edgedb

package module
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 Go to latest Published: May 6, 2021 License: Apache-2.0 Imports: 38 Imported by: 0

README

The Go driver for EdgeDB

Build Status Join GitHub discussions

Installation

$ go get https://github.com/edgedb/edgedb-go

Basic Usage

Follow the EdgeDB tutorial to get EdgeDB installed and minimally configured.

package main

import (
	"context"
	"fmt"
	"log"

	"github.com/edgedb/edgedb-go"
)

func main() {
	opts := edgedb.Options{
		Database: "edgedb",
		User: "edgedb",
		MinConns: 1,
		MaxConns: 4,
	}

	ctx := context.Background()
	pool, err := edgedb.Connect(ctx, opts)
	if err != nil {
		log.Fatal(err)
	}
	defer pool.Close()

	var result string
	err = pool.QueryOne(ctx, "SELECT 'hello EdgeDB!'", &result)
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println(result)
}

Development

A local installation of EdgeDB is required to run tests. Download EdgeDB from here or build it manually.

To run the test suite run make test. To run lints make lint.

License

edgedb-go is developed and distributed under the Apache 2.0 license.

Documentation

Overview

Package edgedb is the official Go EdgeDB driver. https://edgedb.com

Typical usage looks like this: 

import (
    "context"
    "log"

    "github.com/edgedb/edgedb-go"
)

opts := edgedb.Options{
    MinConns: 1,
    MaxConns: 4,
}

func main() {
    ctx := context.Background()
    pool, err := edgedb.ConnectDSN(ctx, "my_instance", opts)
    if err != nil {
        log.Fatal(err)
    }
    defer pool.Close()

    var (
        age int64 = 21
        users []struct{
            ID edgedb.UUID `edgedb:"id"`
            Name string    `edgedb:"name"`
        }
    )

    query := "SELECT User{name} WHERE .age = <int64>$0"
    err = pool.Query(ctx, query, &users, age)
    ...
}

You can also connect to a database using a DSN: 

url := "edgedb://edgedb@localhost/edgedb"
pool, err := edgedb.ConnectDSN(ctx, url, opts)

Or you can use Option fields. 

opts := edgedb.Options{
    Database: "edgedb",
    User:     "edgedb",
    MinConns: 1,
    MaxConns: 4,
}

pool, err := edgedb.Connect(ctx, opts)

Pooling

Most use cases will benefit from the concurrency safe pool implementation returned from Connect() and ConnectDSN(). Pool.Acquire(), ConnectOne() and ConnectOneDSN() will give you access to a single connection.

Errors

edgedb never returns underlying errors directly. If you are checking for things like context expiration use errors.Is() or errors.As(). 

err := pool.Query(...)
if errors.Is(err, context.Canceled) { ... }

Most errors returned by the edgedb package will satisfy the edgedb.Error interface which has methods for introspecting. 

err := pool.Query(...)

var edbErr edgedb.Error
if errors.As(err, &edbErr) && edbErr.Category(edgedb.NoDataError){
    ...
}

Datatypes

The following list shows the marshal/unmarshal mapping between EdgeDB types and go types: 

EdgeDB                Go
---------             ---------
Set                   []anytype
array<anytype>        []anytype
tuple                 struct
named tuple           struct
Object                struct
bool                  bool
bytes                 []byte
str                   string
anyenum               string
datetime              time.Time
cal::local_datetime   edgedb.LocalDateTime
cal::local_date       edgedb.LocalDate
cal::local_time       edgedb.LocalTime
duration              time.Duration
float32               float32
float64               float64
int16                 int16
int32                 int32
int64                 int64
uuid                  edgedb.UUID
json                  []byte
bigint                *big.Int

decimal               user defined (see Custom Codecs)

Custom Codecs

User defined marshaler/unmarshalers can be defined for any scalar EdgeDB type except arrays. The marshaler interfaces are documented in the internal/codecs package.

Example 
// This source file is part of the EdgeDB open source project.
//
// Copyright 2020-present EdgeDB Inc. and the EdgeDB authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package main

import (
	"context"
	"fmt"
	"log"
	"time"

	"github.com/edgedb/edgedb-go"
)

type User struct {
	ID   edgedb.UUID `edgedb:"id"`
	Name string      `edgedb:"name"`
	DOB  time.Time   `edgedb:"dob"`
}

func main() {
	opts := edgedb.Options{
		MinConns: 1,
		MaxConns: 4,
	}

	ctx := context.Background()
	db, err := edgedb.ConnectDSN(ctx, "edgedb://edgedb@localhost/test", opts)
	if err != nil {
		log.Fatal(err)
	}
	defer db.Close()

	// create a user object type.
	err = db.Execute(ctx, `
		CREATE TYPE User {
			CREATE REQUIRED PROPERTY name -> str;
			CREATE PROPERTY dob -> datetime;
		}
	`)
	if err != nil {
		log.Fatal(err)
	}

	// Insert a new user.
	var inserted struct{ id edgedb.UUID }
	err = db.QueryOne(ctx, `
		INSERT User {
			name := <str>$1,
			dob := <datetime>$2
		}
	`, inserted, "Bob", time.Date(1984, 3, 1, 0, 0, 0, 0, time.UTC))
	if err != nil {
		log.Fatal(err)
	}

	// Select users.
	var users []User
	args := map[string]interface{}{"name": "Bob"}
	query := "SELECT User {name, dob} FILTER .name = <str>$name"
	err = db.Query(ctx, query, &users, args)
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println(users)
}

Index

Examples

Constants

View Source 
const (
	// TxConflict indicates that the server could not complete a transaction
	// because it encountered a deadlock or serialization error.
	TxConflict = iota

	// NetworkError indicates that the transaction was interupted
	// by a network error.
	NetworkError
)

The following conditions can be configured with a custom RetryRule. See RetryOptions.

Variables

View Source 
var (
	// ParseUUID parses s into a UUID or returns an error.
	ParseUUID = edgedbtypes.ParseUUID

	// NewLocalDateTime returns a new LocalDateTime
	NewLocalDateTime = edgedbtypes.NewLocalDateTime

	// NewLocalDate returns a new LocalDate
	NewLocalDate = edgedbtypes.NewLocalDate

	// NewLocalTime returns a new LocalTime
	NewLocalTime = edgedbtypes.NewLocalTime
)

Functions

This section is empty.

Types

type Action 

type Action func(context.Context, *Tx) error

Action is work to be done in a transaction.

type Conn 

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

Conn is a single Conn to a server. Conn is not safe for concurrent use. Pool should be preferred over Conn for most use cases.

func ConnectOne 

func ConnectOne(ctx context.Context, opts Options) (*Conn, error)

ConnectOne establishes a connection to an EdgeDB server.

func ConnectOneDSN 

func ConnectOneDSN(
	ctx context.Context,
	dsn string,
	opts Options,
) (*Conn, error)

ConnectOneDSN establishes a connection to an EdgeDB server.

dsn is either an instance name https://www.edgedb.com/docs/clients/00_python/instances/#edgedb-instances or it specifies a single string in the following format: 

edgedb://user:password@host:port/database?option=value.

The following options are recognized: host, port, user, database, password.

func (*Conn) Close 

func (c *Conn) Close() error

Close closes the connection. Connections are not usable after they are closed.

func (Conn) Execute added in v0.6.0 

func (b Conn) Execute(ctx context.Context, cmd string) error

Execute an EdgeQL command (or commands).

func (Conn) Query added in v0.6.0 

func (b Conn) Query(
	ctx context.Context,
	cmd string,
	out interface{},
	args ...interface{},
) error

Query runs a query and returns the results.

func (Conn) QueryJSON added in v0.6.0 

func (b Conn) QueryJSON(
	ctx context.Context,
	cmd string,
	out *[]byte,
	args ...interface{},
) error

QueryJSON runs a query and return the results as JSON.

func (Conn) QueryOne added in v0.6.0 

func (b Conn) QueryOne(
	ctx context.Context,
	cmd string,
	out interface{},
	args ...interface{},
) error

QueryOne runs a singleton-returning query and returns its element. If the query executes successfully but doesn't return a result a NoDataError is returned.

func (Conn) QueryOneJSON added in v0.6.0 

func (b Conn) QueryOneJSON(
	ctx context.Context,
	cmd string,
	out *[]byte,
	args ...interface{},
) error

QueryOneJSON runs a singleton-returning query. If the query executes successfully but doesn't have a result a NoDataError is returned.

func (*Conn) RawTx added in v0.6.0 

func (c *Conn) RawTx(ctx context.Context, action Action) error

RawTx runs an action in a transaction. If the action returns an error the transaction is rolled back, otherwise it is committed.

func (*Conn) RetryingTx added in v0.6.0 

func (c *Conn) RetryingTx(ctx context.Context, action Action) error

RetryingTx does the same as RawTx but retries failed actions if they might succeed on a subsequent attempt.

func (Conn) WithRetryOptions added in v0.6.0 

func (c Conn) WithRetryOptions(opts RetryOptions) *Conn

WithRetryOptions returns a shallow copy of the connection with the RetryOptions set to opts.

func (Conn) WithTxOptions added in v0.6.0 

func (c Conn) WithTxOptions(opts TxOptions) *Conn

WithTxOptions returns a shallow copy of the connection with the TxOptions set to opts.

type Duration 

type Duration = edgedbtypes.Duration

Duration representing a span of time.

type Error 

type Error interface {
	Error() string
	Unwrap() error

	// HasTag returns true if the error is marked with the supplied tag.
	HasTag(ErrorTag) bool

	// Category returns true if the error is in the provided category.
	Category(ErrorCategory) bool
}

Error is the error type returned from edgedb.

type ErrorCategory 

type ErrorCategory string

ErrorCategory values represent EdgeDB's error types. 

const (
	InternalServerError                    ErrorCategory = "errors::InternalServerError"
	UnsupportedFeatureError                ErrorCategory = "errors::UnsupportedFeatureError"
	ProtocolError                          ErrorCategory = "errors::ProtocolError"
	BinaryProtocolError                    ErrorCategory = "errors::BinaryProtocolError"
	UnsupportedProtocolVersionError        ErrorCategory = "errors::UnsupportedProtocolVersionError"
	TypeSpecNotFoundError                  ErrorCategory = "errors::TypeSpecNotFoundError"
	UnexpectedMessageError                 ErrorCategory = "errors::UnexpectedMessageError"
	InputDataError                         ErrorCategory = "errors::InputDataError"
	ResultCardinalityMismatchError         ErrorCategory = "errors::ResultCardinalityMismatchError"
	CapabilityError                        ErrorCategory = "errors::CapabilityError"
	UnsupportedCapabilityError             ErrorCategory = "errors::UnsupportedCapabilityError"
	DisabledCapabilityError                ErrorCategory = "errors::DisabledCapabilityError"
	QueryError                             ErrorCategory = "errors::QueryError"
	InvalidSyntaxError                     ErrorCategory = "errors::InvalidSyntaxError"
	EdgeQLSyntaxError                      ErrorCategory = "errors::EdgeQLSyntaxError"
	SchemaSyntaxError                      ErrorCategory = "errors::SchemaSyntaxError"
	GraphQLSyntaxError                     ErrorCategory = "errors::GraphQLSyntaxError"
	InvalidTypeError                       ErrorCategory = "errors::InvalidTypeError"
	InvalidTargetError                     ErrorCategory = "errors::InvalidTargetError"
	InvalidLinkTargetError                 ErrorCategory = "errors::InvalidLinkTargetError"
	InvalidPropertyTargetError             ErrorCategory = "errors::InvalidPropertyTargetError"
	InvalidReferenceError                  ErrorCategory = "errors::InvalidReferenceError"
	UnknownModuleError                     ErrorCategory = "errors::UnknownModuleError"
	UnknownLinkError                       ErrorCategory = "errors::UnknownLinkError"
	UnknownPropertyError                   ErrorCategory = "errors::UnknownPropertyError"
	UnknownUserError                       ErrorCategory = "errors::UnknownUserError"
	UnknownDatabaseError                   ErrorCategory = "errors::UnknownDatabaseError"
	UnknownParameterError                  ErrorCategory = "errors::UnknownParameterError"
	SchemaError                            ErrorCategory = "errors::SchemaError"
	SchemaDefinitionError                  ErrorCategory = "errors::SchemaDefinitionError"
	InvalidDefinitionError                 ErrorCategory = "errors::InvalidDefinitionError"
	InvalidModuleDefinitionError           ErrorCategory = "errors::InvalidModuleDefinitionError"
	InvalidLinkDefinitionError             ErrorCategory = "errors::InvalidLinkDefinitionError"
	InvalidPropertyDefinitionError         ErrorCategory = "errors::InvalidPropertyDefinitionError"
	InvalidUserDefinitionError             ErrorCategory = "errors::InvalidUserDefinitionError"
	InvalidDatabaseDefinitionError         ErrorCategory = "errors::InvalidDatabaseDefinitionError"
	InvalidOperatorDefinitionError         ErrorCategory = "errors::InvalidOperatorDefinitionError"
	InvalidAliasDefinitionError            ErrorCategory = "errors::InvalidAliasDefinitionError"
	InvalidFunctionDefinitionError         ErrorCategory = "errors::InvalidFunctionDefinitionError"
	InvalidConstraintDefinitionError       ErrorCategory = "errors::InvalidConstraintDefinitionError"
	InvalidCastDefinitionError             ErrorCategory = "errors::InvalidCastDefinitionError"
	DuplicateDefinitionError               ErrorCategory = "errors::DuplicateDefinitionError"
	DuplicateModuleDefinitionError         ErrorCategory = "errors::DuplicateModuleDefinitionError"
	DuplicateLinkDefinitionError           ErrorCategory = "errors::DuplicateLinkDefinitionError"
	DuplicatePropertyDefinitionError       ErrorCategory = "errors::DuplicatePropertyDefinitionError"
	DuplicateUserDefinitionError           ErrorCategory = "errors::DuplicateUserDefinitionError"
	DuplicateDatabaseDefinitionError       ErrorCategory = "errors::DuplicateDatabaseDefinitionError"
	DuplicateOperatorDefinitionError       ErrorCategory = "errors::DuplicateOperatorDefinitionError"
	DuplicateViewDefinitionError           ErrorCategory = "errors::DuplicateViewDefinitionError"
	DuplicateFunctionDefinitionError       ErrorCategory = "errors::DuplicateFunctionDefinitionError"
	DuplicateConstraintDefinitionError     ErrorCategory = "errors::DuplicateConstraintDefinitionError"
	DuplicateCastDefinitionError           ErrorCategory = "errors::DuplicateCastDefinitionError"
	QueryTimeoutError                      ErrorCategory = "errors::QueryTimeoutError"
	ExecutionError                         ErrorCategory = "errors::ExecutionError"
	InvalidValueError                      ErrorCategory = "errors::InvalidValueError"
	DivisionByZeroError                    ErrorCategory = "errors::DivisionByZeroError"
	NumericOutOfRangeError                 ErrorCategory = "errors::NumericOutOfRangeError"
	IntegrityError                         ErrorCategory = "errors::IntegrityError"
	ConstraintViolationError               ErrorCategory = "errors::ConstraintViolationError"
	CardinalityViolationError              ErrorCategory = "errors::CardinalityViolationError"
	MissingRequiredError                   ErrorCategory = "errors::MissingRequiredError"
	TransactionError                       ErrorCategory = "errors::TransactionError"
	TransactionConflictError               ErrorCategory = "errors::TransactionConflictError"
	TransactionSerializationError          ErrorCategory = "errors::TransactionSerializationError"
	TransactionDeadlockError               ErrorCategory = "errors::TransactionDeadlockError"
	ConfigurationError                     ErrorCategory = "errors::ConfigurationError"
	AccessError                            ErrorCategory = "errors::AccessError"
	AuthenticationError                    ErrorCategory = "errors::AuthenticationError"
	ClientError                            ErrorCategory = "errors::ClientError"
	ClientConnectionError                  ErrorCategory = "errors::ClientConnectionError"
	ClientConnectionFailedError            ErrorCategory = "errors::ClientConnectionFailedError"
	ClientConnectionFailedTemporarilyError ErrorCategory = "errors::ClientConnectionFailedTemporarilyError"
	ClientConnectionTimeoutError           ErrorCategory = "errors::ClientConnectionTimeoutError"
	ClientConnectionClosedError            ErrorCategory = "errors::ClientConnectionClosedError"
	InterfaceError                         ErrorCategory = "errors::InterfaceError"
	QueryArgumentError                     ErrorCategory = "errors::QueryArgumentError"
	MissingArgumentError                   ErrorCategory = "errors::MissingArgumentError"
	UnknownArgumentError                   ErrorCategory = "errors::UnknownArgumentError"
	InvalidArgumentError                   ErrorCategory = "errors::InvalidArgumentError"
	NoDataError                            ErrorCategory = "errors::NoDataError"
)

type ErrorTag 

type ErrorTag string

ErrorTag is the argument type to Error.HasTag(). 

const (
	ShouldRetry     ErrorTag = "SHOULD_RETRY"
	ShouldReconnect ErrorTag = "SHOULD_RECONNECT"
)

type IsolationLevel added in v0.6.0 

type IsolationLevel string

IsolationLevel documentation can be found here https://www.edgedb.com/docs/edgeql/statements/tx_start#parameters 

const (
	Serializable   IsolationLevel = "serializable"
	RepeatableRead IsolationLevel = "repeatable_read"
)

The available levels are:

type LocalDate 

type LocalDate = edgedbtypes.LocalDate

LocalDate is a date without a time zone.

type LocalDateTime 

type LocalDateTime = edgedbtypes.LocalDateTime

LocalDateTime is a date and time without a time zone.

type LocalTime 

type LocalTime = edgedbtypes.LocalTime

LocalTime is a time without a time zone.

type Options 

type Options struct {
	// Hosts is a slice of database host addresses as one of the following
	//
	// - an IP address or domain name
	//
	// - an absolute path to the directory
	//   containing the database server Unix-domain socket
	//   (not supported on Windows)
	//
	// If the slice is empty, the following will be tried, in order:
	//
	// - host address(es) parsed from the dsn argument
	//
	// - the value of the EDGEDB_HOST environment variable
	//
	// - on Unix, common directories used for EdgeDB Unix-domain sockets:
	//   "/run/edgedb" and "/var/run/edgedb"
	//
	// - "localhost"
	Hosts []string

	// Ports is a slice of port numbers to connect to at the server host
	// (or Unix-domain socket file extension).
	//
	// Ports may either be:
	//
	// - the same length ans Hosts
	//
	// - a single port to be used all specified hosts
	//
	// - empty indicating the value parsed from the dsn argument
	//   should be used, or the value of the EDGEDB_PORT environment variable,
	//   or 5656 if neither is specified.
	Ports []int

	// User is the name of the database role used for authentication.
	// If not specified, the value parsed from the dsn argument is used,
	// or the value of the EDGEDB_USER environment variable,
	// or the operating system name of the user running the application.
	User string

	// Database is the name of the database to connect to.
	// If not specified, the value parsed from the dsn argument is used,
	// or the value of the EDGEDB_DATABASE environment variable,
	// or the operating system name of the user running the application.
	Database string

	// Password to be used for authentication,
	// if the server requires one. If not specified,
	// the value parsed from the dsn argument is used,
	// or the value of the EDGEDB_PASSWORD environment variable.
	// Note that the use of the environment variable is discouraged
	// as other users and applications may be able to read it
	// without needing specific privileges.
	Password string

	// ConnectTimeout is used when establishing connections in the background.
	ConnectTimeout time.Duration

	// WaitUntilAvailable determines how long to wait
	// to reestablish a connection.
	WaitUntilAvailable time.Duration

	// MinConns determines the minimum number of connections.
	// If MinConns is zero, 1 will be used.
	// Has no effect for single connections.
	MinConns uint

	// MaxConns determines the maximum number of connections.
	// If MaxConns is zero, max(4, runtime.NumCPU()) will be used.
	// Has no effect for single connections.
	MaxConns uint

	// ServerSettings is currently unused.
	ServerSettings map[string]string
}

Options for connecting to an EdgeDB server

type Pool 

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

Pool is a connection pool and is safe for concurrent use.

func Connect 

func Connect(ctx context.Context, opts Options) (*Pool, error)

Connect a pool of connections to a server.

func ConnectDSN 

func ConnectDSN(ctx context.Context, dsn string, opts Options) (*Pool, error)

ConnectDSN connects a pool to a server.

dsn is either an instance name https://www.edgedb.com/docs/clients/00_python/instances/#edgedb-instances or it specifies a single string in the following format: 

edgedb://user:password@host:port/database?option=value.

The following options are recognized: host, port, user, database, password.

func (*Pool) Acquire 

func (p *Pool) Acquire(ctx context.Context) (*PoolConn, error)

Acquire returns a connection from the pool blocking until a connection is available. Acquired connections must be released to the pool when no longer needed.

func (*Pool) Close 

func (p *Pool) Close() error

Close closes all connections in the pool. Calling close blocks until all acquired connections have been released, and returns an error if called more than once.

func (*Pool) Execute added in v0.6.0 

func (p *Pool) Execute(ctx context.Context, cmd string) error

Execute an EdgeQL command (or commands).

func (*Pool) Query added in v0.6.0 

func (p *Pool) Query(
	ctx context.Context,
	cmd string,
	out interface{},
	args ...interface{},
) error

Query runs a query and returns the results.

func (*Pool) QueryJSON added in v0.6.0 

func (p *Pool) QueryJSON(
	ctx context.Context,
	cmd string,
	out *[]byte,
	args ...interface{},
) error

QueryJSON runs a query and return the results as JSON.

func (*Pool) QueryOne added in v0.6.0 

func (p *Pool) QueryOne(
	ctx context.Context,
	cmd string,
	out interface{},
	args ...interface{},
) error

QueryOne runs a singleton-returning query and returns its element. If the query executes successfully but doesn't return a result a NoDataError is returned.

func (*Pool) QueryOneJSON added in v0.6.0 

func (p *Pool) QueryOneJSON(
	ctx context.Context,
	cmd string,
	out *[]byte,
	args ...interface{},
) error

QueryOneJSON runs a singleton-returning query. If the query executes successfully but doesn't have a result a NoDataError is returned.

func (*Pool) RawTx added in v0.6.0 

func (p *Pool) RawTx(ctx context.Context, action Action) error

RawTx runs an action in a transaction. If the action returns an error the transaction is rolled back, otherwise it is committed.

func (*Pool) RetryingTx added in v0.6.0 

func (p *Pool) RetryingTx(ctx context.Context, action Action) error

RetryingTx does the same as RawTx but retries failed actions if they might succeed on a subsequent attempt.

Retries are governed by retry rules. The default rule can be set with WithRetryRule(). For more fine grained control a retry rule can be set for each defined RetryCondition using WithRetryCondition(). When a transaction fails but is retryable the rule for the failure condition is used to determine if the transaction should be tried again based on RetryRule.Attempts and the amount of time to wait before retrying is determined by RetryRule.Backoff. If either field is unset (see RetryRule) then the default rule is used. If the object's default is unset the fall back is 3 attempts and exponential backoff.

func (Pool) WithRetryOptions added in v0.6.0 

func (p Pool) WithRetryOptions(opts RetryOptions) *Pool

WithRetryOptions returns a shallow copy of the pool with the RetryOptions set to opts.

func (Pool) WithTxOptions added in v0.6.0 

func (p Pool) WithTxOptions(opts TxOptions) *Pool

WithTxOptions returns a shallow copy of the pool with the TxOptions set to opts.

type PoolConn 

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

PoolConn is a pooled connection.

func (*PoolConn) Execute added in v0.6.0 

func (c *PoolConn) Execute(ctx context.Context, cmd string) error

Execute an EdgeQL command (or commands).

func (*PoolConn) Query added in v0.6.0 

func (c *PoolConn) Query(
	ctx context.Context,
	cmd string,
	out interface{},
	args ...interface{},
) error

Query runs a query and returns the results.

func (*PoolConn) QueryJSON added in v0.6.0 

func (c *PoolConn) QueryJSON(
	ctx context.Context,
	cmd string,
	out *[]byte,
	args ...interface{},
) error

QueryJSON runs a query and return the results as JSON.

func (*PoolConn) QueryOne added in v0.6.0 

func (c *PoolConn) QueryOne(
	ctx context.Context,
	cmd string,
	out interface{},
	args ...interface{},
) error

QueryOne runs a singleton-returning query and returns its element. If the query executes successfully but doesn't return a result a NoDataError is returned.

func (*PoolConn) QueryOneJSON added in v0.6.0 

func (c *PoolConn) QueryOneJSON(
	ctx context.Context,
	cmd string,
	out *[]byte,
	args ...interface{},
) error

QueryOneJSON runs a singleton-returning query. If the query executes successfully but doesn't have a result a NoDataError is returned.

func (*PoolConn) RawTx added in v0.6.0 

func (c *PoolConn) RawTx(ctx context.Context, action Action) error

RawTx runs an action in a transaction. If the action returns an error the transaction is rolled back, otherwise it is committed.

func (*PoolConn) Release 

func (c *PoolConn) Release() error

Release the connection back to its pool. Release returns an error if called more than once. A PoolConn is not usable after Release has been called.

func (*PoolConn) RetryingTx added in v0.6.0 

func (c *PoolConn) RetryingTx(ctx context.Context, action Action) error

RetryingTx does the same as RawTx but retries failed actions if they might succeed on a subsequent attempt.

func (PoolConn) WithRetryOptions added in v0.6.0 

func (c PoolConn) WithRetryOptions(opts RetryOptions) *PoolConn

WithRetryOptions returns a shallow copy of the connection with the RetryOptions set to opts.

func (PoolConn) WithTxOptions added in v0.6.0 

func (c PoolConn) WithTxOptions(opts TxOptions) *PoolConn

WithTxOptions returns a shallow copy of the connection with the TxOptions set to opts.

type RetryBackoff added in v0.6.0 

type RetryBackoff func(n int) time.Duration

RetryBackoff returns the duration to wait after the nth attempt before making the next attempt when retrying a transaction.

type RetryCondition added in v0.6.0 

type RetryCondition int

RetryCondition represents scenarios that can caused a transaction run in RetryingTx() methods to be retried.

type RetryOptions added in v0.6.0 

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

RetryOptions configures how RetryingTx() retries failed transactions. Use NewRetryOptions to get a default RetryOptions value instead of creating one yourself.

func (RetryOptions) WithCondition added in v0.6.0 

func (o RetryOptions) WithCondition(
	condition RetryCondition,
	rule RetryRule,
) RetryOptions

WithCondition sets the retry rule for the specified condition.

func (RetryOptions) WithDefault added in v0.6.0 

func (o RetryOptions) WithDefault(rule RetryRule) RetryOptions

WithDefault sets the rule for all conditions to rule.

type RetryRule added in v0.6.0 

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

RetryRule determines how transactions should be retried when run in RetryingTx() methods. See Pool.RetryingTx() for details.

func NewRetryRule added in v0.6.0 

func NewRetryRule() RetryRule

NewRetryRule returns the default RetryRule value.

func (RetryRule) WithAttempts added in v0.6.0 

func (r RetryRule) WithAttempts(attempts int) RetryRule

WithAttempts sets the rule's attempts. attempts must be greater than zero.

func (RetryRule) WithBackoff added in v0.6.0 

func (r RetryRule) WithBackoff(fn RetryBackoff) RetryRule

WithBackoff returns a copy of the RetryRule with backoff set to fn.

type Tx 

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

Tx is a transaction. Use RetryingTx() or RawTx() to get a transaction.

func (*Tx) Execute added in v0.6.0 

func (t *Tx) Execute(ctx context.Context, cmd string) error

Execute an EdgeQL command (or commands).

func (*Tx) Query added in v0.6.0 

func (t *Tx) Query(
	ctx context.Context,
	cmd string,
	out interface{},
	args ...interface{},
) error

Query runs a query and returns the results.

func (*Tx) QueryJSON added in v0.6.0 

func (t *Tx) QueryJSON(
	ctx context.Context,
	cmd string,
	out *[]byte,
	args ...interface{},
) error

QueryJSON runs a query and return the results as JSON.

func (*Tx) QueryOne added in v0.6.0 

func (t *Tx) QueryOne(
	ctx context.Context,
	cmd string,
	out interface{},
	args ...interface{},
) error

QueryOne runs a singleton-returning query and returns its element. If the query executes successfully but doesn't return a result a NoDataError is returned.

func (*Tx) QueryOneJSON added in v0.6.0 

func (t *Tx) QueryOneJSON(
	ctx context.Context,
	cmd string,
	out *[]byte,
	args ...interface{},
) error

QueryOneJSON runs a singleton-returning query. If the query executes successfully but doesn't have a result a NoDataError is returned.

type TxOptions added in v0.6.0 

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

TxOptions configures how transactions behave.

func NewTxOptions added in v0.6.0 

func NewTxOptions() TxOptions

NewTxOptions returns the default TxOptions value.

func (TxOptions) WithDeferrable added in v0.6.0 

func (o TxOptions) WithDeferrable(d bool) TxOptions

WithDeferrable returns a shallow copy of the pool with the transaction deferrable mode set to d.

func (TxOptions) WithIsolation added in v0.6.0 

func (o TxOptions) WithIsolation(i IsolationLevel) TxOptions

WithIsolation returns a copy of the TxOptions with the isolation level set to i.

func (TxOptions) WithReadOnly added in v0.6.0 

func (o TxOptions) WithReadOnly(r bool) TxOptions

WithReadOnly returns a shallow copy of the pool with the transaction read only access mode set to r.

type UUID 

type UUID = edgedbtypes.UUID

UUID a universally unique identifier

Source Files

View all Source files

Directories

Path Synopsis
edgedb module
internal
aspect
buff
cache
cardinality
cmd/generr command
codecs
descriptor
edgedbtypes
format
header
marshal
message
soc
Package soc has utilities for working with sockets.
 Package soc has utilities for working with sockets.

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