Created
August 19, 2019 09:49
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черновик, вдохновлённый https://developer.android.com/training/data-storage/room/index.html#java
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package dao | |
import "database/sql" | |
// Стоит ли использовать gorm нотацию? | |
type Entity struct {} | |
type User struct { | |
Entity | |
Uid int32 `--:"uid serial4 primary key"` | |
FirstName *string `--:"first_name text null"` | |
LastName *string `--:"last_name text null"` | |
} | |
type Dao struct { | |
sql.DB | |
} | |
// Make goland treat structure tags as sql | |
// language=PostgreSQL | |
type UserDao struct{ | |
Dao | |
GetAll func() []User `--query:" | |
select * from user; --"` | |
LoadAllByIds func(userIds []int32) []User `--query:" | |
select * from user where uid in (:userIds); --"` | |
FindByName func(first string, last string) User `--query:" | |
select * from user where first_name like :first and last_name like :last limit 1; --"` | |
InsertAll func(users ...User) `--insert:""` | |
Delete func(user User) `--delete:""` | |
} | |
// При помощи кодогенерации создаётся функция | |
var NewUserDao func(db *sql.DB) *UserDao | |
// которая возвращает Dao. | |
// Несколько Dao должны использовать только один пул соединений sql.DB. | |
// есть черновик синтаксиса. | |
// нужно ручками написать для нескольких dao требуемый код |
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