schema

package
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 Go to latest Published: Apr 12, 2022 License: Apache-2.0 Imports: 20 Imported by: 3

Documentation

Overview

Package schema contains all schema migration logic for SQL dialects.

Index

Constants

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

This section is empty.

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 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    interface{}       // default value.
	Enums      []string          // enum values.
	Collation  string            // collation type (utf8mb4_unicode_ci, utf8mb4_general_ci)
	// 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 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 

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

Migrate runs the migrations logic for the SQL dialects.

func NewMigrate 

func NewMigrate(d dialect.Driver, opts ...MigrateOption) (*Migrate, error)

NewMigrate create a migration structure for the given SQL driver.

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.

func (*Migrate) Diff 

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

Diff compares the state read from the StateReader with the state defined by Ent. Changes will be written to migration files by the configures Planner.

func (*Migrate) NamedDiff 

func (m *Migrate) NamedDiff(ctx context.Context, name string, tables ...*Table) error

NamedDiff compares the state read from the StateReader with the state defined by Ent. Changes will be written to migration files by the configures Planner.

type MigrateOption 

type MigrateOption func(*Migrate)

MigrateOption allows for managing schema configuration using functional options.

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 

func WithAtlas(b bool) MigrateOption

WithAtlas is an opt-in option for v0.10 indicates the migration should be executed using Atlas engine (i.e. https://atlasgo.io). Note, in future versions, this option is going to be replaced from opt-in to opt-out and the deprecation of this package.

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 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 WithFixture 

func WithFixture(b bool) MigrateOption

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

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 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)

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.

type Table 

type Table struct {
	Name    string
	Columns []*Column

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

Table schema definition for SQL dialects.

func NewTable 

func NewTable(name string) *Table

NewTable returns a new table with the given name.

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) 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.

type WriteDriver 

type WriteDriver struct {
	dialect.Driver // underlying driver.
	io.Writer      // target for exec statements.
}

WriteDriver is a driver that writes all driver exec operations to its writer.

func (*WriteDriver) Commit 

func (w *WriteDriver) Commit() error

Commit writes the transaction commit.

func (*WriteDriver) Exec 

func (w *WriteDriver) Exec(_ context.Context, query string, _, _ interface{}) error

Exec writes its query and calls the underlying driver Exec method.

func (*WriteDriver) Rollback 

func (w *WriteDriver) Rollback() error

Rollback writes the transaction rollback.

func (*WriteDriver) Tx 

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

Tx writes the transaction start.

Source Files

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