DgraphMapper封装Upsert方法

[wangyuheng]

背景

DgraphMapper提供了query和mutation方法，但是涉及到var的使用，需要同时提供query和mutation。比如: 某个记录的字段+1， 需要执行

upsert {
  query {
            q(func: uid($id)) {
                v as uid
                usageCount as PROJECT.usageCount
                u as math(usageCount+1)
            }
  }
  mutation {
    set {
      uid(v) <PROJECT.usageCount> val(u) .
    }
  }
}

方案

通过扩展xml中标签实现

<upsert id="testUpsert">
    <query id="testQuery">
        query {
            q(func: uid($id)) {
                v as uid
                usageCount as PROJECT.usageCount
                u as math(usageCount+1)
            }
        }
    </query>
    <mutation id="updateStatus">
        <![CDATA[
            uid(v) <PROJECT.usageCount> val(u) .
        ]]>
    </mutation>
</upsert>

验收

通过xml完成upsert