go-models-mysql  - go-models-mysql

失忆症 2019-12-25 13:18:06
# go-models-mysql `go-models-mysql` its lite and easy model. ## Features * Field scanning has become easier since the original driver was extended. Assumption: we have 5 fields to scan ```go type Tb struct { field0 sql.NullString, field1 sql.NullString, field2 sql.NullString, field3 sql.NullString, field4 sql.NullString, } ``` In original driver, it can't dynamic. how many fields, that you must write fields many how. if you have 20 fileds, you must write 20 times. ```go var tb Tb err = rows.Scan(&tb.field0, &tb.field1, &tb.field2, &tb.field3, &tb.field4) ``` In go-models-mysql , you just fill struct nil pointer. ```go if val, err = myDao.ScanRowType(row, (*Tb)(nil)); err == nil { u, _ := val.(*Tb) fmt.Println("Tb", u) } ``` * DAO layer let you operate mysql more Intuitively. * Original driver (sql.DB) was extended, so you can operate original commands. * ex: Query, QueryRow, Exec .... * Import the sqlbuilder that help access sql db easily. ```go myDao.Select("Host", "User", "Select_priv").From("user").Where("User='root'").Limit(1) ``` * Set the default table in DAO, that you can design your dao layer friendly. ```go // set a struct for dao as default model (option) // (*UserTb)(nil) : nil pointer of the UserTb struct // "user" : is real table name in the db myUserDao.SetDefaultModel((*UserTb)(nil), "user") // call model's Get() , get all rows in user table // return (rows *sql.Rows, err error) rows, err = myDao.Get() ``` ## Requirements * Go 1.12 or higher. * [database/sql](https://golang.org/pkg/database/sql/) package * [go-sql-driver/mysql](https://github.com/go-sql-driver/mysql) package ## Go-Module create `go.mod` file in your package folder, and fill below ``` module github.com/eehsiao/go-models-example go 1.13 require ( github.com/eehsiao/go-models-lib latest github.com/eehsiao/go-models-mysql latest github.com/eehsiao/go-models-redis latest github.com/eehsiao/sqlbuilder latest github.com/go-sql-driver/mysql v1.4.1 ) ``` ## Docker Easy to start the test evn. That you can run the example code. ```bash $ docker-compose up -d ``` ## Usage ```go import ( "database/sql" "fmt" mysql "github.com/eehsiao/go-models-mysql" redis "github.com/eehsiao/go-models-redis" ) // UserTb : sql table struct that to store into mysql type UserTb struct { Host sql.NullString `TbField:"Host"` User sql.NullString `TbField:"User"` SelectPriv sql.NullString `TbField:"Select_priv"` } //new mysql dao myUserDao := &MyUserDao{ Dao: mysql.NewDao().SetConfig("root", "mYaDmin", "127.0.0.1:3306", "mysql").OpenDB(), } // example 1 : directly use the sqlbuilder myUserDao.Select("Host", "User", "Select_priv").From("user").Where("User='root'").Limit(1) fmt.Println("sqlbuilder", myUserDao.BuildSelectSQL()) if row, err = myUserDao.GetRow(); err == nil { if val, err = myUserDao.ScanRowType(row, (*UserTb)(nil)); err == nil { u, _ := val.(*UserTb) fmt.Println("UserTb", u) } } // set a struct for dao as default model (option) // (*UserTb)(nil) : nil pointer of the UserTb struct // "user" : is real table name in the db myUserDao.SetDefaultModel((*UserTb)(nil), "user") // call model's Get() , get all rows in user table // return (rows *sql.Rows, err error) rows, err = myDao.Get() // call model's GetRow() , get first row in user rows // return (row *sql.Row, err error) row, err = myDao.GetRow() ``` ## Example ### 1 build-in [example.go](https://github.com/eehsiao/go-models/blob/master/example/example.go) The example will connect to local mysql and get user data. Then connect to local redis and set user data, and get back. ### 2 example `https://github.com/eehsiao/go-models-example/` ## How-to How to design model data logical ### MySQL #### 1. create a table struct, and add the tag `TbField:"real table filed"` `TbField` the tag is musted. `read table filed` also be same the table field. ```go type UserTb struct { Host sql.NullString `TbField:"Host"` User sql.NullString `TbField:"User"` SelectPriv sql.NullString `TbField:"Select_priv"` } ``` #### 2. use Struce4QuerySlice to gen the sqlbuilder select fields ```go m := mysql.NewDao().SetConfig("root", "mYaDmin", "127.0.0.1:3306", "mysql").OpenDB() m.Select(lib.Struce4QuerySlice(m.DaoStructType)...).From(m.TbName).Limit(3) ``` #### 3. scan the sql result to the struct of object ```go row, err = m.GetRow() if val, err = m.ScanRowType(row, (*UserTb)(nil)); err == nil { u, _ := val.(*UserTb) fmt.Println("UserTb", u) } ```
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