# gosql

**Repository Path**: tiHthhh/gosql

## Basic Information

- **Project Name**: gosql
- **Description**: 基于sqlx封装的golang数据库操作
- **Primary Language**: Go
- **License**: MIT
- **Default Branch**: master
- **Homepage**: https://github.com/ilibs/gosql
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 15
- **Created**: 2018-10-26
- **Last Updated**: 2020-12-19

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# gosql
The package based on [sqlx](https://github.com/jmoiron/sqlx), It's simple and keep simple

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## Usage

Connection database and use sqlx original function,See the https://github.com/jmoiron/sqlx

```go
import (
    _ "github.com/go-sql-driver/mysql" //mysql driver
    "github.com/ilibs/gosql"
)

func main(){
    configs := make(map[string]*gosql.Config)

    configs["default"] = &gosql.Config{
        Enable:  true,
        Driver:  "mysql",
        Dsn:     "root:123456@tcp(127.0.0.1:3306)/test?charset=utf8&parseTime=True&loc=Asia%2FShanghai",
        ShowSql: true,
    }

    //connection database
    gosql.Connect(configs)

    gosql.DB().QueryRowx("select * from users where id = 1")
}

```

Use `default` database, So you can use wrapper function

```go
//Exec
gosql.Exec("insert into users(name,email,created_at,updated_at) value(?,?,?,?)","test","test@gmail.com",time.Now(),time.Now())

//Queryx
rows,err := gosql.Queryx("select * from users")
for rows.Next() {
    user := &Users{}
    err = rows.StructScan(user)
}

//QueryRowx
user := &Users{}
err := gosql.QueryRowx("select * from users where id = ?",1).StructScan(user)

//Get
user := &Users{}
err := gosql.Get(user,"select * from users where id = ?",1)

//Select
users := make([]*Users)
err := gosql.Select(&users,"select * from users")

//Change database
db := gosql.Use("test")
db.Queryx("select * from tests")
```

## Using struct

```go
type Users struct {
	Id        int       `db:"id"`
	Name      string    `db:"name"`
	Email     string    `db:"email"`
	Status    int       `db:"status"`
	CreatedAt time.Time `db:"created_at"`
	UpdatedAt time.Time `db:"updated_at"`
}

func (u *Users) DbName() string {
	return "default"
}

func (u *Users) TableName() string {
	return "users"
}

func (u *Users) PK() string {
	return "id"
}

//Get
user := &Users{}
gosql.Model(user).Where("id=?",1).Get()

//All
user := make([]*Users,0)
gosql.Model(&user).All()

//Create and auto set CreatedAt
gosql.Model(&User{Name:"test",Email:"test@gmail.com"}).Create()

//Update
gosql.Model(&User{Name:"test2",Email:"test@gmail.com"}).Where("id=?",1).Update()
//If you need to update the zero value, you can do so
gosql.Model(&User{Status:0}).Where("id=?",1).Update("status")

//Delete
gosql.Model(&User{}).Where("id=?",1).Delete()

```

If you use struct to generate where conditions

```go
//Get where id = 1 and name = "test1"
user := &Users{Id:1,Name:"test1"}
gosql.Model(&user).Get()

//Update default use primary key as the condition
gosql.Model(&User{Id:1,Name:"test2"}).Update()
//Use custom conditions
//Builder => UPDATE users SET `id`=?,`name`=?,`updated_at`=? WHERE (status = ?)
gosql.Model(&User{Id:1,Name:"test2"}).Where("status = ?",1).Update()

//Delete
gosql.Model(&User{Id:1}).Delete()
```

But the zero value is filtered by default, you can specify fields that are not filtered. For example

```go
user := &Users{Id:1,Status:0}
gosql.Model(&user).Get("status")
```

> You can use the [genstruct](https://github.com/fifsky/genstruct) tool to quickly generate database structs

## Transaction
The `Tx` function has a callback function, if an error is returned, the transaction rollback

```go
gosql.Tx(func(tx *sqlx.Tx) error {
    for id := 1; id < 10; id++ {
        user := &Users{
            Id:    id,
            Name:  "test" + strconv.Itoa(id),
            Email: "test" + strconv.Itoa(id) + "@test.com",
        }

        gosql.Model(user, tx).Create()

        if id == 8 {
            return errors.New("interrupt the transaction")
        }
    }

    //query with transaction
    var num int
    err := gosql.WithTx(tx).QueryRowx("select count(*) from user_id = 1").Scan(&num)

    if err != nil {
        return err
    }

    return nil
})
```

> If you need to invoke context, you can use `gosql.Txx`

## Automatic time
If your fields contain the following field names, they will be updated automatically

```
AUTO_CREATE_TIME_FIELDS = []string{
    "create_time",
    "create_at",
    "created_at",
    "update_time",
    "update_at",
    "updated_at",
}
AUTO_UPDATE_TIME_FIELDS = []string{
    "update_time",
    "update_at",
    "updated_at",
}
```


## Using Map
`Create` `Update` `Delete` `Count` support `map[string]interface`,For example:
```go
//Create
gosql.Table("users").Create(map[string]interface{}{
    "id":         1,
    "name":       "test",
    "email":      "test@test.com",
    "created_at": "2018-07-11 11:58:21",
    "updated_at": "2018-07-11 11:58:21",
})

//Update
gosql.Table("users").Where("id = ?", 1).Update(map[string]interface{}{
    "name":  "fifsky",
    "email": "fifsky@test.com",
})

//Delete
gosql.Table("users").Where("id = ?", 1).Delete()

//Count
gosql.Table("users").Where("id = ?", 1).Count()

//Change database
gosql.Use("db2").Table("users").Where("id = ?", 1).Count()

//Transaction `tx` is *sqlx.Tx
gosql.Table("users",tx).Where("id = ?", 1}).Count()
```


## sql.Null*
Now Model support sql.Null* field's, Note, however, that if sql.Null* is also filtered by zero values,For example

```go
type Users struct {
	Id          int            `db:"id"`
	Name        string         `db:"name"`
	Email       string         `db:"email"`
	Status      int            `db:"status"`
	SuccessTime sql.NullString `db:"success_time" json:"success_time"`
	CreatedAt   time.Time      `db:"created_at" json:"created_at"`
	UpdatedAt   time.Time      `db:"updated_at" json:"updated_at"`
}

user := &Users{
    Id: 1,
    SuccessTime: sql.NullString{
        String: "2018-09-03 00:00:00",
        Valid:  false,
    }
}

err := Model(user).Get()
```

Builder SQL:

```
Query: SELECT * FROM users WHERE (id=?);
Args:  []interface {}{1}
Time:  0.00082s
```

If `sql.NullString` of `Valid` attribute is false, SQL builder will ignore this zero value


## Hooks
Hooks are functions that are called before or after creation/querying/updating/deletion.

If you have defiend specified methods for a model, it will be called automatically when creating, updating, querying, deleting, and if any callback returns an error, `gosql` will stop future operations and rollback current transaction.

```
// begin transaction
BeforeChange
BeforeCreate
// update timestamp `CreatedAt`, `UpdatedAt`
// save
AfterCreate
AfterChange
// commit or rollback transaction
```
Example:

```go
func (u *Users) BeforeCreate() (err error) {
  if u.IsValid() {
    err = errors.New("can't save invalid data")
  }
  return
}

func (u *Users) AfterCreate(tx *sqlx.tx) (err error) {
  if u.Id == 1 {
    u.Email = "after@test.com"
    Model(u,tx).Update()
  }
  return
}
```

> BeforeChange and AfterChange only  used in create/update/delete

All Hooks:

```
BeforeChange
AfterChange
BeforeCreate
AfterCreate
BeforeUpdate
AfterUpdate
BeforeDelete
AfterDelete
BeforeFind
AfterFind
```

Hook func type supports multiple ways:

```
func (u *Users) BeforeCreate()
func (u *Users) BeforeCreate() (err error)
func (u *Users) BeforeCreate(tx *sqlx.Tx)
func (u *Users) BeforeCreate(tx *sqlx.Tx) (err error)
```


## Thanks

sqlx https://github.com/jmoiron/sqlx