initial

driver/mysql/README.md

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+# MySQL Driver
+
+* Runs migrations in transcations.
+  That means that if a migration failes, it will be safely rolled back.
+* Tries to return helpful error messages.
+* Stores migration version details in table ``schema_migrations``.
+  This table will be auto-generated.
+
+
+## Usage
+
+```bash
+migrate -url postgres://user@host:port/database -path ./db/migrations create add_field_to_table
+migrate -url postgres://user@host:port/database -path ./db/migrations up
+migrate help # for more info
+```
+
+## Authors
+
+* Matthias Kadenbach, https://github.com/mattes

driver/mysql/mysql.go

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+// Package postgres implements the Driver interface.
+package postgres
+
+import (
+	"database/sql"
+	"errors"
+	"fmt"
+	"github.com/lib/pq"
+	"github.com/mattes/migrate/file"
+	"github.com/mattes/migrate/migrate/direction"
+	"strconv"
+)
+
+type Driver struct {
+	db *sql.DB
+}
+
+const tableName = "schema_migrations"
+
+func (driver *Driver) Initialize(url string) error {
+	db, err := sql.Open("postgres", url)
+	if err != nil {
+		return err
+	}
+	if err := db.Ping(); err != nil {
+		return err
+	}
+	driver.db = db
+
+	if err := driver.ensureVersionTableExists(); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (driver *Driver) Close() error {
+	if err := driver.db.Close(); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (driver *Driver) ensureVersionTableExists() error {
+	if _, err := driver.db.Exec("CREATE TABLE IF NOT EXISTS " + tableName + " (version int not null primary key);"); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (driver *Driver) FilenameExtension() string {
+	return "sql"
+}
+
+func (driver *Driver) Migrate(f file.File, pipe chan interface{}) {
+	defer close(pipe)
+	pipe <- f
+
+	tx, err := driver.db.Begin()
+	if err != nil {
+		pipe <- err
+		return
+	}
+
+	if f.Direction == direction.Up {
+		if _, err := tx.Exec("INSERT INTO "+tableName+" (version) VALUES ($1)", f.Version); err != nil {
+			pipe <- err
+			if err := tx.Rollback(); err != nil {
+				pipe <- err
+			}
+			return
+		}
+	} else if f.Direction == direction.Down {
+		if _, err := tx.Exec("DELETE FROM "+tableName+" WHERE version=$1", f.Version); err != nil {
+			pipe <- err
+			if err := tx.Rollback(); err != nil {
+				pipe <- err
+			}
+			return
+		}
+	}
+
+	if err := f.ReadContent(); err != nil {
+		pipe <- err
+		return
+	}
+
+	if _, err := tx.Exec(string(f.Content)); err != nil {
+		pqErr := err.(*pq.Error)
+		offset, err := strconv.Atoi(pqErr.Position)
+		if err == nil && offset >= 0 {
+			lineNo, columnNo := file.LineColumnFromOffset(f.Content, offset-1)
+			errorPart := file.LinesBeforeAndAfter(f.Content, lineNo, 5, 5, true)
+			pipe <- errors.New(fmt.Sprintf("%s %v: %s in line %v, column %v:\n\n%s", pqErr.Severity, pqErr.Code, pqErr.Message, lineNo, columnNo, string(errorPart)))
+		} else {
+			pipe <- errors.New(fmt.Sprintf("%s %v: %s", pqErr.Severity, pqErr.Code, pqErr.Message))
+		}
+
+		if err := tx.Rollback(); err != nil {
+			pipe <- err
+		}
+		return
+	}
+
+	if err := tx.Commit(); err != nil {
+		pipe <- err
+		return
+	}
+}
+
+func (driver *Driver) Version() (uint64, error) {
+	var version uint64
+	err := driver.db.QueryRow("SELECT version FROM " + tableName + " ORDER BY version DESC").Scan(&version)
+	switch {
+	case err == sql.ErrNoRows:
+		return 0, nil
+	case err != nil:
+		return 0, err
+	default:
+		return version, nil
+	}
+}

driver/mysql/mysql_test.go

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+package postgres
+
+import (
+	"database/sql"
+	"github.com/mattes/migrate/file"
+	"github.com/mattes/migrate/migrate/direction"
+	pipep "github.com/mattes/migrate/pipe"
+	"testing"
+)
+
+// TestMigrate runs some additional tests on Migrate().
+// Basic testing is already done in migrate/migrate_test.go
+func TestMigrate(t *testing.T) {
+	driverUrl := "postgres://localhost/migratetest?sslmode=disable"
+
+	// prepare clean database
+	connection, err := sql.Open("postgres", driverUrl)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := connection.Exec(`
+        DROP TABLE IF EXISTS yolo;
+        DROP TABLE IF EXISTS ` + tableName + `;`); err != nil {
+		t.Fatal(err)
+	}
+
+	d := &Driver{}
+	if err := d.Initialize(driverUrl); err != nil {
+		t.Fatal(err)
+	}
+
+	files := []file.File{
+		{
+			Path:      "/foobar",
+			FileName:  "001_foobar.up.sql",
+			Version:   1,
+			Name:      "foobar",
+			Direction: direction.Up,
+			Content: []byte(`
+        CREATE TABLE yolo (
+          id serial not null primary key
+        );
+      `),
+		},
+		{
+			Path:      "/foobar",
+			FileName:  "002_foobar.down.sql",
+			Version:   1,
+			Name:      "foobar",
+			Direction: direction.Down,
+			Content: []byte(`
+        DROP TABLE yolo;
+      `),
+		},
+		{
+			Path:      "/foobar",
+			FileName:  "002_foobar.up.sql",
+			Version:   2,
+			Name:      "foobar",
+			Direction: direction.Up,
+			Content: []byte(`
+        CREATE TABLE error (
+          id THIS WILL CAUSE AN ERROR
+        )
+      `),
+		},
+	}
+
+	pipe := pipep.New()
+	go d.Migrate(files[0], pipe)
+	errs := pipep.ReadErrors(pipe)
+	if len(errs) > 0 {
+		t.Fatal(errs)
+	}
+
+	pipe = pipep.New()
+	go d.Migrate(files[1], pipe)
+	errs = pipep.ReadErrors(pipe)
+	if len(errs) > 0 {
+		t.Fatal(errs)
+	}
+
+	pipe = pipep.New()
+	go d.Migrate(files[2], pipe)
+	errs = pipep.ReadErrors(pipe)
+	if len(errs) == 0 {
+		t.Error("Expected test case to fail")
+	}
+
+	if err := d.Close(); err != nil {
+		t.Fatal(err)
+	}
+}