migrate

package
v0.12.0 Latest Latest
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 Go to latest Published: Jun 1, 2023 License: Apache-2.0 Imports: 21 Imported by: 77

Documentation

Index

Constants

View Source 
const HashFileName = "atlas.sum"

HashFileName of the migration directory integrity sum file.

Variables

View Source 
var (
	// ErrChecksumFormat is returned from Validate if the sum files format is invalid.
	ErrChecksumFormat = errors.New("checksum file format invalid")
	// ErrChecksumMismatch is returned from Validate if the hash sums don't match.
	ErrChecksumMismatch = errors.New("checksum mismatch")
	// ErrChecksumNotFound is returned from Validate if the hash file does not exist.
	ErrChecksumNotFound = errors.New("checksum file not found")
)
View Source 
var (
	// WithFormatter calls PlanFormat.
	// Deprecated: use PlanFormat instead.
	WithFormatter = PlanFormat
	// DisableChecksum calls PlanWithChecksum(false).
	// Deprecated: use PlanWithoutChecksum instead.
	DisableChecksum = func() PlannerOption { return PlanWithChecksum(false) }
)
View Source 
var (
	// ErrNoPendingFiles is returned if there are no pending migration files to execute on the managed database.
	ErrNoPendingFiles = errors.New("sql/migrate: execute: nothing to do")
	// ErrSnapshotUnsupported is returned if there is no Snapshoter given.
	ErrSnapshotUnsupported = errors.New("sql/migrate: driver does not support taking a database snapshot")
	// ErrCleanCheckerUnsupported is returned if there is no CleanChecker given.
	ErrCleanCheckerUnsupported = errors.New("sql/migrate: driver does not support checking if database is clean")
	// ErrRevisionNotExist is returned if the requested revision is not found in the storage.
	ErrRevisionNotExist = errors.New("sql/migrate: revision not found")
)
View Source 
var (

	// DefaultFormatter is a default implementation for Formatter.
	DefaultFormatter = TemplateFormatter{
		{
			N: template.Must(template.New("").Funcs(templateFuncs).Parse(
				"{{ with .Version }}{{ . }}{{ else }}{{ now }}{{ end }}{{ with .Name }}_{{ . }}{{ end }}.sql",
			)),
			C: template.Must(template.New("").Funcs(templateFuncs).Parse(
				`{{ range .Changes }}{{ with .Comment }}{{ printf "-- %s%s\n" (slice . 0 1 | upper ) (slice . 1) }}{{ end }}{{ printf "%s;\n" .Cmd }}{{ end }}`,
			)),
		},
	}
)
View Source 
var ErrNoPlan = errors.New("sql/migrate: no plan for matched states")

ErrNoPlan is returned by Plan when there is no change between the two states.

Functions

func ArchiveDir added in v0.10.0 

func ArchiveDir(dir Dir) ([]byte, error)

ArchiveDir returns a tar archive of the given directory.

func FilesLastIndex added in v0.6.0 

func FilesLastIndex(files []File, f func(File) bool) int

FilesLastIndex returns the index of the last file satisfying f(i), or -1 if none do.

func LogIntro added in v0.6.0 

func LogIntro(l Logger, revs []*Revision, files []File)

LogIntro gathers some meta information from the migration files and stored revisions to log some general information prior to actual execution.

func LogNoPendingFiles added in v0.11.0 

func LogNoPendingFiles(l Logger, revs []*Revision)

LogNoPendingFiles starts a new LogExecution and LogDone to indicate that there are no pending files to be executed.

func Validate added in v0.3.7 

func Validate(dir Dir) error

Validate checks if the migration dir is in sync with its sum file. If they don't match ErrChecksumMismatch is returned.

func WriteSumFile added in v0.3.8 

func WriteSumFile(dir Dir, sum HashFile) error

WriteSumFile writes the given HashFile to the Dir. If the file does not exist, it is created.

Types

type Change 

type Change struct {
	// Cmd or statement to execute.
	Cmd string

	// Args for placeholder parameters in the statement above.
	Args []any

	// A Comment describes the change.
	Comment string

	// Reverse contains the "reversed" statement(s) if
	// the command is reversible.
	Reverse any // string | []string

	// The Source that caused this change, or nil.
	Source schema.Change
}

A Change of migration.

func (*Change) ReverseStmts added in v0.9.0 

func (c *Change) ReverseStmts() (cmd []string, err error)

ReverseStmts returns the reverse statements of a Change, if any.

type CleanChecker added in v0.6.0 

type CleanChecker interface {
	// CheckClean checks if the connected realm or schema does not contain any resources besides the
	// revision history table. A NotCleanError is returned in case the connection is not-empty.
	CheckClean(context.Context, *TableIdent) error
}

CleanChecker wraps the single CheckClean method.

type Dir 

type Dir interface {
	fs.FS
	// WriteFile writes the data to the named file.
	WriteFile(string, []byte) error

	// Files returns a set of files stored in this Dir to be executed on a database.
	Files() ([]File, error)

	// Checksum returns a HashFile of the migration directory.
	Checksum() (HashFile, error)
}

Dir wraps the functionality used to interact with a migration directory.

func UnarchiveDir added in v0.10.0 

func UnarchiveDir(arc []byte) (Dir, error)

UnarchiveDir extracts the tar archive into the given directory.

type Driver 

type Driver interface {
	schema.Differ
	schema.ExecQuerier
	schema.Inspector
	PlanApplier
}

The Driver interface must be implemented by the different dialects to support database migration authoring/planning and applying. ExecQuerier, Inspector and Differ, provide basic schema primitives for inspecting database schemas, calculate the difference between schema elements, and executing raw SQL statements. The PlanApplier interface wraps the methods for generating migration plan for applying the actual changes on the database.

type Executor added in v0.3.8 

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

Executor is responsible to manage and execute a set of migration files against a database.

func NewExecutor added in v0.3.8 

func NewExecutor(drv Driver, dir Dir, rrw RevisionReadWriter, opts ...ExecutorOption) (*Executor, error)

NewExecutor creates a new Executor with default values.

func (*Executor) Execute added in v0.3.8 

func (e *Executor) Execute(ctx context.Context, m File) (err error)

Execute executes the given migration file on the database. If it sees a file, that has been partially applied, it will continue with the next statement in line.

func (*Executor) ExecuteN added in v0.4.2 

func (e *Executor) ExecuteN(ctx context.Context, n int) (err error)

ExecuteN executes n pending migration files. If n<=0 all pending migration files are executed.

func (*Executor) ExecuteTo added in v0.8.0 

func (e *Executor) ExecuteTo(ctx context.Context, version string) (err error)

ExecuteTo executes all pending migration files up to and including version.

func (*Executor) Pending added in v0.4.2 

func (e *Executor) Pending(ctx context.Context) ([]File, error)

Pending returns all pending (not fully applied) migration files in the migration directory.

func (*Executor) Replay added in v0.6.0 

func (e *Executor) Replay(ctx context.Context, r StateReader, opts ...ReplayOption) (_ *schema.Realm, err error)

Replay the migration directory and invoke the state to get back the inspection result.

type ExecutorOption added in v0.3.8 

type ExecutorOption func(*Executor) error

ExecutorOption allows configuring an Executor using functional arguments.

func WithAllowDirty added in v0.6.0 

func WithAllowDirty(b bool) ExecutorOption

WithAllowDirty defines if we can start working on a non-clean database in the first migration execution.

func WithBaselineVersion added in v0.6.0 

func WithBaselineVersion(v string) ExecutorOption

WithBaselineVersion allows setting the baseline version of the database on the first migration. Hence, all versions up to and including this version are skipped.

func WithFromVersion added in v0.6.0 

func WithFromVersion(v string) ExecutorOption

WithFromVersion allows passing a file version as a starting point for calculating pending migration scripts. It can be useful for skipping specific files.

func WithLogger added in v0.4.1 

func WithLogger(log Logger) ExecutorOption

WithLogger sets the Logger of an Executor.

func WithOperatorVersion added in v0.6.4 

func WithOperatorVersion(v string) ExecutorOption

WithOperatorVersion sets the operator version to save on the revisions when executing migration files.

type File added in v0.3.4 

type File interface {
	// Name returns the name of the migration file.
	Name() string
	// Desc returns the description of the migration File.
	Desc() string
	// Version returns the version of the migration File.
	Version() string
	// Bytes returns the read content of the file.
	Bytes() []byte
	// Stmts returns the set of SQL statements this file holds.
	Stmts() ([]string, error)
	// StmtDecls returns the set of SQL statements this file holds alongside its preceding comments.
	StmtDecls() ([]*Stmt, error)
}

File represents a single migration file.

type Formatter added in v0.3.4 

type Formatter interface {
	// Format formats the given Plan into one or more migration files.
	Format(*Plan) ([]File, error)
}

Formatter wraps the Format method.

type HashFile added in v0.3.7 

type HashFile []struct{ N, H string }

HashFile represents the integrity sum file of the migration dir.

func NewHashFile added in v0.9.0 

func NewHashFile(files []File) (HashFile, error)

NewHashFile computes and returns a HashFile from the given directory's files.

func (HashFile) MarshalText added in v0.3.7 

func (f HashFile) MarshalText() ([]byte, error)

MarshalText implements encoding.TextMarshaler.

func (HashFile) Sum added in v0.3.7 

func (f HashFile) Sum() string

Sum returns the checksum of the represented hash file.

func (HashFile) SumByName added in v0.7.1 

func (f HashFile) SumByName(n string) (string, error)

SumByName returns the hash for a migration file by its name.

func (*HashFile) UnmarshalText added in v0.3.7 

func (f *HashFile) UnmarshalText(b []byte) error

UnmarshalText implements encoding.TextUnmarshaler.

type HistoryChangedError added in v0.6.0 

type HistoryChangedError struct {
	File string
	Stmt int
}

HistoryChangedError is returned if between two execution attempts already applied statements of a file have changed.

func (HistoryChangedError) Error added in v0.6.0 

func (e HistoryChangedError) Error() string

type LocalDir added in v0.3.4 

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

LocalDir implements Dir for a local migration directory with default Atlas formatting.

func NewLocalDir added in v0.3.4 

func NewLocalDir(path string) (*LocalDir, error)

NewLocalDir returns a new the Dir used by a Planner to work on the given local path.

func (*LocalDir) Checksum added in v0.6.2 

func (d *LocalDir) Checksum() (HashFile, error)

Checksum implements Dir.Checksum. By default, it calls Files() and creates a checksum from them.

func (*LocalDir) Files added in v0.3.8 

func (d *LocalDir) Files() ([]File, error)

Files implements Dir.Files. It looks for all files with .sql suffix and orders them by filename.

func (*LocalDir) Open added in v0.3.4 

func (d *LocalDir) Open(name string) (fs.File, error)

Open implements fs.FS.

func (*LocalDir) Path added in v0.4.3 

func (d *LocalDir) Path() string

Path returns the local path used for opening this dir.

func (*LocalDir) WriteFile added in v0.3.5 

func (d *LocalDir) WriteFile(name string, b []byte) error

WriteFile implements Dir.WriteFile.

type LocalFile added in v0.3.8 

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

LocalFile is used by LocalDir to implement the Scanner interface.

func NewLocalFile added in v0.4.3 

func NewLocalFile(name string, data []byte) *LocalFile

NewLocalFile returns a new local file.

func (LocalFile) Bytes added in v0.4.3 

func (f LocalFile) Bytes() []byte

Bytes returns local file data.

func (LocalFile) Desc added in v0.6.0 

func (f LocalFile) Desc() string

Desc implements File.Desc.

func (LocalFile) Directive added in v0.9.1 

func (f LocalFile) Directive(name string) (ds []string)

Directive returns the (global) file directives that match the provided name. File directives are located at the top of the file and should not be associated with any statement. Hence, double new lines are used to separate file directives from its content.

func (LocalFile) Name added in v0.3.8 

func (f LocalFile) Name() string

Name implements File.Name.

func (LocalFile) StmtDecls added in v0.6.4 

func (f LocalFile) StmtDecls() ([]*Stmt, error)

StmtDecls returns the all statement declarations exist in the local file.

func (LocalFile) Stmts added in v0.6.0 

func (f LocalFile) Stmts() ([]string, error)

Stmts returns the SQL statement exists in the local file.

func (LocalFile) Version added in v0.6.0 

func (f LocalFile) Version() string

Version implements File.Version.

type LogDone added in v0.4.2 

type LogDone struct{}

LogDone is sent if the execution is done.

type LogEntry added in v0.4.1 

type LogEntry interface {
	// contains filtered or unexported methods
}

LogEntry marks several types of logs to be passed to a Logger.

type LogError added in v0.6.0 

type LogError struct {
	SQL   string // Set, if Error was caused by a SQL statement.
	Error error
}

LogError is sent if there is an error while execution.

type LogExecution added in v0.4.1 

type LogExecution struct {
	// From what version.
	From string
	// To what version.
	To string
	// Migration Files to be executed.
	Files []File
}

LogExecution is sent once when execution of multiple migration files has been started. It holds the filenames of the pending migration files.

type LogFile added in v0.4.1 

type LogFile struct {
	// The File being executed.
	File File
	// Version executed.
	// Deprecated: Use File.Version() instead.
	Version string
	// Desc of migration executed.
	// Deprecated: Use File.Desc() instead.
	Desc string
	// Skip holds the number of stmts of this file that will be skipped.
	// This happens, if a migration file was only applied partially and will now continue to be applied.
	Skip int
}

LogFile is sent if a new migration file is executed.

type LogStmt added in v0.4.1 

type LogStmt struct {
	SQL string
}

LogStmt is sent if a new SQL statement is executed.

type Logger added in v0.4.1 

type Logger interface {
	Log(LogEntry)
}

A Logger logs migration execution.

type MemDir added in v0.9.0 

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

MemDir provides an in-memory Dir implementation.

func OpenMemDir added in v0.9.1 

func OpenMemDir(name string) *MemDir

OpenMemDir opens an in-memory directory and registers it in the process namespace with the given name. Hence, calling OpenMemDir with the same name will return the same directory. The directory is deleted when the last reference of it is closed.

func (*MemDir) Checksum added in v0.9.0 

func (d *MemDir) Checksum() (HashFile, error)

Checksum implements Dir.Checksum.

func (*MemDir) Close added in v0.9.1 

func (d *MemDir) Close() error

Close implements the io.Closer interface.

func (*MemDir) Files added in v0.9.0 

func (d *MemDir) Files() ([]File, error)

Files returns a set of files stored in-memory to be executed on a database.

func (*MemDir) Open added in v0.9.0 

func (d *MemDir) Open(name string) (fs.File, error)

Open implements fs.FS.

func (*MemDir) WriteFile added in v0.9.0 

func (d *MemDir) WriteFile(name string, data []byte) error

WriteFile adds a new file in-memory.

type MissingMigrationError added in v0.7.1 

type MissingMigrationError struct{ Version, Description string }

MissingMigrationError is returned if a revision is partially applied but the matching migration file is not found in the migration directory.

func (MissingMigrationError) Error added in v0.7.1 

func (e MissingMigrationError) Error() string

Error implements error.

type NopLogger added in v0.6.0 

type NopLogger struct{}

NopLogger is a Logger that does nothing. It is useful for one-time replay of the migration directory.

func (NopLogger) Log added in v0.6.0 

func (NopLogger) Log(LogEntry)

Log implements the Logger interface.

type NopRevisionReadWriter added in v0.4.2 

type NopRevisionReadWriter struct{}

NopRevisionReadWriter is a RevisionReadWriter that does nothing. It is useful for one-time replay of the migration directory.

func (NopRevisionReadWriter) DeleteRevision added in v0.7.1 

func (NopRevisionReadWriter) DeleteRevision(context.Context, string) error

DeleteRevision implements RevisionsReadWriter.DeleteRevision.

func (NopRevisionReadWriter) Ident added in v0.6.0 

func (NopRevisionReadWriter) Ident() *TableIdent

Ident implements RevisionsReadWriter.TableIdent.

func (NopRevisionReadWriter) ReadRevision added in v0.6.0 

func (NopRevisionReadWriter) ReadRevision(context.Context, string) (*Revision, error)

ReadRevision implements RevisionsReadWriter.ReadRevision.

func (NopRevisionReadWriter) ReadRevisions added in v0.4.2 

func (NopRevisionReadWriter) ReadRevisions(context.Context) ([]*Revision, error)

ReadRevisions implements RevisionsReadWriter.ReadRevisions.

func (NopRevisionReadWriter) WriteRevision added in v0.4.2 

func (NopRevisionReadWriter) WriteRevision(context.Context, *Revision) error

WriteRevision implements RevisionsReadWriter.WriteRevision.

type NotCleanError added in v0.5.0 

type NotCleanError struct {
	Reason string // reason why the database is considered not clean
}

NotCleanError is returned when the connected dev-db is not in a clean state (aka it has schemas and tables). This check is done to ensure no data is lost by overriding it when working on the dev-db.

func (*NotCleanError) Error added in v0.5.0 

func (e *NotCleanError) Error() string

type Plan 

type Plan struct {
	// Version and Name of the plan. Provided by the user or auto-generated.
	Version, Name string

	// Reversible describes if the changeset is reversible.
	Reversible bool

	// Transactional describes if the changeset is transactional.
	Transactional bool

	// Changes defines the list of changeset in the plan.
	Changes []*Change
}

A Plan defines a planned changeset that its execution brings the database to the new desired state. Additional information is calculated by the different drivers to indicate if the changeset is transactional (can be rolled-back) and reversible (a down file can be generated to it).

type PlanApplier 

type PlanApplier interface {
	// PlanChanges returns a migration plan for applying the given changeset.
	PlanChanges(context.Context, string, []schema.Change, ...PlanOption) (*Plan, error)

	// ApplyChanges is responsible for applying the given changeset.
	// An error may return from ApplyChanges if the driver is unable
	// to execute a change.
	ApplyChanges(context.Context, []schema.Change, ...PlanOption) error
}

PlanApplier wraps the methods for planning and applying changes on the database.

type PlanOption added in v0.6.0 

type PlanOption func(*PlanOptions)

PlanOption allows configuring a drivers' plan using functional arguments.

type PlanOptions added in v0.6.0 

type PlanOptions struct {
	// PlanWithSchemaQualifier allows setting a custom schema to prefix
	// tables and other resources. An empty string indicates no qualifier.
	SchemaQualifier *string
	// Indent is the string to use for indentation.
	// If empty, no indentation is used.
	Indent string
}

PlanOptions holds the migration plan options to be used by PlanApplier.

type Planner added in v0.3.4 

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

Planner can plan the steps to take to migrate from one state to another. It uses the enclosed Dir to write those changes to versioned migration files.

func NewPlanner added in v0.3.7 

func NewPlanner(drv Driver, dir Dir, opts ...PlannerOption) *Planner

NewPlanner creates a new Planner.

func (*Planner) Plan added in v0.3.4 

func (p *Planner) Plan(ctx context.Context, name string, to StateReader) (*Plan, error)

Plan calculates the migration Plan required for moving the current state (from) state to the next state (to). A StateReader can be a directory, static schema elements or a Driver connection.

func (*Planner) PlanSchema added in v0.6.0 

func (p *Planner) PlanSchema(ctx context.Context, name string, to StateReader) (*Plan, error)

PlanSchema is like Plan but limits its scope to the schema connection. Note, the operation fails in case the connection was not set to a schema.

func (*Planner) WritePlan added in v0.3.4 

func (p *Planner) WritePlan(plan *Plan) error

WritePlan writes the given Plan to the Dir based on the configured Formatter.

type PlannerOption added in v0.3.7 

type PlannerOption func(*Planner)

PlannerOption allows managing a Planner using functional arguments.

func PlanFormat added in v0.6.0 

func PlanFormat(fmt Formatter) PlannerOption

PlanFormat sets the Formatter of a Planner.

func PlanWithChecksum added in v0.6.0 

func PlanWithChecksum(b bool) PlannerOption

PlanWithChecksum allows setting if the hash-sum functionality for the migration directory is enabled or not.

func PlanWithDiffOptions added in v0.11.0 

func PlanWithDiffOptions(opts ...schema.DiffOption) PlannerOption

PlanWithDiffOptions allows setting custom diff options.

func PlanWithIndent added in v0.10.0 

func PlanWithIndent(indent string) PlannerOption

PlanWithIndent allows generating SQL statements with indentation. An empty string indicates no indentation.

func PlanWithSchemaQualifier added in v0.6.0 

func PlanWithSchemaQualifier(q string) PlannerOption

PlanWithSchemaQualifier allows setting a custom schema to prefix tables and other resources. An empty string indicates no prefix.

Note, this options require the changes to be scoped to one schema and returns an error otherwise.

type ReplayOption added in v0.8.0 

type ReplayOption func(*replayConfig)

ReplayOption configures a migration directory replay behavior.

func ReplayToVersion added in v0.8.0 

func ReplayToVersion(v string) ReplayOption

ReplayToVersion configures the last version to apply when replaying the migration directory.

type RestoreFunc added in v0.5.0 

type RestoreFunc func(context.Context) error

RestoreFunc is returned by the Snapshoter to explicitly restore the database state.

type Revision added in v0.3.8 

type Revision struct {
	Version         string        `json:"Version"`             // Version of the migration.
	Description     string        `json:"Description"`         // Description of this migration.
	Type            RevisionType  `json:"Type"`                // Type of the migration.
	Applied         int           `json:"Applied"`             // Applied amount of statements in the migration.
	Total           int           `json:"Total"`               // Total amount of statements in the migration.
	ExecutedAt      time.Time     `json:"ExecutedAt"`          // ExecutedAt is the starting point of execution.
	ExecutionTime   time.Duration `json:"ExecutionTime"`       // ExecutionTime of the migration.
	Error           string        `json:"Error,omitempty"`     // Error of the migration, if any occurred.
	ErrorStmt       string        `json:"ErrorStmt,omitempty"` // ErrorStmt is the statement that raised Error.
	Hash            string        `json:"-"`                   // Hash of migration file.
	PartialHashes   []string      `json:"-"`                   // PartialHashes is the hashes of applied statements.
	OperatorVersion string        `json:"OperatorVersion"`     // OperatorVersion that executed this migration.
}

A Revision denotes an applied migration in a deployment. Used to track migration executions state of a database.

type RevisionReadWriter added in v0.3.8 

type RevisionReadWriter interface {
	// Ident returns an object identifies this history table.
	Ident() *TableIdent
	// ReadRevisions returns all revisions.
	ReadRevisions(context.Context) ([]*Revision, error)
	// ReadRevision returns a revision by version.
	// Returns ErrRevisionNotExist if the version does not exist.
	ReadRevision(context.Context, string) (*Revision, error)
	// WriteRevision saves the revision to the storage.
	WriteRevision(context.Context, *Revision) error
	// DeleteRevision deletes a revision by version from the storage.
	DeleteRevision(context.Context, string) error
}

A RevisionReadWriter wraps the functionality for reading and writing migration revisions in a database table.

type RevisionType added in v0.6.0 

type RevisionType uint

RevisionType defines the type of the revision record in the history table. 

const (
	// RevisionTypeUnknown represents an unknown revision type.
	// This type is unexpected and exists here to only ensure
	// the type is not set to the zero value.
	RevisionTypeUnknown RevisionType = 0

	// RevisionTypeBaseline represents a baseline revision. Note that only
	// the first record can represent a baseline migration and most of its
	// fields are set to the zero value.
	RevisionTypeBaseline RevisionType = 1 << (iota - 1)

	// RevisionTypeExecute represents a migration that was executed.
	RevisionTypeExecute

	// RevisionTypeResolved represents a migration that was resolved. A migration
	// script that was script executed and then resolved should set its Type to
	// RevisionTypeExecute | RevisionTypeResolved.
	RevisionTypeResolved
)

func (RevisionType) Has added in v0.8.0 

func (r RevisionType) Has(f RevisionType) bool

Has returns if the given flag is set.

func (RevisionType) MarshalText added in v0.8.0 

func (r RevisionType) MarshalText() ([]byte, error)

MarshalText implements encoding.TextMarshaler.

func (RevisionType) String added in v0.8.0 

func (r RevisionType) String() string

String implements fmt.Stringer.

type Snapshoter added in v0.5.0 

type Snapshoter interface {
	// Snapshot takes a snapshot of the current database state and returns a function that can be called to restore
	// that state. Snapshot should return an error, if the current state can not be restored completely, e.g. if
	// there is a table already containing some rows.
	Snapshot(context.Context) (RestoreFunc, error)
}

Snapshoter wraps the Snapshot method.

type StateReader 

type StateReader interface {
	ReadState(ctx context.Context) (*schema.Realm, error)
}

StateReader wraps the method for reading a database/schema state. The types below provides a few builtin options for reading a state from a migration directory, a static object (e.g. a parsed file).

func Realm 

func Realm(r *schema.Realm) StateReader

Realm returns a StateReader for the static Realm object.

func RealmConn added in v0.6.0 

func RealmConn(drv Driver, opts *schema.InspectRealmOption) StateReader

RealmConn returns a StateReader for a Driver connected to a database.

func Schema 

func Schema(s *schema.Schema) StateReader

Schema returns a StateReader for the static Schema object.

func SchemaConn added in v0.6.0 

func SchemaConn(drv Driver, name string, opts *schema.InspectOptions) StateReader

SchemaConn returns a StateReader for a Driver connected to a schema.

type StateReaderFunc 

type StateReaderFunc func(ctx context.Context) (*schema.Realm, error)

The StateReaderFunc type is an adapter to allow the use of ordinary functions as state readers.

func (StateReaderFunc) ReadState 

func (f StateReaderFunc) ReadState(ctx context.Context) (*schema.Realm, error)

ReadState calls f(ctx).

type Stmt added in v0.6.4 

type Stmt struct {
	Pos      int      // statement position
	Text     string   // statement text
	Comments []string // associated comments
}

Stmt represents a scanned statement text along with its position in the file and associated comments group.

func Stmts added in v0.7.1 

func Stmts(input string) ([]*Stmt, error)

Stmts provides a generic implementation for extracting SQL statements from the given file contents.

func (*Stmt) Directive added in v0.6.5 

func (s *Stmt) Directive(name string) (ds []string)

Directive returns all directive comments with the given name. See: pkg.go.dev/cmd/compile#hdr-Compiler_Directives.

type TableIdent added in v0.6.0 

type TableIdent struct {
	Name   string // name of the table.
	Schema string // optional schema.
}

TableIdent describes a table identifier returned by the revisions table.

type TemplateFormatter added in v0.3.4 

type TemplateFormatter []struct{ N, C *template.Template }

TemplateFormatter implements Formatter by using templates.

func NewTemplateFormatter added in v0.3.4 

func NewTemplateFormatter(templates ...*template.Template) (TemplateFormatter, error)

NewTemplateFormatter creates a new Formatter working with the given templates. 

migrate.NewTemplateFormatter(
	template.Must(template.New("").Parse("{{now.Unix}}{{.Name}}.sql")),                 // name template
	template.Must(template.New("").Parse("{{range .Changes}}{{println .Cmd}}{{end}}")), // content template
)

func (TemplateFormatter) Format added in v0.3.4 

func (t TemplateFormatter) Format(plan *Plan) ([]File, error)

Format implements the Formatter interface.

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