migrate

package
v0.26.0 Latest Latest
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 Go to latest Published: Aug 8, 2024 License: Apache-2.0 Imports: 22 Imported by: 82

Documentation

Index

Constants

View Source 
const HashFileName = "atlas.sum"

HashFileName of the migration directory integrity sum file.

Variables

View Source 
var (
	// ErrNotCheckpoint is returned when calling CheckpointFile methods on a non-checkpoint file.
	ErrNotCheckpoint = errors.New("not a checkpoint file")
	// ErrCheckpointNotFound is returned when a checkpoint file is not found in the directory.
	ErrCheckpointNotFound = errors.New("no checkpoint found")
)
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 when unmarshalling from a sum file and the files sum entries 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: no pending migration files")
	// 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 ArchiveDirTo added in v0.22.0 

func ArchiveDirTo(w io.Writer, dir Dir) error

ArchiveDirTo writes a tar archive of the given directory to the given writer.

func FileStmts added in v0.16.0 

func FileStmts(drv Driver, f File) ([]string, error)

FileStmts is like FileStmtDecls but returns only the statement text without the extra info.

func FilesLastIndex added in v0.6.0 

func FilesLastIndex[F File](files []F, f func(F) 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 NewVersion added in v0.25.0 

func NewVersion() string

NewVersion generates a new migration version.

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 CheckpointDir added in v0.13.2 

type CheckpointDir interface {
	Dir
	// WriteCheckpoint writes the given checkpoint file to the migration directory.
	WriteCheckpoint(name, tag string, content []byte) error

	// CheckpointFiles returns a set of checkpoint files stored in this Dir,
	// ordered by name.
	CheckpointFiles() ([]File, error)

	// FilesFromCheckpoint returns the files to be executed on a database from
	// the given checkpoint file, including it. An ErrCheckpointNotFound if the
	// checkpoint file is not found in the directory.
	FilesFromCheckpoint(string) ([]File, error)
}

CheckpointDir wraps the functionality used to interact with a migration directory that support checkpoints.

type CheckpointFile added in v0.13.2 

type CheckpointFile interface {
	File
	// IsCheckpoint returns true if the file is a checkpoint file.
	IsCheckpoint() bool

	// CheckpointTag returns the tag of the checkpoint file, if defined. The tag
	// can be derived from the file name, internal metadata or directive comments.
	//
	// An ErrNotCheckpoint is returned if the file is not a checkpoint file.
	CheckpointTag() (string, error)
}

CheckpointFile wraps the functionality used to interact with files returned from a CheckpointDir.

type ChecksumError added in v0.19.1 

type ChecksumError struct {
	Line, Total, Pos int    // line number in file of the mismatch, total number of lines, pos in file
	File             string // filename of the mismatch
	Reason           Reason // reason of a mismatch by filename
}

ChecksumError indicates a mismatch between a directories files and its sum.

func (*ChecksumError) Error added in v0.19.1 

func (err *ChecksumError) Error() string

Error implements the error interface.

func (*ChecksumError) Is added in v0.19.1 

func (err *ChecksumError) Is(target error) bool

Is exists for backwards compatability reasons.

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.

func UnarchiveDirFrom added in v0.22.0 

func UnarchiveDirFrom(r io.Reader) (Dir, error)

UnarchiveDirFrom 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 ExecOrder added in v0.16.0 

type ExecOrder uint

ExecOrder defines the execution order to use. 

const (
	// ExecOrderLinear is the default execution order mode.
	// It expects a linear history and fails if it encounters files that were
	// added out of order. For example, a new file was added with version lower
	// than the last applied revision.
	ExecOrderLinear ExecOrder = iota

	// ExecOrderLinearSkip is a softer version of ExecOrderLinear.
	// This means that if a new file is added with a version lower than the last
	// applied revision, it will be skipped.
	ExecOrderLinearSkip

	// ExecOrderNonLinear executes migration files that were added out of order.
	ExecOrderNonLinear
)

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.

func (*Executor) ValidateDir added in v0.19.0 

func (e *Executor) ValidateDir(context.Context) error

ValidateDir before operating on it.

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 WithExecOrder added in v0.16.0 

func WithExecOrder(o ExecOrder) ExecutorOption

WithExecOrder sets the execution order to use.

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.

func FilesFromLastCheckpoint added in v0.13.2 

func FilesFromLastCheckpoint(dir Dir) ([]File, error)

FilesFromLastCheckpoint returns a set of files created after the last checkpoint, if exists, to be executed on a database (on the first time). Note, if the Dir is not a CheckpointDir, or no checkpoint file was found, all files are returned.

func SkipCheckpointFiles added in v0.13.2 

func SkipCheckpointFiles(all []File) []File

SkipCheckpointFiles returns a filtered set of files that are not checkpoint files.

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 HistoryNonLinearError added in v0.16.0 

type HistoryNonLinearError struct {
	// OutOfOrder are the files that were added out of order.
	OutOfOrder []File
	// Pending are valid files that are still pending for execution.
	Pending []File
}

HistoryNonLinearError is returned if the migration history is not linear. Means, a file was added out of order. The executor can be configured to ignore this error and continue execution. See WithExecOrder for details.

func (HistoryNonLinearError) Error added in v0.16.0 

func (e HistoryNonLinearError) 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) CheckpointFiles added in v0.13.2 

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

CheckpointFiles implements CheckpointDir.CheckpointFiles.

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) FilesFromCheckpoint added in v0.13.2 

func (d *LocalDir) FilesFromCheckpoint(name string) ([]File, error)

FilesFromCheckpoint implements CheckpointDir.FilesFromCheckpoint.

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) WriteCheckpoint added in v0.13.2 

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

WriteCheckpoint is like WriteFile, but marks the file as a checkpoint file.

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) AddDirective added in v0.13.2 

func (f *LocalFile) AddDirective(name string, args ...string)

AddDirective adds a new directive to the file.

func (*LocalFile) Bytes added in v0.4.3 

func (f *LocalFile) Bytes() []byte

Bytes returns local file data.

func (*LocalFile) CheckpointTag added in v0.13.2 

func (f *LocalFile) CheckpointTag() (string, error)

CheckpointTag returns the tag of the checkpoint file, if defined.

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) IsCheckpoint added in v0.13.2 

func (f *LocalFile) IsCheckpoint() bool

IsCheckpoint reports whether the file is a checkpoint file.

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 LogCheck added in v0.19.0 

type LogCheck struct {
	Stmt  string // Check statement.
	Error error  // Check error.
}

LogCheck is sent after a specific check statement was executed.

type LogChecks added in v0.19.0 

type LogChecks struct {
	Name  string   // Optional name.
	Stmts []string // Check statements.
}

LogChecks is sent before the execution of a group of check statements.

type LogChecksDone added in v0.19.0 

type LogChecksDone struct {
	Error error // Optional error.
}

LogChecksDone is sent after the execution of a group of checks together with some text message and error if the group failed.

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) CheckpointFiles added in v0.13.2 

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

CheckpointFiles implements CheckpointDir.CheckpointFiles.

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) CopyFiles added in v0.26.0 

func (d *MemDir) CopyFiles(fs []File) error

CopyFiles copies all files to the MemDir and update the atlas.sum file, or create it if it does not exist.

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) FilesFromCheckpoint added in v0.13.2 

func (d *MemDir) FilesFromCheckpoint(name string) ([]File, error)

FilesFromCheckpoint implements CheckpointDir.FilesFromCheckpoint.

func (*MemDir) Open added in v0.9.0 

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

Open implements fs.FS.

func (*MemDir) Reset added in v0.12.1 

func (d *MemDir) Reset()

Reset the in-memory directory to its initial state.

func (*MemDir) SyncWrites added in v0.12.1 

func (d *MemDir) SyncWrites(fs ...func(string, []byte) error)

SyncWrites allows syncing writes from in-memory directory the underlying storage.

func (*MemDir) WriteCheckpoint added in v0.13.2 

func (d *MemDir) WriteCheckpoint(name, tag string, b []byte) error

WriteCheckpoint is like WriteFile, but marks the file as a checkpoint file.

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
	State  *schema.Realm // the state the dev-connection is in
}

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 PlanMode added in v0.12.1 

type PlanMode uint8

PlanMode defines the plan mode to use. 

const (
	PlanModeUnset        PlanMode = iota // Driver default.
	PlanModeInPlace                      // Changes are applied in place (e.g. 'schema diff').
	PlanModeDeferred                     // Changes are planned for future applying (e.g. 'migrate diff').
	PlanModeDump                         // Schema creation dump (e.g. 'schema inspect').
	PlanModeUnsortedDump                 // Schema creation demo without sorting dependencies.
)

List of migration planning modes.

func (PlanMode) Is added in v0.12.1 

func (m PlanMode) Is(m1 PlanMode) bool

Is reports whether m is match the given mode.

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
	// Mode represents the migration planning mode to be used. If not specified, the driver picks its default.
	// This is useful to indicate to the driver whether the context is a live database, an empty one, or the
	// versioned migration workflow.
	Mode PlanMode
}

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 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) Checkpoint added in v0.13.2 

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

Checkpoint calculate the current state of the migration directory by executing its files, and return a migration (checkpoint) Plan that represents its states.

func (*Planner) CheckpointSchema added in v0.13.2 

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

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

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) WriteCheckpoint added in v0.13.2 

func (p *Planner) WriteCheckpoint(plan *Plan, tag string) error

WriteCheckpoint writes the given Plan as a checkpoint file to the Dir based on the configured Formatter.

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 PlanWithMode added in v0.12.1 

func PlanWithMode(m PlanMode) PlannerOption

PlanWithMode allows setting a custom plan mode.

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 Reason added in v0.19.1 

type Reason uint

Reason for a checksum mismatch. 

const (
	ReasonAdded Reason = iota + 1
	ReasonEdited
	ReasonRemoved
)

Reason for a checksum mismatch.

func (Reason) String added in v0.19.1 

func (r Reason) String() string

String implements fmt.Stringer.

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 Scanner added in v0.3.8 

type Scanner struct {
	ScannerOptions
	// contains filtered or unexported fields
}

Scanner scanning SQL statements from migration and schema files.

func (*Scanner) Scan added in v0.16.0 

func (s *Scanner) Scan(input string) ([]*Stmt, error)

Scan scans the statement in the given input.

type ScannerOptions added in v0.16.0 

type ScannerOptions struct {
	// MatchBegin enables matching for BEGIN ... END statements block.
	MatchBegin bool
	// MatchBeginAtomic enables matching for BEGIN ATOMIC ... END statements block.
	MatchBeginAtomic bool
	// MatchDollarQuote enables the PostgreSQL dollar-quoted string syntax.
	MatchDollarQuote bool
	// BackslashEscapes enables backslash-escaped strings. By default, only MySQL/MariaDB uses backslash as
	// an escape character.  https://dev.mysql.com/doc/refman/8.4/en/sql-mode.html#sqlmode_no_backslash_escapes
	BackslashEscapes bool
	// EscapedStringExt enables the supported for PG extension for escaped strings and adopted by its flavors.
	// See: https://www.postgresql.org/docs/current/sql-syntax-lexical.html#SQL-SYNTAX-STRINGS-ESCAPE.
	EscapedStringExt bool
}

ScannerOptions controls the behavior of the scanner.

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 FileStmtDecls added in v0.16.0 

func FileStmtDecls(drv Driver, f File) ([]*Stmt, error)

FileStmtDecls scans atlas-format file statements using the Driver implementation, if implemented.

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 StmtScanner added in v0.16.0 

type StmtScanner interface {
	ScanStmts(input string) ([]*Stmt, error)
}

StmtScanner interface for scanning SQL statements from migration and schema files and can be optionally implemented by drivers.

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.

func (TemplateFormatter) FormatFile added in v0.26.0 

func (t TemplateFormatter) FormatFile(p *Plan) (File, error)

FormatFile is like Format, but expects and returns a single file.

func (TemplateFormatter) FormatTo added in v0.26.0 

func (t TemplateFormatter) FormatTo(plan *Plan, w io.Writer) error

FormatTo calls Format and writes the files' content to the given writer.

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