# 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 * 通过ddl生成 ```shell script 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。 ```Plain Text model │   ├── error.go │   └── usermodel.go ``` * 通过datasource生成 ```shell script goctl model mysql datasource -url="user:password@tcp(127.0.0.1:3306)/database" -table="*" -dir="./model" ``` * 生成代码示例 ```go package model import ( "database/sql" "fmt" "strings" "time" "git.i2edu.net/i2/go-zero/core/stores/cache" "git.i2edu.net/i2/go-zero/core/stores/sqlc" "git.i2edu.net/i2/go-zero/core/stores/sqlx" "git.i2edu.net/i2/go-zero/core/stringx" "git.i2edu.net/i2/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"), "=?,") + "=?" cacheUserPrefix = "cache#User#user#" cacheUserNamePrefix = "cache#User#name#" cacheUserMobilePrefix = "cache#User#mobile#" cacheUserIdPrefix = "cache#User#id#" ) 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 sql.NullString `db:"nickname"` // 用户昵称 CreateTime sql.NullTime `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) { userKey := fmt.Sprintf("%s%v", cacheUserPrefix, data.User) userNameKey := fmt.Sprintf("%s%v", cacheUserNamePrefix, data.Name) userMobileKey := fmt.Sprintf("%s%v", cacheUserMobilePrefix, data.Mobile) 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) }, userMobileKey, userKey, userNameKey) 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 } userIdKey := fmt.Sprintf("%s%v", cacheUserIdPrefix, id) userKey := fmt.Sprintf("%s%v", cacheUserPrefix, data.User) 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 := fmt.Sprintf("delete from %s where id = ?", m.table) return conn.Exec(query, id) }, userIdKey, userKey, userNameKey, userMobileKey) 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 ```Plain Text goctl model mysql -h ``` ```Plain Text NAME: goctl model mysql - generate mysql model" USAGE: goctl 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 ```shell script goctl model mysql -src={patterns} -dir={dir} -cache ``` help ``` NAME: goctl model mysql ddl - generate mysql model from 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://git.i2edu.net/i2/go-zero/tree/master/tools/goctl/config/readme.md] --cache, -c generate code with cache [optional] --idea for idea plugin [optional] ``` * datasource ```shell script 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://git.i2edu.net/i2/go-zero/tree/master/tools/goctl/config/readme.md] --idea for idea plugin [optional] ``` 示例用法请参考[用法](./example/generator.sh) > 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。 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 ```shell script goctl model -src={patterns} -dir={dir} ``` * datasource ```shell script goctl model mysql datasource -url={datasource} -table={patterns} -dir={dir} ``` or * ddl ```shell script goctl model -src={patterns} -dir={dir} ``` * datasource ```shell script 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 |