gola

gola

gola is an ORM lib for go utilizing generic with unique approach:

Fully strong typed

No need to specify column name via string for all CRUD ops:

b := book.NewBook()
b.SetTitle("The Go Programming Language")
b.SetPrice(10)
b.Insert() // Auto-increment Primary Key id will be assigned

b.SetPrice(20) // Internally mark price field pending for update
b.Update() // Only price field will be updated

book.DeleteByPK(b.GetId())

IAQ - Index Aware Query

Flexible select methods based on db index, i.e. IAQ - Index Aware Query.

Assuming the following table:

CREATE TABLE `blogs` (
  `id` int NOT NULL AUTO_INCREMENT,
  `user_id` int(11) NOT NULL DEFAULT '0' COMMENT 'User Id',
  `slug` varchar(255) NOT NULL DEFAULT '' COMMENT 'Slug',
  `title` varchar(255) NOT NULL DEFAULT '' COMMENT 'Title',
  `category_id` int(11) NOT NULL DEFAULT '0' COMMENT 'Category Id',
  `country` varchar(255) NOT NULL DEFAULT '' COMMENT 'Country of the blog user',
  PRIMARY KEY (`id`),
  KEY `user` (`user_id`),
  KEY `country_cate` (`country`, `category_id`),
  UNIQUE KEY `slug` (`slug`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4;

gola will generate methods like:

// Select all columns
// data is []*blogs.Blog type
data := blogs.Select().WhereCountryEQ("SG").AndCategoryIdEQ(1).All()

/* Select only id, title columns with order & offset / limit
   data is []*struct {
    blogs.Id
    blogs.Title
  }

  i.e. can only access Id / Title field, fields not selected like country won't be accessible
*/
data := blogs.SelectFields[struct {
    blogs.Id
    blogs.Title
  }]().WhereCountryEQ("SG").AndCategoryIdEQ(1).OrderBy(blogs.IdDesc).Limit(0, 10)

The methods like WhereCountryEQ and AndCategoryIdEQ are strictly generated based on index available in db.

If columns are not available in any index, query methods won't be accessible.

In this way, gola will then ensure that all queries are backed by index.

PS: Query using arbitrary SQL is also supported, but purposely made not as convenient as IAQ.

Extreme fast

gola is the fastest in all benchmarks specified by boilbench, comparing to gorm / xorm / pop / gorp / Kallax and sqlboiler.

Misc feature

• JSON Marshal
• Read / Write db separation

Usage

• Make sure have go 1.18 or above installed
• Install the lastest version of gola binary:

go install github.com/olachat/gola

Check gola version: gola --version

The lastest version should be 0.1.0

Model Generation

After installation, run gola gen in a folder containing gola.toml config file.

gola.toml's content should be similar to:

[mysql]
host    = "localhost"
port    = 3306
user    = "root"
pass    = ""
sslmode = "false"
dbname = "testdb"
blacklist = []
whitelist = ["blogs"]
output = "models"

gola gen will then generate orm codes for blogs table into models folder.

if whitelist is not specified, all tables in dbname database will be generated if not blacklisted.

Setup

Upon your application start, db instance factory must be passed to gola's coredb:

import (
  "database/sql"
  "github.com/olachat/gola/coredb"
)

func main() {
  // dbread := get *sql.DB struct for read
  // dbwrite := get *sql.DB struct for write

  coredb.Setup(func(dbname string, m coredb.DBMode) *sql.DB {
    if m == coredb.DBModeRead {
      return dbread
    }
    return dbwrite
  })
}

If you don't need read / write db separation, could just return the same instance:

  // db := get the normal *sql.DB struct

  coredb.Setup(func(_ string, _ coredb.DBMode) *sql.DB {
    return db
  })

CRUD

Common crud operations are all supported.

Struct Methods

gola struct will support:

• GetXXX / SetXXX methods for all columns fields
• Insert()
  • AutoIncrement key value will be automatically assign to struct after insertion
• Update()
  • Automatically update fields's Set method has been called

Package Methods

Each table will be generated into its own package / folder.

For example, there are two tables bloggers and blogs in blogdb database, and code generated into models folder.

gola will create two folders:

• models/bloggers
• models/blogs

Each folder / package will have following global methods for its table:

• FetchByPK: get a row with all column fields from table with given primary key
• FetchFieldsByPK: get a row with given columns fields from table with given primary key
• Select(): IAQ select methods returns all columns fields
• SelectFields[T](): IAQ select methods returns given columns fields
• DeleteByPK(): Delete a row with given primary key

coredb Methods

• coredb.Setup
• coredb.Exec
• coredb.Query[T]
• coredb.QueryInt

Contribute

Clone the source source:

git clone git@github.com:olachat/gola.git

Test

go test ./... will run a full test for gola.

go test ./golalib command will:

• Use golalib/testdata sql files to create tables on the fly
• Do code generation for tables
• Compare with golalib/testdata/*.go
• Report error if file not matching

Use go test ./golalib -update, if template is changed, and want to update golalib/testdata/*.go

Todo

• CURD
  • Auto updatedt field value
• index query methods
  • Count with IAQ
  • uniuqe index
  • paging using cursor
• data types
  • more nullable types
  • decimal
• Hooks
  • Insert
  • Update
  • Delete
• context support
• transaction support
• Cache support
• tutorial