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
通过ddl生成
$ goctl model mysql ddl -src="./*.sql" -dir="./sql/model" -c
执行上述命令后即可快速生成CURD代码。
model
│ ├── error.go
│ └── usermodel.go
通过datasource生成
$ goctl model mysql datasource -url="user:password@tcp(127.0.0.1:3306)/database" -table="*" -dir="./model"
生成代码示例
D:\Projects\Github\NoobWu\go-zero-demo\book\service\user\model\usermodel.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.RawFieldNames(&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`"), "=?,") + "=?"
cacheUserNamePrefix = "cache#User#name#"
cacheUserMobilePrefix = "cache#User#mobile#"
cacheUserIdPrefix = "cache#User#id#"
cacheUserPrefix = "cache#User#user#"
)
type (
UserModel interface {
Insert(data User) (sql.Result, error)
FindOne(id int64) (*User, error)
FindOneByUser(user string) (*User, error)
FindOneByName(name string) (*User, error)
FindOneByMobile(mobile string) (*User, error)
Update(data User) error
Delete(id int64) error
}
defaultUserModel struct {
sqlc.CachedConn
table string
}
User struct {
Id int64 `db:"id"`
User string `db:"user"` // 用户
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) UserModel {
return &defaultUserModel{
CachedConn: sqlc.NewConn(conn, c),
table: "`user`",
}
}
func (m *defaultUserModel) Insert(data User) (sql.Result, error) {
userNameKey := fmt.Sprintf("%s%v", cacheUserNamePrefix, data.Name)
userMobileKey := fmt.Sprintf("%s%v", cacheUserMobilePrefix, data.Mobile)
userKey := fmt.Sprintf("%s%v", cacheUserPrefix, data.User)
ret, err := m.Exec(func(conn sqlx.SqlConn) (result sql.Result, err error) {
query := fmt.Sprintf("insert into %s (%s) values (?, ?, ?, ?, ?, ?)", m.table, userRowsExpectAutoSet)
return conn.Exec(query, data.User, data.Name, data.Password, data.Mobile, data.Gender, data.Nickname)
}, userNameKey, userMobileKey, userKey)
return ret, err
}
func (m *defaultUserModel) 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 := fmt.Sprintf("select %s from %s where `id` = ? limit 1", userRows, m.table)
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 *defaultUserModel) FindOneByUser(user string) (*User, error) {
userKey := fmt.Sprintf("%s%v", cacheUserPrefix, user)
var resp User
err := m.QueryRowIndex(&resp, userKey, m.formatPrimary, func(conn sqlx.SqlConn, v interface{}) (i interface{}, e error) {
query := fmt.Sprintf("select %s from %s where `user` = ? limit 1", userRows, m.table)
if err := conn.QueryRow(&resp, query, user); err != nil {
return nil, err
}
return resp.Id, nil
}, m.queryPrimary)
switch err {
case nil:
return &resp, nil
case sqlc.ErrNotFound:
return nil, ErrNotFound
default:
return nil, err
}
}
func (m *defaultUserModel) FindOneByName(name string) (*User, error) {
userNameKey := fmt.Sprintf("%s%v", cacheUserNamePrefix, name)
var resp User
err := m.QueryRowIndex(&resp, userNameKey, m.formatPrimary, func(conn sqlx.SqlConn, v interface{}) (i interface{}, e error) {
query := fmt.Sprintf("select %s from %s where `name` = ? limit 1", userRows, m.table)
if err := conn.QueryRow(&resp, query, name); err != nil {
return nil, err
}
return resp.Id, nil
}, m.queryPrimary)
switch err {
case nil:
return &resp, nil
case sqlc.ErrNotFound:
return nil, ErrNotFound
default:
return nil, err
}
}
func (m *defaultUserModel) FindOneByMobile(mobile string) (*User, error) {
userMobileKey := fmt.Sprintf("%s%v", cacheUserMobilePrefix, mobile)
var resp User
err := m.QueryRowIndex(&resp, userMobileKey, m.formatPrimary, func(conn sqlx.SqlConn, v interface{}) (i interface{}, e error) {
query := fmt.Sprintf("select %s from %s where `mobile` = ? limit 1", userRows, m.table)
if err := conn.QueryRow(&resp, query, mobile); err != nil {
return nil, err
}
return resp.Id, nil
}, m.queryPrimary)
switch err {
case nil:
return &resp, nil
case sqlc.ErrNotFound:
return nil, ErrNotFound
default:
return nil, err
}
}
func (m *defaultUserModel) 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 := fmt.Sprintf("update %s set %s where `id` = ?", m.table, userRowsWithPlaceHolder)
return conn.Exec(query, data.User, data.Name, data.Password, data.Mobile, data.Gender, data.Nickname, data.Id)
}, userIdKey)
return err
}
func (m *defaultUserModel) Delete(id int64) error {
data, err := m.FindOne(id)
if err != nil {
return err
}
userNameKey := fmt.Sprintf("%s%v", cacheUserNamePrefix, data.Name)
userMobileKey := fmt.Sprintf("%s%v", cacheUserMobilePrefix, data.Mobile)
userIdKey := fmt.Sprintf("%s%v", cacheUserIdPrefix, id)
userKey := fmt.Sprintf("%s%v", cacheUserPrefix, data.User)
_, err = m.Exec(func(conn sqlx.SqlConn) (result sql.Result, err error) {
query := fmt.Sprintf("delete from %s where `id` = ?", m.table)
return conn.Exec(query, id)
}, userNameKey, userMobileKey, userIdKey, userKey)
return err
}
func (m *defaultUserModel) formatPrimary(primary interface{}) string {
return fmt.Sprintf("%s%v", cacheUserIdPrefix, primary)
}
func (m *defaultUserModel) queryPrimary(conn sqlx.SqlConn, v, primary interface{}) error {
query := fmt.Sprintf("select %s from %s where `id` = ? limit 1", userRows, m.table)
return conn.QueryRow(v, query, primary)
}
用法
$ goctl model mysql -h
PS D:\Projects\Github\NoobWu\go-zero-demo\book\service\user\model> goctl model mysql -h
NAME:
goctl.exe model mysql - generate mysql model
USAGE:
goctl.exe model mysql command [command options] [arguments...]
COMMANDS:
ddl generate mysql model from ddl
datasource generate model from datasource
OPTIONS:
--help, -h show help
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
- ddl
help ```bash NAME: goctl model mysql ddl - generate mysql model from ddl$ goctl model mysql -src={patterns} -dir={dir} -cache
- ddl
USAGE: goctl model mysql ddl [command options] [arguments…]
OPTIONS: —src value, -s value the path or path globbing patterns of the ddl —dir value, -d value the target dir —style value the file naming format, see [https://github.com/tal-tech/go-zero/tree/master/tools/goctl/config/readme.md] —cache, -c generate code with cache [optional] —idea for idea plugin [optional]
- datasource
```bash
$ goctl model mysql datasource -url={datasource} -table={patterns} -dir={dir} -cache=true
help
NAME:
goctl model mysql datasource - generate model from datasource
USAGE:
goctl model mysql datasource [command options] [arguments...]
OPTIONS:
--url value the data source of database,like "root:password@tcp(127.0.0.1:3306)/database
--table value, -t value the table or table globbing patterns in the database
--cache, -c generate code with cache [optional]
--dir value, -d value the target dir
--style value the file naming format, see [https://github.com/tal-tech/go-zero/tree/master/tools/goctl/config/readme.md]
--idea for idea plugin [optional]
Tip goctl model mysql ddl/datasource 均新增了一个—style参数,用于标记文件命名风格。
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
ddl
$ goctl model -src={patterns} -dir={dir}
datasource
$ goctl model mysql datasource -url={datasource} -table={patterns} -dir={dir}
or
ddl
$ goctl model -src={patterns} -dir={dir}
datasource
$ goctl model mysql datasource -url={datasource} -table={patterns} -dir={dir}
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,其他的代码均属于业务型代码,这个我觉得开发人员根据业务需要进行编写更好。
类型转换规则
| mysql dataType | golang dataType | golang dataType(if null&&default null) | | —- | —- | —- | | bool | int64 | sql.NullInt64 | | boolean | int64 | sql.NullInt64 | | tinyint | int64 | sql.NullInt64 | | smallint | int64 | sql.NullInt64 | | mediumint | int64 | sql.NullInt64 | | int | int64 | sql.NullInt64 | | integer | int64 | sql.NullInt64 | | bigint | int64 | sql.NullInt64 | | float | float64 | sql.NullFloat64 | | double | float64 | sql.NullFloat64 | | decimal | float64 | sql.NullFloat64 | | date | time.Time | sql.NullTime | | datetime | time.Time | sql.NullTime | | timestamp | time.Time | sql.NullTime | | time | string | sql.NullString | | year | time.Time | sql.NullInt64 | | char | string | sql.NullString | | varchar | string | sql.NullString | | binary | string | sql.NullString | | varbinary | string | sql.NullString | | tinytext | string | sql.NullString | | text | string | sql.NullString | | mediumtext | string | sql.NullString | | longtext | string | sql.NullString | | enum | string | sql.NullString | | set | string | sql.NullString | | json | string | sql.NullString |