mongoose数据查询or、and、where等用法

比眉伴天荒 2022-11-13 11:25 355阅读 0赞

## or ##

为 `$or` 条件指定参数；

//member = ["zhangsan", "lisi", "wangwu"];
    let filter = {
        
      $or: [
        {
        docKey: "public"},
        {
        owner: "zhangsan"},
        {
        member: "lisi"}
      ]
    }
    db.getCollection('docs').find(filter);

1.  数据筛选or是或查询
2.  满足下面的条件其中之一就可以查询出相关数据
3.  如果数据库参数是数组，直接会从数组里面匹配是否包含相关数据 如上：member

## and ##

为 `$and` 条件指定参数；

let filter = {
        
      $and: [
        {
        docKey: "public"},
        {
        owner: "zhangsan"}
      ]
    }
    db.getCollection('docs').find(filter);

直译：

> docKey == “public” && owner == “zhangsan”

需要满足枚举的两个条件才能筛选出相应数据；

### and与or联合使用 ###

let filter = {
        
      $or: [
              {
        
                  docKey: "public"
              },
              {
        
                  $and: [{
        docKey: "private"}, {
        $or:[{
        member: "zhangsan"}, {
        owner: "lisi"}]}]
              }
          ]
    }
    db.getCollection('docs').find(filter);

直译：

> docKey == “public” || (docKey == “private” && (member.indexOf(“zhangsan”)>-1 || owner==“lisi”))

## where ##

let filter = {
        
      $or: [
              {
        
                  docKey: "public"
              },
              {
        
                  $where: function(){
        
                    return this.docKey == "private" && (this.member.indexOf("zhangsan") > -1 || this.owner == "lisi");
                  }
              }
          ]
    }
    db.getCollection('docs').find(filter);

直译：

> docKey == “public” || (docKey == “private” && (member.indexOf(“zhangsan”)>-1 || owner==“lisi”))

或者如下的写法

let filter = {
        
      $or: [
              {
        
                  docKey: "public"
              },
              {
        
                  $where: `this.docKey == "private" && (this.member.indexOf("zhangsan") > -1 || this.owner == "lisi")`
              }
          ]
    }
    db.getCollection('docs').find(filter);