table

package
v3.42.3 Latest Latest
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 Go to latest Published: Jan 11, 2023 License: Apache-2.0 Imports: 12 Imported by: 54

Documentation

Overview

Example (AlterTable) 
ctx := context.TODO()
db, err := ydb.Open(ctx, "grpcs://localhost:2135/local")
if err != nil {
	fmt.Printf("failed connect: %v", err)
	return
}
defer db.Close(ctx) // cleanup resources
err = db.Table().Do(ctx,
	func(ctx context.Context, s table.Session) (err error) {
		return s.AlterTable(ctx, path.Join(db.Name(), "series"),
			options.WithAddColumn("series_id", types.Optional(types.TypeUint64)),
			options.WithAddColumn("title", types.Optional(types.TypeText)),
			options.WithSetTimeToLiveSettings(
				options.NewTTLSettings().ColumnDateType("expire_at").ExpireAfter(time.Hour),
			),
			options.WithDropTimeToLive(),
			options.WithAddIndex("idx_series_series_id",
				options.WithIndexColumns("series_id"),
				options.WithDataColumns("title"),
				options.WithIndexType(options.GlobalAsyncIndex()),
			),
			options.WithDropIndex("idx_series_title"),
			options.WithAlterAttribute("hello", "world"),
			options.WithAddAttribute("foo", "bar"),
			options.WithDropAttribute("baz"),
		)
	},
	table.WithIdempotent(),
)
if err != nil {
	fmt.Printf("unexpected error: %v", err)
}

Output:
Example (BulkUpsert) 
ctx := context.TODO()
db, err := ydb.Open(ctx, "grpcs://localhost:2135/local")
if err != nil {
	fmt.Printf("failed connect: %v", err)
	return
}
defer db.Close(ctx) // cleanup resources
type logMessage struct {
	App       string
	Host      string
	Timestamp time.Time
	HTTPCode  uint32
	Message   string
}
// prepare native go data
const batchSize = 10000
logs := make([]logMessage, 0, batchSize)
for i := 0; i < batchSize; i++ {
	message := logMessage{
		App:       fmt.Sprintf("App_%d", i/256),
		Host:      fmt.Sprintf("192.168.0.%d", i%256),
		Timestamp: time.Now().Add(time.Millisecond * time.Duration(i%1000)),
		HTTPCode:  200,
	}
	if i%2 == 0 {
		message.Message = "GET / HTTP/1.1"
	} else {
		message.Message = "GET /images/logo.png HTTP/1.1"
	}
	logs = append(logs, message)
}
// execute bulk upsert with native ydb data
err = db.Table().Do( // Do retry operation on errors with best effort
	ctx, // context manage exiting from Do
	func(ctx context.Context, s table.Session) (err error) { // retry operation
		rows := make([]types.Value, 0, len(logs))
		for _, msg := range logs {
			rows = append(rows, types.StructValue(
				types.StructFieldValue("App", types.TextValue(msg.App)),
				types.StructFieldValue("Host", types.TextValue(msg.Host)),
				types.StructFieldValue("Timestamp", types.TimestampValueFromTime(msg.Timestamp)),
				types.StructFieldValue("HTTPCode", types.Uint32Value(msg.HTTPCode)),
				types.StructFieldValue("Message", types.TextValue(msg.Message)),
			))
		}
		return s.BulkUpsert(ctx, "/local/bulk_upsert_example", types.ListValue(rows...))
	},
	table.WithIdempotent(),
)
if err != nil {
	fmt.Printf("unexpected error: %v", err)
}

Output:
Example (CreateTable) 
ctx := context.TODO()
db, err := ydb.Open(ctx, "grpcs://localhost:2135/local")
if err != nil {
	fmt.Printf("failed connect: %v", err)
	return
}
defer db.Close(ctx) // cleanup resources
err = db.Table().Do(ctx,
	func(ctx context.Context, s table.Session) (err error) {
		return s.CreateTable(ctx, path.Join(db.Name(), "series"),
			options.WithColumn("series_id", types.Optional(types.TypeUint64)),
			options.WithColumn("title", types.Optional(types.TypeText)),
			options.WithColumn("series_info", types.Optional(types.TypeText)),
			options.WithColumn("release_date", types.Optional(types.TypeDate)),
			options.WithColumn("expire_at", types.Optional(types.TypeDate)),
			options.WithColumn("comment", types.Optional(types.TypeText)),
			options.WithPrimaryKeyColumn("series_id"),
			options.WithTimeToLiveSettings(
				options.NewTTLSettings().ColumnDateType("expire_at").ExpireAfter(time.Hour),
			),
			options.WithIndex("idx_series_title",
				options.WithIndexColumns("title"),
				options.WithIndexType(options.GlobalAsyncIndex()),
			),
		)
	},
	table.WithIdempotent(),
)
if err != nil {
	fmt.Printf("unexpected error: %v", err)
}

Output:
Example (LazyTransaction) 
ctx := context.TODO()
db, err := ydb.Open(ctx, "grpcs://localhost:2135/local")
if err != nil {
	fmt.Printf("failed connect: %v", err)
	return
}
defer db.Close(ctx)
err = db.Table().Do(ctx,
	func(ctx context.Context, session table.Session) (err error) {
		// execute query with opening lazy transaction
		tx, result, err := session.Execute(ctx,
			table.SerializableReadWriteTxControl(),
			"DECLARE $id AS Uint64; "+
				"SELECT `title`, `description` FROM `path/to/mytable` WHERE id = $id",
			table.NewQueryParameters(
				table.ValueParam("$id", types.Uint64Value(1)),
			),
		)
		if err != nil {
			return err
		}
		defer func() {
			_ = tx.Rollback(ctx)
			_ = result.Close()
		}()
		if !result.NextResultSet(ctx) {
			return retry.RetryableError(fmt.Errorf("no result sets"))
		}
		if !result.NextRow() {
			return retry.RetryableError(fmt.Errorf("no rows"))
		}
		var (
			id          uint64
			title       string
			description string
		)
		if err = result.ScanNamed(
			named.OptionalWithDefault("id", &id),
			named.OptionalWithDefault("title", &title),
			named.OptionalWithDefault("description", &description),
		); err != nil {
			return err
		}
		fmt.Println(id, title, description)
		// execute query with commit transaction
		_, err = tx.Execute(ctx,
			"DECLARE $id AS Uint64; "+
				"DECLARE $description AS Text; "+
				"UPSERT INTO `path/to/mytable` "+
				"(id, description) "+
				"VALUES ($id, $description);",
			table.NewQueryParameters(
				table.ValueParam("$id", types.Uint64Value(1)),
				table.ValueParam("$description", types.TextValue("changed description")),
			),
			options.WithCommit(),
		)
		if err != nil {
			return err
		}
		return result.Err()
	},
	table.WithIdempotent(),
)
if err != nil {
	fmt.Printf("unexpected error: %v", err)
}

Output:
Example (Select) 
ctx := context.TODO()
db, err := ydb.Open(ctx, "grpcs://localhost:2135/local")
if err != nil {
	fmt.Printf("failed connect: %v", err)
	return
}
defer db.Close(ctx) // cleanup resources
var (
	query = `SELECT 42 as id, "my string" as myStr`
	id    int32  // required value
	myStr string // optional value
)
err = db.Table().Do( // Do retry operation on errors with best effort
	ctx, // context manage exiting from Do
	func(ctx context.Context, s table.Session) (err error) { // retry operation
		_, res, err := s.Execute(ctx, table.DefaultTxControl(), query, nil)
		if err != nil {
			return err // for auto-retry with driver
		}
		defer res.Close()                                // cleanup resources
		if err = res.NextResultSetErr(ctx); err != nil { // check single result set and switch to it
			return err // for auto-retry with driver
		}
		for res.NextRow() { // iterate over rows
			err = res.ScanNamed(
				named.Required("id", &id),
				named.OptionalWithDefault("myStr", &myStr),
			)
			if err != nil {
				return err // generally scan error not retryable, return it for driver check error
			}
			fmt.Printf("id=%v, myStr='%s'\n", id, myStr)
		}
		return res.Err() // return finally result error for auto-retry with driver
	},
	table.WithIdempotent(),
)
if err != nil {
	fmt.Printf("unexpected error: %v", err)
}

Output:

Index

Examples

Constants

View Source 
const (
	SessionStatusUnknown = SessionStatus("unknown")
	SessionReady         = SessionStatus("ready")
	SessionBusy          = SessionStatus("busy")
	SessionClosing       = SessionStatus("closing")
	SessionClosed        = SessionStatus("closed")
)

Variables

This section is empty.

Functions

This section is empty.

Types

type Client 

type Client interface {
	// CreateSession returns session or error for manually control of session lifecycle
	//
	// CreateSession implements internal busy loop until one of the following conditions is met:
	// - context was canceled or deadlined
	// - session was created
	//
	// Deprecated: don't use CreateSession explicitly. This method only for ORM's compatibility.
	// Use Do for queries with session
	CreateSession(ctx context.Context, opts ...Option) (s ClosableSession, err error)

	// Do provide the best effort for execute operation.
	//
	// Do implements internal busy loop until one of the following conditions is met:
	// - deadline was canceled or deadlined
	// - retry operation returned nil as error
	//
	// Warning: if context without deadline or cancellation func than Do can run indefinitely.
	Do(ctx context.Context, op Operation, opts ...Option) error

	// DoTx provide the best effort for execute transaction.
	//
	// DoTx implements internal busy loop until one of the following conditions is met:
	// - deadline was canceled or deadlined
	// - retry operation returned nil as error
	//
	// DoTx makes auto begin (with TxSettings, by default - SerializableReadWrite), commit and
	// rollback (on error) of transaction.
	//
	// If op TxOperation returns nil - transaction will be committed
	// If op TxOperation return non nil - transaction will be rollback
	// Warning: if context without deadline or cancellation func than DoTx can run indefinitely
	DoTx(ctx context.Context, op TxOperation, opts ...Option) error
}

type ClosableSession added in v3.5.0 

type ClosableSession interface {
	closer.Closer

	Session
}

type DataQuery 

type DataQuery interface {
	String() string
	ID() string
	YQL() string
}

DataQuery only for tracers

type DataQueryExplanation 

type DataQueryExplanation struct {
	Explanation

	AST string
}

DataQueryExplanation is a result of ExplainDataQuery call.

type Explanation added in v3.7.0 

type Explanation struct {
	Plan string
}

Explanation is a result of Explain calls.

type Operation added in v3.2.1 

type Operation func(ctx context.Context, s Session) error

Operation is the interface that holds an operation for retry. if Operation returns not nil - operation will retry if Operation returns nil - retry loop will break

type Option added in v3.2.1 

type Option func(o *Options)

func WithIdempotent added in v3.2.1 

func WithIdempotent() Option

func WithTrace added in v3.15.0 

func WithTrace(t trace.Table) Option

func WithTxCommitOptions added in v3.5.0 

func WithTxCommitOptions(opts ...options.CommitTransactionOption) Option

func WithTxSettings added in v3.5.0 

func WithTxSettings(tx *TransactionSettings) Option

type Options added in v3.2.1 

type Options struct {
	Idempotent      bool
	TxSettings      *TransactionSettings
	TxCommitOptions []options.CommitTransactionOption
	FastBackoff     backoff.Backoff
	SlowBackoff     backoff.Backoff
	Trace           trace.Table
}

type ParameterOption 

type ParameterOption interface {
	Name() string
	Value() types.Value
}

func ValueParam 

func ValueParam(name string, v types.Value) ParameterOption

type QueryParameters 

type QueryParameters struct {
	// contains filtered or unexported fields
}

func NewQueryParameters 

func NewQueryParameters(opts ...ParameterOption) *QueryParameters

func (*QueryParameters) Add 

func (q *QueryParameters) Add(params ...ParameterOption)

func (*QueryParameters) Each 

func (q *QueryParameters) Each(it func(name string, v types.Value))

func (*QueryParameters) Params 

func (q *QueryParameters) Params() queryParams

func (*QueryParameters) String 

func (q *QueryParameters) String() string

type ScriptingYQLExplanation added in v3.7.0 

type ScriptingYQLExplanation struct {
	Explanation

	ParameterTypes map[string]types.Type
}

ScriptingYQLExplanation is a result of Explain calls.

type Session 

type Session interface {
	SessionInfo

	CreateTable(
		ctx context.Context,
		path string,
		opts ...options.CreateTableOption,
	) (err error)

	DescribeTable(
		ctx context.Context,
		path string,
		opts ...options.DescribeTableOption,
	) (desc options.Description, err error)

	DropTable(
		ctx context.Context,
		path string,
		opts ...options.DropTableOption,
	) (err error)

	AlterTable(
		ctx context.Context,
		path string,
		opts ...options.AlterTableOption,
	) (err error)

	CopyTable(
		ctx context.Context,
		dst, src string,
		opts ...options.CopyTableOption,
	) (err error)

	Explain(
		ctx context.Context,
		query string,
	) (exp DataQueryExplanation, err error)

	// Prepare prepares query for executing in the future
	Prepare(
		ctx context.Context,
		query string,
	) (stmt Statement, err error)

	// Execute executes query.
	//
	// By default, Execute have a flag options.WithKeepInCache(true) if params is not empty. For redefine behavior -
	// append option options.WithKeepInCache(false)
	Execute(
		ctx context.Context,
		tx *TransactionControl,
		query string,
		params *QueryParameters,
		opts ...options.ExecuteDataQueryOption,
	) (txr Transaction, r result.Result, err error)

	ExecuteSchemeQuery(
		ctx context.Context,
		query string,
		opts ...options.ExecuteSchemeQueryOption,
	) (err error)

	DescribeTableOptions(
		ctx context.Context,
	) (desc options.TableOptionsDescription, err error)

	StreamReadTable(
		ctx context.Context,
		path string,
		opts ...options.ReadTableOption,
	) (r result.StreamResult, err error)

	StreamExecuteScanQuery(
		ctx context.Context,
		query string,
		params *QueryParameters,
		opts ...options.ExecuteScanQueryOption,
	) (_ result.StreamResult, err error)

	BulkUpsert(
		ctx context.Context,
		table string,
		rows types.Value,
	) (err error)

	BeginTransaction(
		ctx context.Context,
		tx *TransactionSettings,
	) (x Transaction, err error)

	KeepAlive(
		ctx context.Context,
	) error
}

type SessionInfo 

type SessionInfo interface {
	ID() string
	Status() SessionStatus
}

type SessionStatus added in v3.37.7 

type SessionStatus = string

type Statement 

type Statement interface {
	Execute(
		ctx context.Context,
		tx *TransactionControl,
		params *QueryParameters,
		opts ...options.ExecuteDataQueryOption,
	) (txr Transaction, r result.Result, err error)
	NumInput() int
	Text() string
}

type Transaction 

type Transaction interface {
	TransactionActor

	CommitTx(
		ctx context.Context,
		opts ...options.CommitTransactionOption,
	) (r result.Result, err error)
	Rollback(
		ctx context.Context,
	) (err error)
}

type TransactionActor added in v3.5.2 

type TransactionActor interface {
	TransactionIdentifier

	Execute(
		ctx context.Context,
		query string,
		params *QueryParameters,
		opts ...options.ExecuteDataQueryOption,
	) (result.Result, error)
	ExecuteStatement(
		ctx context.Context,
		stmt Statement,
		params *QueryParameters,
		opts ...options.ExecuteDataQueryOption,
	) (result.Result, error)
}

type TransactionControl 

type TransactionControl struct {
	// contains filtered or unexported fields
}

func DefaultTxControl added in v3.20.0 

func DefaultTxControl() *TransactionControl

DefaultTxControl returns default transaction control with serializable read-write isolation mode and auto-commit

func OnlineReadOnlyTxControl added in v3.36.0 

func OnlineReadOnlyTxControl(opts ...TxOnlineReadOnlyOption) *TransactionControl

OnlineReadOnlyTxControl returns online read-only transaction control

func SerializableReadWriteTxControl added in v3.37.0 

func SerializableReadWriteTxControl(opts ...TxControlOption) *TransactionControl

SerializableReadWriteTxControl returns transaction control with serializable read-write isolation mode

func StaleReadOnlyTxControl added in v3.36.0 

func StaleReadOnlyTxControl() *TransactionControl

StaleReadOnlyTxControl returns stale read-only transaction control

func TxControl 

func TxControl(opts ...TxControlOption) *TransactionControl

TxControl makes transaction control from given options

func (*TransactionControl) Desc 

func (t *TransactionControl) Desc() *Ydb_Table.TransactionControl

type TransactionIdentifier added in v3.5.2 

type TransactionIdentifier interface {
	ID() string
}

type TransactionSettings 

type TransactionSettings struct {
	// contains filtered or unexported fields
}

func TxSettings 

func TxSettings(opts ...TxOption) *TransactionSettings

TxSettings returns transaction settings

func (*TransactionSettings) Settings 

func (t *TransactionSettings) Settings() *Ydb_Table.TransactionSettings

type TxControlOption 

type TxControlOption func(*txControlDesc)

func BeginTx 

func BeginTx(opts ...TxOption) TxControlOption

BeginTx returns begin transaction control option

func CommitTx 

func CommitTx() TxControlOption

CommitTx returns commit transaction control option

func WithTx 

func WithTx(t TransactionIdentifier) TxControlOption

func WithTxID added in v3.41.0 

func WithTxID(txID string) TxControlOption

type TxOnlineReadOnlyOption 

type TxOnlineReadOnlyOption func(*txOnlineReadOnly)

func WithInconsistentReads 

func WithInconsistentReads() TxOnlineReadOnlyOption

type TxOperation added in v3.5.0 

type TxOperation func(ctx context.Context, tx TransactionActor) error

TxOperation is the interface that holds an operation for retry. if TxOperation returns not nil - operation will retry if TxOperation returns nil - retry loop will break

type TxOption 

type TxOption func(*txDesc)

Transaction control options

func WithOnlineReadOnly 

func WithOnlineReadOnly(opts ...TxOnlineReadOnlyOption) TxOption

func WithSerializableReadWrite 

func WithSerializableReadWrite() TxOption

func WithSnapshotReadOnly added in v3.38.0 

func WithSnapshotReadOnly() TxOption

func WithStaleReadOnly 

func WithStaleReadOnly() TxOption

Source Files

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