78 lines
1.5 KiB
Markdown
78 lines
1.5 KiB
Markdown
# ent
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## Introduction
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ent是一个简单、功能强大的entity framework。下面，将会是一个ent的使用示例。
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### init project
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```bash
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go mod init entdemo
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```
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### 创建schema
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在entdemo目录下运行
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```bash
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go run -mod=mod entgo.io/ent/cmd/ent new User
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```
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上述命令会为`User`创建schema，创建位置位于`entdemo/ent/schema`目录下，`entdemo/ent/schema/user.go`文件内容如下：
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```go
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package schema
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import "entgo.io/ent"
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// User holds the schema definition for the User entity.
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type User struct {
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ent.Schema
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}
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// Fields of the User.
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func (User) Fields() []ent.Field {
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return nil
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}
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// Edges of the User.
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func (User) Edges() []ent.Edge {
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return nil
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}
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```
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### 向User实体中添加字段
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可以向User中添加两个字段，修改`Field`内容为如下：
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```go
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// Fields of the User.
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func (User) Fields() []ent.Field {
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return []ent.Field{
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field.Int("age").
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Positive(),
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field.String("name").
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Default("unknown"),
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}
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}
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```
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### go generate
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之后，可以调用`go generate`:
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```bash
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go generate ./ent
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```
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产生内容如下：
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```
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ent
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├── client.go
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├── config.go
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├── context.go
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├── ent.go
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├── generate.go
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├── mutation.go
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... truncated
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├── schema
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│ └── user.go
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├── tx.go
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├── user
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│ ├── user.go
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│ └── where.go
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├── user.go
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├── user_create.go
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├── user_delete.go
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├── user_query.go
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└── user_update.go
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```
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