Flyway.API操作&源码分析

 对象创建

org.springframework.boot.autoconfigure.flyway.FlywayAutoConfiguration

Flyway flyway = new SpringBootFlyway();

flyway.setDataSource(javax.sql.DataSource);

如果你配置就用配置的，如果没有配置则使用默认DataSource的。

默认对象

       当有spring.datasource 和 spring.flyway时，就创建Flyway对象，并使用spring.datasource中配置的DS。

       如果spring.flyway.url &&spring.flyway.user有配置，则使用如下作为DS，代码中第一个判断：org.flywaydb.core.internal.util.jdbc.DriverDataSource

FlywayAutoConfiguration 类中：

    @Configuration

    @ConditionalOnMissingBean(Flyway.class)

    @EnableConfigurationProperties({ DataSourceProperties.class, FlywayProperties.class })

    public static class FlywayConfiguration 

  操作列表

使用Flyway 对象操作。

// 校验

flyway.validate();

// 合并

flyway.migrate();

// 撤销

flyway.undo();

// 清空

flyway.clean();

// 基线

flyway.baseline();

// 替换

flyway.repair();

// 信息

flyway.info();

不懂看文档去：

https://flywaydb.org/documentation/usage/commandline/

多数据源操作实例

在数据源代理处创建Flyway

defaultFlyway 为默认Flyway对象

flywayManager 中包括 Map flywayMap 属性

/**

 * 构建Flyway

 */

Flyway flyway = new Flyway();

flyway.setDataSource(dataSource);

// 使用默认Location，当然可以自定义，或者使用上传的文件

flyway.setLocations(defaultFlyway.getLocations());

flywayManager.getFlywayMap().put(tenantId, flyway);

 给指定租户migrate并返回版本信息

@GetMapping("/test2")
@ResponseBody
public List test2(){
	Flyway flyway = flywayManager.getFlywayMap().get(WebCacheManager.getTenantId());
	// 校验
	flyway.validate();
	// 合并
	flyway.migrate();
	// 获取信息
	MigrationInfo[] ms =  flyway.info().all();
	
	List list = new ArrayList(ms.length);
	for(MigrationInfo m :ms){
		FlywayMigrationInfo fm = new FlywayMigrationInfo();
		fm.setType(m.getType().toString());
		fm.setChecksum(m.getChecksum());
		fm.setVersion(m.getVersion().toString());			
		fm.setExecutionTime(m.getExecutionTime());
		fm.setDescription(m.getDescription());
		fm.setScript(m.getScript());
		fm.setSuccess(m.getState().toString());
		fm.setInstalledOn(m.getInstalledOn());
		fm.setInstalledBy(m.getInstalledBy());
		fm.setInstalledRank(m.getInstalledRank());
		
		list.add(fm);
	}
	return list;
}

返回值：
{
    "message": "",
    "data": [
        {
            "version": "1",
            "type": "SQL",
            "success": "SUCCESS",
            "script": "V1__INIT_DATABASE.sql",
            "installedRank": 1,
            "installedOn": "2020-12-16T17:45:14.000+0000",
            "installedBy": "root",
            "executionTime": 60,
            "description": "INIT DATABASE",
            "checksum": -1283733132
        },
        {
            "version": "2",
            "type": "SQL",
            "success": "SUCCESS",
            "script": "V2__INIT_DATABASE2.sql",
            "installedRank": 2,
            "installedOn": "2020-12-16T17:45:14.000+0000",
            "installedBy": "root",
            "executionTime": 58,
            "description": "INIT DATABASE2",
            "checksum": 35166671
        }
    ],
    "code": 200
}

错误：Found non-empty schema(s) `demo1` without schema history table

Caused by: org.flywaydb.core.api.FlywayException: Found non-empty schema(s) `demo1` without schema history table! Use baseline() or set baselineOnMigrate to true to initialize the schema history table.

分析：找到历史版本，在demo1中

原因：数据库中原来有未控制的表

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