dbutil

Documentation

Index

• Variables
• func Configure(ctx context.Context, db ConfigurableDB, dbName string, mon *monkit.Scope)
• func EscapableCommaSplit(val string) []string
• func ParseDBMapping(urlSpec string) (map[string]string, error)
• func SchemeForImplementation(implementation Implementation) string
• type ConfigurableDB
• type Implementation
  • func ImplementationForScheme(scheme string) Implementation
  • func SplitConnStr(s string) (driver string, source string, implementation Implementation, err error)
  • func (impl Implementation) AsOfSystemInterval(interval time.Duration) string
  • func (impl Implementation) AsOfSystemTime(t time.Time) string
  • func (impl Implementation) Float64Type() string
  • func (impl Implementation) String() string
  • func (impl Implementation) WrapAsOfSystemInterval(sql string, interval time.Duration) string
  • func (impl Implementation) WrapAsOfSystemTime(sql string, t time.Time) string
• type NullTime
  • func (nt *NullTime) Scan(value interface{}) error
  • func (nt NullTime) Value() (driver.Value, error)
• type TempDatabase
  • func (db *TempDatabase) Close() error

Variables

var ErrNullTime = errs.Class("null time")

ErrNullTime defines error class for NullTime.

Functions

func Configure

func Configure(ctx context.Context, db ConfigurableDB, dbName string, mon *monkit.Scope)

Configure Sets Connection Boundaries and adds db_stats monitoring to monkit.

func EscapableCommaSplit

func EscapableCommaSplit(val string) []string

EscapableCommaSplit is like strings.Split(x, ","), but if it sees two ','s in a row, it will treat them like one unsplit comma. So "hello,there,,friend" will result in ["hello", "there,friend"].

func ParseDBMapping

func ParseDBMapping(urlSpec string) (map[string]string, error)

ParseDBMapping parses a mapping of database connection URLs, preceded by the default URL. An example that overrides the repairqueue looks like: cockroach://user:pw@host/database,repairqueue:postgres://user:pw@host/database. The default is stored in "".

func SchemeForImplementation

func SchemeForImplementation(implementation Implementation) string

SchemeForImplementation returns the scheme that is used for URLs that use the given Implementation.

Types

type ConfigurableDB

type ConfigurableDB interface {
	SetMaxIdleConns(int)
	SetMaxOpenConns(int)
	SetConnMaxLifetime(time.Duration)
	Stats() sql.DBStats
}

ConfigurableDB contains methods for configuring a database.

type Implementation

type Implementation int

Implementation type of valid DBs.

const (
	// Unknown is an unknown db type.
	Unknown Implementation = iota
	// Postgres is a Postgresdb type.
	Postgres
	// Cockroach is a Cockroachdb type.
	Cockroach
	// Bolt is a Bolt kv store.
	Bolt
	// Redis is a Redis kv store.
	Redis
	// SQLite3 is a sqlite3 database.
	SQLite3
	// Spanner is Google Spanner instance with Google SQL dialect.
	Spanner
)

func ImplementationForScheme

func ImplementationForScheme(scheme string) Implementation

ImplementationForScheme returns the Implementation that is used for the url with the provided scheme.

func SplitConnStr

func SplitConnStr(s string) (driver string, source string, implementation Implementation, err error)

SplitConnStr returns the driver and DSN portions of a URL, along with the db implementation.

func (Implementation) AsOfSystemInterval

func (impl Implementation) AsOfSystemInterval(interval time.Duration) string

AsOfSystemInterval returns a SQL query for the specifying the AS OF SYSTEM TIME using a relative interval. The interval should be negative.

func (Implementation) AsOfSystemTime

func (impl Implementation) AsOfSystemTime(t time.Time) string

AsOfSystemTime returns a SQL query for the specifying the AS OF SYSTEM TIME using a concrete time.

func (Implementation) Float64Type

func (impl Implementation) Float64Type() string

Float64Type returns the type name for the given implementation.

func (Implementation) String

func (impl Implementation) String() string

String returns the default name for a given implementation.

func (Implementation) WrapAsOfSystemInterval

func (impl Implementation) WrapAsOfSystemInterval(sql string, interval time.Duration) string

WrapAsOfSystemInterval converts a query to include AS OF SYSTEM TIME using a relative interval. The interval should be negative.

func (Implementation) WrapAsOfSystemTime

func (impl Implementation) WrapAsOfSystemTime(sql string, t time.Time) string

WrapAsOfSystemTime converts a query to include AS OF SYSTEM TIME using a concrete time.

type NullTime

type NullTime struct {
	time.Time
	Valid bool
}

NullTime time helps convert nil to time.Time.

func (*NullTime) Scan

func (nt *NullTime) Scan(value interface{}) error

Scan implements the Scanner interface.

func (NullTime) Value

func (nt NullTime) Value() (driver.Value, error)

Value implements the driver Valuer interface.

type TempDatabase

type TempDatabase struct {
	tagsql.DB
	ConnStr        string
	Schema         string
	Driver         string
	Implementation Implementation
	Cleanup        func(tagsql.DB) error
}

TempDatabase is a database (or something that works like an isolated database, such as a PostgreSQL schema) with a semi-unique name which will be cleaned up when closed. Mainly useful for testing purposes.

func (*TempDatabase) Close

func (db *TempDatabase) Close() error

Close closes the database and deletes the schema.