1. Basic configuration
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1. Install dependencies
// orm链接库 go get github.com/astaxie/beego/orm // 使用的数据库 go get github.com/go-sql-driver/mysql -
2.
main.goAdd ainitmethod to the file to connect to the databasefunc init() { orm.RegisterDriver("mysql", orm.DRMySQL) // default必须要有,表示连接的数据库别名,可能是多个 orm.RegisterDataBase("default", "mysql", "用户名:密码@tcp(localhost:3306)/数据库名?charset=utf8mb4&parseTime=True&loc=Local") } -
3. Note that
main.gosuch a package must be added to the file, otherwise an error will be reportedimport ( ... _ "github.com/go-sql-driver/mysql" ) -
4. Define a data model
package models import "github.com/astaxie/beego/orm" type User struct { Id int Name string Age int Address string } //自定义表名,可以不写的会默认以下划线来分割驼峰命名的 func (self *User) TableName () string { return "user" } func init() { orm.RegisterModel(new(User)) } -
5. Manually create a database and
userdata table -
6. Use the data model in the controller to insert data
package ormDemo import ( "demo01/models" "fmt" "github.com/astaxie/beego" "github.com/astaxie/beego/orm" ) type UserController struct { beego.Controller } func (self *UserController) Get() { o := orm.NewOrm() //默认使用default，这里可以不用写 //o.Using("default") user := models.User{ Name: "张三", Age: 20, Address: "广东"} id, err := o.Insert(&user) fmt.Println(id) fmt.Println(err) self.TplName = "orm.html" } -
7. View database data
2. Some knowledge supplements about the model
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1. About the default table name
- In addition to the initial capital letters, _ will be increased when encountering capital letters, and the underscore in the original name will be retained
- Custom table name is the rewrite
TableNamemethod
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2. Custom field name
type User struct { Id int Name string `orm:"column(user_name)"` // 在go代码中用的是Name,在数据库存的是user_name Age int Address string } -
3. Set parameters
type User struct { Id int `orm:"pk" "auto"` // 设置主键且自动增长 ... } -
4. Ignore fields
type User struct { ... Address string `orm:"-"` } -
5. A relatively complete model
/** 注意beego中创建的表都是非空的,除非自己先指定null */ type User struct { Id int `json:"id" orm:"pk;auto;description(主键id)"` // 设置主键且自动增长 Name string `json:"name" orm:"index;unique;size(50);description(用户名)"` // 唯一的且加了索引的 Age int `json:"age" orm:"default(0);description(年龄)"` Salary float64 `json:"price" orm:"digits(12);decimals(2);description(薪资)"` Address string `json:"address" orm:"size(100);null;column(address);description(地址)"` // 可以为空 // 创建时间字段 CreateAt *time.Time `json:"create_at" orm:"auto_now_add;type(datetime);description(创建时间)"` UpdateAt *time.Time `json:"update_at" orm:"auto_now;type(datetime);description(更新时间)"` }
Three, insert data
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1. Use a
Insertsimple insert of a piece of datafunc (self *UserController) Get() { o := orm.NewOrm() //默认使用default，这里可以不用写 //o.Using("default") user := models.User{ Name: "张三", Age: 20, Address: "广东"} id, err := o.Insert(&user) fmt.Println(id) fmt.Println(err) self.TplName = "orm.html" } -
2. Use to
InsertMultiinsert multiple datafunc (self *UserController) Get() { // 插入多条数据 o := orm.NewOrm() users := []models.User{ { Name: "李四", Age: 20, Address: "湖南"}, { Name: "王五", Age: 30, Address: "广西"}} //InsertMulti第一个参数表示一次可以插入100条数据 count, err := o.InsertMulti(100, &users) fmt.Println(count) fmt.Println(err) self.TplName = "orm.html" }
Four, delete data
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1. Delete according to the field
func (self *UserController) Get() { //根据字段删除数据 o := orm.NewOrm() user := models.User{ Name: "水痕"} num, err := o.Delete(&user, "Name") fmt.Println(num, err) self.TplName = "orm.html" } -
2.
IDDelete according tofunc (self *UserController) Get() { //根据字段删除数据 o := orm.NewOrm() user := models.User{ Id: 1} // 根据ID删除可以不用写这个 num, err := o.Delete(&user) fmt.Println(num, err) self.TplName = "orm.html" }
Five, update data
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1. Update the data directly
func (self *UserController) Get() { //更新数据 o := orm.NewOrm() // 先查找到数据 user := models.User{ Name: "张三"} err := o.Read(&user, "Name") if err == nil { // 修改了什么就更新什么 user.Name = "哈哈" user.Address = "南山" num, err := o.Update(&user) print("受影响的行数", num) fmt.Println(err) } self.TplName = "orm.html" } -
2. Specify the updated field
func (self *UserController) Get() { //更新数据 o := orm.NewOrm() user := models.User{ Name: "张三"} err := o.Read(&user, "Name") if err == nil { user.Name = "哈哈11" user.Address = "南山" // 只更新Name字段,不更新Address字段 num, err := o.Update(&user, "Name") print("受影响的行数", num) fmt.Println(err) } self.TplName = "orm.html" }
Six, query data
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1. Use
Readtoidquery data based on fieldsfunc (self *UserController) Get() { // 根据id查询字段 o := orm.NewOrm() user := models.User{ Id: 1} o.Read(&user) fmt.Println("查询到的数据", user) self.TplName = "orm.html" } -
2. Query according to the specified field
func (self *UserController) Get() { //根据别的字段去查询 o := orm.NewOrm() user := models.User{ Name: "张三"} o.Read(&user, "Name") fmt.Println("一个字段查询", user) user1 := models.User{ Name: "王五", Address: "广西"} o.Read(&user1, "Name", "Address") fmt.Println("多个字段查询", user1) self.TplName = "orm.html" } -
3. Query and create (when you query, if you find that there is no database, create it, and query if there is any)
func (self *UserController) Get() { //查询和创建 // 查询一个已经有的数据 o := orm.NewOrm() user := models.User{ Name: "王五", Age: 30, Address: "广西"} is_new, id, err := o.ReadOrCreate(&user, "Name", "Age", "Address") fmt.Println("第一次结果", is_new, id, err) //查询一个没有的数据 user1 := models.User{ Name: "王二", Age: 30, Address: "湖北"} is_new1, id1, err1 := o.ReadOrCreate(&user1, "Name", "Age", "Address") fmt.Println("第二次结果", is_new1, id1, err1) self.TplName = "orm.html" } // 结果 // 第一次结果 false 3 <nil> // 第二次结果 true 4 <nil>
Seven, on the way to use the command
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1.
main.goOpen the command to build a table infunc main() { //全局开启打印sql模式 orm.Debug = true //开始数据迁移 orm.RunCommand() beego.Run() } -
2. You must register first when creating a model
// 模型中 func init() { orm.RegisterModel(new(User)) } -
3. Run the command
go run main.go orm // 查看有什么命令 go run mian.go orm syncdb // 将数据模型同步到数据库 -
,
ormA little question about- Now you can only synchronize the data table once. If you add or remove fields to the model, you cannot synchronize to the database. This is a lack of design and may be improved in the future.
- Personally suggest that at this stage, we still use manual creation of the table, and then write the model according to the data table