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