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背景
目前项目是 spring boot+mysql+maven，因为需要数据库版本管理，因而集成 flyway
目标
集成 flyway
对于已存在的数据库结构不影响
步骤
1. 在 pom.xml 中加入依赖
<dependency>
<groupId>org.flywaydb</groupId>
<artifactId>flyway-core</artifactId>
<version>5.2.4</version>
</dependency>
2. 在项目中，创建放置 sql 的文件夹
cd src/main/resources
mkdir db/migration
3. 导出当前数据库的 DDL 和数据文件清空数据库
导出数据库
mysqldump -uroot -p Mydb >Mydb.sql
清空数据库
drop database Mydb;
create schema Mydb default character set utf8 collate utf8_general_ci;
4. 将导出文件放置到 db/migration 中
mv Mydb.sql db/migration/V1__init.sql
5. 编译 && 运行项目
#编译打包
mvn package
#运行项目
java -jar target/myproject-0.0.1-SNAPSHOT.jar
6. 运行结果
数据库和未集成前一致，且多一个 schema_version 表，该表是 flyway 进行版本管理的主表
注意
这个方法简单粗暴，用于比数据量不大的情况
一些可以配置的 flyway 参数
方法一：在 application.properties 或者 application.yml 中配置
# FLYWAY (FlywayProperties)
spring.flyway.baseline-description=<< Flyway Baseline >> # Description to tag an existing schema with when applying a baseline.
spring.flyway.baseline-on-migrate=false # Whether to automatically call baseline when migrating a non-empty schema.
spring.flyway.baseline-version=1 # Version to tag an existing schema with when executing baseline.
spring.flyway.check-location=true # Whether to check that migration scripts location exists.
spring.flyway.clean-disabled=false # Whether to disable cleaning of the database.
spring.flyway.clean-on-validation-error=false # Whether to automatically call clean when a validation error occurs.
spring.flyway.connect-retries=0 # Maximum number of retries when attempting to connect to the database.
spring.flyway.enabled=true # Whether to enable flyway.
spring.flyway.encoding=UTF-8 # Encoding of SQL migrations.
spring.flyway.group=false # Whether to group all pending migrations together in the same transaction when applying them.
spring.flyway.ignore-future-migrations=true # Whether to ignore future migrations when reading the schema history table.
spring.flyway.ignore-ignored-migrations=false # Whether to ignore ignored migrations when reading the schema history table.
spring.flyway.ignore-missing-migrations=false # Whether to ignore missing migrations when reading the schema history table.
spring.flyway.ignore-pending-migrations=false # Whether to ignore pending migrations when reading the schema history table.
spring.flyway.init-sqls= # SQL statements to execute to initialize a connection immediately after obtaining it.
spring.flyway.installed-by= # Username recorded in the schema history table as having applied the migration.
spring.flyway.locations=classpath:db/migration # Locations of migrations scripts. Can contain the special “{vendor}” placeholder to use vendor-specific locations.
spring.flyway.mixed=false # Whether to allow mixing transactional and non-transactional statements within the same migration.
spring.flyway.out-of-order=false # Whether to allow migrations to be run out of order.
spring.flyway.password= # Login password of the database to migrate.
spring.flyway.placeholder-prefix=${# Prefix of placeholders in migration scripts.
spring.flyway.placeholder-replacement=true # Perform placeholder replacement in migration scripts.
spring.flyway.placeholder-suffix=} # Suffix of placeholders in migration scripts.
spring.flyway.placeholders= # Placeholders and their replacements to apply to sql migration scripts.
spring.flyway.repeatable-sql-migration-prefix=R # File name prefix for repeatable SQL migrations.
spring.flyway.schemas= # Scheme names managed by Flyway (case-sensitive).
spring.flyway.skip-default-callbacks=false # Whether to skip default callbacks. If true, only custom callbacks are used.
spring.flyway.skip-default-resolvers=false # Whether to skip default resolvers. If true, only custom resolvers are used.
spring.flyway.sql-migration-prefix=V # File name prefix for SQL migrations.
spring.flyway.sql-migration-separator=__ # File name separator for SQL migrations.
spring.flyway.sql-migration-suffixes=.sql # File name suffix for SQL migrations.
spring.flyway.table=flyway_schema_history # Name of the schema schema history table that will be used by Flyway.
spring.flyway.target= # Target version up to which migrations should be considered.
spring.flyway.url= # JDBC url of the database to migrate. If not set, the primary configured data source is used.
spring.flyway.user= # Login user of the database to migrate.
spring.flyway.validate-on-migrate=true # Whether to automatically call validate when performing a migration.
方法二：用环境变量配置略
参考资料
Execute Flyway Database Migrations on Startupspring boot 开箱集成 flywayExisting database setup
