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singleton.go
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singleton.go
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// Copyright (c) 2021 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package sqldriver
import (
"context"
"database/sql"
"github.com/jmoiron/sqlx"
)
type (
// singleton is the driver querying a single SQL database, which is the default driver
singleton struct {
db *sqlx.DB // this is for starting a transaction, or executing any non transaction query
tx *sqlx.Tx // this is a reference of a started transaction
useTx bool // if tx is not nil, the methods from commonOfDbAndTx should use tx
}
)
// newSingletonSQLDriver returns a driver querying a single SQL database, which is the default driver
// typically dbShardID is needed when tx is not nil, because it means a started transaction in a shard.
// But this singleton doesn't have sharding so omitting it.
func newSingletonSQLDriver(xdb *sqlx.DB, xtx *sqlx.Tx, _ int) Driver {
driver := &singleton{
db: xdb,
tx: xtx,
}
if xtx != nil {
driver.useTx = true
}
return driver
}
// below are shared by transactional and non-transactional, if s.tx is not nil then use s.tx, otherwise use s.db
func (s *singleton) ExecContext(ctx context.Context, _ int, query string, args ...interface{}) (sql.Result, error) {
if s.useTx {
return s.tx.ExecContext(ctx, query, args...)
}
return s.db.ExecContext(ctx, query, args...)
}
func (s *singleton) NamedExecContext(ctx context.Context, _ int, query string, arg interface{}) (sql.Result, error) {
if s.useTx {
return s.tx.NamedExecContext(ctx, query, arg)
}
return s.db.NamedExecContext(ctx, query, arg)
}
func (s *singleton) GetContext(ctx context.Context, _ int, dest interface{}, query string, args ...interface{}) error {
if s.useTx {
return s.tx.GetContext(ctx, dest, query, args...)
}
return s.db.GetContext(ctx, dest, query, args...)
}
func (s *singleton) SelectContext(ctx context.Context, _ int, dest interface{}, query string, args ...interface{}) error {
if s.useTx {
return s.tx.SelectContext(ctx, dest, query, args...)
}
return s.db.SelectContext(ctx, dest, query, args...)
}
// below are non-transactional methods only
func (s *singleton) ExecDDL(ctx context.Context, _ int, query string, args ...interface{}) (sql.Result, error) {
return s.db.ExecContext(ctx, query, args...)
}
func (s *singleton) SelectForSchemaQuery(_ int, dest interface{}, query string, args ...interface{}) error {
return s.db.Select(dest, query, args...)
}
func (s *singleton) GetForSchemaQuery(_ int, dest interface{}, query string, args ...interface{}) error {
return s.db.Get(dest, query, args...)
}
func (s *singleton) BeginTxx(ctx context.Context, _ int, opts *sql.TxOptions) (*sqlx.Tx, error) {
return s.db.BeginTxx(ctx, opts)
}
func (s *singleton) Close() error {
return s.db.Close()
}
// below are transactional methods only
func (s *singleton) Commit() error {
return s.tx.Commit()
}
func (s *singleton) Rollback() error {
return s.tx.Rollback()
}