mirror of
https://github.com/therootcompany/golib.git
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AJ ONeal
0c1eb1f125
Index skill (use-sqlmigrate) plus focused skills for CLI usage, Go library integration, and per-database conventions (PostgreSQL, MySQL/MariaDB, SQLite, SQL Server).
65 lines
1.5 KiB
Markdown
65 lines
1.5 KiB
Markdown
---
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name: use-sql-migrate-postgres
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description: PostgreSQL migrations with sql-migrate and pgmigrate. Use when setting up PostgreSQL migrations, schema multi-tenancy, or pgx connection for migrations.
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depends: [use-sqlmigrate]
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---
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## CLI setup
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```sh
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sql-migrate -d ./sql/migrations/ init --sql-command psql
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```
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## Environment
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```sh
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# .env
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PG_URL='postgres://user:pass@localhost:5432/mydb?sslmode=disable'
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```
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## Go library
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```go
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import (
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"github.com/jackc/pgx/v5"
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"github.com/therootcompany/golib/database/sqlmigrate"
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"github.com/therootcompany/golib/database/sqlmigrate/pgmigrate"
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)
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// MUST: use pgx.Connect (single conn), not pgxpool.New
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conn, err := pgx.Connect(ctx, pgURL)
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defer func() { _ = conn.Close(ctx) }()
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runner := pgmigrate.New(conn)
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applied, err := sqlmigrate.Latest(ctx, runner, scripts)
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```
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## Schema multi-tenancy
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Each PostgreSQL schema gets its own `_migrations` table. Tenants are migrated independently.
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### CLI
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```sh
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PGOPTIONS="-c search_path=tenant123" sql-migrate -d ./sql/migrations/ up | sh
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```
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### Go library
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```go
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conn, err := pgx.Connect(ctx, pgURL)
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_, err = conn.Exec(ctx, fmt.Sprintf(
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"SET search_path TO %s",
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pgx.Identifier{schema}.Sanitize(),
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))
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runner := pgmigrate.New(conn)
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```
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## SQL dialect notes
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- `CREATE TABLE IF NOT EXISTS` works
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- `ON CONFLICT DO NOTHING` for idempotent seeds
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- String concatenation: `id || CHR(9) || name` (used by sync query)
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- Timestamps: `TIMESTAMP DEFAULT CURRENT_TIMESTAMP`
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- Error code 42P01 = table doesn't exist (handled automatically by pgmigrate)
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