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godb - a Go query builder and struct mapper

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godb is a simple Go query builder and struct mapper, not a full-featured ORM. godb does not manage relationships.

Initially, godb was a learning project. The goal was to improve my Go skills by doing some useful things. But more and more features have been added and godb has become a serious project that can be used by others.

godb is a project that is still young and evolving. The API is almost stable, but it can still change slightly from one version to another. Each new version is associated with a tag, so it is possible to target a particular one if necessary.

Features

I made tests of godb on differents architectures and operating systems : OSX, Windows, Linux, ARM (Cortex A7) and Intel x64.

The current version of godb is compatible from Go 1.13 to 1.19. Older versions through 1.10 to 1.12 are supported by the v1.0.14 tag .

Documentation

There are three forms of documentation :

Install

go get github.com/samonzeweb/godb

Install the required driver (see tests). You cas use multiple databases if needed.

Of course you can also use a dependency management tool like dep.

Running Tests

godb tests use GoConvey and at least SQLite :

go get github.com/smartystreets/goconvey
go get github.com/mattn/go-sqlite3

To run tests, go into the godb directory and executes go test ./...

SQLite tests are done with in memory database, it's fast. You can run tests with others databases, see below.

With the exception of SQLite, all drivers are pure Go code, and does not require external dependencies.

Test with PostgreSQL

Install the driver and set the GODB_POSTGRESQL environment variable with the PostgreSQL connection string.

go get github.com/lib/pq
GODB_POSTGRESQL="your connection string" go test ./...

Test with MySQL / MariaDB

Install the driver and set the GODB_MYSQL environment variable with the MySQL connection string.

go get github.com/go-sql-driver/mysql
GODB_MYSQL="your connection string" go test ./...

Test with MS SQL Server

Install the driver and set the GODB_MSSQL environment variable with the SQL Server connection string.

go get github.com/denisenkom/go-mssqldb
GODB_MSSQL="your connection string" go test ./...

Test all with Docker

Using Docker you can test with SQLite, PostgreSQL, MariaDB and SQL Server with the testallwithdocker.sh shell script.

SQL Server is greedy, on OSX allow at least 4Go to Docker.

Example

The example below illustrates the main features of godb.

You can copy the code into an example.go file and run it. You need to create the database and the books table as explained in the code.

package main

import (
	"database/sql"
	"fmt"
	"time"

	"github.com/samonzeweb/godb"
	"github.com/samonzeweb/godb/adapters/sqlite"
	"log"
	"os"
)

/*
  To run this example, initialize a SQLite3 DB called 'library.db' and add
  a 'books' table like this :

  create table books (
  	id        integer not null primary key autoincrement,
  	title     text    not null,
  	author    text    not null,
  	published date    not null);
*/

// Struct and its mapping
type Book struct {
	Id        int       `db:"id,key,auto"`
	Title     string    `db:"title"`
	Author    string    `db:"author"`
	Published time.Time `db:"published"`
}

// Optional, default if the struct name (Book)
func (*Book) TableName() string {
	return "books"
}

// See "group by" example
type CountByAuthor struct {
	Author string `db:"author"`
	Count  int    `db:"count"`
}

func main() {
	// Examples fixtures
	var authorTolkien = "J.R.R. tolkien"

	var bookTheHobbit = Book{
		Title:     "The Hobbit",
		Author:    authorTolkien,
		Published: time.Date(1937, 9, 21, 0, 0, 0, 0, time.UTC),
	}

	var bookTheFellowshipOfTheRing = Book{
		Title:     "The Fellowship of the Ring",
		Author:    authorTolkien,
		Published: time.Date(1954, 7, 29, 0, 0, 0, 0, time.UTC),
	}

	var bookTheTwoTowers = Book{
		Title:     "The Two Towers",
		Author:    authorTolkien,
		Published: time.Date(1954, 11, 11, 0, 0, 0, 0, time.UTC),
	}

	var bookTheReturnOfTheKing = Book{
		Title:     "The Return of the King",
		Author:    authorTolkien,
		Published: time.Date(1955, 10, 20, 0, 0, 0, 0, time.UTC),
	}

	var setTheLordOfTheRing = []Book{
		bookTheFellowshipOfTheRing,
		bookTheTwoTowers,
		bookTheReturnOfTheKing,
	}

	// Connect to the DB
	db, err := godb.Open(sqlite.Adapter, "./library.db")
	panicIfErr(err)
	// OPTIONAL: Set logger to show SQL execution logs
	db.SetLogger(log.New(os.Stderr, "", 0))
	// OPTIONAL: Set default table name building style from struct's name(if active struct doesn't have TableName() method)
	db.SetDefaultTableNamer(tablenamer.Plural())
	// Single insert (id will be updated)
	err = db.Insert(&bookTheHobbit).Do()
	panicIfErr(err)

	// Multiple insert
	// Warning : BulkInsert only update ids with PostgreSQL and SQL Server!
	err = db.BulkInsert(&setTheLordOfTheRing).Do()
	panicIfErr(err)

	// Count
	count, err := db.SelectFrom("books").Count()
	panicIfErr(err)
	fmt.Println("Books count : ", count)

	// Custom select
	countByAuthor := make([]CountByAuthor, 0, 0)
	err = db.SelectFrom("books").
		Columns("author", "count(*) as count").
		GroupBy("author").
		Having("count(*) > 3").
		Do(&countByAuthor)
	fmt.Println("Count by authors : ", countByAuthor)

	// Select single object
	singleBook := Book{}
	err = db.Select(&singleBook).
		Where("title = ?", bookTheHobbit.Title).
		Do()
	if err == sql.ErrNoRows {
		// sql.ErrNoRows is only returned when the target is a single instance
		fmt.Println("Book not found !")
	} else {
		panicIfErr(err)
	}

	// Select single record values
	authorName := ""
	title := ""
	err = db.SelectFrom("books").
		Where("title = ?", bookTheHobbit.Title).
		Columns("author", "title").
		Scanx(&authorName, &title)
	if err == sql.ErrNoRows {
		// sql.ErrNoRows is only returned when the target is a single instance
		fmt.Println("Book not found !")
	} else {
		panicIfErr(err)
	}

	// Select multiple objects
	multipleBooks := make([]Book, 0, 0)
	err = db.Select(&multipleBooks).Do()
	panicIfErr(err)
	fmt.Println("Books found : ", len(multipleBooks))

	// Iterator
	iter, err := db.SelectFrom("books").
		Columns("id", "title", "author", "published").
		DoWithIterator()
	panicIfErr(err)
	for iter.Next() {
		book := Book{}
		err := iter.Scan(&book)
		panicIfErr(err)
		fmt.Println(book)
	}
	panicIfErr(iter.Err())
	panicIfErr(iter.Close())

	// Raw query
	subQuery := godb.NewSQLBuffer(0, 0). // sizes are indicative
						Write("select author ").
						Write("from books ").
						WriteCondition(godb.Q("where title = ?", bookTheHobbit.Title))

	queryBuffer := godb.NewSQLBuffer(64, 0).
		Write("select * ").
		Write("from books ").
		Write("where author in (").
		Append(subQuery).
		Write(")")

	panicIfErr(queryBuffer.Err())

	books := make([]Book, 0, 0)
	err = db.RawSQL(queryBuffer.SQL(), queryBuffer.Arguments()...).Do(&books)
	panicIfErr(err)
	fmt.Printf("Raw query found %d books\n", len(books))

	// Update and transactions
	err = db.Begin()
	panicIfErr(err)

	updated, err := db.UpdateTable("books").Set("author", "Tolkien").Do()
	panicIfErr(err)
	fmt.Println("Books updated : ", updated)

	bookTheHobbit.Author = "Tolkien"
	err = db.Update(&bookTheHobbit).Do()
	panicIfErr(err)
	fmt.Println("Books updated : ", updated)

	err = db.Rollback()
	panicIfErr(err)

	// Delete
	deleted, err := db.Delete(&bookTheHobbit).Do()
	panicIfErr(err)
	fmt.Println("Books deleted : ", deleted)

	deleted, err = db.DeleteFrom("books").
		WhereQ(godb.Or(
			godb.Q("author = ?", authorTolkien),
			godb.Q("author = ?", "Georged Orwell"),
		)).
		Do()
	panicIfErr(err)
	fmt.Println("Books deleted : ", deleted)

	// Bye
	err = db.Close()
	panicIfErr(err)
}

// It's just an example, what did you expect ? (never do that in real code)
func panicIfErr(err error) {
	if err != nil {
		panic(err)
	}
}

Licence

Released under the MIT License, see LICENSE.txt for more informations.