migration

package
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Published: May 30, 2021 License: Apache-2.0 Imports: 6 Imported by: 0

Documentation

Overview

Package migration provides tools for database schema migrations.

The usual problems regarding downtime are not solved. Use vitess or the other tools.

https://github.com/golang-migrate/migrate

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func Run

func Run() error

Run has the idea of gathering all eligible .sql files in the folder `_dbmigrate` and put them in a zip and execute that zip file with this program on the server. Alternatively this program reads the .sql files from the go-bindata archive so that you only need to deploy one runable file.

func ToUTF8MB4

func ToUTF8MB4(ctx context.Context, db interface {
	dml.Querier
	dml.Execer
	dml.Preparer
}) error

ToUTF8MB4 converts MySQL compatible databases from utf8 to utf8mb4. What’s the difference between utf8 and utf8mb4? MySQL decided that UTF-8 can only hold 3 bytes per character. Why? No good reason can be found documented anywhere. Few years later, when MySQL 5.5.3 was released, they introduced a new encoding called utf8mb4, which is actually the real 4-byte utf8 encoding that you know and love.

# Run this once on each schema you have (Replace database_name with your schema name) ALTER DATABASE database_name CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci;

# Run this once for each table you have (replace table_name with the table name) ALTER TABLE table_name CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

# Run this for each column (replace table name, column_name, the column type, maximum length, etc.) ALTER TABLE table_name CHANGE column_name column_name VARCHAR(191) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

Types

This section is empty.

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