3.4 多属性递归

查询动态实体

Java

TreeNodeTable table = TreeNodeTable.$;

TreeNode treeNode = sqlClient
    .findById(
        TreeNodeFetcher.$
                .allScalarFields()
                .recursiveParent() ❶ 
                .recursiveChildNodes() ❷,
        10L
    );

Kotlin

val treeNode = sqlClient
    .findById(
        newFetcher(Book::class).by {
            allScalarFields()
                `parent*`() ❶
                `childNodes*`() ❷
        },
        10L
    )

得到如下的数据

{
    "id":10,
    "name":"Woman",
    "parent":{ ❶
        "id":9,
        "name":"Clothing",
        "parent":{ ❶
            "id":1,
            "name":"Home",
            "parent":null ❶
        }
    },
    "childNodes":[ ❷
        {
            "id":11,
            "name":"Casual wear",
            "childNodes":[ ❷
                {
                    "id":12,
                    "name":"Dress",
                    "childNodes":[] ❷
                },
                {
                    "id":13,
                    "name":"Miniskirt",
                    "childNodes":[] ❷
                },
                {
                    "id":14,
                    "name":"Jeans",
                    "childNodes":[] ❷
                }
            ]
        },
        {
            "id":15,
            "name":"Formal wear",
            "childNodes":[ ❷
                {
                    "id":16,
                    "name":"Suit",
                    "childNodes":[] ❷
                },
                {
                    "id":17,
                    "name":"Shirt",
                    "childNodes":[] ❷
                }
            ]
        }
    ]
}

查询静态DTO

在src/main/dto文件夹下新建任何一个扩展名为dto的文件，编辑代码如下

export com.yourcompany.yourproject.model.TreeNode
    -> package com.yourcompany.yourproject.model.dto

RecursiveTreeNodeView {
    #allScalars(this)
    parent* ❶
    childNodes* ❷
}

编译项目，生成Java/Kotlin类型RecursiveTreeNodeView

Java

TreeNodeTable table = TreeNodeTable.$;

RecursiveTreeNodeView treeNode = sqlClient
    .findById(
        RecursiveTreeNodeView.class,
        10L
    );

Kotlin

val treeNode = sqlClient
    .findById(
        RecursiveTreeNodeView::class,
        10L
    )

得到如下数据

RecursiveTreeNodeView(
    id=10, 
    name=Woman, 
    parent=RecursiveTreeNodeView.TargetOf_parent( ❶
        id=9, 
        name=Clothing, 
        parent=RecursiveTreeNodeView.TargetOf_parent( ❶
            id=1, 
            name=Home, 
            parent=null ❶
        )
    ), 
    childNodes=[ ❷
        RecursiveTreeNodeView.TargetOf_childNodes(
            id=11, 
            name=Casual wear, 
            childNodes=[ ❷
                RecursiveTreeNodeView.TargetOf_childNodes(
                    id=12, 
                    name=Dress, 
                    childNodes=[] ❷
                ), 
                RecursiveTreeNodeView.TargetOf_childNodes(
                    id=13, 
                    name=Miniskirt, 
                    childNodes=[] ❷
                ), 
                RecursiveTreeNodeView.TargetOf_childNodes(
                    id=14, 
                    name=Jeans, 
                    childNodes=[] ❷
                )
            ]
        ), 
        RecursiveTreeNodeView.TargetOf_childNodes(
            id=15, 
            name=Formal wear, 
            childNodes=[ ❷
                RecursiveTreeNodeView.TargetOf_childNodes(
                    id=16, 
                    name=Suit, 
                    childNodes=[] ❷
                ), 
                RecursiveTreeNodeView.TargetOf_childNodes(
                    id=17, 
                    name=Shirt, 
                    childNodes=[] ❷
                )
            ]
        )
    ]
)