migrate

Documentation

Index

• Variables
• func Create(ctx context.Context, s *Schema, tables []*schema.Table, ...) error
• type Schema
  • func NewSchema(drv dialect.Driver) *Schema
  • func (s *Schema) Create(ctx context.Context, opts ...schema.MigrateOption) error
  • func (s *Schema) WriteTo(ctx context.Context, w io.Writer, opts ...schema.MigrateOption) error

Variables

var (
	// WithGlobalUniqueID sets the universal ids options to the migration.
	// If this option is enabled, ent migration will allocate a 1<<32 range
	// for the ids of each entity (table).
	// Note that this option cannot be applied on tables that already exist.
	WithGlobalUniqueID = schema.WithGlobalUniqueID
	// WithDropColumn sets the drop column option to the migration.
	// If this option is enabled, ent migration will drop old columns
	// that were used for both fields and edges. This defaults to false.
	WithDropColumn = schema.WithDropColumn
	// WithDropIndex sets the drop index option to the migration.
	// If this option is enabled, ent migration will drop old indexes
	// that were defined in the schema. This defaults to false.
	// Note that unique constraints are defined using `UNIQUE INDEX`,
	// and therefore, it's recommended to enable this option to get more
	// flexibility in the schema changes.
	WithDropIndex = schema.WithDropIndex
	// WithForeignKeys enables creating foreign-key in schema DDL. This defaults to true.
	WithForeignKeys = schema.WithForeignKeys
)

var (
	// DepartmentsColumns holds the columns for the "departments" table.
	DepartmentsColumns = []*schema.Column{
		{Name: "id", Type: field.TypeInt, Increment: true},
		{Name: "dept_name", Type: field.TypeString, Unique: true, SchemaType: map[string]string{"mysql": "varchar(40)"}},
		{Name: "created_at", Type: field.TypeTime, SchemaType: map[string]string{"mysql": "datetime"}},
		{Name: "updated_at", Type: field.TypeTime, SchemaType: map[string]string{"mysql": "datetime"}},
	}
	// DepartmentsTable holds the schema information for the "departments" table.
	DepartmentsTable = &schema.Table{
		Name:       "departments",
		Columns:    DepartmentsColumns,
		PrimaryKey: []*schema.Column{DepartmentsColumns[0]},
	}
	// DeptManagersColumns holds the columns for the "dept_managers" table.
	DeptManagersColumns = []*schema.Column{
		{Name: "id", Type: field.TypeInt, Increment: true},
		{Name: "from_date", Type: field.TypeTime, SchemaType: map[string]string{"mysql": "date"}},
		{Name: "to_date", Type: field.TypeTime, SchemaType: map[string]string{"mysql": "date"}},
		{Name: "created_at", Type: field.TypeTime, SchemaType: map[string]string{"mysql": "datetime"}},
		{Name: "updated_at", Type: field.TypeTime, SchemaType: map[string]string{"mysql": "datetime"}},
		{Name: "department_dept_manager", Type: field.TypeInt},
		{Name: "employee_dept_manager", Type: field.TypeInt},
	}
	// DeptManagersTable holds the schema information for the "dept_managers" table.
	DeptManagersTable = &schema.Table{
		Name:       "dept_managers",
		Columns:    DeptManagersColumns,
		PrimaryKey: []*schema.Column{DeptManagersColumns[0]},
		ForeignKeys: []*schema.ForeignKey{
			{
				Symbol:     "dept_managers_departments_dept_manager",
				Columns:    []*schema.Column{DeptManagersColumns[5]},
				RefColumns: []*schema.Column{DepartmentsColumns[0]},
				OnDelete:   schema.NoAction,
			},
			{
				Symbol:     "dept_managers_employees_dept_manager",
				Columns:    []*schema.Column{DeptManagersColumns[6]},
				RefColumns: []*schema.Column{EmployeesColumns[0]},
				OnDelete:   schema.NoAction,
			},
		},
	}
	// EmployeesColumns holds the columns for the "employees" table.
	EmployeesColumns = []*schema.Column{
		{Name: "id", Type: field.TypeInt, Increment: true},
		{Name: "birth_date", Type: field.TypeTime, SchemaType: map[string]string{"mysql": "date"}},
		{Name: "first_name", Type: field.TypeString, SchemaType: map[string]string{"mysql": "varchar(14)"}},
		{Name: "last_name", Type: field.TypeString, SchemaType: map[string]string{"mysql": "varchar(16)"}},
		{Name: "gender", Type: field.TypeEnum, Enums: []string{"M", "F"}},
		{Name: "hire_date", Type: field.TypeTime, SchemaType: map[string]string{"mysql": "date"}},
		{Name: "created_at", Type: field.TypeTime, SchemaType: map[string]string{"mysql": "datetime"}},
		{Name: "updated_at", Type: field.TypeTime, SchemaType: map[string]string{"mysql": "datetime"}},
		{Name: "deleted_at", Type: field.TypeTime, Nullable: true, SchemaType: map[string]string{"mysql": "datetime"}},
	}
	// EmployeesTable holds the schema information for the "employees" table.
	EmployeesTable = &schema.Table{
		Name:       "employees",
		Columns:    EmployeesColumns,
		PrimaryKey: []*schema.Column{EmployeesColumns[0]},
	}
	// Tables holds all the tables in the schema.
	Tables = []*schema.Table{
		DepartmentsTable,
		DeptManagersTable,
		EmployeesTable,
	}
)

Functions

func Create

func Create(ctx context.Context, s *Schema, tables []*schema.Table, opts ...schema.MigrateOption) error

Create creates all table resources using the given schema driver.

Types

type Schema

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

Schema is the API for creating, migrating and dropping a schema.

func NewSchema

func NewSchema(drv dialect.Driver) *Schema

NewSchema creates a new schema client.

func (*Schema) Create

func (s *Schema) Create(ctx context.Context, opts ...schema.MigrateOption) error

Create creates all schema resources.

func (*Schema) WriteTo

func (s *Schema) WriteTo(ctx context.Context, w io.Writer, opts ...schema.MigrateOption) error

WriteTo writes the schema changes to w instead of running them against the database.

if err := client.Schema.WriteTo(context.Background(), os.Stdout); err != nil {
	log.Fatal(err)
}