mysql的内存数据库,MySQL内存数据库的新选择-MariaDB4J
H2 不香么? 為什么使用MariaDB4J ?
談到在測(cè)試中使用內(nèi)存數(shù)據(jù)庫(kù)，估計(jì)首先想到的就是H2了。使用時(shí)也非常方便，只要在下述SpringBoot的配置文件里修改一下datasource即可。application.propertiesspring.datasource.url=jdbc:h2:mem:testdb
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=sa
spring.datasource.password=
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
然后一個(gè)名字為testdb的數(shù)據(jù)庫(kù)就就緒了。如果要導(dǎo)入數(shù)據(jù)庫(kù)表和基礎(chǔ)數(shù)據(jù)的話，也只要在src/test/resouces下面提供如下兩個(gè)文件
schema.sql – 創(chuàng)建schema和表
data.sql – 導(dǎo)入基礎(chǔ)數(shù)據(jù)
看上去是不是很方便呢？
不過(guò)隨著在項(xiàng)目中使用的深入，就發(fā)現(xiàn)了一些問(wèn)題語(yǔ)法上兼容性(如注釋)以及產(chǎn)品功能上的問(wèn)題(如多層臨時(shí)表)，具體可以關(guān)注筆者之前整理的一個(gè)list。如果選擇繼續(xù)使用H2,就需要團(tuán)隊(duì)為H2去維護(hù)另外一套H2專用的schema。因此，使用MySQL的團(tuán)隊(duì)需要額外尋找一個(gè)H2的替代品，一個(gè)更兼容MySQL的內(nèi)存數(shù)據(jù)庫(kù)。
經(jīng)過(guò)一番搜索，MariaDB4J 終于走進(jìn)了團(tuán)隊(duì)的視野。https://github.com/vorburger/MariaDB4j這個(gè)開(kāi)源項(xiàng)目的目標(biāo)就是讓用戶use MariaDB (MySQL(R)) from Java without ANY installation / external dependencies
在SpringBoot項(xiàng)目中使用
來(lái)看看如何使用它。以下是一個(gè)測(cè)試專用的App基類package com.testlink4j;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Configuration;
import ch.vorburger.mariadb4j.springframework.MariaDB4jSpringService;
@Configuration
@SpringBootApplication
// mapper 接口類掃描包配置
@MapperScan("com.testlink4j.dao")
public class TestApplication{//extends Application {
public static void main(String[] args){
SpringApplication.run(TestApplication.class,args);
}
private final MariaDB4jSpringService mariaDB4JSpringService;
@Autowired
public TestApplication (MariaDB4jSpringService mariaDB4JSpringService){
this.mariaDB4JSpringService= mariaDB4JSpringService;
}
}
通過(guò)給Spring應(yīng)用提供一個(gè)測(cè)試用的TestApplication，并提供一個(gè)帶有MariaDB4jSpringService 作為入?yún)?#xff0c;就可以實(shí)現(xiàn)數(shù)據(jù)庫(kù)的啟動(dòng)了。. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.2.5.RELEASE)
INFO 7264 --- [ main] c.t.s.impl.TestProjectServiceImplTest : No active profile set, falling back to default profiles: default
.s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 35ms. Found 0 JPA repository interfaces.
INFO 7264 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 0 (http)
INFO 7264 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
INFO 7264 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.31]
INFO 7264 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
INFO 7264 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 7118 ms
INFO 7264 --- [ main] ch.vorburger.mariadb4j.DB : Installation complete.
INFO 7264 --- [ main] ch.vorburger.mariadb4j.DB : Starting up the database...
INFO 7264 --- [ main] ch.vorburger.mariadb4j.DB : Database startup complete.
INFO 7264 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
INFO 7264 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
INFO 7264 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 51602 (http) with context path ''
INFO 7264 --- [ main] c.t.s.impl.TestProjectServiceImplTest : Started TestProjectServiceImplTest in 21.636 seconds (JVM running for 24.737)
INFO 7264 --- [ main] c.t.s.impl.TestProjectServiceImplTest :
我們可以看到，在Spring容器啟動(dòng)初期，會(huì)安裝、啟動(dòng)一個(gè)mariadb4j并裝載schema和data。
SpringBoot中的配置
在application-test.properties文件中使用如下配置，#Location of db files. delete this directory if you need to recreate from scratch
mariaDB4j.dataDir=./data/local
#Default is 3306, so using 3307 just in case it is already running on this machine
mariaDB4j.port=3307
app.mariaDB4j.databaseName=testdb
spring.datasource.url=jdbc:mariadb://localhost:3307/
spring.datasource.username=root
spring.datasource.password=
spring.datasource.driver-class-name=org.mariadb.jdbc.Driver
spring.jpa.database-platform=org.hibernate.dialect.MySQL5InnoDBDialect
總結(jié)
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