mirror of
https://github.com/zeromicro/go-zero.git
synced 2025-01-24 18:00:24 +08:00
d21d770b5b
* reactor sql generation
* reactor sql generation
* add console & example
* optimize unit test & add document
* modify default config
* remove test file
* Revert "remove test file"
This reverts commit 81041f9e
* fix stringx.go & optimize example
* remove unused code
254 lines
8.9 KiB
Markdown
254 lines
8.9 KiB
Markdown
# Goctl Model
|
||
|
||
goctl model 为go-zero下的工具模块中的组件之一,目前支持识别mysql ddl进行model层代码生成,通过命令行或者idea插件(即将支持)可以有选择地生成带redis cache或者不带redis cache的代码逻辑。
|
||
|
||
# 快速开始
|
||
|
||
```
|
||
$ goctl model -src ./sql/user.sql -dir ./model -c true
|
||
```
|
||
|
||
详情用法请参考[example](https://github.com/tal-tech/go-zero/tools/goctl/model/sql/example)
|
||
|
||
执行上述命令后即可快速生成CURD代码。
|
||
|
||
```
|
||
model
|
||
│ ├── error.go
|
||
│ └── usermodel.go
|
||
```
|
||
|
||
> 注意:这里的目录结构中有usercoursemodel.go目录,在example中我为了体现带cache与不带cache代码的区别,因此将sql文件分别使用了独立的sql文件(user.sql&course.sql),在实际项目开发中你可以将ddl建表语句放在一个sql文件中,`goctl model`会自动解析并分割,最终按照每个ddl建表语句为单位生成独立的go文件。
|
||
|
||
* 生成代码示例
|
||
|
||
``` go
|
||
package model
|
||
|
||
import (
|
||
"database/sql"
|
||
"fmt"
|
||
"strings"
|
||
"time"
|
||
|
||
"github.com/tal-tech/go-zero/core/stores/cache"
|
||
"github.com/tal-tech/go-zero/core/stores/sqlc"
|
||
"github.com/tal-tech/go-zero/core/stores/sqlx"
|
||
"github.com/tal-tech/go-zero/core/stringx"
|
||
"github.com/tal-tech/go-zero/tools/goctl/model/sql/builderx"
|
||
)
|
||
|
||
var (
|
||
userFieldNames = builderx.FieldNames(&User{})
|
||
userRows = strings.Join(userFieldNames, ",")
|
||
userRowsExpectAutoSet = strings.Join(stringx.Remove(userFieldNames, "id", "create_time", "update_time"), ",")
|
||
userRowsWithPlaceHolder = strings.Join(stringx.Remove(userFieldNames, "id", "create_time", "update_time"), "=?,") + "=?"
|
||
|
||
cacheUserMobilePrefix = "cache#User#mobile#"
|
||
cacheUserIdPrefix = "cache#User#id#"
|
||
cacheUserNamePrefix = "cache#User#name#"
|
||
)
|
||
|
||
type (
|
||
UserModel struct {
|
||
sqlc.CachedConn
|
||
table string
|
||
}
|
||
|
||
User struct {
|
||
Id int64 `db:"id"`
|
||
Name string `db:"name"` // 用户名称
|
||
Password string `db:"password"` // 用户密码
|
||
Mobile string `db:"mobile"` // 手机号
|
||
Gender string `db:"gender"` // 男|女|未公开
|
||
Nickname string `db:"nickname"` // 用户昵称
|
||
CreateTime time.Time `db:"create_time"`
|
||
UpdateTime time.Time `db:"update_time"`
|
||
}
|
||
)
|
||
|
||
func NewUserModel(conn sqlx.SqlConn, c cache.CacheConf, table string) *UserModel {
|
||
return &UserModel{
|
||
CachedConn: sqlc.NewConn(conn, c),
|
||
table: table,
|
||
}
|
||
}
|
||
|
||
func (m *UserModel) Insert(data User) (sql.Result, error) {
|
||
query := `insert into ` + m.table + `(` + userRowsExpectAutoSet + `) value (?, ?, ?, ?, ?)`
|
||
return m.ExecNoCache(query, data.Name, data.Password, data.Mobile, data.Gender, data.Nickname)
|
||
}
|
||
|
||
func (m *UserModel) FindOne(id int64) (*User, error) {
|
||
userIdKey := fmt.Sprintf("%s%v", cacheUserIdPrefix, id)
|
||
var resp User
|
||
err := m.QueryRow(&resp, userIdKey, func(conn sqlx.SqlConn, v interface{}) error {
|
||
query := `select ` + userRows + ` from ` + m.table + ` where id = ? limit 1`
|
||
return conn.QueryRow(v, query, id)
|
||
})
|
||
switch err {
|
||
case nil:
|
||
return &resp, nil
|
||
case sqlc.ErrNotFound:
|
||
return nil, ErrNotFound
|
||
default:
|
||
return nil, err
|
||
}
|
||
}
|
||
|
||
func (m *UserModel) FindOneByName(name string) (*User, error) {
|
||
userNameKey := fmt.Sprintf("%s%v", cacheUserNamePrefix, name)
|
||
var resp User
|
||
err := m.QueryRowIndex(&resp, userNameKey, func(primary interface{}) string {
|
||
return fmt.Sprintf("%s%v", cacheUserIdPrefix, primary)
|
||
}, func(conn sqlx.SqlConn, v interface{}) (i interface{}, e error) {
|
||
query := `select ` + userRows + ` from ` + m.table + ` where name = ? limit 1`
|
||
if err := conn.QueryRow(&resp, query, name); err != nil {
|
||
return nil, err
|
||
}
|
||
return resp.Id, nil
|
||
}, func(conn sqlx.SqlConn, v, primary interface{}) error {
|
||
query := `select ` + userRows + ` from ` + m.table + ` where id = ? limit 1`
|
||
return conn.QueryRow(v, query, primary)
|
||
})
|
||
switch err {
|
||
case nil:
|
||
return &resp, nil
|
||
case sqlc.ErrNotFound:
|
||
return nil, ErrNotFound
|
||
default:
|
||
return nil, err
|
||
}
|
||
}
|
||
|
||
func (m *UserModel) FindOneByMobile(mobile string) (*User, error) {
|
||
userMobileKey := fmt.Sprintf("%s%v", cacheUserMobilePrefix, mobile)
|
||
var resp User
|
||
err := m.QueryRowIndex(&resp, userMobileKey, func(primary interface{}) string {
|
||
return fmt.Sprintf("%s%v", cacheUserIdPrefix, primary)
|
||
}, func(conn sqlx.SqlConn, v interface{}) (i interface{}, e error) {
|
||
query := `select ` + userRows + ` from ` + m.table + ` where mobile = ? limit 1`
|
||
if err := conn.QueryRow(&resp, query, mobile); err != nil {
|
||
return nil, err
|
||
}
|
||
return resp.Id, nil
|
||
}, func(conn sqlx.SqlConn, v, primary interface{}) error {
|
||
query := `select ` + userRows + ` from ` + m.table + ` where id = ? limit 1`
|
||
return conn.QueryRow(v, query, primary)
|
||
})
|
||
switch err {
|
||
case nil:
|
||
return &resp, nil
|
||
case sqlc.ErrNotFound:
|
||
return nil, ErrNotFound
|
||
default:
|
||
return nil, err
|
||
}
|
||
}
|
||
|
||
func (m *UserModel) Update(data User) error {
|
||
userIdKey := fmt.Sprintf("%s%v", cacheUserIdPrefix, data.Id)
|
||
_, err := m.Exec(func(conn sqlx.SqlConn) (result sql.Result, err error) {
|
||
query := `update ` + m.table + ` set ` + userRowsWithPlaceHolder + ` where id = ?`
|
||
return conn.Exec(query, data.Name, data.Password, data.Mobile, data.Gender, data.Nickname, data.Id)
|
||
}, userIdKey)
|
||
return err
|
||
}
|
||
|
||
func (m *UserModel) Delete(id int64) error {
|
||
data, err := m.FindOne(id)
|
||
if err != nil {
|
||
return err
|
||
}
|
||
userIdKey := fmt.Sprintf("%s%v", cacheUserIdPrefix, id)
|
||
userNameKey := fmt.Sprintf("%s%v", cacheUserNamePrefix, data.Name)
|
||
userMobileKey := fmt.Sprintf("%s%v", cacheUserMobilePrefix, data.Mobile)
|
||
_, err = m.Exec(func(conn sqlx.SqlConn) (result sql.Result, err error) {
|
||
query := `delete from ` + m.table + ` where id = ?`
|
||
return conn.Exec(query, id)
|
||
}, userIdKey, userNameKey, userMobileKey)
|
||
return err
|
||
}
|
||
```
|
||
|
||
# 用法
|
||
|
||
```
|
||
$ goctl model -h
|
||
```
|
||
|
||
```
|
||
NAME:
|
||
goctl model - generate model code
|
||
|
||
USAGE:
|
||
goctl model [command options] [arguments...]
|
||
|
||
OPTIONS:
|
||
--src value, -s value the file path of the ddl source file
|
||
--dir value, -d value the target dir
|
||
--cache, -c generate code with cache [optional]
|
||
--idea for idea plugin [optional]
|
||
|
||
```
|
||
|
||
# 生成规则
|
||
|
||
* 默认规则
|
||
|
||
我们默认用户在建表时会创建createTime、updateTime字段(忽略大小写、下划线命名风格)且默认值均为`CURRENT_TIMESTAMP`,而updateTime支持`ON UPDATE CURRENT_TIMESTAMP`,对于这两个字段生成`insert`、`update`时会被移除,不在赋值范畴内,当然,如果你不需要这两个字段那也无大碍。
|
||
* 带缓存模式
|
||
|
||
```
|
||
$ goctl model -src {filename} -dir {dir} -cache true
|
||
```
|
||
|
||
目前仅支持redis缓存,如果选择带缓存模式,即生成的`FindOne(ByXxx)`&`Delete`代码会生成带缓存逻辑的代码,目前仅支持单索引字段(除全文索引外),对于联合索引我们默认认为不需要带缓存,且不属于通用型代码,因此没有放在代码生成行列,如example中user表中的`id`、`name`、`mobile`字段均属于单字段索引。
|
||
|
||
* 不带缓存模式
|
||
|
||
```
|
||
$ goctl model -src {filename} -dir {dir}
|
||
```
|
||
or
|
||
```
|
||
$ goctl model -src {filename} -dir {dir} -cache false
|
||
```
|
||
生成代码仅基本的CURD结构。
|
||
|
||
# 缓存
|
||
|
||
对于缓存这一块我选择用一问一答的形式进行罗列。我想这样能够更清晰的描述model中缓存的功能。
|
||
|
||
* 缓存会缓存哪些信息?
|
||
|
||
对于主键字段缓存,会缓存整个结构体信息,而对于单索引字段(除全文索引)则缓存主键字段值。
|
||
|
||
* 数据有更新(`update`)操作会清空缓存吗?
|
||
|
||
会,但仅清空主键缓存的信息,why?这里就不做详细赘述了。
|
||
|
||
* 为什么不按照单索引字段生成`updateByXxx`和`deleteByXxx`的代码?
|
||
|
||
理论上是没任何问题,但是我们认为,对于model层的数据操作均是以整个结构体为单位,包括查询,我不建议只查询某部分字段(不反对),否则我们的缓存就没有意义了。
|
||
|
||
* 为什么不支持`findPageLimit`、`findAll`这么模式代码生层?
|
||
|
||
目前,我认为除了基本的CURD外,其他的代码均属于<i>业务型</i>代码,这个我觉得开发人员根据业务需要进行编写更好。
|
||
|
||
# QA
|
||
|
||
* goctl model支持根据数据库连接后选择表生成代码吗?
|
||
|
||
目前暂时不支持,在后面会向这个方向扩展。
|
||
|
||
* goctl model除了命令行模式,支持插件模式吗?
|
||
|
||
很快支持idea插件。
|
||
|
||
|
||
|
||
|
||
|
||
|