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ydb-go-sdk - pure Go native and database/sql driver for YDB

Supports discovery, operation, table, query, coordination, ratelimiter, scheme, scripting and topic clients for YDB. YDB is an open-source Distributed SQL Database that combines high availability and scalability with strict consistency and ACID transactions. YDB was created primarily for OLTP workloads and supports some OLAP scenarious.

Supported Go Versions

ydb-go-sdk supports all Go versions supported by the official Go Release Policy. That is, the latest two versions of Go (or more, but with no guarantees for extra versions).

Versioning Policy

ydb-go-sdk comply to guidelines from SemVer2.0.0 with an several exceptions.

Installation

go get -u github.com/ydb-platform/ydb-go-sdk/v3

Example Usage <a name="example"></a>

• connect to YDB

db, err := ydb.Open(ctx, "grpc://localhost:2136/local")
if err != nil {
    log.Fatal(err)
}

• execute SELECT query with Query service client

// Do retry operation on errors with best effort
err := db.Query().Do( // Do retry operation on errors with best effort
   ctx, // context manage exiting from Do
   func(ctx context.Context, s query.Session) (err error) { // retry operation
   	streamResult, err := s.Query(ctx, `SELECT 42 as id, "myStr" as myStr;`))
   	if err != nil {
   		return err // for auto-retry with driver
   	}
   	defer func() { _ = streamResult.Close(ctx) }() // cleanup resources
   	for s, err := range streamResult.ResultSets(ctx) {
   		if err != nil {
   			return err
   		}
   		for row, err := range rs.Rows(ctx) {
   			if err != nil {
   				return err
   			}
   			type myStruct struct {
   				id  uint64 `sql:"id"`
   				str string `sql:"myStr"`
   			}
   			var s myStruct
   			if err = row.ScanStruct(&s); err != nil {
   				return err // generally scan error not retryable, return it for driver check error
   			}
   		}
   	}

   	return nil
   },
   query.WithIdempotent(),
)
if err != nil {
   log.Fatal(err)
}

• usage with database/sql (see additional docs in SQL.md )

import (
    "context"
    "database/sql"
    "log"

    _ "github.com/ydb-platform/ydb-go-sdk/v3"
)

...

db, err := sql.Open("ydb", "grpc://localhost:2136/local")
if err != nil {
    log.Fatal(err)
}
defer db.Close() // cleanup resources
var (
    id    int32
    myStr string
)
row := db.QueryRowContext(context.TODO(), `SELECT 42 as id, "my string" as myStr`)
if err = row.Scan(&id, &myStr); err != nil {
    log.Printf("select failed: %v", err)
    return
}
log.Printf("id = %d, myStr = \"%s\"", id, myStr)

More examples of usage placed in examples directory.

Credentials <a name="credentials"></a>

Driver implements several ways for making credentials for YDB:

• ydb.WithAnonymousCredentials() (enabled by default unless otherwise specified)
• ydb.WithAccessTokenCredentials("token")
• ydb.WithStaticCredentials("user", "password"),
• ydb.WithOauth2TokenExchangeCredentials() and ydb,WithOauth2TokenExchangeCredentialsFile(configFilePath)
• as part of connection string, like as grpcs://user:password@endpoint/database

Another variants of credentials.Credentials object provides with external packages:

Ecosystem of debug tools over ydb-go-sdk <a name="debug"></a>

Package ydb-go-sdk provide debugging over trace events in package trace. Next packages provide debug tooling:

Environment variables <a name="environ"></a>

ydb-go-sdk supports next environment variables which redefines default behavior of driver