Вставка данных
Ниже приведены примеры кода использования встроенных в YDB SDK средств выполнения вставки:
Go (native)
Go (database/sql)
package main
import (
"context"
"os"
"github.com/ydb-platform/ydb-go-sdk/v3"
"github.com/ydb-platform/ydb-go-sdk/v3/table"
"github.com/ydb-platform/ydb-go-sdk/v3/table/types"
)
func main() {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
db, err := ydb.Open(ctx,
os.Getenv("YDB_CONNECTION_STRING"),
ydb.WithAccessTokenCredentials(os.Getenv("YDB_TOKEN")),
)
if err != nil {
panic(err)
}
defer db.Close(ctx)
// execute upsert with native ydb data
err = db.Table().DoTx( // Do retry operation on errors with best effort
ctx, // context manages exiting from Do
func(ctx context.Context, tx table.TransactionActor) (err error) { // retry operation
res, err := tx.Execute(ctx, `
PRAGMA TablePathPrefix("/path/to/table");
DECLARE $seriesID AS Uint64;
DECLARE $seasonID AS Uint64;
DECLARE $episodeID AS Uint64;
DECLARE $views AS Uint64;
UPSERT INTO episodes ( series_id, season_id, episode_id, views )
VALUES ( $seriesID, $seasonID, $episodeID, $views );
`,
table.NewQueryParameters(
table.ValueParam("$seriesID", types.Uint64Value(1)),
table.ValueParam("$seasonID", types.Uint64Value(1)),
table.ValueParam("$episodeID", types.Uint64Value(1)),
table.ValueParam("$views", types.Uint64Value(1)), // increment views
),
)
if err != nil {
return err
}
if err = res.Err(); err != nil {
return err
}
return res.Close()
}, table.WithIdempotent(),
)
if err != nil {
fmt.Printf("unexpected error: %v", err)
}
}
package main
import (
"context"
"database/sql"
"os"
_ "github.com/ydb-platform/ydb-go-sdk/v3"
"github.com/ydb-platform/ydb-go-sdk/v3/retry"
"github.com/ydb-platform/ydb-go-sdk/v3/types"
)
func main() {
db, err := sql.Open("ydb", os.Getenv("YDB_CONNECTION_STRING"))
if err != nil {
panic(err)
}
defer db.Close(ctx)
// execute upsert with native ydb data
err = retry.DoTx(ctx, db, func(ctx context.Context, tx *sql.Tx) error {
if _, err = tx.ExecContext(ctx,`
PRAGMA TablePathPrefix("/local");
REPLACE INTO series
SELECT
series_id,
title,
series_info,
comment
FROM AS_TABLE($seriesData);
`,
sql.Named("seriesData", types.ListValue(
types.StructValue(
types.StructFieldValue("series_id", types.Uint64Value(1)),
types.StructFieldValue("title", types.TextValue("IT Crowd")),
types.StructFieldValue("series_info", types.TextValue(
"The IT Crowd is a British sitcom produced by Channel 4, written by Graham Linehan, produced by "+
"Ash Atalla and starring Chris O'Dowd, Richard Ayoade, Katherine Parkinson, and Matt Berry.",
)),
types.StructFieldValue("comment", types.NullValue(types.TypeText)),
),
types.StructValue(
types.StructFieldValue("series_id", types.Uint64Value(2)),
types.StructFieldValue("title", types.TextValue("Silicon Valley")),
types.StructFieldValue("series_info", types.TextValue(
"Silicon Valley is an American comedy television series created by Mike Judge, John Altschuler and "+
"Dave Krinsky. The series focuses on five young men who founded a startup company in Silicon Valley.",
)),
types.StructFieldValue("comment", types.TextValue("lorem ipsum")),
),
)),
); err != nil {
return err
}
return nil
}, retry.WithDoTxRetryOptions(retry.WithIdempotent(true)))
if err != nil {
fmt.Printf("unexpected error: %v", err)
}
}