Running H2 in SQL Server Mode With Custom Schema Name on Connection

栏目: IT技术 · 发布时间: 4年前

内容简介:These days I am working on a multi-tenant SaaS application where we are using SQL Server as our main transactional database. Using SQL Server is fine when you run the application but for unit and integration tests you want to use an in-memory database for

These days I am working on a multi-tenant SaaS application where we are using SQL Server as our main transactional database. Using SQL Server is fine when you run the application but for unit and integration tests you want to use an in-memory database for quick turn around, better isolation, free from any external service to be available. Last thing you want is developers to not write tests because they take too much time to run. I love the experience of running a build on a clean machine and it works without any setup or configuration.

The problem that you face with in-memory database is that when you start using native SQL queries then compatibility becomes an issue. JPA/hibernate cause performance issues and many times you have to use native SQL queries.

I want to use in-memory database but at the same time I don’t want my tests to fail as soon as I use native SQL queries.

I figured out that H2 supports a mode option that H2 uses to emulate behaviour of specific database.

To run H2 in SQL Server mode you can use following JDBC URL.

jdbc:h2:mem:testdb;MODE=MSSQLServer

If you are using Spring Boot then you can specify using the following property.

spring.datasource.url=jdbc:h2:mem:testdb;MODE=MSSQLServer

As you can see we have specify mode as MSSQLServer . With this mode, H2 emulates following features:

  • For aliased columns, ResultSetMetaData.getColumnName() returns the alias name and getTableName() returns null .
  • Identifiers may be quoted using square brackets as in [Test] .
  • For unique indexes, NULL is distinct. That means only one row with NULL in one of the columns is allowed.
  • Concatenating NULL with another value results in the other value.
  • Text can be concatenated using ‘+’.
  • Arguments of LOG() function are swapped.
  • MONEY data type is treated like NUMERIC(19, 4) data type. SMALLMONEY data type is treated like NUMERIC(10, 4) data type.
  • IDENTITY can be used for automatic id generation on column level.
  • Table hints are discarded. Example: SELECT * FROM table WITH (NOLOCK) .
  • Datetime value functions return the same value within a command.
  • 0x literals are parsed as binary string literals.
  • TRUNCATE TABLE restarts next values of generated columns.

One more requirement that we had was to use specific schema names. Our entity classes and repository interface are using schema name like shown below.

@Table(schema = "[masters]", name = "[users]")
public class UserEntity
public interface UserRepository extends JpaRepository<UserEntity, Long> {

    @Override
    @Query(value = "select * from [masters].[users] where active = 1", nativeQuery = true)
    List<UserEntity> findAll();

So, we had to make tell H2 to use specify schema.

I was able to achieve that using following

jdbc:h2:mem:testdb;MODE=MSSQLServer;INIT=CREATE SCHEMA IF NOT EXISTS [masters]\\;SET SCHEMA [masters]

So, we used INIT option to specific two SQL queries — first create schema and second set the schema that H2 will use.

Conclusion

It took me couple of hours to get all of this running and make my tests pass. I hope it saves your time if you end up using this setup.


以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持 码农网

查看所有标签

猜你喜欢:

本站部分资源来源于网络,本站转载出于传递更多信息之目的,版权归原作者或者来源机构所有,如转载稿涉及版权问题,请联系我们

JSP信息系统开发实例精选

JSP信息系统开发实例精选

赛奎春 / 机械工业出版社 / 2006-1 / 44.00元

本书精选了大学生就业求职网、物流短信平台、化奥汽车销售集团网站、佳美网络购物中心、科研成果申报管理系统、安瑞奥国际商务不院招生网、明日宽带影院、雄霸天下游戏网等8个综合的网络信息系统工程作为案例,深入剖析了实际的网络信息系统的开发思路、方法和技巧。帮助读者透彻掌握JSP开发网络信息系统的方法和步骤,从而设计出具有实用价值和商用价值的信息系统。   本书产例具有很强的实用性和工程实践性,在讲解......一起来看看 《JSP信息系统开发实例精选》 这本书的介绍吧!

HTML 编码/解码
HTML 编码/解码

HTML 编码/解码

Markdown 在线编辑器
Markdown 在线编辑器

Markdown 在线编辑器

正则表达式在线测试
正则表达式在线测试

正则表达式在线测试