Documentation
¶
Overview ¶
Package schema contains all schema migration logic for SQL dialects.
Index ¶
Constants ¶
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 )
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 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.
// contains filtered or unexported fields
}
Column schema definition for SQL dialects.
func (*Column) ConvertibleTo ¶
ConvertibleTo reports whether a column can be converted to the new column without altering its data.
func (*Column) PrimaryKey ¶
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 ¶
ScanDefault scans the default value string to its interface type.
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 Index ¶
type Index struct {
Name string // index name.
Unique bool // uniqueness.
Columns []*Column // actual table columns.
// 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 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 ¶
Create creates all schema resources in the database. It works in an "append-only" mode, which means, it only create tables, append column to tables or modifying column type.
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(*Migrate)
MigrateOption allows for managing schema configuration using functional options.
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 true.
func WithGlobalUniqueID ¶
func WithGlobalUniqueID(b bool) MigrateOption
WithGlobalUniqueID sets the universal ids options to the migration. Defaults to false.
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 Table ¶
type Table struct {
Name string
Columns []*Column
Indexes []*Index
PrimaryKey []*Column
ForeignKeys []*ForeignKey
// contains filtered or unexported fields
}
Table schema definition for SQL dialects.
func (*Table) AddForeignKey ¶
func (t *Table) AddForeignKey(fk *ForeignKey) *Table
AddForeignKey adds a foreign key to the table.
func (*Table) AddPrimary ¶
AddPrimary adds a new primary key to 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.
Source Files