agola/internal/db/create.go

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2019-02-21 15:05:54 +00:00
// Copyright 2019 Sorint.lab
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied
// See the License for the specific language governing permissions and
// limitations under the License.
package db
import (
"database/sql"
sq "github.com/Masterminds/squirrel"
"github.com/pkg/errors"
)
const dbVersionTableDDLTmpl = `
create table if not exists dbversion (version int not null, time timestamptz not null)
`
const dbVersion = 1
func (db *DB) Create(stmts []string) error {
sb := sq.StatementBuilder.PlaceholderFormat(sq.Dollar)
err := db.Do(func(tx *Tx) error {
if _, err := tx.Exec(dbVersionTableDDLTmpl); err != nil {
return errors.Wrap(err, "failed to create dbversion table")
}
return nil
})
if err != nil {
return err
}
err = db.Do(func(tx *Tx) error {
var version sql.NullInt64
q, args, err := sb.Select("max(version)").From("dbversion").ToSql()
if err != nil {
return err
}
if err := tx.QueryRow(q, args...).Scan(&version); err != nil {
return errors.Wrap(err, "cannot get current db version")
}
if version.Valid {
return nil
}
for _, stmt := range stmts {
if _, err := tx.Exec(stmt); err != nil {
return errors.Wrapf(err, "creation failed")
}
}
q, args, err = sb.Insert("dbversion").Columns("version", "time").Values(dbVersion, "now()").ToSql()
if err != nil {
return err
}
if _, err := tx.Exec(q, args...); err != nil {
return errors.Wrap(err, "failed to update dbversion table")
}
return nil
})
return err
}