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Support non-PostgreSQL databases

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This commit is contained in:
Nise Void 2019-11-12 13:01:36 +01:00
parent de9e7d9a41
commit f39c1c640a
Signed by: NiseVoid
GPG key ID: FBA14AC83EA602F3
3 changed files with 86 additions and 16 deletions
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38
migrate.go
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@ -11,7 +11,7 @@ import (
// Options contains all settings
type Options struct {
TableName string // Name used for version info table; defaults to DefaultTableName if not set
Schema string // Schema used for version info table; For PostgreSQL, ignored if not set
Schema string // Schema used for version info table; In PostgreSQL the current schema is changed to the one specified here
AssetPrefix string
}
@ -29,23 +29,13 @@ type AssetFunc func(string) ([]byte, error)
// Migrate executes migrations to get to the desired version
// Downgrading is not supported as it could result in data loss
func Migrate(db *sql.DB, version int, o Options, asset AssetFunc) error {
dbType := getDbType(db)
if o.TableName == `` {
o.TableName = DefaultTableName
}
var err error
searchPath := `public`
_ = db.QueryRow(`SHOW search_path`).Scan(&searchPath)
if o.Schema != `` {
_, _ = db.Exec(`CREATE SCHEMA IF NOT EXISTS ` + o.Schema)
_, err = db.Exec(`SET search_path TO ` + o.Schema)
if err != nil {
return err
}
}
tx, err := db.Begin()
if err != nil {
@ -53,12 +43,28 @@ func Migrate(db *sql.DB, version int, o Options, asset AssetFunc) error {
}
defer tx.Rollback()
_, err = tx.Exec(`CREATE TABLE IF NOT EXISTS ` + o.TableName + ` (Version integer NOT NULL PRIMARY KEY)`)
if o.Schema != `` {
err = createSchemaIfNotExists(tx, o.Schema)
if err != nil {
return err
}
if dbType == `pq` {
_ = tx.QueryRow(`SHOW search_path`).Scan(&searchPath)
_, err = tx.Exec(`SET search_path TO ` + o.Schema)
if err != nil {
return err
}
}
}
versionTable, err := createTableIfNotExists(tx, o.Schema, o.TableName)
if err != nil {
return err
}
row := tx.QueryRow(`SELECT Version FROM ` + o.TableName + ` ORDER BY Version DESC`)
row := tx.QueryRow(`SELECT version FROM ` + versionTable + ` ORDER BY Version DESC`)
var v int
err = row.Scan(&v)
@ -80,13 +86,13 @@ func Migrate(db *sql.DB, version int, o Options, asset AssetFunc) error {
return errorf(err)
}
_, err = tx.Exec(`INSERT INTO ` + o.TableName + ` VALUES (` + strconv.Itoa(i) + `)`)
_, err = tx.Exec(`INSERT INTO ` + versionTable + ` (version) VALUES (` + strconv.Itoa(i) + `)`)
if err != nil {
return errorf(err)
}
}
if o.Schema != `` {
if dbType == `pq` && o.Schema != `` {
_, err = tx.Exec(`SET search_path TO ` + searchPath)
if err != nil {
return err