This fork contains improvements to support generation of column name field helpers.
This fork also contains support for fetching embedded structs without conflict. If the embedded struct has a db tag, then the requested column with be "{embedded stuct tag}___{embedded struct's field's name}". The ColsWithPrefix helps to generate the columns to request.
Embedded structs can be made optional with pointers and a LEFT JOIN.
type EmployeeWithUser struct {
models.Employee `db:"employees"`
*models.User `db:"users"
}
func myFunc(employeesTable *dbr.Table, usersTable *dbr.Table) {
cols := []string{}
cols = append(cols, employeesTable.ColsWithPrefix("employees")...)
cols = append(cols, usersTable.ColsWithPrefix("users")...)
e := &EmployeeWithUser{}
tx.Select(cols...) # rest of the query with the appropriate join goes here
.LoadOne(e)
}
gocraft/dbr provides additions to Go's database/sql for super fast performance and convenience.
$ go get -u github.com/gocraft/dbr/v2
import "github.com/gocraft/dbr/v2"- MySQL
- PostgreSQL
- SQLite3
- MsSQL
See godoc for more examples.
// create a connection (e.g. "postgres", "mysql", or "sqlite3")
conn, _ := Open("postgres", "...", nil)
conn.SetMaxOpenConns(10)
// create a session for each business unit of execution (e.g. a web request or goworkers job)
sess := conn.NewSession(nil)
// create a tx from sessions
sess.Begin()sess := mysqlSession
tx, err := sess.Begin()
if err != nil {
return
}
defer tx.RollbackUnlessCommitted()
// do stuff...
tx.Commit()// columns are mapped by tag then by field
type Suggestion struct {
ID int64 // id, will be autoloaded by last insert id
Title NullString `db:"subject"` // subjects are called titles now
Url string `db:"-"` // ignored
secret string // ignored
}
// By default gocraft/dbr converts CamelCase property names to snake_case column_names.
// You can override this with struct tags, just like with JSON tags.
// This is especially helpful while migrating from legacy systems.
var suggestions []Suggestion
sess := mysqlSession
sess.Select("*").From("suggestions").Load(&suggestions)// database/sql uses prepared statements, which means each argument
// in an IN clause needs its own question mark.
// gocraft/dbr, on the other hand, handles interpolation itself
// so that you can easily use a single question mark paired with a
// dynamically sized slice.
sess := mysqlSession
ids := []int64{1, 2, 3, 4, 5}
sess.Select("*").From("suggestions").Where("id IN ?", ids)sess := mysqlSession
sess.Select("*").From("suggestions").
Join("subdomains", "suggestions.subdomain_id = subdomains.id")
sess.Select("*").From("suggestions").
LeftJoin("subdomains", "suggestions.subdomain_id = subdomains.id")
// join multiple tables
sess.Select("*").From("suggestions").
Join("subdomains", "suggestions.subdomain_id = subdomains.id").
Join("accounts", "subdomains.accounts_id = accounts.id")SelectBySql("SELECT `title`, `body` FROM `suggestions` ORDER BY `id` ASC LIMIT 10")type Suggestion struct {
ID int64
Title NullString
CreatedAt time.Time
}
sugg := &Suggestion{
Title: NewNullString("Gopher"),
CreatedAt: time.Now(),
}
sess := mysqlSession
sess.InsertInto("suggestions").
Columns("title").
Record(sugg).
Exec()
// id is set automatically
fmt.Println(sugg.ID)sess := mysqlSession
sess.InsertInto("suggestions").
Pair("title", "Gopher").
Pair("body", "I love go.")BenchmarkLoadValues/sqlx_10-8 5000 407318 ns/op 3913 B/op 164 allocs/op
BenchmarkLoadValues/dbr_10-8 5000 372940 ns/op 3874 B/op 123 allocs/op
BenchmarkLoadValues/sqlx_100-8 2000 584197 ns/op 30195 B/op 1428 allocs/op
BenchmarkLoadValues/dbr_100-8 3000 558852 ns/op 22965 B/op 937 allocs/op
BenchmarkLoadValues/sqlx_1000-8 1000 2319101 ns/op 289339 B/op 14031 allocs/op
BenchmarkLoadValues/dbr_1000-8 1000 2310441 ns/op 210092 B/op 9040 allocs/op
BenchmarkLoadValues/sqlx_10000-8 100 17004716 ns/op 3193997 B/op 140043 allocs/op
BenchmarkLoadValues/dbr_10000-8 100 16150062 ns/op 2394698 B/op 90051 allocs/op
BenchmarkLoadValues/sqlx_100000-8 10 170068209 ns/op 31679944 B/op 1400053 allocs/op
BenchmarkLoadValues/dbr_100000-8 10 147202536 ns/op 23680625 B/op 900061 allocs/op
Inspiration from these excellent libraries:
- sqlx - various useful tools and utils for interacting with database/sql.
- Squirrel - simple fluent query builder.
Authors:
- Jonathan Novak -- https://github.com/cypriss
- Tai-Lin Chu -- https://github.com/taylorchu
- Sponsored by UserVoice
Contributors:
- Paul Bergeron -- https://github.com/dinedal - SQLite dialect
