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migrator.go
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migrator.go
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// Package migrator is a lightweight database migrator package, pass only the *sql.DB, migrate, rollback and migration reports
package migrator
import (
"database/sql"
"fmt"
"os"
"time"
)
// Rollback rolls back last migrated items or all if count is 0
func Rollback(
db *sql.DB,
migrationProvider MigrationProvider,
migrationFilePath string,
count int,
) error {
return rollback(db, migrationProvider, migrationFilePath, count, false)
}
// Refresh runs a full rollback and migrate again
func Refresh(
db *sql.DB,
migrationProvider MigrationProvider,
migrationFilePath string,
) error {
err := rollback(db, migrationProvider, migrationFilePath, 0, true)
if err != nil {
return err
}
return Migrate(db, migrationProvider, migrationFilePath, 0)
}
// Migrate execute migrations
func Migrate(
db *sql.DB,
migrationProvider MigrationProvider,
migrationFilePath string,
count int,
) error {
m := newMigrator(db)
m.migrationFilePath = migrationFilePath
m.MigrationProvider = migrationProvider
m.MigrationProvider.SetJSONFilePath(migrationFilePath)
m.MigrationProvider.ResetDate()
fileNames, err := m.orderedMigrationFiles()
if err != nil {
return err
}
migrateCount := 0
for _, fileName := range fileNames {
if count > 0 {
if migrateCount == count {
break
}
}
migrated, err := m.executeSQLFile(fileName)
if err != nil {
return err
}
if migrated {
migrateCount++
}
}
fmt.Printf("Migrated %d items\n", migrateCount)
return nil
}
// Report return a report of the alredy executed migrations
func Report(
db *sql.DB,
migrationProvider MigrationProvider,
migrationFilePath string,
) (string, error) {
m := newMigrator(db)
m.migrationFilePath = migrationFilePath
m.MigrationProvider = migrationProvider
m.MigrationProvider.SetJSONFilePath(migrationFilePath)
return m.MigrationProvider.Report()
}
// AddNewMigrationFiles adds a new blank migration file and a rollback file
func AddNewMigrationFiles(migrationFilePath, customText string) error {
var err error
err = createNewMigrationFiles(migrationFilePath, customText, false)
if err != nil {
return err
}
err = createNewMigrationFiles(migrationFilePath, customText, true)
if err != nil {
return err
}
return nil
}
func rollback(
db *sql.DB,
migrationProvider MigrationProvider,
migrationFilePath string,
count int,
isCompleteRollback bool,
) error {
var err error
m := newMigrator(db)
m.migrationFilePath = migrationFilePath
m.MigrationProvider = migrationProvider
m.MigrationProvider.SetJSONFilePath(migrationFilePath)
migrations, err := m.MigrationProvider.Migrations(!isCompleteRollback)
if err != nil {
return err
}
if len(migrations) == 0 {
fmt.Println("Nothing to rollback")
return nil
}
rollbackCount := 0
for _, fileName := range migrations {
if count > 0 {
if rollbackCount == count {
break
}
}
err = m.executeRollbackSQLFile(fileName)
if err != nil {
return err
}
rollbackCount++
}
fmt.Printf("Rolled back %d items\n", rollbackCount)
return nil
}
func createNewMigrationFiles(migrationFilePath, customText string, isRollback bool) error {
alteredCustomText := customText
mgType := "migrate"
if customText != "" {
alteredCustomText = "-" + customText
}
if isRollback {
mgType = typeRollback
}
fileName := fmt.Sprintf(
"%s-%s%s.sql",
time.Now().Format("2006-01-02_15_04_05"),
mgType,
alteredCustomText,
)
filePath := migrationFilePath + "/" + fileName
file, err := os.Create(filePath)
if err != nil {
return err
}
defer file.Close()
fmt.Printf("Migration file %s created\n", filePath)
return nil
}
func fileExists(filename string) bool {
_, err := os.Stat(filename)
return !os.IsNotExist(err)
}