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https://github.com/samonzeweb/godb
A Go SQL query builder and struct mapper.
https://github.com/samonzeweb/godb
database go golang orm sql
Last synced: 21 days ago
JSON representation
A Go SQL query builder and struct mapper.
- Host: GitHub
- URL: https://github.com/samonzeweb/godb
- Owner: samonzeweb
- License: mit
- Created: 2016-12-11T14:37:06.000Z (over 7 years ago)
- Default Branch: master
- Last Pushed: 2023-12-18T22:50:04.000Z (6 months ago)
- Last Synced: 2024-02-14T22:32:37.823Z (4 months ago)
- Topics: database, go, golang, orm, sql
- Language: Go
- Homepage:
- Size: 359 KB
- Stars: 726
- Watchers: 18
- Forks: 29
- Open Issues: 3
-
Metadata Files:
- Readme: README.md
- License: LICENSE.txt
Lists
- awesome-discoveries - godb - a Go query builder and struct mapper _(`Go`)_ (Libraries)
- go-awesome - godb - a Go query builder and struct mapper (开源类库 / 数据库)
- awesome-golang-repositories - godb
- go-awesome - godb - a Go query builder and struct mapper (开源类库 / 数据库)
- go-awesome - godb - a Go query builder and struct mapper (Open source library / Database)
README
# godb - a Go query builder and struct mapper
 [](https://godoc.org/github.com/samonzeweb/godb)
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
- Queries builder.
- Mapping between structs and tables (or views).
- Mapping with nested structs.
- Execution of custom SELECT, INSERT, UPDATE and DELETE queries with structs and slices.
- Optional execution of SELECT queries with an iterator to limit memory consumption if needed (e.g. batches).
- Execution of raw queries, mapping rows to structs.
- Optimistic Locking
- SQL queries and durations logs.
- Two adjustable prepared statements caches (with/without transaction).
- `RETURNING` support for PostgreSQL.
- `OUTPUT` support for SQL Server.
- Optional common db errors handling for backend databases.(`db.UseErrorParser()`)
- Define your own logger (should have `Println(...)` method)
- Define model struct name to db table naming with `db.SetDefaultTableNamer(yourFn)`. Supported types are: Plural,Snake,SnakePlural. You can also define `TableName() string` method to for your struct and return whatever table name will be.
- BlackListing or WhiteListing columns for struct based inserts and updates.
- Could by used with
- SQLite
- PostgreSQL
- MySQL / MariaDB
- MS SQL Server
- other compatible database if you write an adapter.
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](https://github.com/samonzeweb/godb/tree/v1.0.14) .
## Documentation
There are three forms of documentation :
- This README with the example presented below, which gives an overview of what godb allows.
- The tests in `dbtests/common`, which are run on the different databases supported.
- Detailed documentation on GoDoc: https://godoc.org/github.com/samonzeweb/godb
## 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.
```go
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.