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sqlscan.go
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package sqlscan
import (
"context"
"database/sql"
"errors"
"fmt"
"github.com/georgysavva/scany/v2/dbscan"
)
// Querier is something that sqlscan can query and get the *sql.Rows from.
// For example, it can be: *sql.DB, *sql.Conn or *sql.Tx.
type Querier interface {
QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error)
}
var (
_ Querier = &sql.DB{}
_ Querier = &sql.Conn{}
_ Querier = &sql.Tx{}
)
// Select is a package-level helper function that uses the DefaultAPI object.
// See API.Select for details.
func Select(ctx context.Context, db Querier, dst interface{}, query string, args ...interface{}) error {
return DefaultAPI.Select(ctx, db, dst, query, args...)
}
// Get is a package-level helper function that uses the DefaultAPI object.
// See API.Get for details.
func Get(ctx context.Context, db Querier, dst interface{}, query string, args ...interface{}) error {
return DefaultAPI.Get(ctx, db, dst, query, args...)
}
// ScanAll is a package-level helper function that uses the DefaultAPI object.
// See API.ScanAll for details.
func ScanAll(dst interface{}, rows *sql.Rows) error {
return DefaultAPI.ScanAll(dst, rows)
}
// ScanOne is a package-level helper function that uses the DefaultAPI object.
// See API.ScanOne for details.
func ScanOne(dst interface{}, rows *sql.Rows) error {
return DefaultAPI.ScanOne(dst, rows)
}
// ScanAllSets is a package-level helper function that uses the DefaultAPI object.
// See API.ScanAllSets for details.
func ScanAllSets(dsts []interface{}, rows *sql.Rows) error {
return DefaultAPI.ScanAllSets(dsts, rows)
}
// RowScanner is a wrapper around the dbscan.RowScanner type.
// See dbscan.RowScanner for details.
type RowScanner struct {
*dbscan.RowScanner
}
// NewRowScanner is a package-level helper function that uses the DefaultAPI object.
// See API.NewRowScanner for details.
func NewRowScanner(rows *sql.Rows) *RowScanner {
return DefaultAPI.NewRowScanner(rows)
}
// ScanRow is a package-level helper function that uses the DefaultAPI object.
// See API.ScanRow for details.
func ScanRow(dst interface{}, rows *sql.Rows) error {
return DefaultAPI.ScanRow(dst, rows)
}
// NewDBScanAPI creates a new dbscan API object with default configuration settings for sqlscan.
func NewDBScanAPI(opts ...dbscan.APIOption) (*dbscan.API, error) {
defaultOpts := []dbscan.APIOption{
dbscan.WithScannableTypes(
(*sql.Scanner)(nil),
),
}
opts = append(defaultOpts, opts...)
api, err := dbscan.NewAPI(opts...)
return api, err
}
// API is a wrapper around the dbscan.API type.
// See dbscan.API for details.
type API struct {
dbscanAPI *dbscan.API
}
// NewAPI creates new API instance from dbscan.API instance.
func NewAPI(dbscanAPI *dbscan.API) (*API, error) {
api := &API{dbscanAPI: dbscanAPI}
return api, nil
}
// Select is a high-level function that queries rows from Querier and calls the ScanAll function.
// See ScanAll for details.
func (api *API) Select(ctx context.Context, db Querier, dst interface{}, query string, args ...interface{}) error {
rows, err := db.QueryContext(ctx, query, args...)
if err != nil {
return fmt.Errorf("scany: query multiple result rows: %w", err)
}
if err := api.ScanAll(dst, rows); err != nil {
return fmt.Errorf("scanning all: %w", err)
}
return nil
}
// Get is a high-level function that queries rows from Querier and calls the ScanOne function.
// See ScanOne for details.
func (api *API) Get(ctx context.Context, db Querier, dst interface{}, query string, args ...interface{}) error {
rows, err := db.QueryContext(ctx, query, args...)
if err != nil {
return fmt.Errorf("scany: query one result row: %w", err)
}
if err := api.ScanOne(dst, rows); err != nil {
return fmt.Errorf("scanning one: %w", err)
}
return nil
}
// ScanAll is a wrapper around the dbscan.ScanAll function.
// See dbscan.ScanAll for details.
func (api *API) ScanAll(dst interface{}, rows *sql.Rows) error {
return api.dbscanAPI.ScanAll(dst, rows)
}
// ScanOne is a wrapper around the dbscan.ScanOne function.
// See dbscan.ScanOne for details. If no rows are found it
// returns an sql.ErrNoRows error.
func (api *API) ScanOne(dst interface{}, rows *sql.Rows) error {
switch err := api.dbscanAPI.ScanOne(dst, rows); {
case dbscan.NotFound(err):
return fmt.Errorf("%w", sql.ErrNoRows)
case err != nil:
return fmt.Errorf("%w", err)
default:
return nil
}
}
// ScanAllSets is a wrapper around the dbscan.ScanAllSets function.
// See dbscan.ScanAllSets for details.
func (api *API) ScanAllSets(dsts []interface{}, rows *sql.Rows) error {
return api.dbscanAPI.ScanAllSets(dsts, rows)
}
// NotFound is a helper function to check if an error
// is `sql.ErrNoRows`.
func NotFound(err error) bool {
return errors.Is(err, sql.ErrNoRows)
}
// NewRowScanner returns a new RowScanner instance.
func (api *API) NewRowScanner(rows *sql.Rows) *RowScanner {
return &RowScanner{RowScanner: api.dbscanAPI.NewRowScanner(rows)}
}
// ScanRow is a wrapper around the dbscan.ScanRow function.
// See dbscan.ScanRow for details.
func (api *API) ScanRow(dst interface{}, rows *sql.Rows) error {
return api.dbscanAPI.ScanRow(dst, rows)
}
func mustNewDBScanAPI(opts ...dbscan.APIOption) *dbscan.API {
api, err := NewDBScanAPI(opts...)
if err != nil {
panic(err)
}
return api
}
func mustNewAPI(dbscanAPI *dbscan.API) *API {
api, err := NewAPI(dbscanAPI)
if err != nil {
panic(err)
}
return api
}
// DefaultAPI is the default instance of API with all configuration settings set to default.
var DefaultAPI = mustNewAPI(mustNewDBScanAPI())