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+# ent
+## Introduction
+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。
+
+### init project
+```bash
+go mod init entdemo
+```
+### 创建schema
+在entdemo目录下运行
+```bash
+go run -mod=mod entgo.io/ent/cmd/ent new User
+```
+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：
+```go
+package schema
+
+import "entgo.io/ent"
+
+// User holds the schema definition for the User entity.
+type User struct {
+	ent.Schema
+}
+
+// Fields of the User.
+func (User) Fields() []ent.Field {
+	return nil
+}
+
+// Edges of the User.
+func (User) Edges() []ent.Edge {
+	return nil
+}
+```
+
+### 向User实体中添加字段
+可以向User中添加两个字段，修改`Field`内容为如下：
+```go
+// Fields of the User.
+func (User) Fields() []ent.Field {
+    return []ent.Field{
+        field.Int("age").
+            Positive(),
+        field.String("name").
+            Default("unknown"),
+    }
+}
+```
+
+### go generate
+之后，可以调用`go generate`:
+```bash
+go generate ./ent
+```
+产生内容如下：
+```
+ent
+├── client.go
+├── config.go
+├── context.go
+├── ent.go
+├── generate.go
+├── mutation.go
+... truncated
+├── schema
+│   └── user.go
+├── tx.go
+├── user
+│   ├── user.go
+│   └── where.go
+├── user.go
+├── user_create.go
+├── user_delete.go
+├── user_query.go
+└── user_update.go
+```
+