database-migration

问题 I have a Xamarin Forms app that I have switched from using only restful API to using local SQLite DB, that will sync using this Dotmim.Sync - DB Sync'ing Framework (which is great!). I am using EF Core 3 in the Xamarin forms project to interact with SQLite. My questions are around running migrations or just database updates on SQLite. I have read several blogs and forums about different approaches, but they all are several years old, from EF Core 1 to EF Core 2, and lots of work around. https

问题 I'm just learning Rails and have begun the section on database migrations. I built 2 migrations and both migrated up successfully. Migrating down, the latest migration, the one that runs first, failed because of a typo in my code. I fixed the typo but the migration continued to fail after that. I discovered the reason why was that the migrating down aborted half way through changes and then when I tried to migrate down again it failed because some of the changes had already been made and so

问题 I'm just learning Rails and have begun the section on database migrations. I built 2 migrations and both migrated up successfully. Migrating down, the latest migration, the one that runs first, failed because of a typo in my code. I fixed the typo but the migration continued to fail after that. I discovered the reason why was that the migrating down aborted half way through changes and then when I tried to migrate down again it failed because some of the changes had already been made and so

问题 I'm trying out db migrations with MySQL and Knex. When I run the command knex migrate:latest , I get ER_ACCESS_DENIED_ERROR: Access denied for user ''@'localhost' (using password: NO) I've tried adding a password on the codebase (to '123' and 'NO'), though what confuses me most is that even as I have user: "root" in my database file, the error gives an empty string as the user... I share what I imagine are the pertinent files: // mysql_db.js const knex = require('knex')({ client: 'mysql',

问题 I'm trying to use flyway, but I have a scenario that does not know how to resolve: When I apply the STANDARD scripts, I have to run V1.0__create_table_TAB1.sql When I apply the scripts to customer1, the TAB1 table is a view, and so I have to run V1.0__create_view_TAB1_to_schema1.sql. Practically: └── sql ├── sql_common │ ├── V0.0 __.... sql │ └── V1.0__create_table_TAB1.sql ├── sql_customer1 │ └── V1.0__create_view_TAB1_to_schema1.sql └── sql_customer2 └── V1.0__create_view_TAB1_to_schema2

问题 I'm trying to use flyway, but I have a scenario that does not know how to resolve: When I apply the STANDARD scripts, I have to run V1.0__create_table_TAB1.sql When I apply the scripts to customer1, the TAB1 table is a view, and so I have to run V1.0__create_view_TAB1_to_schema1.sql. Practically: └── sql ├── sql_common │ ├── V0.0 __.... sql │ └── V1.0__create_table_TAB1.sql ├── sql_customer1 │ └── V1.0__create_view_TAB1_to_schema1.sql └── sql_customer2 └── V1.0__create_view_TAB1_to_schema2

问题 I'm trying to use flyway, but I have a scenario that does not know how to resolve: When I apply the STANDARD scripts, I have to run V1.0__create_table_TAB1.sql When I apply the scripts to customer1, the TAB1 table is a view, and so I have to run V1.0__create_view_TAB1_to_schema1.sql. Practically: └── sql ├── sql_common │ ├── V0.0 __.... sql │ └── V1.0__create_table_TAB1.sql ├── sql_customer1 │ └── V1.0__create_view_TAB1_to_schema1.sql └── sql_customer2 └── V1.0__create_view_TAB1_to_schema2

问题 I am trying to use bulk_insert to insert data into an existing table ( services ) in my Postgres database. How do I instantiate this table object so I can do a bulk_insert with it? I saw answers like this: Alembic bulk_insert to table with schema but I want to avoid redefining the schema again in the migration. from alembic import op import sqlalchemy as sa from sqlalchemy.dialects import postgresql def upgrade(): """Up migration.""" services = sa.MetaData().Services() op.bulk_insert(services

问题 I have a Django postgres db (v9.3.10) running on digital ocean and am trying to migrate it over to Amazon RDS (postgres v 9.4.5). The RDS is a db.m3.xlarge instance with 300GB. I've dumped the Digital Ocean db with: sudo -u postgres pg_dump -Fc -o -f /home/<user>/db.sql <dbname> And now I'm trying to migrate it over with: pg_restore -h <RDS endpoint> --clean -Fc -v -d <dbname> -U <RDS master user> /home/<user>/db.sql The only error I see is: pg_restore: [archiver (db)] Error from TOC entry

问题 I have a Django postgres db (v9.3.10) running on digital ocean and am trying to migrate it over to Amazon RDS (postgres v 9.4.5). The RDS is a db.m3.xlarge instance with 300GB. I've dumped the Digital Ocean db with: sudo -u postgres pg_dump -Fc -o -f /home/<user>/db.sql <dbname> And now I'm trying to migrate it over with: pg_restore -h <RDS endpoint> --clean -Fc -v -d <dbname> -U <RDS master user> /home/<user>/db.sql The only error I see is: pg_restore: [archiver (db)] Error from TOC entry