Embedded MySql

Why?

• Your tests can run on production-like environment: match version, encoding, timezone, database/schema/user settings;
• Its easy, much easier than installing right version by hand;
• You can use different versions/configuration per project without any local set-up;
• Supports multiple platforms: Windows, Linux and OSX;
• Provides constantly updated multiple versions of MySql - 5.5, 5.6, 5.7, 8.0;
• Testing matrix for all supported OSes (x86/x64) and versions (5.5, 5.6, 5.7, 8.0).

Maven

Add dependency to your pom.xml:

    <dependency>
        <groupId>com.wix</groupId>
        <artifactId>wix-embedded-mysql</artifactId>
        <version>x.y.z</version>
        <scope>test</scope>
    </dependency>

Usage

• Basic usage example
• Customizing mysqld settings
• Customizing download settings
• Multiple schemas/databases
• Resetting schemas between tests
• Using in a hermetic environment

Basic usage example

You can start an embedded mysql with defaults and a single schema:

import com.wix.mysql.EmbeddedMysql;

import static com.wix.mysql.EmbeddedMysql.anEmbeddedMysql;
import static com.wix.mysql.ScriptResolver.classPathScript;
import static com.wix.mysql.distribution.Version.v5_7_latest;

EmbeddedMysql mysqld = anEmbeddedMysql(v5_7_latest)
    .addSchema("aschema", classPathScript("db/001_init.sql"))
    .start();

//do work

mysqld.stop(); //optional, as there is a shutdown hook

Customizing mysqld settings

If you need more control in configuring embeded mysql instance, you can use MysqldConfig builder:

import com.wix.mysql.config.MysqldConfig;
import com.wix.mysql.EmbeddedMysql;
import static com.wix.mysql.ScriptResolver;

import java.util.concurrent.TimeUnit;

import static com.wix.mysql.config.MysqldConfig.aMysqldConfig;
import static com.wix.mysql.EmbeddedMysql.anEmbeddedMysql;
import static com.wix.mysql.distribution.Version.v5_6_23;
import static com.wix.mysql.config.Charset.UTF8;

MysqldConfig config = aMysqldConfig(v5_6_23)
    .withCharset(UTF8)
    .withPort(2215)
    .withUser("differentUser", "anotherPassword")
    .withTimeZone("Europe/Vilnius")
    .withTimeout(2, TimeUnit.MINUTES)
    .withServerVariable("max_connect_errors", 666)
    .build();

EmbeddedMysql mysqld = anEmbeddedMysql(config)
    .addSchema("aschema", ScriptResolver.classPathScript("db/001_init.sql"))
    .addSchema("aschema2", ScriptResolver.classPathScripts("db/*.sql"))
    .start();

//do work

mysqld.stop(); //optional, as there is a shutdown hook

Customizing download settings

In addition you can control additional settings of embedded mysql by providing configs that have base type of AdditionalConfig by providing those to anEmbeddedMysql builder:

import com.wix.mysql.EmbeddedMysql;

import static com.wix.mysql.EmbeddedMysql.anEmbeddedMysql;
import static com.wix.mysql.ScriptResolver.classPathScript;
import static com.wix.mysql.distribution.Version.v5_7_latest;
import static com.wix.mysql.config.DownloadConfig.aDownloadConfig;
import static com.wix.mysql.config.ProxyFactory.aHttpProxy;

DownloadConfig downloadConfig = aDownloadConfig()
    .withProxy(aHttpProxy("remote.host", 8080))
    .withCacheDir(System.getProperty("java.io.tmpdir"))
    .build();

EmbeddedMysql mysqld = anEmbeddedMysql(v5_7_latest, downloadConfig)
    .addSchema("aschema", classPathScript("db/001_init.sql"))
    .start();

//do work

mysqld.stop(); //optional, as there is a shutdown hook

Multiple schemas/databases

EmbeddedMysql supports multiple schemas and additional configuration options provided via SchemaConfig builder:

import com.wix.mysql.EmbeddedMysql;
import com.wix.mysql.config.SchemaConfig;

import static com.wix.mysql.EmbeddedMysql.anEmbeddedMysql;
import static com.wix.mysql.ScriptResolver.classPathScript;
import static com.wix.mysql.ScriptResolver.classPathScripts;
import static com.wix.mysql.config.SchemaConfig.aSchemaConfig;
import static com.wix.mysql.config.Charset.LATIN1;
import static com.wix.mysql.distribution.Version.v5_6_latest;

SchemaConfig schema = aSchemaConfig("aSchema")
    .withScripts(classPathScript("db/001_init.sql"))
    .withCharset(LATIN1)
    .build();

EmbeddedMysql mysqld = anEmbeddedMysql(v5_6_latest)
    .addSchema(schema)
    .addSchema("aschema2", classPathScripts("db/*.sql"))
    .start();

//do work

mysqld.stop(); //optional, as there is a shutdown hook

Resetting schemas between tests

It is intended to be started once per test-suite, but you can reset schema in between tests which recreates database and applies provided migrations:

import com.wix.mysql.EmbeddedMysql;

import static com.wix.mysql.EmbeddedMysql.anEmbeddedMysql;
import static com.wix.mysql.ScriptResolver.classPathScript;
import static com.wix.mysql.distribution.Version.v5_6_latest;

EmbeddedMysql mysqld = anEmbeddedMysql(v5_6_latest)
    .addSchema("aschema", classPathScript("db/001_init.sql"))
    .start();

//do work

mysqld.reloadSchema("aschema", classPathScript("db/001_init.sql"));

//continue on doing work

mysqld.stop(); //optional, as there is a shutdown hook

Source for examples can be found here

Using in a hermetic environment

Some build tools strongly encourages you to have tests which are isolated from the internet.
To support such a use-case you can use the wix-embedded-mysql-download-and-extract utility.
It produces a runnable jar (wix-embedded-mysql-download-and-extract-[[VERSION]]-jar-with-dependencies.jar) which you can call with java -jar wix-embedded-mysql-download-and-extract-[[VERSION]]-jar-with-dependencies.jar $downloadDir $majorVersion $minorVersion and it will download and extract the needed installer for you.
Additionally you should pass the download directory to your test so that it can configure your DownloadConfig#withCacheDir to use that directory instead of downloading it from the internet.

Dependencies

Build on top of de.flapdoodle.embed.process

How it works

• After detecting current platform and requested version, Wix Embedded MySql will download the correct version from dev.mysql.com and extract needed files to local folder. Note that this is a one-time action, where subsequent invocations use pre-downloaded/pre-extracted cached package.
• Upon execution needed files are being copied into target folder, database created, service started and post-configuration (user, schema, etc.) performed.
• On jvm shutdown mysqld process is stopped and temporary files cleaned-up.

Tested on

• latest OSX;
• ubuntu precise 32/64;
• windows 2012;

Known issues

• starting version 5.7.18, Microsoft Visual C++ 2013 Redistributable Package needs to be pre-installed on windows.
• starting version 5.5.10 libaio1.so needs to be pre-installed on linux, but that is not the case for some linux distributions. Proper error is emitted if it's missing and you have to install it manually (ex. ubuntu):

sudo apt-get install libaio1

• if tests are failing with 'Broken pipe' or 'Stream closed' exceptions on linux, you might be missing libncurses5:

sudo apt-get install libncurses5

• starting version 8.x.x more libraries from underlying os are required. Known list:

libnuma1 libssl1.0 libcrypto++6

License

Use of this source code is governed by a BSD License, which basically means you can use and modify it freely.

Similar project

MariaDB4j is an unrelated similar project.