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+# spring-boot-demo-flyway
+
+> 本 demo 演示了 Spring Boot 如何使用 Flyway 去初始化项目数据库，同时支持数据库脚本的版本控制。
+
+## 1. 添加依赖
+
+- Flyway 依赖
+
+```xml
+
+
+ org.flywaydb
+ flyway-core
+
+```
+
+- 初始化表结构，需要操作数据库，因此引入数据库驱动以及数据源依赖（这里用 spring-boot-starter-data-jdbc）
+
+```xml
+
+ org.springframework.boot
+ spring-boot-starter-data-jdbc
+
+
+
+ mysql
+ mysql-connector-java
+ runtime
+
+```
+
+## 2. Flyway 知识补充
+
+1. Flyway 默认会去读取 `classpath:db/migration`，可以通过 `spring.flyway.locations` 去指定自定义路径，多个路径使用半角英文逗号分隔，内部资源使用 `classpath:`，外部资源使用 `file:`
+
+2. 如果项目初期没有数据库文件，但是又引用了 Flyway，那么在项目启动的时候，Flyway 会去检查是否存在 SQL 文件，此时你需要将这个检查关闭，`spring.flyway.check-location = false`
+
+3. Flyway 会在项目初次启动的时候创建一张名为 `flyway_schema_history` 的表，在这张表里记录数据库脚本执行的历史记录，当然，你可以通过 `spring.flyway.table` 去修改这个值
+
+4. Flyway 执行的 SQL 脚本必须遵循一种命名规则，`V__.sql` 首先是 `V` ，然后是版本号，如果版本号有多个数字，使用`_`分隔，比如`1_0`、`1_1`，版本号的后面是 2 个下划线，最后是 SQL 脚本的名称。
+
+ **这里需要注意：V 开头的只会执行一次，下次项目启动不会执行，也不可以修改原始文件，否则项目启动会报错，如果需要对 V 开头的脚本做修改，需要清空`flyway_schema_history`表，如果有个 SQL 脚本需要在每次启动的时候都执行，那么将 V 改为 `R` 开头即可**
+
+5. Flyway 默认情况下会去清空原始库，再重新执行 SQL 脚本，这在生产环境下是不可取的，因此需要将这个配置关闭，`spring.flyway.clean-disabled = true`
+
+## 3. application.yml 配置
+
+> 贴出我的 application.yml 配置
+
+```yaml
+spring:
+ flyway:
+ enabled: true
+ # 迁移前校验 SQL 文件是否存在问题
+ validate-on-migrate: true
+ # 生产环境一定要关闭
+ clean-disabled: true
+ # 校验路径下是否存在 SQL 文件
+ check-location: false
+ datasource:
+ url: jdbc:mysql://127.0.0.1:3306/flyway-test?useSSL=false
+ username: root
+ password: root
+ type: com.zaxxer.hikari.HikariDataSource
+```
+
+## 4. 测试
+
+### 4.1. 测试 1.0 版本的 SQL 脚本
+
+创建 `V1_0__INIT.sql`
+
+```mysql
+DROP TABLE IF EXISTS `t_user`;
+CREATE TABLE `t_user` (
+ `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '主键',
+ `username` varchar(32) NOT NULL COMMENT '用户名',
+ `password` varchar(32) NOT NULL COMMENT '加密后的密码',
+ `salt` varchar(32) NOT NULL COMMENT '加密使用的盐',
+ `email` varchar(32) NOT NULL COMMENT '邮箱',
+ `phone_number` varchar(15) NOT NULL COMMENT '手机号码',
+ `status` int(2) NOT NULL DEFAULT '1' COMMENT '状态，-1：逻辑删除，0：禁用，1：启用',
+ `create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
+ `last_login_time` datetime DEFAULT NULL COMMENT '上次登录时间',
+ `last_update_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '上次更新时间',
+ PRIMARY KEY (`id`),
+ UNIQUE KEY `username` (`username`),
+ UNIQUE KEY `email` (`email`),
+ UNIQUE KEY `phone_number` (`phone_number`)
+) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8 COMMENT='1.0-用户表';
+```
+
+启动项目，可以看到日志输出：
+
+```java
+2020-03-05 10:48:37.799 INFO 3351 --- [ main] o.f.c.internal.license.VersionPrinter : Flyway Community Edition 5.2.1 by Boxfuse
+2020-03-05 10:48:37.802 INFO 3351 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
+2020-03-05 10:48:37.971 INFO 3351 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
+2020-03-05 10:48:37.974 INFO 3351 --- [ main] o.f.c.internal.database.DatabaseFactory : Database: jdbc:mysql://127.0.0.1:3306/flyway-test (MySQL 5.7)
+2020-03-05 10:48:38.039 INFO 3351 --- [ main] o.f.core.internal.command.DbValidate : Successfully validated 1 migration (execution time 00:00.015s)
+2020-03-05 10:48:38.083 INFO 3351 --- [ main] o.f.c.i.s.JdbcTableSchemaHistory : Creating Schema History table: `flyway-test`.`flyway_schema_history`
+2020-03-05 10:48:38.143 INFO 3351 --- [ main] o.f.core.internal.command.DbMigrate : Current version of schema `flyway-test`: << Empty Schema >>
+2020-03-05 10:48:38.144 INFO 3351 --- [ main] o.f.core.internal.command.DbMigrate : Migrating schema `flyway-test` to version 1.0 - INIT
+2020-03-05 10:48:38.156 WARN 3351 --- [ main] o.f.c.i.s.DefaultSqlScriptExecutor : DB: Unknown table 'flyway-test.t_user' (SQL State: 42S02 - Error Code: 1051)
+2020-03-05 10:48:38.183 INFO 3351 --- [ main] o.f.core.internal.command.DbMigrate : Successfully applied 1 migration to schema `flyway-test` (execution time 00:00.100s)
+```
+
+检查数据库，发现创建了 2 张表，一张是 Flyway 依赖的历史表，另一张就是我们的 `t_user` 表
+
+
+
+查看下 `flyway-schema-history` 表
+
+
+
+### 4.2. 测试 1.1 版本的 SQL 脚本
+
+创建 `V1_1__ALTER.sql`
+
+```mysql
+ALTER TABLE t_user COMMENT = '用户 v1.1';
+```
+
+启动项目，可以看到日志输出：
+
+```java
+2020-03-05 10:59:02.279 INFO 3536 --- [ main] o.f.c.internal.license.VersionPrinter : Flyway Community Edition 5.2.1 by Boxfuse
+2020-03-05 10:59:02.282 INFO 3536 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
+2020-03-05 10:59:02.442 INFO 3536 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
+2020-03-05 10:59:02.445 INFO 3536 --- [ main] o.f.c.internal.database.DatabaseFactory : Database: jdbc:mysql://127.0.0.1:3306/flyway-test (MySQL 5.7)
+2020-03-05 10:59:02.530 INFO 3536 --- [ main] o.f.core.internal.command.DbValidate : Successfully validated 2 migrations (execution time 00:00.018s)
+2020-03-05 10:59:02.538 INFO 3536 --- [ main] o.f.core.internal.command.DbMigrate : Current version of schema `flyway-test`: 1.0
+2020-03-05 10:59:02.538 INFO 3536 --- [ main] o.f.core.internal.command.DbMigrate : Migrating schema `flyway-test` to version 1.1 - ALTER
+2020-03-05 10:59:02.564 INFO 3536 --- [ main] o.f.core.internal.command.DbMigrate : Successfully applied 1 migration to schema `flyway-test` (execution time 00:00.029s)
+```
+
+检查数据库，可以发现 `t_user` 表的注释已经更新
+
+
+
+查看下 `flyway-schema-history` 表
+
+
+
+## 参考
+
+1. [Spring Boot 官方文档 - Migration 章节](https://docs.spring.io/spring-boot/docs/2.1.0.RELEASE/reference/htmlsingle/#howto-execute-flyway-database-migrations-on-startup)
+2. [Flyway 官方文档](https://flywaydb.org/documentation/)
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