using Spring Batch   Still  if you want to use something a bit more elaborated to manage DB versions and so on  Spring Boot integrates well with Flyway   See also    Spring Boot Database initialization

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If someone are struggling in make this to work even following the accepted answer  for me only work adding in my src test resources application yml the H2 datasource details   spring    datasource      platform  h2     url  jdbc h2 mem test DB CLOSE DELAY -1     driver-class-name  org h2 Driver     username  sa     password

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The most compact  for dynamic data  put  mathias-dpunkt solution into MainApp  with Lombok  AllArgsConstructor     SpringBootApplication  AllArgsConstructor public class RestaurantVotingApplication implements ApplicationRunner     private final VoteRepository voteRepository    private final UserRepository userRepository     public static void main String   args        SpringApplication run RestaurantVotingApplication class  args           Override   public void run ApplicationArguments args        voteRepository save new Vote userRepository getOne 1   LocalDate now    LocalTime now

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I created a library that facilitates initial demo data loading in a Spring Boot application  You can find it at https   github com piotrpolak spring-boot-data-fixtures Once the data fixtures starter is on the classpath  it will automatically try to load DICTIONARY data upon application startup  this behavior can be controlled by properties  - all you need to do is to register a bean implementing DataFixture  I find loading initial data by code superior to loading it using SQL scripts   the logic of your fixtures lives close to your application logic domain model and it is subject to refactoring as your domain evolves you benefit from incremental demo data updates - imagine a QA environment with some user data  that needs not to be lost after application deploy  but at the same time you want to add data for the new features you developed  Example data fixture         You can have as many fixture classes as you want      Order annotation is respected for the fixtures belonging to the same set     You can make your demo database to be incrementally updated with fresh data    each time the application is redeployed - all you need to do is to write    a good condition in  canBeLoaded    method       Component public class InitialDataFixture implements DataFixture        private final LanguageRepository languageRepository                    Override     public DataFixtureSet getSet           return DataFixtureSet DICTIONARY                        We want to make sure the fixture is applied once and once only         A more sophisticated condition can be used to create incremental demo data        over time without the need to reset the QA database  for example                Override     public boolean canBeLoaded           return languageRepository size      0                        The actual application of the fixture         Assuming that data fixtures are registered as beans  this method can call        other services and or repositories               Override     public void load           languageRepository saveAll Arrays asList            new Language  quot en-US quot    new Language  quot pl-PL quot               The concept is inspired by the Symfony Doctrine Data Fixtures bundle

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This will also work        Bean     CommandLineRunner init  StudentRepo studentRepo           return args - gt                   Adding two students objects             List lt String gt  names   Arrays asList  udara    sampath                names forEach name - gt  studentRepo save new Student name

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You can simply create a import sql file in src main resources and Hibernate will execute it when the schema is created

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If you want to insert only few rows and u have JPA Setup  You can use below       SpringBootApplication          Slf4j         public class HospitalManagementApplication                public static void main String   args                    SpringApplication run HospitalManagementApplication class  args                                           Bean             ApplicationRunner init PatientRepository repository                    return  ApplicationArguments args  - gt   dataSetup repository                               public void dataSetup PatientRepository repository                 inserts

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You can add a spring datasource data property to application properties listing the sql files you want to run   Like this  spring datasource data classpath accounts sql  classpath books sql  classpath reviews sql  The sql insert statements in each of these files will then be run  allowing you to keep things tidy  If you put the files in the classpath  for example in src main resources they will be applied  Or replace classpath  with file  and use an absolute path to the file If you want to run DDL type SQL then use  spring datasource schema classpath create account table sql  Edit  these solutions are great to get you up and running quickly  however for a more production ready solution it would be worth looking at a framework such as flyway  or liquibase  These frameworks integrate well with spring  and provide a quick  consistent  version-controlled means of initialising schema  and standing-data

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If I just want to insert simple test data I often implement a ApplicationRunner  Implementations of this interface are run at application startup and can use e g  a autowired repository to insert some test data   I think such an implementation would be slightly more explicit than yours because the interface implies that your implementation contains something you would like to do directly after your application is ready   Your implementation would look sth  like this    Component public class DataLoader implements ApplicationRunner        private UserRepository userRepository        Autowired     public DataLoader UserRepository userRepository            this userRepository   userRepository             public void run ApplicationArguments args            userRepository save new User  lala    lala    lala

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You can use something like this    SpringBootApplication   public class Application     Autowired private UserRepository userRepository   public static void main String   args        SpringApplication run Application class  args       Bean InitializingBean sendDatabase         return    - gt            userRepository save new User  John             userRepository save new User  Rambo

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You can create a data sql file in your src main resources folder and it will be automatically executed on startup  In this file you can add some insert statements  eg   INSERT INTO users  username  firstname  lastname  VALUES     lala    lala    lala        lolo    lolo    lolo      Similarly  you can create a schema sql file  or schema-h2 sql  as well to create your schema  CREATE TABLE task     id          INTEGER PRIMARY KEY    description VARCHAR 64  NOT NULL    completed   BIT NOT NULL    Though normally you shouldn t have to do this since Spring boot already configures Hibernate to create your schema based on your entities for an in memory database  If you really want to use schema sql you ll have to disable this feature by adding this to your application properties  spring jpa hibernate ddl-auto none  More information can be found at the documentation about Database initialization   If you re using Spring boot 2  database initialization only works for embedded databases  H2  HSQLDB        If you want to use it for other databases as well  you need to change the spring datasource initialization-mode property  spring datasource initialization-mode always   If you re using multiple database vendors  you can name your file data-h2 sql or data-mysql sql depending on which database platform you want to use  To make that work  you ll have to configure the spring datasource platform property though  spring datasource platform h2

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You re almost there    Component public class DataLoader implements CommandLineRunner        private UserRepository userRepository       public DataLoader UserRepository userRepository            this userRepository   userRepository              Override     public void run String    args  throws Exception            LoadUsers              private void LoadUsers             userRepository save new User  lala    lala    lala

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One possibility is using incorrect JDBC URL  make sure it is jdbc h2 mem testdb

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you can register and event listener to achieve that like below    EventListener public void seed ContextRefreshedEvent event        userRepository save new User  lala    lala    lala         When the ContextRefreshEvent is fired  we get access to all autowired beans in the application     including models and repositories

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You can use the below code  In the following code a database insertion occurs during the startup of the spring boot application   SpringBootApplication public class Application implements CommandLineRunner             Autowired     private IService lt Car gt  service       public static void main String   args            SpringApplication run Application class  args               Override     public void run String    args  throws Exception           for int i 1  i lt  1000  i                  Car car   new Car                car setName  quot Car Name  quot  i               book setPrice 50   i               service saveOrUpdate car

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Here is the way I got that    Component public class ApplicationStartup implements ApplicationListener lt ApplicationReadyEvent gt                    This event is executed as late as conceivably possible to indicate that        the application is ready to service requests                Autowired     private MovieRepositoryImpl movieRepository        Override     public void onApplicationEvent final ApplicationReadyEvent event            seedData               private void seedData             movieRepository save new Movie  Example                     add more code            Thanks to the author of this article   http   blog netgloo com 2014 11 13 run-code-at-spring-boot-startup

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In Spring Boot 2 data sql was not working with me as in spring boot 1 5     import sql   In addition  a file named import sql in the root of the classpath is executed on startup if Hibernate creates the schema from scratch  that is  if the ddl-auto property is set to create or create-drop     Note very important if you insert Keys cannot be duplicated do not use ddl-auto property is set to update because with each restart will insert same data again  For more information you vist spring websit  https   docs spring io spring-boot docs current reference html howto-database-initialization html

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As suggestion try this    Bean public CommandLineRunner loadData CustomerRepository repository        return  args  - gt               save a couple of customers         repository save new Customer  Jack    Bauer             repository save new Customer  Chloe    O Brian             repository save new Customer  Kim    Bauer             repository save new Customer  David    Palmer             repository save new Customer  Michelle    Dessler                 fetch all customers         log info  Customers found with findAll               log info  -------------------------------            for  Customer customer   repository findAll                  log info customer toString                       log info                  fetch an individual customer by ID         Customer customer   repository findOne 1L           log info  Customer found with findOne 1L              log info  --------------------------------            log info customer toString             log info                  fetch customers by last name         log info  Customer found with findByLastNameStartsWithIgnoreCase  Bauer               log info  --------------------------------------------            for  Customer bauer   repository                  findByLastNameStartsWithIgnoreCase  Bauer                  log info bauer toString                       log info                Option 2  Initialize with schema and data scripts   Prerequisites  in application properties you have to mention this   spring jpa hibernate ddl-auto none  otherwise scripts will be ignored by hibernate  and it will scan project for  Entity and or  Table annotated classes   Then  in your MyApplication class paste this    Bean name    dataSource   public DriverManagerDataSource dataSource         DriverManagerDataSource dataSource   new DriverManagerDataSource        dataSource setDriverClassName  org h2 Driver        dataSource setUrl  jdbc h2   myDB MV STORE false        dataSource setUsername  sa        dataSource setPassword              schema init     Resource initSchema   new ClassPathResource  scripts schema-h2 sql        Resource initData   new ClassPathResource  scripts data-h2 sql        DatabasePopulator databasePopulator   new ResourceDatabasePopulator initSchema  initData       DatabasePopulatorUtils execute databasePopulator  dataSource        return dataSource      Where scripts folder is located under resources folder  IntelliJ Idea   Hope it helps someone

[spring] Spring Boot - Loading Initial Data

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