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# Goctl Model
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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。
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## 快速开始
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* 通过ddl生成
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```shell script
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goctl model mysql ddl -src="./*.sql" -dir="./sql/model" -c
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```
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执行上述命令后即可快速生成CURD代码。
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```Plain Text
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model
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│ ├── error.go
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│ └── usermodel.go
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```
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* 通过datasource生成
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```shell script
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goctl model mysql datasource -url="user:password@tcp(127.0.0.1:3306)/database" -table="*" -dir="./model"
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```
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* 生成代码示例
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```go
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package model
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import (
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"database/sql"
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"fmt"
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"strings"
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"time"
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"github.com/tal-tech/go-zero/core/stores/cache"
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"github.com/tal-tech/go-zero/core/stores/sqlc"
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"github.com/tal-tech/go-zero/core/stores/sqlx"
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"github.com/tal-tech/go-zero/core/stringx"
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"github.com/tal-tech/go-zero/tools/goctl/model/sql/builderx"
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)
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var (
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userFieldNames = builderx.FieldNames(&User{})
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userRows = strings.Join(userFieldNames, ",")
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userRowsExpectAutoSet = strings.Join(stringx.Remove(userFieldNames, "id", "create_time", "update_time"), ",")
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userRowsWithPlaceHolder = strings.Join(stringx.Remove(userFieldNames, "id", "create_time", "update_time"), "=?,") + "=?"
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cacheUserPrefix = "cache#User#user#"
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cacheUserNamePrefix = "cache#User#name#"
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cacheUserMobilePrefix = "cache#User#mobile#"
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cacheUserIdPrefix = "cache#User#id#"
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)
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type (
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UserModel interface {
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Insert(data User) (sql.Result, error)
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FindOne(id int64) (*User, error)
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FindOneByUser(user string) (*User, error)
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FindOneByName(name string) (*User, error)
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FindOneByMobile(mobile string) (*User, error)
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Update(data User) error
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Delete(id int64) error
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}
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defaultUserModel struct {
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sqlc.CachedConn
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table string
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}
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User struct {
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Id int64 `db:"id"`
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User string `db:"user"` // 用户
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Name string `db:"name"` // 用户名称
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Password string `db:"password"` // 用户密码
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Mobile string `db:"mobile"` // 手机号
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Gender string `db:"gender"` // 男｜女｜未公开
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Nickname sql.NullString `db:"nickname"` // 用户昵称
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CreateTime sql.NullTime `db:"create_time"`
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UpdateTime time.Time `db:"update_time"`
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}
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)
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func NewUserModel(conn sqlx.SqlConn, c cache.CacheConf) UserModel {
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return &defaultUserModel{
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CachedConn: sqlc.NewConn(conn, c),
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table: "user",
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}
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}
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func (m *defaultUserModel) Insert(data User) (sql.Result, error) {
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userKey := fmt.Sprintf("%s%v", cacheUserPrefix, data.User)
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userNameKey := fmt.Sprintf("%s%v", cacheUserNamePrefix, data.Name)
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userMobileKey := fmt.Sprintf("%s%v", cacheUserMobilePrefix, data.Mobile)
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ret, err := m.Exec(func(conn sqlx.SqlConn) (result sql.Result, err error) {
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query := fmt.Sprintf("insert into %s (%s) values (?, ?, ?, ?, ?, ?)", m.table, userRowsExpectAutoSet)
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return conn.Exec(query, data.User, data.Name, data.Password, data.Mobile, data.Gender, data.Nickname)
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}, userMobileKey, userKey, userNameKey)
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return ret, err
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}
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func (m *defaultUserModel) FindOne(id int64) (*User, error) {
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userIdKey := fmt.Sprintf("%s%v", cacheUserIdPrefix, id)
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var resp User
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err := m.QueryRow(&resp, userIdKey, func(conn sqlx.SqlConn, v interface{}) error {
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query := fmt.Sprintf("select %s from %s where id = ? limit 1", userRows, m.table)
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return conn.QueryRow(v, query, id)
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})
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switch err {
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case nil:
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return &resp, nil
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case sqlc.ErrNotFound:
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return nil, ErrNotFound
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default:
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return nil, err
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}
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}
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func (m *defaultUserModel) FindOneByUser(user string) (*User, error) {
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userKey := fmt.Sprintf("%s%v", cacheUserPrefix, user)
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var resp User
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err := m.QueryRowIndex(&resp, userKey, m.formatPrimary, func(conn sqlx.SqlConn, v interface{}) (i interface{}, e error) {
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query := fmt.Sprintf("select %s from %s where user = ? limit 1", userRows, m.table)
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if err := conn.QueryRow(&resp, query, user); err != nil {
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return nil, err
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}
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return resp.Id, nil
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}, m.queryPrimary)
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switch err {
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case nil:
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return &resp, nil
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case sqlc.ErrNotFound:
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return nil, ErrNotFound
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default:
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return nil, err
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}
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}
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func (m *defaultUserModel) FindOneByName(name string) (*User, error) {
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userNameKey := fmt.Sprintf("%s%v", cacheUserNamePrefix, name)
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var resp User
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err := m.QueryRowIndex(&resp, userNameKey, m.formatPrimary, func(conn sqlx.SqlConn, v interface{}) (i interface{}, e error) {
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query := fmt.Sprintf("select %s from %s where name = ? limit 1", userRows, m.table)
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if err := conn.QueryRow(&resp, query, name); err != nil {
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return nil, err
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}
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return resp.Id, nil
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}, m.queryPrimary)
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switch err {
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case nil:
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return &resp, nil
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case sqlc.ErrNotFound:
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return nil, ErrNotFound
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default:
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return nil, err
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}
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}
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func (m *defaultUserModel) FindOneByMobile(mobile string) (*User, error) {
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userMobileKey := fmt.Sprintf("%s%v", cacheUserMobilePrefix, mobile)
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var resp User
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err := m.QueryRowIndex(&resp, userMobileKey, m.formatPrimary, func(conn sqlx.SqlConn, v interface{}) (i interface{}, e error) {
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query := fmt.Sprintf("select %s from %s where mobile = ? limit 1", userRows, m.table)
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if err := conn.QueryRow(&resp, query, mobile); err != nil {
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return nil, err
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}
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return resp.Id, nil
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}, m.queryPrimary)
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switch err {
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case nil:
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return &resp, nil
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case sqlc.ErrNotFound:
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return nil, ErrNotFound
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default:
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return nil, err
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}
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}
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func (m *defaultUserModel) Update(data User) error {
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userIdKey := fmt.Sprintf("%s%v", cacheUserIdPrefix, data.Id)
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_, err := m.Exec(func(conn sqlx.SqlConn) (result sql.Result, err error) {
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query := fmt.Sprintf("update %s set %s where id = ?", m.table, userRowsWithPlaceHolder)
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return conn.Exec(query, data.User, data.Name, data.Password, data.Mobile, data.Gender, data.Nickname, data.Id)
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}, userIdKey)
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return err
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}
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func (m *defaultUserModel) Delete(id int64) error {
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data, err := m.FindOne(id)
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if err != nil {
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return err
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}
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userIdKey := fmt.Sprintf("%s%v", cacheUserIdPrefix, id)
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userKey := fmt.Sprintf("%s%v", cacheUserPrefix, data.User)
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userNameKey := fmt.Sprintf("%s%v", cacheUserNamePrefix, data.Name)
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userMobileKey := fmt.Sprintf("%s%v", cacheUserMobilePrefix, data.Mobile)
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_, err = m.Exec(func(conn sqlx.SqlConn) (result sql.Result, err error) {
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query := fmt.Sprintf("delete from %s where id = ?", m.table)
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return conn.Exec(query, id)
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}, userIdKey, userKey, userNameKey, userMobileKey)
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return err
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}
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func (m *defaultUserModel) formatPrimary(primary interface{}) string {
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return fmt.Sprintf("%s%v", cacheUserIdPrefix, primary)
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}
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func (m *defaultUserModel) queryPrimary(conn sqlx.SqlConn, v, primary interface{}) error {
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query := fmt.Sprintf("select %s from %s where id = ? limit 1", userRows, m.table)
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return conn.QueryRow(v, query, primary)
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}
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```
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## 用法
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```Plain Text
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goctl model mysql -h
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```
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```Plain Text
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NAME:
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goctl model mysql - generate mysql model"
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USAGE:
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goctl model mysql command [command options] [arguments...]
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COMMANDS:
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ddl generate mysql model from ddl"
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datasource generate model from datasource"
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OPTIONS:
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--help, -h show help
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```
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## 生成规则
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* 默认规则
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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。
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* 带缓存模式
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* ddl
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```shell script
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goctl model mysql -src={patterns} -dir={dir} -cache
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```
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help
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```
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NAME:
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goctl model mysql ddl - generate mysql model from ddl
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USAGE:
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goctl model mysql ddl [command options] [arguments...]
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OPTIONS:
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--src value, -s value the path or path globbing patterns of the ddl
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--dir value, -d value the target dir
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--style value the file naming format, see [https://github.com/tal-tech/go-zero/tree/master/tools/goctl/config/readme.md]
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--cache, -c generate code with cache [optional]
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--idea for idea plugin [optional]
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```
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* datasource
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```shell script
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goctl model mysql datasource -url={datasource} -table={patterns} -dir={dir} -cache=true
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```
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help
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```
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NAME:
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goctl model mysql datasource - generate model from datasource
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USAGE:
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goctl model mysql datasource [command options] [arguments...]
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OPTIONS:
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--url value the data source of database,like "root:password@tcp(127.0.0.1:3306)/database
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--table value, -t value the table or table globbing patterns in the database
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--cache, -c generate code with cache [optional]
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--dir value, -d value the target dir
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--style value the file naming format, see [https://github.com/tal-tech/go-zero/tree/master/tools/goctl/config/readme.md]
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--idea for idea plugin [optional]
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```
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示例用法请参考[用法](./example/generator.sh)
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> NOTE: goctl model mysql ddl/datasource 均新增了一个`--style`参数，用于标记文件命名风格。
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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。
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* 不带缓存模式
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* ddl
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```shell script
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goctl model -src={patterns} -dir={dir}
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```
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* datasource
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```shell script
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goctl model mysql datasource -url={datasource} -table={patterns} -dir={dir}
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```
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or
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* ddl
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```shell script
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goctl model -src={patterns} -dir={dir}
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```
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* datasource
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```shell script
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goctl model mysql datasource -url={datasource} -table={patterns} -dir={dir}
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```
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生成代码仅基本的CURD结构。
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## 缓存
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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。
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* 缓存会缓存哪些信息？
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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。
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* 数据有更新（`update`）操作会清空缓存吗？
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会，但仅清空主键缓存的信息，why？这里就不做详细赘述了。
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* 为什么不按照单索引字段生成`updateByXxx`和`deleteByXxx`的代码？
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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。
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* 为什么不支持`findPageLimit`、`findAll`这么模式代码生层？
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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。
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# 类型转换规则
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| mysql dataType | golang dataType | golang dataType(if null&&default null) |
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|----------------|-----------------|----------------------------------------|
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| bool | int64 | sql.NullInt64 |
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| boolean | int64 | sql.NullInt64 |
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| tinyint | int64 | sql.NullInt64 |
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| smallint | int64 | sql.NullInt64 |
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| mediumint | int64 | sql.NullInt64 |
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| int | int64 | sql.NullInt64 |
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| integer | int64 | sql.NullInt64 |
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| bigint | int64 | sql.NullInt64 |
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| float | float64 | sql.NullFloat64 |
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| double | float64 | sql.NullFloat64 |
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| decimal | float64 | sql.NullFloat64 |
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| date | time.Time | sql.NullTime |
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| datetime | time.Time | sql.NullTime |
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| timestamp | time.Time | sql.NullTime |
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| time | string | sql.NullString |
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| year | time.Time | sql.NullInt64 |
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| char | string | sql.NullString |
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| varchar | string | sql.NullString |
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| binary | string | sql.NullString |
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| varbinary | string | sql.NullString |
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| tinytext | string | sql.NullString |
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| text | string | sql.NullString |
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| mediumtext | string | sql.NullString |
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| longtext | string | sql.NullString |
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| enum | string | sql.NullString |
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| set | string | sql.NullString |
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| json | string | sql.NullString | |