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Using Liquibase MongoDB

Liquibase is an open source tool for database schema change management, it allows managing MongoDB databases via it’s MongoDB Extension.

Quarkus provides first class support for using Liquibase MongoDB Extension as will be explained in this guide.

完整源码

We recommend that you follow the instructions in the next sections and create the application step by step. However, you can go right to the completed example.

Clone the Git repository: git clone https://github.com/quarkusio/quarkus-quickstarts.git, or download an archive.

The solution is located in the liquibase-mongodb-quickstart directory.

Setting up support for Liquibase

To start using the Liquibase MongoDB Extension with your project, you just need to:

add your changeLog to the src/main/resources/db/changeLog.xml file as you usually do with Liquibase
activate the migrate-at-start option to migrate the schema automatically or inject the Liquibase object and run your migration as you normally do.

You can add the liquibase-mongodb extension to your project by running the following command in your project base directory:

CLI

quarkus extension add liquibase-mongodb

Maven

./mvnw quarkus:add-extension -Dextensions='liquibase-mongodb'

Gradle

./gradlew addExtension --extensions='liquibase-mongodb'

This will add the following to your build file:

pom.xml

<dependency>
    <groupId>io.quarkus</groupId>
    <artifactId>quarkus-liquibase-mongodb</artifactId>
</dependency>

build.gradle

implementation("io.quarkus:quarkus-liquibase-mongodb")

The Liquibase MongoDB extension support relies on the Quarkus MongoDB client config. For the time being, it does not support multiple clients. You need to add the MongoDB config to the application.properties file in order to allow Liquibase to manage the schema.

The following is an example for the application.properties file:

# configure MongoDB
quarkus.mongodb.connection-string = mongodb://localhost:27017

# Liquibase MongoDB minimal config properties
quarkus.liquibase-mongodb.migrate-at-start=true

# Liquibase MongoDB optional config properties
# quarkus.liquibase-mongodb.change-log=db/changeLog.xml
# quarkus.liquibase-mongodb.validate-on-migrate=true
# quarkus.liquibase-mongodb.clean-at-start=false
# quarkus.liquibase-mongodb.contexts=Context1,Context2
# quarkus.liquibase-mongodb.labels=Label1,Label2
# quarkus.liquibase-mongodb.default-catalog-name=DefaultCatalog
# quarkus.liquibase-mongodb.default-schema-name=DefaultSchema

Liquibase MongoDB is configured using a connection string, we do our best to craft a connection string that matches the MongoDB client configuration but if some configuration properties are not working you may consider adding them directly into the quarkus.mongodb.connection-string config property.

Add a changeLog file to the default folder following the Liquibase naming conventions: src/main/resources/db/changeLog.xml YAML, JSON and XML formats are supported for the changeLog.

<?xml version="1.1" encoding="UTF-8" standalone="no"?>
<databaseChangeLog
        xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:ext="http://www.liquibase.org/xml/ns/dbchangelog-ext"
        xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog https://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-latest.xsd
        http://www.liquibase.org/xml/ns/dbchangelog-ext https://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-ext.xsd">

    <changeSet id="1" author="loic">
        <ext:createCollection collectionName="Fruit"/>

        <ext:createIndex collectionName="Fruit">
            <ext:keys>{color: 1}</ext:keys>
            <ext:options>{name: "colorIdx"}</ext:options>
        </ext:createIndex>

        <ext:insertOne collectionName="Fruit">
            <ext:document>{"name":"orange", "color": "orange"}</ext:document>
        </ext:insertOne>
    </changeSet>

</databaseChangeLog>

Now you can start your application and Quarkus will run the Liquibase’s update method according to your config.

Using the Liquibase object

In case you are interested in using the Liquibase object directly, you can inject it as follows:

If you enabled the quarkus.liquibase.migrate-at-start property, by the time you use the Liquibase instance, Quarkus will already have run the migrate operation.

import io.quarkus.liquibase.LiquibaseFactory;

@ApplicationScoped
public class MigrationService {
    // You can Inject the object if you want to use it manually
    @Inject
    LiquibaseMongodbFactory liquibaseMongodbFactory; (1)

    public void checkMigration() {
        // Use the liquibase instance manually
        try (Liquibase liquibase = liquibaseFactory.createLiquibase()) {
            liquibase.dropAll(); (2)
            liquibase.validate();
            liquibase.update(liquibaseFactory.createContexts(), liquibaseFactory.createLabels());
            // Get the list of liquibase change set statuses
            List<ChangeSetStatus> status = liquibase.getChangeSetStatuses(liquibaseFactory.createContexts(), liquibaseFactory.createLabels()); (3)
        }
    }
}

1	Inject the LiquibaseFactory object
2	Use the Liquibase instance directly
3	List of applied or not applied liquibase ChangeSets

Liquibase Mongodb on Kubernetes

Sometimes, it’s helpful not to execute Liquibase initialization on each application startup. One such example is when deploying on Kubernetes, where it doesn’t make sense to execute Liquibase on every single replica. Instead it’s desirable to execute it once and then start the actual application without Liquibase. To support this use case, when generating manifests for Kubernetes the generated manifests contain a Kubernetes initialization Job for Liquibase. The Job performs initialization and the actual Pod, will starts once the Job is successfully completed.

Disabling

The feature is enabled by default and can be globally disabled, using:

quarkus.kubernetes.init-task-defaults.enabled=false

or on OpenShift:

quarkus.openshift.init-task-defaults.enabled=false

Using a custom image that controls waiting for the Job

To change the wait-for image which by default is groundnuty/k8s-wait-for:no-root-v1.7 you can use:

quarkus.kubernetes.init-task-defaults.wait-for-container.image=my/wait-for-image:1.0

or on Openshift:

quarkus.openshift.init-task-defaults.wait-for-container.image=my/wait-for-image:1.0

Note: In this context globally means for all extensions that support init task externalization.

Configuration Reference

Configuration property fixed at build time - All other configuration properties are overridable at runtime

Configuration property	Type	Default
`quarkus.liquibase-mongodb.change-log` The change log file Environment variable: `QUARKUS_LIQUIBASE_MONGODB_CHANGE_LOG` Show more	string	`db/changeLog.xml`
`quarkus.liquibase-mongodb.enabled` Flag to enable / disable Liquibase. Environment variable: `QUARKUS_LIQUIBASE_MONGODB_ENABLED` Show more	boolean	`true`
`quarkus.liquibase-mongodb.migrate-at-start` The migrate at start flag Environment variable: `QUARKUS_LIQUIBASE_MONGODB_MIGRATE_AT_START` Show more	boolean	`false`
`quarkus.liquibase-mongodb.validate-on-migrate` The validate on update flag Environment variable: `QUARKUS_LIQUIBASE_MONGODB_VALIDATE_ON_MIGRATE` Show more	boolean	`true`
`quarkus.liquibase-mongodb.clean-at-start` The clean at start flag Environment variable: `QUARKUS_LIQUIBASE_MONGODB_CLEAN_AT_START` Show more	boolean	`false`
`quarkus.liquibase-mongodb.contexts` The list of contexts Environment variable: `QUARKUS_LIQUIBASE_MONGODB_CONTEXTS` Show more	list of string
`quarkus.liquibase-mongodb.labels` The list of labels Environment variable: `QUARKUS_LIQUIBASE_MONGODB_LABELS` Show more	list of string
`quarkus.liquibase-mongodb.default-catalog-name` The default catalog name Environment variable: `QUARKUS_LIQUIBASE_MONGODB_DEFAULT_CATALOG_NAME` Show more	string
`quarkus.liquibase-mongodb.default-schema-name` The default schema name Environment variable: `QUARKUS_LIQUIBASE_MONGODB_DEFAULT_SCHEMA_NAME` Show more	string
`quarkus.liquibase-mongodb.liquibase-catalog-name` The liquibase tables catalog name Environment variable: `QUARKUS_LIQUIBASE_MONGODB_LIQUIBASE_CATALOG_NAME` Show more	string
`quarkus.liquibase-mongodb.liquibase-schema-name` The liquibase tables schema name Environment variable: `QUARKUS_LIQUIBASE_MONGODB_LIQUIBASE_SCHEMA_NAME` Show more	string
`quarkus.liquibase-mongodb.liquibase-tablespace-name` The liquibase tables tablespace name Environment variable: `QUARKUS_LIQUIBASE_MONGODB_LIQUIBASE_TABLESPACE_NAME` Show more	string
`quarkus.liquibase-mongodb.change-log-parameters` The parameters to be passed to the changelog. Defined as key value pairs. Environment variable: `QUARKUS_LIQUIBASE_MONGODB_CHANGE_LOG_PARAMETERS` Show more	`Map<String,String>`

Configuration property

Type

Default

quarkus.liquibase-mongodb.change-log

The change log file

Environment variable: QUARKUS_LIQUIBASE_MONGODB_CHANGE_LOG

string

db/changeLog.xml

quarkus.liquibase-mongodb.enabled

Flag to enable / disable Liquibase.

Environment variable: QUARKUS_LIQUIBASE_MONGODB_ENABLED

boolean