More work on SQL migrations

pkg/services/sqlstore/migrations/common.go

@@ -0,0 +1,27 @@
+package migrations
+
+import (
+	"fmt"
+
+	. "github.com/grafana/grafana/pkg/services/sqlstore/migrator"
+)
+
+func addDropAllIndicesMigrations(mg *Migrator, versionSuffix string, table Table) {
+	for _, index := range table.Indices {
+		migrationId := fmt.Sprintf("drop index %s - %s", index.XName(table.Name), versionSuffix)
+		mg.AddMigration(migrationId, NewDropIndexMigration(table, index))
+	}
+}
+
+func addTableIndicesMigrations(mg *Migrator, versionSuffix string, table Table) {
+	for _, index := range table.Indices {
+		migration := NewAddIndexMigration(table, index)
+		migrationId := fmt.Sprintf("create index %s - %s", index.XName(table.Name), versionSuffix)
+		mg.AddMigration(migrationId, migration)
+	}
+}
+
+func addTableRenameMigration(mg *Migrator, oldName string, newName string, versionSuffix string) {
+	migrationId := fmt.Sprintf("Rename table %s to %s - %s", oldName, newName, versionSuffix)
+	mg.AddMigration(migrationId, NewRenameTableMigration(oldName, newName))
+}