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sqler.go
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sqler.go
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// Copyright 2019 Anapaya Systems
//
// 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 (
"context"
"database/sql"
)
var _ Sqler = (*sql.DB)(nil)
var _ Sqler = (*sql.Tx)(nil)
// Sqler contains the common functions of *sql.DB and *sql.Tx.
type Sqler interface {
ExecContext(context.Context, string, ...interface{}) (sql.Result, error)
QueryContext(context.Context, string, ...interface{}) (*sql.Rows, error)
QueryRowContext(context.Context, string, ...interface{}) *sql.Row
}
// DoInTx executes the given action in a transaction. If db is already a transaction the action is
// executed in the existing transaction, the transaction is not modified. If db is a "normal" db, a
// transaction is created and action is executed in it. If action errors the created transaction is
// rollbacked, otherwise it is committed.
func DoInTx(ctx context.Context, db Sqler, action func(context.Context, *sql.Tx) error) error {
tx, ok := db.(*sql.Tx)
if ok {
return action(ctx, tx)
}
var err error
if tx, err = db.(*sql.DB).BeginTx(ctx, nil); err != nil {
return NewTxError("create tx", err)
}
defer tx.Rollback()
if err := action(ctx, tx); err != nil {
return err
}
if err := tx.Commit(); err != nil {
return NewTxError("commit", err)
}
return nil
}
// DeleteInTx executes delFunc in a transaction and returns the affected rows.
func DeleteInTx(ctx context.Context, db Sqler,
delFunc func(tx *sql.Tx) (sql.Result, error)) (int, error) {
var res sql.Result
err := DoInTx(ctx, db, func(ctx context.Context, tx *sql.Tx) error {
var err error
res, err = delFunc(tx)
return err
})
if err != nil {
return 0, NewWriteError("delete in tx", err)
}
deleted, _ := res.RowsAffected()
return int(deleted), nil
}