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Golang database CRUD adapter

License: MIT License

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crudiator's Introduction

crudiator

Supercharge your web backend development with crudiator.

Usage

Define the schema

var (
	studentCrudiator = crudiator.MustNewEditor(
		"students",
		crudiator.POSTGRESQL,
		crudiator.NewField("id", crudiator.IsPrimaryKey, crudiator.IncludeOnRead),
		crudiator.NewField("name", crudiator.IncludeAlways),
		crudiator.NewField("age", crudiator.IncludeAlways),
		crudiator.NewField("created_at", crudiator.IncludeOnCreate, crudiator.IncludeOnRead),
		crudiator.NewField("updated_at", crudiator.IncludeOnUpdate, crudiator.IncludeOnRead),
		crudiator.NewField("school_id", crudiator.IncludeOnCreate, crudiator.IncludeOnRead, crudiator.IsSelectionFilter),
	).SoftDelete(true, "deleted_at").
		MustPaginate(crudiator.KEYSET, "id").
		Build()
)

studentCrudiator can be used concurrently since it does not store any state data.

Call the CRUD functions by passing two things:
- a form from which to pull values from
- the *sql.DB handle to write and read values from.

studentCrudiator.Create(form, db)

Refer to tests for additional use cases

Pagination

Pagination is supported when reading data.

The following pagination strategies are implemented:

Offset pagination - Uses OFFSET and LIMIT which allows skipping to specific offsets. However, as the size of data grows, it becomes significally slow since the entire table needs to be scanned in order to determine the offset.
Keyset pagination - Utilizses an index to prevent full table scan. Implementation at the moment uses the following since most tables will have numeric keys:

WHERE indexedColumn > :lastIndexColumnValue:
ORDER BY indexedColumn ASC
FETCH NEXT 200 ROWS ONLY;

:lastIndexColumnValue: is the value of the previous value, initially 0, which automatically will return the first 200 rows.

The disadvantage of keyset pagination is that you cannot skip to a specific row offset.

Customization callbacks

There are two callback functions:

PreActionCallback
PostActionCallback

Each of these is invoked before and after each function of the CRUD is called.

Web Service Framework Support

Library	Status	Adapter
net/http	YES	nethttp
go-fiber	NO	gofiber
gin	NO

Database support

Database	Create	Read	Update	Delete	TESTED
PostgreSQL	YES	YES	YES	YES	YES
MYSQL	YES	YES	YES	YES	NO
SQLITE	YES	YES	YES	YES	NO

Validation

crudiator does not provide data validation. Validation is not appropriate at this layer. It should be trivial to use data validators at a higher layer before passing data to crudiator.

crudiator's People

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crudiator's Issues

Add type converters

Add support for type conversion.

Currently, conversion can be done manually through postRead/preCreate/preUpdate callbacks.

Having pre-defined re-usable converters would be ideal.

Example:

type FieldConverter func(src any) (any, error)

type Field struct {
    ...
    Converter FieldConverter
}

var ConvertTo FieldOption = func(converter FieldConverter) FieldOption {
    return func(f *Field) {
        f.Converter = converter;
    }
}

var uuidStringType FieldConverter = func(src any) (any, error){
    return string(src), nil
}

crudiator.NewField("user_uuid", crudiator.ConvertTo(uuidStringType))

FEATURE: Add Context support

Add *Context methods (i.e CreateWithContext, ReadWithContext, UpdateWithContext, DeleteWithContext to call sql.DB.ExecContext())

FEATURE: Add table joins

Add support for table joins.

Start by prefixing column names with table name/alias

fooCrudiator = crudiator.MustNewEditor(
		"foo",
		crudiator.POSTGRESQL,
		crudiator.NewField("id", crudiator.IsPrimaryKey, crudiator.IncludeOnRead),
		crudiator.NewField("name", crudiator.IncludeAlways),
                crudiator.NewField("bar_id", crudiator.IncludeAlways),
                crudiator.NewField("some_x", crudiator.IncludeAlways),
                crudiator.NewField("some_y", crudiator.IncludeAlways)).
                Join("bar", "optionalTableAlias", crudiator.NewJoinField("optionalTableAlias.id", "foo.bar_id"), crudiator.NewJoinField("optionalTableAlias.some_x", "foo.some_x")). // JOIN bar AS optionalTableAlias ON foo.bar_id = optionalTableAlias.id AND optionalTableAlias.some_x = foo.some_x
                Join("bar", nil, crudiator.NewJoinField("bar.id", "foo.some_y")).
		Build()

Add custom SQL filters support

Improve field definitions by adding proper custom column filter SQL

Example

Called during create

crudiator.NewField("field",  crudiator.CreateFilter("$1 || UPPER($3)"))
// INSERT INTO foo (field,f2,f3) VALUES($1 || UPPER($3), $2, $3)

Called during read

crudiator.NewField("field",  crudiator.ReadFilter("IS NOT NULL AND upper(field) = upper($3)"))
// SELECT * FROM foo WHERE field IS NOT NULL AND upper(field) = upper($3)

Called during update

crudiator.NewField("field",  crudiator.UpdateFilter("upper($3)"))
// UPDATE foo SET field = upper($3)

Migrate tests to testcontainers

Migrate tests to testcontainers.com database