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@ -0,0 +1,274 @@
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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/user.sql" -dir="./sql/model" -c=true
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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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```
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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="table1,table2" -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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cacheUserMobilePrefix = "cache#User#mobile#"
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cacheUserIdPrefix = "cache#User#id#"
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cacheUserNamePrefix = "cache#User#name#"
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)
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type (
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UserModel 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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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 string `db:"nickname"` // 用户昵称
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CreateTime time.Time `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, table string) *UserModel {
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return &UserModel{
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CachedConn: sqlc.NewConn(conn, c),
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table: table,
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}
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}
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func (m *UserModel) Insert(data User) (sql.Result, error) {
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query := `insert into ` + m.table + `(` + userRowsExpectAutoSet + `) value (?, ?, ?, ?, ?)`
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return m.ExecNoCache(query, data.Name, data.Password, data.Mobile, data.Gender, data.Nickname)
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}
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func (m *UserModel) 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 := `select ` + userRows + ` from ` + m.table + ` where id = ? limit 1`
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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 *UserModel) 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, func(primary interface{}) string {
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return fmt.Sprintf("%s%v", cacheUserIdPrefix, primary)
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}, func(conn sqlx.SqlConn, v interface{}) (i interface{}, e error) {
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query := `select ` + userRows + ` from ` + m.table + ` where name = ? limit 1`
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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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}, func(conn sqlx.SqlConn, v, primary interface{}) error {
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query := `select ` + userRows + ` from ` + m.table + ` where id = ? limit 1`
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return conn.QueryRow(v, query, primary)
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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 *UserModel) 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, func(primary interface{}) string {
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return fmt.Sprintf("%s%v", cacheUserIdPrefix, primary)
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}, func(conn sqlx.SqlConn, v interface{}) (i interface{}, e error) {
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query := `select ` + userRows + ` from ` + m.table + ` where mobile = ? limit 1`
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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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}, func(conn sqlx.SqlConn, v, primary interface{}) error {
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query := `select ` + userRows + ` from ` + m.table + ` where id = ? limit 1`
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return conn.QueryRow(v, query, primary)
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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 *UserModel) 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 := `update ` + m.table + ` set ` + userRowsWithPlaceHolder + ` where id = ?`
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return conn.Exec(query, 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 *UserModel) 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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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 := `delete from ` + m.table + ` where id = ?`
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return conn.Exec(query, id)
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}, userIdKey, userNameKey, userMobileKey)
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return err
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}
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```
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# 用法
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```
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$ goctl model mysql -h
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```
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```
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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={filename} -dir={dir} -cache=true
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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={tables} -dir={dir} -cache=true
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```
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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={filename} -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={tables} -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={filename} -dir={dir} -cache=false
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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={tables} -dir={dir} -cache=false
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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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# QA
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* goctl model除了命令行模式，支持插件模式吗？
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很快支持idea插件。
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Keson
4 years ago
committed by
GitHub