gosql

A simple sql wrapper provides convenient CRUD operations for struct objects.

Mapping struct fields to sql columns

1. Column name is converted from field name with CamelToSnake pattern by default

2. Custom column name can be declared with sql tag

3. primary key, auto_increment are supported in db tag

4. Use `sql:"-"` to ignore fields

5. Column must be field which can be exported

    type Product struct {
        ID        int `sql:"primary key,auto_increment"`
        Name      string
        Price     float32
        Text      string `sql:"txt"`
        UpdatedAt int64
        
        Ext interface{} `sql:"-"'
    }
   

Table Name

1. Default table name is the plural form of struct name.

   type Product struct's table name is products
type User struct's table name is users

2. Custom table name is provided by TableName method

    type User struct {
        ID int `sql:"primary key"`
        Name string
    }
    
    func (u *User) TableName() string {
        return "users" + fmt.Sprint(u.id%100)
    }
   

Open database

	db, err := NewDBWrapper("mysql", "dbuser:dbpassword@tcp(localhost:3306)/dbname")
	...

Insert

    p := &Product{
        Name:      "apple",
        Price:     0.1,
        Text:      "nice",
        UpdatedAt: time.Now().Unix(),
    }
    db.Insert(p)

Update

    p.Price = 0.2
    db.Update(p)

Save

Save is supported by mysql and sqlite3 drivers. It will insert the record if it does't exist, otherwise update the record.

    p.Price = 0.3
    db.Save(p)
    
    p = &Product{
        Name:      "apple",
        Price:     0.1,
        Text:      "nice",
        UpdatedAt: time.Now().Unix(),
    }
    db.Save(p)

Select

    var products []*Product
    //Select all products
    db.Select(&products)
    
    //Select products whose price is less than 0.2
    db.Select(&products, "price<?", 0.2)

SelectOne

    var p1 *Product
    db.SelectOne(&p1)
 
    var p2 Product
    db.SelectOne(&p2, "id=?", 3)

Specify table name explicitly

    db.Table("products").Insert(p)

Transaction

    tx, err := db.Begin()
    tx.Insert(p1)
    tx.Insert(p2)
    tx.Table("products").Insert(p3)
    tx.Commit()

Support embedded struct

    type Product struct {
        ID        int `sql:"primary key,auto_increment"`
        Name      string
        Price     float32
        Text      string `sql:"txt"`
        UpdatedAt int64
    }
    
    type ProductDetail struct {
        Product
        Detail string
    }

Support json

    type Coordinate struct {
        Lng float
        Lat float
    }
    
    type Topic struct {
        ID          int64
        Title       string
        Location    *Coordinate `sql:"json"`
    }