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102 lines
3.5 KiB
Go
102 lines
3.5 KiB
Go
// Package mymigrate implements sqlmigrate.Migrator for MySQL and MariaDB
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// using database/sql with github.com/go-sql-driver/mysql.
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//
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// The *sql.DB must be opened with multiStatements=true in the DSN;
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// without it, multi-statement migration files will fail. New returns
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// an error if multi-statement support is not detected:
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//
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// db, err := sql.Open("mysql", "user:pass@tcp(host:3306)/dbname?multiStatements=true")
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//
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// MySQL and MariaDB do not support transactional DDL. Statements like
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// CREATE TABLE and ALTER TABLE cause an implicit commit, so if a migration
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// fails partway through, earlier DDL statements in that migration will
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// already be committed. DML-only migrations are fully transactional.
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package mymigrate
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import (
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"context"
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"database/sql"
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"errors"
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"fmt"
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"github.com/go-sql-driver/mysql"
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"github.com/therootcompany/golib/database/sqlmigrate"
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)
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// Migrator implements sqlmigrate.Migrator using a *sql.DB with MySQL/MariaDB.
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type Migrator struct {
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DB *sql.DB
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}
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// New creates a Migrator from the given database handle.
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// Returns an error if the connection does not support multi-statement
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// queries (multiStatements=true must be set in the DSN).
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func New(db *sql.DB) (*Migrator, error) {
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// Probe for multi-statement support. Without it, migration files
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// that contain more than one statement silently execute only the first.
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if _, err := db.Exec("DO 1; DO 1"); err != nil {
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return nil, fmt.Errorf("mymigrate: connection requires multiStatements=true in DSN: %w", err)
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}
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return &Migrator{DB: db}, nil
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}
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var _ sqlmigrate.Migrator = (*Migrator)(nil)
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// ExecUp runs the up migration SQL in a transaction. DDL statements
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// (CREATE, ALTER, DROP) are implicitly committed by MySQL; see package docs.
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func (m *Migrator) ExecUp(ctx context.Context, mig sqlmigrate.Migration) error {
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return m.exec(ctx, mig.Up)
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}
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// ExecDown runs the down migration SQL in a transaction. DDL statements
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// (CREATE, ALTER, DROP) are implicitly committed by MySQL; see package docs.
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func (m *Migrator) ExecDown(ctx context.Context, mig sqlmigrate.Migration) error {
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return m.exec(ctx, mig.Down)
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}
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func (m *Migrator) exec(ctx context.Context, sqlStr string) error {
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tx, err := m.DB.BeginTx(ctx, nil)
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if err != nil {
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return fmt.Errorf("%w: begin: %w", sqlmigrate.ErrExecFailed, err)
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}
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defer tx.Rollback() //nolint:errcheck
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if _, err := tx.ExecContext(ctx, sqlStr); err != nil {
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return fmt.Errorf("%w: exec: %w", sqlmigrate.ErrExecFailed, err)
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}
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if err := tx.Commit(); err != nil {
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return fmt.Errorf("%w: commit: %w", sqlmigrate.ErrExecFailed, err)
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}
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return nil
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}
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// Applied returns all applied migrations from the _migrations table.
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// Returns an empty slice if the table does not exist (MySQL error 1146).
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func (m *Migrator) Applied(ctx context.Context) ([]sqlmigrate.AppliedMigration, error) {
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rows, err := m.DB.QueryContext(ctx, "SELECT id, name FROM _migrations ORDER BY name")
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if err != nil {
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if mysqlErr, ok := errors.AsType[*mysql.MySQLError](err); ok && mysqlErr.Number == 1146 {
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return nil, nil
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}
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return nil, fmt.Errorf("%w: %w", sqlmigrate.ErrQueryApplied, err)
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}
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defer rows.Close()
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var applied []sqlmigrate.AppliedMigration
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for rows.Next() {
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var a sqlmigrate.AppliedMigration
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if err := rows.Scan(&a.ID, &a.Name); err != nil {
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return nil, fmt.Errorf("%w: scanning row: %w", sqlmigrate.ErrQueryApplied, err)
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}
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applied = append(applied, a)
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}
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if err := rows.Err(); err != nil {
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return nil, fmt.Errorf("%w: reading rows: %w", sqlmigrate.ErrQueryApplied, err)
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}
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return applied, nil
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}
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