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README.MD
Sql生成工具说明文档
前言
在当前Sql代码生成工具是基于sqlc生成的逻辑。关键字
- 查询类型(前暂不支持同一字段多种类型混合生成,如按照campus_id查询单结果又查询All或者Limit)
- 单结果查询
- FindOne(主键特有)
- FindOneByXxx
- 多结果查询
- FindAllByXxx
- FindLimitByXxx
- 单结果查询
- withCache
- withoutCache
准备工作
-
table
CREATE TABLE `user_info` ( `id` bigint(20) NOT NULL COMMENT '主键', `campus_id` bigint(20) DEFAULT NULL COMMENT '整校id', `name` varchar(255) DEFAULT NULL COMMENT '用户姓名', `id_number` varchar(255) DEFAULT NULL COMMENT '身份证', `age` int(10) DEFAULT NULL COMMENT '年龄', `gender` tinyint(1) DEFAULT NULL COMMENT '性别,0-男,1-女,2-不限', `mobile` varchar(20) DEFAULT NULL COMMENT '手机号', `create_time` timestamp NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间', `update_time` timestamp NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间', PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
imports生成
imports代码生成对应model中包的引入管理,仅使用于晓黑板项目中(非相对路径动态生成),目前受`withCache`参数的影响,除此之外其实为固定代码。-
withCache
import ( "database/sql""fmt" "strings" "time" "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" "xiao/service/shared/builderx" )
-
withoutCache
import ( "database/sql""fmt" "strings" "time" "github.com/tal-tech/go-zero/core/stores/sqlx" "github.com/tal-tech/go-zero/core/stringx" "xiao/service/shared/builderx" )
vars生成
vars部分对应model中var声明的包含的代码块,由table
名和withCache
来决定其中的代码生成内容,withCache
决定是否要生成缓存key变量的声明。
-
withCache
var ( UserInfoFieldNames = builderx.FieldNames(&UserInfo{}) UserInfoRows = strings.Join(UserInfoFieldNames, ",") UserInfoRowsExpectAutoSet = strings.Join(stringx.Remove(UserInfoFieldNames, "id", "create_time", "update_time"), ",") UserInfoRowsWithPlaceHolder = strings.Join(stringx.Remove(UserInfoFieldNames, "id", "create_time", "update_time"), "=?,") + "=?" cacheUserInfoIdPrefix = "cache#userInfo#id#" cacheUserInfoCampusIdPrefix = "cache#userInfo#campusId#" cacheUserInfoNamePrefix = "cache#userInfo#name#" cacheUserInfoMobilePrefix = "cache#userInfo#mobile#" )
-
withoutCache
var ( UserInfoFieldNames = builderx.FieldNames(&UserInfo{}) UserInfoRows = strings.Join(UserInfoFieldNames, ",") UserInfoRowsExpectAutoSet = strings.Join(stringx.Remove(UserInfoFieldNames, "id", "create_time", "update_time"), ",") UserInfoRowsWithPlaceHolder = strings.Join(stringx.Remove(UserInfoFieldNames, "id", "create_time", "update_time"), "=?,") + "=?" )
types生成
ypes部分对应model中type声明的包含的代码块,由table
名和withCache
来决定其中的代码生成内容,withCache
决定引入sqlc还是sqlx。
-
withCache
type ( UserInfoModel struct { conn sqlc.CachedConn table string } UserInfo struct { Id int64 `db:"id"` // 主键id CampusId int64 `db:"campus_id"` // 整校id Name string `db:"name"` // 用户姓名 IdNumber string `db:"id_number"` // 身份证 Age int64 `db:"age"` // 年龄 Gender int64 `db:"gender"` // 性别,0-男,1-女,2-不限 Mobile string `db:"mobile"` // 手机号 CreateTime time.Time `db:"create_time"` // 创建时间 UpdateTime time.Time `db:"update_time"` // 更新时间 } )
-
withoutCache
type ( UserInfoModel struct { conn sqlx.SqlConn table string } UserInfo struct { Id int64 `db:"id"` // 主键id CampusId int64 `db:"campus_id"` // 整校id Name string `db:"name"` // 用户姓名 IdNumber string `db:"id_number"` // 身份证 Age int64 `db:"age"` // 年龄 Gender int64 `db:"gender"` // 性别,0-男,1-女,2-不限 Mobile string `db:"mobile"` // 手机号 CreateTime time.Time `db:"create_time"` // 创建时间 UpdateTime time.Time `db:"update_time"` // 更新时间 } )
New生成
new生成对应model中struct的New函数,受`withCache`影响决定是否要引入cacheRedis- withCache
func NewUserInfoModel(conn sqlx.SqlConn, c cache.CacheConf, table string) *UserInfoModel { return &UserInfoModel{ CachedConn: sqlc.NewConn(conn, c), table: table, } }
- withoutCache
func NewUserInfoModel(conn sqlx.SqlConn, table string) *UserInfoModel { return &UserInfoModel{conn: conn, table: table} }
FindOne查询生成
FindOne查询代码生成仅对主键有效。如`user_info`中生成的FindOne如下:-
withCache
func (m *UserInfoModel) FindOne(id int64) (*UserInfo, error) { idKey := fmt.Sprintf("%s%v", cacheUserInfoIdPrefix, id) var resp UserInfo err := m.QueryRow(&resp, idKey, func(conn sqlx.SqlConn, v interface{}) error { query := `select ` + userInfoRows + ` 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 } }
-
withoutCache
func (m *UserInfoModel) FindOne(id int64) (*UserInfo, error) { query := `select ` + userInfoRows + ` from ` + m.table + `where id = ? limit 1` var resp UserInfo err := m.conn.QueryRow(&resp, query, id) switch err { case nil: return &resp, nil case sqlx.ErrNotFound: return nil, ErrNotFound default: return nil, err }
FindOneByXxx查询生成
FindOneByXxx查询生成可以按照单个字段查询、多个字段以AND关系且表达式符号为=
的查询(下称:组合查询),对除主键之外的字段有效,对于单个字段可以用withCache
来控制是否需要缓存,这里的缓存只缓存主键,并不缓存整个struct,注意:这里有一个隐藏的规则,如果单个字段查询需要cache,那么主键一定有cache;多个字段组成的组合查询
一律没有缓存处理,且组合查询不能相互嵌套,否则会报circle query with other fields
错误,下面我们按场景来依次查看对应代码生成后的示例。
注:目前暂不支持除equals之外的条件查询。
- 单字段查询
以name查询为例-
withCache
func (m *UserInfoModel) FindOneByName(name string) (*UserInfo, error) { nameKey := fmt.Sprintf("%s%v", cacheUserInfoNamePrefix, name) var id string err := m.GetCache(key, &id) if err != nil { return nil, err } if id != "" { return m.FindOne(id) } var resp UserInfo query := `select ` + userInfoRows + ` from ` + m.table + `where name = ? limit 1` err = m.QueryRowNoCache(&resp, query, name) switch err { case nil: err = m.SetCache(nameKey, resp.Id) if err != nil { logx.Error(err) } return &resp, nil case sqlc.ErrNotFound: return nil, ErrNotFound default: return nil, err } }
-
withoutCache
func (m *UserInfoModel) FindOneByName(name string) (*UserInfo, error) { var resp UserInfo query := `select ` + userInfoRows + ` from ` + m.table + `where name = ? limit 1` err = m.conn.QueryRow(&resp, query, name) switch err { case nil: return &resp, nil case sqlx.ErrNotFound: return nil, ErrNotFound default: return nil, err } }
-
-
组合查询
以campus_id
和id_number
查询为例。``` func (m *UserInfoModel) FindOneByCampusIdAndIdNumber(campusId int64,idNumber string) (*UserInfo, error) { var resp UserInfo query := `select ` + userInfoRows + ` from ` + m.table + `where campus_id = ? AND id_number = ? limit 1` err = m.QueryRowNoCache(&resp, query, campusId, idNumber) // err = m.conn.QueryRows(&resp, query, campusId, idNumber) switch err { case nil: return &resp, nil case sqlx.ErrNotFound: return nil, ErrNotFound default: return nil, err } } ```
FindAllByXxx生成
FindAllByXxx查询和FindOneByXxx功能相似,只是FindOneByXxx限制了limit等于1,而FindAllByXxx是查询所有,以两个例子来说明- 查询单个字段
name
等于某值的所有数据func (m *UserInfoModel) FindAllByName(name string) ([]*UserInfo, error) { var resp []*UserInfo query := `select ` + userInfoRows + ` from ` + m.table + `where name = ?` err := m.QueryRowsNoCache(&resp, query, name) // err := m.conn.QueryRows(&resp, query, name) if err != nil { return nil, err } return resp, nil }
- 查询多个组合字段
campus_id
等于某值且gender
等于某值的所有数据func (m *UserInfoModel) FindAllByCampusIdAndGender(campusId int64,gender int64) ([]*UserInfo, error) { var resp []*UserInfo query := `select ` + userInfoRows + ` from ` + m.table + `where campus_id = ? AND gender = ?` err := m.QueryRowsNoCache(&resp, query, campusId, gender) // err := m.conn.QueryRows(&resp, query, campusId, gender) if err != nil { return nil, err } return resp, nil }
FindLimitByXxx生成
FindLimitByXxx查询和FindAllByXxx功能相似,只是FindAllByXxx限制了limit,除此之外还会生成查询对应Count总数的代码,而FindAllByXxx是查询所有数据,以几个例子来说明- 查询
gender
等于某值的分页数据,按照create_time
降序func (m *UserInfoModel) FindLimitByGender(gender int64, page, limit int) ([]*UserInfo, error) { var resp []*UserInfo query := `select ` + userInfoRows + `from ` + m.table + `where gender = ? order by create_time DESC limit ?,?` err := m.QueryRowsNoCache(&resp, query, gender, (page-1)*limit, limit) // err := m.conn.QueryRows(&resp, query, gender, (page-1)*limit, limit) if err != nil { return nil, err } return resp, nil } func (m *UserInfoModel) FindAllCountByGender(gender int64) (int64, error) { var count int64 query := `select count(1) from ` + m.table + `where gender = ? ` err := m.QueryRowsNoCache(&count, query, gender) // err := m.conn.QueryRow(&count, query, gender) if err != nil { return 0, err } return count, nil }
- 查询
gender
等于某值的分页数据,按照create_time
降序、update_time
生序排序func (m *UserInfoModel) FindLimitByGender(gender int64, page, limit int) ([]*UserInfo, error) { var resp []*UserInfo query := `select ` + userInfoRows + `from ` + m.table + `where gender = ? order by create_time DESC,update_time ASC limit ?,?` err := m.QueryRowsNoCache(&resp, query, gender, (page-1)*limit, limit) // err := m.conn.QueryRows(&resp, query, gender, (page-1)*limit, limit) if err != nil { return nil, err } return resp, nil } func (m *UserInfoModel) FindAllCountByGender(gender int64) (int64, error) { var count int64 query := `select count(1) from ` + m.table + `where gender = ? ` err := m.QueryRowNoCache(&count, query, gender) // err := m.conn.QueryRow(&count, query, gender) if err != nil { return 0, err } return count, nil }
- 查询
gender
等于某值且campus_id
为某值按照create_time
降序的分页数据func (m *UserInfoModel) FindLimitByGenderAndCampusId(gender int64,campusId int64, page, limit int) ([]*UserInfo, error) { var resp []*UserInfo query := `select ` + userInfoRows + `from ` + m.table + `where gender = ? AND campus_id = ? order by create_time DESC limit ?,?` err := m.QueryRowsNoCache(&resp, query, gender, campusId, (page-1)*limit, limit) // err := m.conn.QueryRows(&resp, query, gender, campusId, (page-1)*limit, limit) if err != nil { return nil, err } return resp, nil } func (m *UserInfoModel) FindAllCountByGenderAndCampusId(gender int64,campusId int64) (int64, error) { var count int64 query := `select count(1) from ` + m.table + `where gender = ? AND campus_id = ? ` err := m.QueryRowsNoCache(&count, query, gender, campusId) // err := m.conn.QueryRow(&count, query, gender, campusId) if err != nil { return 0, err } return count, nil }
Delete生成
Delete代码根据`withCache`的不同可以生成带缓存逻辑代码和不带缓存逻辑代码,Delete代码生成仅按照主键删除。从FindOneByXxx方法描述得知,非主键`withCache`了那么主键会强制被cache,因此在delete时也会删除主键cache。-
withCache
根据mobile
查询用户信息func (m *UserInfoModel) Delete(userId int64) error { userIdKey := fmt.Sprintf("%s%v", cacheUserInfoUserIdPrefix, userId) mobileKey := fmt.Sprintf("%s%v", cacheUserInfoMobilePrefix, mobile) _, err := m.Exec(func(conn sqlx.SqlConn) (result sql.Result, err error) { query := `delete from ` + m.table + + `where user_id = ?` return conn.Exec(query, userId) }, userIdKey, mobileKey) return err }
-
withoutCache
func (m *UserInfoModel) Delete(userId int64) error { _, err := m.Exec(func(conn sqlx.SqlConn) (result sql.Result, err error) { query := `delete from ` + m.table + + `where user_id = ?` return conn.Exec(query, userId) }, ) return err
} ```
Insert生成
Update生成
待完善(TODO)
- 同一字段多种查询方式代码生成(优先级较高)
- 条件查询
- 范围查询
- ...
反馈与建议
- 无