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Code Issues Releases Activity

get latest migration from database

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This commit is contained in:
ZhengYang 2014-08-12 10:33:25 +08:00
parent 6f4c1b3a89
commit 870698f5a4
1 changed files with 47 additions and 17 deletions
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64
migrate.go
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@ -83,13 +83,7 @@ func runMigration(cmd *Command, args []string) {
}
}
func checkForSchemaUpdateTable(driver string, connStr string) {
db, err := sql.Open(driver, connStr)
if err != nil {
ColorLog("[ERRO] Could not connect to %s: %s\n", driver, connStr)
os.Exit(2)
}
defer db.Close()
func checkForSchemaUpdateTable(db *sql.DB) {
if rows, err := db.Query("SHOW TABLES LIKE 'migrations'"); err != nil {
ColorLog("[ERRO] Could not show migrations table: %s\n", err)
os.Exit(2)
@ -138,6 +132,26 @@ func checkForSchemaUpdateTable(driver string, connStr string) {
}
}
func getLatestMigration(db *sql.DB) (file string, createdAt string) {
sql := "SELECT file, created_at FROM migrations ORDER BY id_migration DESC LIMIT 1"
if rows, err := db.Query(sql); err != nil {
ColorLog("[ERRO] Could not retrieve migrations: %s\n", err)
os.Exit(2)
} else {
var fileBytes, createdAtBytes []byte
if rows.Next() {
if err := rows.Scan(&fileBytes, &createdAtBytes); err != nil {
ColorLog("[ERRO] Could not read migrations in database: %s\n", err)
os.Exit(2)
}
file, createdAt = string(fileBytes), string(createdAtBytes)
} else {
file, createdAt = "", "0"
}
}
return
}
func createTempMigrationDir(path string) {
if err := os.MkdirAll(path, 0777); err != nil {
ColorLog("[ERRO] Could not create path: %s\n", err)
@ -145,14 +159,16 @@ func createTempMigrationDir(path string) {
}
}
func writeMigrationSourceFile(filename string, driver string, connStr string) {
func writeMigrationSourceFile(filename string, driver string, connStr string, latestTime string, latestName string, task string) {
if f, err := os.OpenFile(filename+".go", os.O_CREATE|os.O_EXCL|os.O_RDWR, 0666); err != nil {
ColorLog("[ERRO] Could not create file: %s\n", err)
os.Exit(2)
} else {
content := strings.Replace(MIGRATION_MAIN_TPL, "{{DBDriver}}", driver, -1)
content = strings.Replace(content, "{{ConnStr}}", connStr, -1)
content = strings.Replace(content, "{{CurrTime}}", "123", -1)
content = strings.Replace(content, "{{LatestTime}}", latestTime, -1)
content = strings.Replace(content, "{{LatestName}}", latestName, -1)
content = strings.Replace(content, "{{Task}}", task, -1)
if _, err := f.WriteString(content); err != nil {
ColorLog("[ERRO] Could not write to file: %s\n", err)
os.Exit(2)
@ -188,10 +204,19 @@ func cleanUpMigrationFiles(tmpPath string) {
func migrateUpdate() {
connStr := "root:@tcp(127.0.0.1:3306)/sgfas?charset=utf8"
checkForSchemaUpdateTable("mysql", connStr)
driver := "mysql"
filename := path.Join(TMP_DIR, "super")
// connect to database
db, err := sql.Open(driver, connStr)
if err != nil {
ColorLog("[ERRO] Could not connect to %s: %s\n", driver, connStr)
os.Exit(2)
}
defer db.Close()
checkForSchemaUpdateTable(db)
latestTime, latestName := getLatestMigration(db)
createTempMigrationDir(TMP_DIR)
writeMigrationSourceFile(filename, "mysql", connStr)
writeMigrationSourceFile(filename, driver, connStr, latestTime, latestName, "upgrade")
buildMigrationBinary(filename)
runMigrationBinary(filename)
cleanUpMigrationFiles(TMP_DIR)
@ -204,8 +229,6 @@ func migrateReset() {
}
func migrateRefresh() {
migrateReset()
migrateUpdate()
}
const (
@ -221,10 +244,17 @@ func init(){
}
func main(){
migration.Upgrade({{CurrTime}})
//migration.Rollback()
//migration.Reset()
//migration.Refresh()
task := {{Task}}
switch task {
case "upgrade":
migration.Upgrade({{LatestTime}})
case "rollback":
migration.Rollback("{{LatestName}}")
case "reset":
migration.Reset()
case "refresh":
migration.Refresh()
}
}
`