schema

package
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 Go to latest Published: Dec 13, 2023 License: Apache-2.0 Imports: 28 Imported by: 0

Documentation

Overview

Package schema contains all schema migration logic for SQL dialects.

Index

Constants

View Source 
const (
	// ModeReplay computes the current state by replaying the migration directory on the connected database.
	ModeReplay = iota
	// ModeInspect computes the current state by inspecting the connected database.
	ModeInspect
)
View Source 
const (
	// TypeTable defines the table name holding the type information.
	TypeTable = "ent_types"

	// MaxTypes defines the max number of types can be created when
	// defining universal ids. The left 16-bits are reserved.
	MaxTypes = math.MaxUint16
)
View Source 
const (
	// DefaultStringLen describes the default length for string/varchar types.
	DefaultStringLen int64 = 255
	// Null is the string representation of NULL in SQL.
	Null = "NULL"
	// PrimaryKey is the string representation of PKs in SQL.
	PrimaryKey = "PRI"
	// UniqueKey is the string representation of PKs in SQL.
	UniqueKey = "UNI"
)

Variables

This section is empty.

Functions

func Diff 

func Diff(ctx context.Context, u, name string, tables []*Table, opts ...MigrateOption) (err error)

Diff compares the state read from a database connection or migration directory with the state defined by the Ent schema. Changes will be written to new migration files.

Types

type Applier 

type Applier interface {
	// Apply applies the given migrate.Plan on the database.
	Apply(context.Context, dialect.ExecQuerier, *migrate.Plan) error
}

Applier is the interface that wraps the Apply method.

type ApplyFunc 

type ApplyFunc func(context.Context, dialect.ExecQuerier, *migrate.Plan) error

The ApplyFunc type is an adapter to allow the use of ordinary function as Applier. If f is a function with the appropriate signature, ApplyFunc(f) is an Applier that calls f.

func (ApplyFunc) Apply 

func (f ApplyFunc) Apply(ctx context.Context, conn dialect.ExecQuerier, plan *migrate.Plan) error

Apply calls f(ctx, tables...).

type ApplyHook 

type ApplyHook func(Applier) Applier

ApplyHook defines the "migration applying middleware". A function that gets an Applier and returns an Applier.

type Atlas 

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

Atlas atlas migration engine.

func NewMigrate 

func NewMigrate(drv dialect.Driver, opts ...MigrateOption) (*Atlas, error)

NewMigrate creates a new Atlas form the given dialect.Driver.

func NewMigrateURL 

func NewMigrateURL(u string, opts ...MigrateOption) (*Atlas, error)

NewMigrateURL create a new Atlas from the given url.

func (*Atlas) Create 

func (a *Atlas) Create(ctx context.Context, tables ...*Table) (err error)

Create creates all schema resources in the database. It works in an "append-only" mode, which means, it only creates tables, appends columns to tables or modifies column types.

Column can be modified by turning into a NULL from NOT NULL, or having a type conversion not resulting data altering. From example, changing varchar(255) to varchar(120) is invalid, but changing varchar(120) to varchar(255) is valid. For more info, see the convert function below.

func (*Atlas) Diff 

func (a *Atlas) Diff(ctx context.Context, tables ...*Table) error

Diff compares the state read from the connected database with the state defined by Ent. Changes will be written to migration files by the configured Planner.

func (*Atlas) NamedDiff 

func (a *Atlas) NamedDiff(ctx context.Context, name string, tables ...*Table) error

NamedDiff compares the state read from the connected database with the state defined by Ent. Changes will be written to migration files by the configured Planner.

func (*Atlas) StateReader 

func (a *Atlas) StateReader(tables ...*Table) migrate.StateReaderFunc

StateReader returns an atlas migrate.StateReader returning the state as described by the Ent table slice.

func (*Atlas) VerifyTableRange 

func (a *Atlas) VerifyTableRange(ctx context.Context, tables []*Table) error

VerifyTableRange ensures, that the defined autoincrement starting value is set for each table as defined by the TypTable. This is necessary for MySQL versions < 8.0. In those versions the defined starting value for AUTOINCREMENT columns was stored in memory, and when a server restarts happens and there are no rows yet in a table, the defined starting value is lost, which will result in incorrect behavior when working with global unique ids. Calling this method on service start ensures the information are correct and are set again, if they aren't. For MySQL versions > 8 calling this method is only required once after the upgrade.

type ChangeKind 

type ChangeKind uint

A ChangeKind denotes the kind of schema change. 

const (
	NoChange  ChangeKind = 0
	AddSchema ChangeKind = 1 << (iota - 1)
	ModifySchema
	DropSchema
	AddTable
	ModifyTable
	DropTable
	AddColumn
	ModifyColumn
	DropColumn
	AddIndex
	ModifyIndex
	DropIndex
	AddForeignKey
	ModifyForeignKey
	DropForeignKey
	AddCheck
	ModifyCheck
	DropCheck
)

List of change types.

func (ChangeKind) Is 

func (k ChangeKind) Is(c ChangeKind) bool

Is reports whether c is match the given change kind.

type Column 

type Column struct {
	Name       string            // column name.
	Type       field.Type        // column type.
	SchemaType map[string]string // optional schema type per dialect.
	Attr       string            // extra attributes.
	Size       int64             // max size parameter for string, blob, etc.
	Key        string            // key definition (PRI, UNI or MUL).
	Unique     bool              // column with unique constraint.
	Increment  bool              // auto increment attribute.
	Nullable   bool              // null or not null attribute.
	Default    any               // default value.
	Enums      []string          // enum values.
	Collation  string            // collation type (utf8mb4_unicode_ci, utf8mb4_general_ci)

	Comment string // optional column comment.
	// contains filtered or unexported fields
}

Column schema definition for SQL dialects.

func (*Column) ConvertibleTo 

func (c *Column) ConvertibleTo(d *Column) bool

ConvertibleTo reports whether a column can be converted to the new column without altering its data.

func (Column) FloatType 

func (c Column) FloatType() bool

FloatType reports of the given type is a float type (float32, float64).

func (Column) IntType 

func (c Column) IntType() bool

IntType reports whether the column is an int type (int8 ... int64).

func (*Column) PrimaryKey 

func (c *Column) PrimaryKey() bool

PrimaryKey returns boolean indicates if this column is on of the primary key columns. Used by the migration tool when parsing the `DESCRIBE TABLE` output Go objects.

func (*Column) ScanDefault 

func (c *Column) ScanDefault(value string) error

ScanDefault scans the default value string to its interface type.

func (Column) UintType 

func (c Column) UintType() bool

UintType reports of the given type is a uint type (int8 ... int64).

func (*Column) UniqueKey 

func (c *Column) UniqueKey() bool

UniqueKey returns boolean indicates if this column is a unique key. Used by the migration tool when parsing the `DESCRIBE TABLE` output Go objects.

type CreateFunc 

type CreateFunc func(context.Context, ...*Table) error

The CreateFunc type is an adapter to allow the use of ordinary function as Creator. If f is a function with the appropriate signature, CreateFunc(f) is a Creator that calls f.

func (CreateFunc) Create 

func (f CreateFunc) Create(ctx context.Context, tables ...*Table) error

Create calls f(ctx, tables...).

type Creator 

type Creator interface {
	// Create creates the given tables in the database. See Migrate.Create for more details.
	Create(context.Context, ...*Table) error
}

Creator is the interface that wraps the Create method.

type DiffFunc 

type DiffFunc func(current, desired *schema.Schema) ([]schema.Change, error)

The DiffFunc type is an adapter to allow the use of ordinary function as Differ. If f is a function with the appropriate signature, DiffFunc(f) is a Differ that calls f.

func (DiffFunc) Diff 

func (f DiffFunc) Diff(current, desired *schema.Schema) ([]schema.Change, error)

Diff calls f(current, desired).

type DiffHook 

type DiffHook func(Differ) Differ

DiffHook defines the "diff middleware". A function that gets a Differ and returns a Differ.

type Differ 

type Differ interface {
	// Diff returns a list of changes that construct a migration plan.
	Diff(current, desired *schema.Schema) ([]schema.Change, error)
}

Differ is the interface that wraps the Diff method.

type DirWriter 

type DirWriter struct {
	Dir       migrate.Dir       // target directory.
	Formatter migrate.Formatter // optional formatter.
	// contains filtered or unexported fields
}

DirWriter implements the io.Writer interface for writing to an Atlas managed directory.

func (*DirWriter) Change 

func (d *DirWriter) Change(comment string)

Change converts all written statement so far into a migration change with the given comment.

func (*DirWriter) Flush 

func (d *DirWriter) Flush(name string) error

Flush flushes the written statements to the directory.

func (*DirWriter) FlushChange 

func (d *DirWriter) FlushChange(name, comment string) error

FlushChange combines Change and Flush.

func (*DirWriter) Write 

func (d *DirWriter) Write(p []byte) (int, error)

Write implements the io.Writer interface.

type Expr 

type Expr string

Expr represents a raw expression. It is used to distinguish between literal values and raw expressions when defining default values.

type ForeignKey 

type ForeignKey struct {
	Symbol     string          // foreign-key name. Generated if empty.
	Columns    []*Column       // table column
	RefTable   *Table          // referenced table.
	RefColumns []*Column       // referenced columns.
	OnUpdate   ReferenceOption // action on update.
	OnDelete   ReferenceOption // action on delete.
}

ForeignKey definition for creation.

func (ForeignKey) DSL 

func (fk ForeignKey) DSL() *sql.ForeignKeyBuilder

DSL returns a default DSL query for a foreign-key.

type Hook 

type Hook func(Creator) Creator

Hook defines the "create middleware". A function that gets a Creator and returns a Creator. For example: 

hook := func(next schema.Creator) schema.Creator {
	return schema.CreateFunc(func(ctx context.Context, tables ...*schema.Table) error {
		fmt.Println("Tables:", tables)
		return next.Create(ctx, tables...)
	})
}

type Index 

type Index struct {
	Name       string                  // index name.
	Unique     bool                    // uniqueness.
	Columns    []*Column               // actual table columns.
	Annotation *entsql.IndexAnnotation // index annotation.
	// contains filtered or unexported fields
}

Index definition for table index.

func (*Index) Builder 

func (i *Index) Builder(table string) *sql.IndexBuilder

Builder returns the query builder for index creation. The DSL is identical in all dialects.

func (*Index) DropBuilder 

func (i *Index) DropBuilder(table string) *sql.DropIndexBuilder

DropBuilder returns the query builder for the drop index.

type Indexes 

type Indexes []*Index

Indexes used for scanning all sql.Rows into a list of indexes, because multiple sql rows can represent the same index (multi-columns indexes).

type InspectOption 

type InspectOption func(inspect *Inspector)

InspectOption allows for managing schema configuration using functional options.

func WithSchema 

func WithSchema(schema string) InspectOption

WithSchema provides a schema (named-database) for reading the tables from.

type Inspector 

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

An Inspector provides methods for inspecting database tables.

func NewInspect 

func NewInspect(d dialect.Driver, opts ...InspectOption) (*Inspector, error)

NewInspect returns an inspector for the given SQL driver.

func (*Inspector) Tables 

func (i *Inspector) Tables(ctx context.Context) ([]*Table, error)

Tables returns the tables in the schema.

type Migrate deprecated 

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

Migrate runs the migration logic for the SQL dialects.

Deprecated: Use the new Atlas struct instead.

func (*Migrate) Create 

func (m *Migrate) Create(ctx context.Context, tables ...*Table) error

Create creates all schema resources in the database. It works in an "append-only" mode, which means, it only creates tables, appends columns to tables or modifies column types.

Column can be modified by turning into a NULL from NOT NULL, or having a type conversion not resulting data altering. From example, changing varchar(255) to varchar(120) is invalid, but changing varchar(120) to varchar(255) is valid. For more info, see the convert function below.

Note that SQLite dialect does not support (this moment) the "append-only" mode describe above, since it's used only for testing.

type MigrateOption 

type MigrateOption func(*Atlas)

MigrateOption allows configuring Atlas using functional arguments.

func DisableChecksum deprecated 

func DisableChecksum() MigrateOption

DisableChecksum instructs atlas to skip migration directory integrity sum file generation.

Deprecated: generating the sum file will no longer be optional in future versions.

func WithApplyHook 

func WithApplyHook(hooks ...ApplyHook) MigrateOption

WithApplyHook adds a list of ApplyHook to the schema migration. 

schema.WithApplyHook(func(next schema.Applier) schema.Applier {
	return schema.ApplyFunc(func(ctx context.Context, conn dialect.ExecQuerier, plan *migrate.Plan) error {
		// Example to hook into the apply process, or implement
		// a custom applier.
		//
		//	for _, c := range plan.Changes {
		//		fmt.Printf("%s: %s", c.Comment, c.Cmd)
		//	}
		//
		return next.Apply(ctx, conn, plan)
	})
})

func WithAtlas deprecated 

func WithAtlas(b bool) MigrateOption

WithAtlas is an opt-out option for v0.11 indicating the migration should be executed using the deprecated legacy engine. Note, in future versions, this option is going to be removed and the Atlas (https://atlasgo.io) based migration engine should be used.

Deprecated: The legacy engine will be removed.

func WithDialect 

func WithDialect(d string) MigrateOption

WithDialect configures the Ent dialect to use when migrating for an Atlas supported dialect flavor. As an example, Ent can work with TiDB in MySQL dialect and Atlas can handle TiDB migrations.

func WithDiffHook 

func WithDiffHook(hooks ...DiffHook) MigrateOption

WithDiffHook adds a list of DiffHook to the schema migration. 

schema.WithDiffHook(func(next schema.Differ) schema.Differ {
	return schema.DiffFunc(func(current, desired *atlas.Schema) ([]atlas.Change, error) {
		// Code before standard diff.
		changes, err := next.Diff(current, desired)
		if err != nil {
			return nil, err
		}
		// After diff, you can filter
		// changes or return new ones.
		return changes, nil
	})
})

func WithDiffOptions 

func WithDiffOptions(opts ...schema.DiffOption) MigrateOption

WithDiffOptions adds a list of options to pass to the diff engine.

func WithDir 

func WithDir(dir migrate.Dir) MigrateOption

WithDir sets the atlas migration directory to use to store migration files.

func WithDropColumn 

func WithDropColumn(b bool) MigrateOption

WithDropColumn sets the columns dropping option to the migration. Defaults to false.

func WithDropIndex 

func WithDropIndex(b bool) MigrateOption

WithDropIndex sets the indexes dropping option to the migration. Defaults to false.

func WithErrNoPlan 

func WithErrNoPlan(b bool) MigrateOption

WithErrNoPlan sets Atlas to returns a migrate.ErrNoPlan in case the migration plan is empty. Defaults to false.

func WithFixture deprecated 

func WithFixture(b bool) MigrateOption

WithFixture sets the foreign-key renaming option to the migration when upgrading sqlDialect from v0.1.0 (issue-#285). Defaults to false.

Deprecated: This option is no longer needed with the Atlas based migration engine, which now is the default.

func WithForeignKeys 

func WithForeignKeys(b bool) MigrateOption

WithForeignKeys enables creating foreign-key in ddl. Defaults to true.

func WithFormatter 

func WithFormatter(fmt migrate.Formatter) MigrateOption

WithFormatter sets atlas formatter to use to write changes to migration files.

func WithGlobalUniqueID 

func WithGlobalUniqueID(b bool) MigrateOption

WithGlobalUniqueID sets the universal ids options to the migration. Defaults to false.

func WithHooks 

func WithHooks(hooks ...Hook) MigrateOption

WithHooks adds a list of hooks to the schema migration.

func WithIndent 

func WithIndent(indent string) MigrateOption

WithIndent sets Atlas to generate SQL statements with indentation. An empty string indicates no indentation.

func WithMigrationMode 

func WithMigrationMode(mode Mode) MigrateOption

WithMigrationMode instructs atlas how to compute the current state of the schema. This can be done by either replaying (ModeReplay) the migration directory on the connected database, or by inspecting (ModeInspect) the connection. Currently, ModeReplay is opt-in, and ModeInspect is the default. In future versions, ModeReplay will become the default behavior. This option has no effect when using online migrations.

func WithSkipChanges 

func WithSkipChanges(skip ChangeKind) MigrateOption

WithSkipChanges allows skipping/filtering list of changes returned by the Differ before executing migration planning. 

SkipChanges(schema.DropTable|schema.DropColumn)

func WithSumFile deprecated 

func WithSumFile() MigrateOption

WithSumFile instructs atlas to generate a migration directory integrity sum file.

Deprecated: generating the sum file is now opt-out. This method will be removed in future versions.

type Mode 

type Mode uint

Mode to compute the current state.

type MySQL 

type MySQL struct {
	dialect.Driver
	// contains filtered or unexported fields
}

MySQL is a MySQL migration driver.

type Postgres 

type Postgres struct {
	dialect.Driver
	// contains filtered or unexported fields
}

Postgres is a postgres migration driver.

type ReferenceOption 

type ReferenceOption string

ReferenceOption for constraint actions. 

const (
	NoAction   ReferenceOption = "NO ACTION"
	Restrict   ReferenceOption = "RESTRICT"
	Cascade    ReferenceOption = "CASCADE"
	SetNull    ReferenceOption = "SET NULL"
	SetDefault ReferenceOption = "SET DEFAULT"
)

Reference options.

func (ReferenceOption) ConstName 

func (r ReferenceOption) ConstName() string

ConstName returns the constant name of a reference option. It's used by entc for printing the constant name in templates.

type SQLite 

type SQLite struct {
	dialect.Driver
	WithForeignKeys bool
}

SQLite is an SQLite migration driver.

func (*SQLite) Tx 

func (d *SQLite) Tx(ctx context.Context) (dialect.Tx, error)

Tx implements opens a transaction.

type SQLiteTx 

type SQLiteTx struct {
	dialect.Tx
	// contains filtered or unexported fields
}

SQLiteTx implements dialect.Tx.

func (*SQLiteTx) Commit 

func (tx *SQLiteTx) Commit() error

Commit ensures foreign keys are toggled back on after commit.

func (*SQLiteTx) Rollback 

func (tx *SQLiteTx) Rollback() error

Rollback ensures foreign keys are toggled back on after rollback.

type Table 

type Table struct {
	Name    string
	Schema  string
	Columns []*Column

	Indexes     []*Index
	PrimaryKey  []*Column
	ForeignKeys []*ForeignKey
	Annotation  *entsql.Annotation
	Comment     string
	// contains filtered or unexported fields
}

Table schema definition for SQL dialects.

func CopyTables 

func CopyTables(tables []*Table) ([]*Table, error)

CopyTables returns a deep-copy of the given tables. This utility function is useful for copying the generated schema tables (i.e. migrate.Tables) before running schema migration when there is a need for execute multiple migrations concurrently. e.g. running parallel unit-tests using the generated enttest package.

func NewTable 

func NewTable(name string) *Table

NewTable returns a new table with the given name.

func NewTypesTable 

func NewTypesTable() *Table

NewTypesTable returns a new table for holding the global-id information.

func (*Table) AddColumn 

func (t *Table) AddColumn(c *Column) *Table

AddColumn adds a new column to the table.

func (*Table) AddForeignKey 

func (t *Table) AddForeignKey(fk *ForeignKey) *Table

AddForeignKey adds a foreign key to the table.

func (*Table) AddIndex 

func (t *Table) AddIndex(name string, unique bool, columns []string) *Table

AddIndex creates and adds a new index to the table from the given options.

func (*Table) AddPrimary 

func (t *Table) AddPrimary(c *Column) *Table

AddPrimary adds a new primary key to the table.

func (*Table) Column 

func (t *Table) Column(name string) (*Column, bool)

Column returns the column with the given name. If exists.

func (*Table) HasColumn 

func (t *Table) HasColumn(name string) bool

HasColumn reports if the table contains a column with the given name.

func (*Table) Index 

func (t *Table) Index(name string) (*Index, bool)

Index returns a table index by its exact name.

func (*Table) SetAnnotation 

func (t *Table) SetAnnotation(ant *entsql.Annotation) *Table

SetAnnotation the entsql.Annotation on the table.

func (*Table) SetComment 

func (t *Table) SetComment(c string) *Table

SetComment sets the table comment.

func (*Table) SetSchema 

func (t *Table) SetSchema(s string) *Table

SetSchema sets the table schema.

type WriteDriver 

type WriteDriver struct {
	dialect.Driver // optional driver for query calls.
	io.Writer      // target for exec statements.
	FormatFunc     func(string) (string, error)
}

WriteDriver is a driver that writes all driver exec operations to its writer. Note that this driver is used only for printing or writing statements to SQL files, and may require manual changes to the generated SQL statements.

func NewWriteDriver 

func NewWriteDriver(dialect string, w io.Writer) *WriteDriver

NewWriteDriver creates a dialect.Driver that writes all driver exec statement to its writer.

func (*WriteDriver) Exec 

func (w *WriteDriver) Exec(_ context.Context, query string, args, res any) error

Exec implements the dialect.Driver.Exec method.

func (*WriteDriver) Query 

func (w *WriteDriver) Query(ctx context.Context, query string, args, res any) error

Query implements the dialect.Driver.Query method.

func (*WriteDriver) Tx 

func (w *WriteDriver) Tx(context.Context) (dialect.Tx, error)

Tx writes the transaction start.

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