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 (
	// ActiveSessionsColumns holds the columns for the "active_sessions" table.
	ActiveSessionsColumns = []*schema.Column{
		{Name: "id", Type: field.TypeInt, Increment: true},
		{Name: "session_id", Type: field.TypeString, Unique: true},
		{Name: "exchange", Type: field.TypeString},
		{Name: "symbol", Type: field.TypeString},
		{Name: "timeframe", Type: field.TypeEnum, Enums: []string{"10s", "1m", "5m", "1d"}},
		{Name: "enabled", Type: field.TypeBool, Default: false},
		{Name: "created_at", Type: field.TypeTime},
		{Name: "updated_at", Type: field.TypeTime},
	}
	// ActiveSessionsTable holds the schema information for the "active_sessions" table.
	ActiveSessionsTable = &schema.Table{
		Name:       "active_sessions",
		Columns:    ActiveSessionsColumns,
		PrimaryKey: []*schema.Column{ActiveSessionsColumns[0]},
	}
	// CandlesColumns holds the columns for the "candles" table.
	CandlesColumns = []*schema.Column{
		{Name: "id", Type: field.TypeInt, Increment: true},
		{Name: "exchange", Type: field.TypeString},
		{Name: "symbol", Type: field.TypeString},
		{Name: "timeframe", Type: field.TypeEnum, Enums: []string{"10s", "1m", "5m", "1d"}},
		{Name: "timestamp", Type: field.TypeInt64},
		{Name: "open", Type: field.TypeFloat64},
		{Name: "high", Type: field.TypeFloat64},
		{Name: "low", Type: field.TypeFloat64},
		{Name: "close", Type: field.TypeFloat64},
		{Name: "volume", Type: field.TypeFloat64},
		{Name: "created_at", Type: field.TypeTime},
	}
	// CandlesTable holds the schema information for the "candles" table.
	CandlesTable = &schema.Table{
		Name:       "candles",
		Columns:    CandlesColumns,
		PrimaryKey: []*schema.Column{CandlesColumns[0]},
		Indexes: []*schema.Index{
			{
				Name:    "candle_exchange_symbol",
				Unique:  false,
				Columns: []*schema.Column{CandlesColumns[1], CandlesColumns[2]},
			},
			{
				Name:    "candle_timestamp",
				Unique:  false,
				Columns: []*schema.Column{CandlesColumns[4]},
			},
			{
				Name:    "candle_exchange_symbol_timeframe_timestamp",
				Unique:  true,
				Columns: []*schema.Column{CandlesColumns[1], CandlesColumns[2], CandlesColumns[3], CandlesColumns[4]},
			},
		},
	}
	// Tables holds all the tables in the schema.
	Tables = []*schema.Table{
		ActiveSessionsTable,
		CandlesTable,
	}
)

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)
}