# 分页排序对象

## 定义

`PageQuery`实现了`Query`接口，定义了三个字段， 其中，`PageNumber`和`PageSize`用于构建分页子句，`Sort` 用于构建排序子句。

```go
package core

type PageQuery struct {
	PageNumber *int    `json:"page,omitempty"`
	PageSize   *int    `json:"size,omitempty"`
	Sort       *string `json:"sort,omitempty"`
}
```

## 分页示例

```go
userQuery := UserQuery{PageQuery: PageQuery{}}
users, err := userDataAccess.Query(ctx, userQuery)
//SELECT id, score, memo FROM User

userQuery := UserQuery{PageQuery: PageQuery{PageSize: P(20)}}
users, err := userDataAccess.Query(ctx, userQuery)
//SELECT id, score, memo FROM User LIMIT 20 OFFSET 0

// When only PageNumber is set, PageSize will be set to 10
userQuery := UserQuery{PageQuery: PageQuery{PageNumber: P(5)}}
users, err := userDataAccess.Query(ctx, userQuery)
//SELECT id, score, memo FROM User LIMIT 10 OFFSET 40

userQuery := UserQuery{PageQuery: PageQuery{PageSize: P(50), PageNumber: P(3)}}
users, err := userDataAccess.Query(ctx, userQuery)
//SELECT id, score, memo FROM User LIMIT 10 OFFSET 100	
```

## 排序示例

`Sort`赋值的字符串需要符合正则表达式：`regexp.MustCompile("(?i)(\w+)(,(asC|dEsc))?;?")`

```go
userQuery := UserQuery{PageQuery: PageQuery{Sort: P("id,desc;score,asc;memo")}}
users, err := userDataAccess.Query(ctx, userQuery)
//SELECT id, score, memo FROM User ORDER BY id DESC, score ASC, memo
```


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