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micro--go-micro/model/model.go
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wehub-resource-sync e071084ebe
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chore: import upstream snapshot with attribution
2026-07-13 12:40:33 +08:00

87 lines
3.1 KiB
Go

// Package model is an interface for structured data storage with schema awareness.
package model
import (
"context"
"errors"
)
var (
// ErrNotFound is returned when a record doesn't exist.
ErrNotFound = errors.New("not found")
// ErrDuplicateKey is returned when a record with the same key already exists.
ErrDuplicateKey = errors.New("duplicate key")
// ErrNotRegistered is returned when a table has not been registered.
ErrNotRegistered = errors.New("table not registered")
// DefaultModel is the default model.
DefaultModel Model = NewModel()
)
// Model is a structured data storage interface.
type Model interface {
// Init initializes the model.
Init(...Option) error
// Register registers a struct type as a table.
Register(v interface{}, opts ...RegisterOption) error
// Create inserts a new record. Returns ErrDuplicateKey if key exists.
Create(ctx context.Context, v interface{}) error
// Read retrieves a record by key into v. Returns ErrNotFound if missing.
Read(ctx context.Context, key string, v interface{}) error
// Update modifies an existing record. Returns ErrNotFound if missing.
Update(ctx context.Context, v interface{}) error
// Delete removes a record by key. v is a pointer to the struct type.
Delete(ctx context.Context, key string, v interface{}) error
// List retrieves records matching the query. result must be a pointer to a slice of struct pointers.
List(ctx context.Context, result interface{}, opts ...QueryOption) error
// Count returns the number of matching records. v is a pointer to the struct type.
Count(ctx context.Context, v interface{}, opts ...QueryOption) (int64, error)
// Close closes the model.
Close() error
// String returns the name of the implementation.
String() string
}
type Option func(*Options)
type RegisterOption func(*Schema)
// NewModel returns the default in-memory model.
func NewModel(opts ...Option) Model {
return newMemoryModel(opts...)
}
// Register registers a struct type with the default model.
func Register(v interface{}, opts ...RegisterOption) error {
return DefaultModel.Register(v, opts...)
}
// Create inserts a new record using the default model.
func Create(ctx context.Context, v interface{}) error {
return DefaultModel.Create(ctx, v)
}
// Read retrieves a record by key using the default model.
func Read(ctx context.Context, key string, v interface{}) error {
return DefaultModel.Read(ctx, key, v)
}
// Update modifies an existing record using the default model.
func Update(ctx context.Context, v interface{}) error {
return DefaultModel.Update(ctx, v)
}
// Delete removes a record by key using the default model.
func Delete(ctx context.Context, key string, v interface{}) error {
return DefaultModel.Delete(ctx, key, v)
}
// List retrieves records matching the query using the default model.
func List(ctx context.Context, result interface{}, opts ...QueryOption) error {
return DefaultModel.List(ctx, result, opts...)
}
// Count returns the number of matching records using the default model.
func Count(ctx context.Context, v interface{}, opts ...QueryOption) (int64, error) {
return DefaultModel.Count(ctx, v, opts...)
}