前面说到了mongodb安装，配置，集群，以及php的插入与更新等，请参考：mongodb。
下面说一下，mongodb select的常用操作
测试数据：
复制代码 代码如下:
{ "_id" : 1, "title" : "红楼梦", "auther" : "曹雪芹", "typeColumn" : "test", "money" : 80, "code" : 10 }
{ "_id" : 2, "title" : "围城", "auther" : "钱钟书", "typeColumn" : "test", "money" : 56, "code" : 20 }
{ "_id" : 3, "title" : "朝发白帝城", "auther" : "李白", "typeColumn" : "test", "money" : 30, "code" : 30 }
{ "_id" : 4, "title" : "将近酒", "auther" : "李白", "money" : 90, "code" : 40 }
1、取表条数
复制代码 代码如下:
> db.books.count();
4
> db.books.find().count();
4
> db.books.count({auther: "李白" });
2
> db.books.find({money:{$gt:40,$lte:60}}).count();
1
> db.books.count({money:{$gt:40,$lte:60}});
1
php代码如下，按顺序对应的：
复制代码 代码如下:
$collection->count(); //结果：4
$collection->find()->count(); //结果：4
$collection->count(array("auther"=>"李白")); //结果：2
$collection->find(array("money"=>array('$gt'=>40,'$lte'=>60)))->count(); //结果：1
$collection->count(array("money"=>array('$gt'=>40,'$lte'=>60))); //结果：1
提示：$gt为大于、$gte为大于等于、$lt为小于、$lte为小于等于、$ne为不等于、$exists不存在、$in指定范围、$nin指定不在某范围
2、取单条数据
复制代码 代码如下:
> db.books.findOne();
{
"_id" : 1,
"title" : "红楼梦",
"auther" : "曹雪芹",
"typeColumn" : "test",
"money" : 80,
"code" : 10
}
> db.books.findOne({auther: "李白" });
{
"_id" : 3,
"title" : "朝发白帝城",
"auther" : "李白",
"typeColumn" : "test",
"money" : 30,
"code" : 30
}
php代码如下，按顺序对应的
复制代码 代码如下:
$collection->findOne();
$collection->findOne(array("auther"=>"李白"));
3、find snapshot 游标
复制代码 代码如下:
> db.books.find( { $query: {auther: "李白" }, $snapshot: true } );
{ "_id" : 3, "title" : "朝发白帝城", "auther" : "李白", "typeColumn" : "test", "money" : 30, "code" : 30 }
{ "_id" : 4, "title" : "将近酒", "auther" : "李白", "money" : 90, "code" : 40 }
php代码如下：
复制代码 代码如下:
/**
* 注意:
* 在我们做了find()操作，获得 $result 游标之后，这个游标还是动态的.
* 换句话说,在我find()之后,到我的游标循环完成这段时间,如果再有符合条件的记录被插入到collection,那么这些记录也会被$result 获得.
*/
$result = $collection->find(array("auther"=>"李白"))->snapshot();
foreach ($result as $id => $value) {
var_dump($value);
}
4、自定义列显示
复制代码 代码如下:
> db.books.find({},{"money":0,"auther":0}); //money和auther不显示
{ "_id" : 1, "title" : "红楼梦", "typeColumn" : "test", "code" : 10 }
{ "_id" : 2, "title" : "围城", "typeColumn" : "test", "code" : 20 }
{ "_id" : 3, "title" : "朝发白帝城", "typeColumn" : "test", "code" : 30 }
{ "_id" : 4, "title" : "将近酒", "code" : 40 }
> db.books.find({},{"title":1}); //只显示title列
{ "_id" : 1, "title" : "红楼梦" }
{ "_id" : 2, "title" : "围城" }
{ "_id" : 3, "title" : "朝发白帝城" }
{ "_id" : 4, "title" : "将近酒" }
/**
*money在60到100之间，typecolumn和money二列必须存在
*/
> db.books.find({money:{$gt:60,$lte:100}},{"typeColumn":1,"money":1});
{ "_id" : 1, "typeColumn" : "test", "money" : 80 }
{ "_id" : 4, "money" : 90 }
php代码如下，按顺序对应的：
复制代码 代码如下:
$result = $collection->find()->fields(array("auther"=>false,"money"=>false)); //不显示auther和money列
$result = $collection->find()->fields(array("title"=>true)); //只显示title列
/**
*money在60到100之间，typecolumn和money二列必须存在
*/
$where=array('typeColumn'=>array('$exists'=>true),'money'=>array('$exists'=>true,'$gte'=>60,'$lte'=>100));
$result = $collection->find($where);
5、分页
复制代码 代码如下:
> db.books.find().skip(1).limit(1); //跳过第条，取一条
{ "_id" : 2, "title" : "围城", "auther" : "钱钟书", "typeColumn" : "test", "money" : 56, "code" : 20 }
这根mysql，limit,offset有点类似，php代码如下：
复制代码 代码如下:
$result = $collection->find()->limit(1)->skip(1);//跳过 1 条记录，取出 1条
6、排序
复制代码 代码如下:
> db.books.find().sort({money:1,code:-1}); //1表示降序 -1表示升序,参数的先后影响排序顺序
{ "_id" : 3, "title" : "朝发白帝城", "auther" : "李白", "typeColumn" : "test", "money" : 30, "code" : 30 }
{ "_id" : 2, "title" : "围城", "auther" : "钱钟书", "typeColumn" : "test", "money" : 56, "code" : 20 }
{ "_id" : 1, "title" : "红楼梦", "auther" : "曹雪芹", "typeColumn" : "test", "money" : 80, "code" : 10 }
{ "_id" : 4, "title" : "将近酒", "auther" : "李白", "money" : 90, "code" : 40 }
php代码如下：
复制代码 代码如下:
$result = $collection->find()->sort(array('code'=>1,'money'=>-1));
7、模糊查询
复制代码 代码如下:
> db.books.find({"title":/城/}); //like '%str%' 糊查询集合中的数据
{ "_id" : 2, "title" : "围城", "auther" : "钱钟书", "typeColumn" : "test", "money" : 56, "code" : 20 }
{ "_id" : 3, "title" : "朝发白帝城", "auther" : "李白", "typeColumn" : "test", "money" : 30, "code" : 30 }
> db.books.find({"auther":/^李/}); //like 'str%' 糊查询集合中的数据
{ "_id" : 3, "title" : "朝发白帝城", "auther" : "李白", "typeColumn" : "test", "money" : 30, "code" : 30 }
{ "_id" : 4, "title" : "将近酒", "auther" : "李白", "money" : 90, "code" : 40 }
> db.books.find({"auther":/书$/}); //like '%str' 糊查询集合中的数据
{ "_id" : 2, "title" : "围城", "auther" : "钱钟书", "typeColumn" : "test", "money" : 56, "code" : 20 }
> db.books.find( { "title": { $regex: '城', $options: 'i' } } ); //like '%str%' 糊查询集合中的数据
{ "_id" : 2, "title" : "围城", "auther" : "钱钟书", "typeColumn" : "test", "money" : 56, "code" : 20 }
{ "_id" : 3, "title" : "朝发白帝城", "auther" : "李白", "typeColumn" : "test", "money" : 30, "code" : 30 }
php代码如下，按顺序对应的：
复制代码 代码如下:
$param = array("title" => new MongoRegex('/城/'));
$result = $collection->find($param);
$param = array("auther" => new MongoRegex('/^李/'));
$result = $collection->find($param);
$param = array("auther" => new MongoRegex('/书$/'));
$result = $collection->find($param);
8、$in和$nin
复制代码 代码如下:
> db.books.find( { money: { $in: [ 20,30,90] } } ); //查找money等于20，30，90的数据
{ "_id" : 3, "title" : "朝发白帝城", "auther" : "李白", "typeColumn" : "test", "money" : 30, "code" : 30 }
{ "_id" : 4, "title" : "将近酒", "auther" : "李白", "money" : 90, "code" : 40 }
> db.books.find( { auther: { $in: [ /^李/,/^钱/ ] } } ); //查找以李，钱开头的数据
{ "_id" : 2, "title" : "围城", "auther" : "钱钟书", "typeColumn" : "test", "money" : 56, "code" : 20 }
{ "_id" : 3, "title" : "朝发白帝城", "auther" : "李白", "typeColumn" : "test", "money" : 30, "code" : 30 }
{ "_id" : 4, "title" : "将近酒", "auther" : "李白", "money" : 90, "code" : 40 }
php代码如下，按顺序对应的：
复制代码 代码如下:
$param = array("money" => array('$in'=>array(20,30,90)));
$result = $collection->find($param);
foreach ($result as $id=>$value) {
var_dump($value);
}
$param = array("auther" => array('$in'=>array(new MongoRegex('/^李/'),new MongoRegex('/^钱/'))));
$result = $collection->find($param);
foreach ($result as $id=>$value) {
var_dump($value);
}
9、$or
复制代码 代码如下:
> db.books.find( { $or: [ { money: 20 }, { money: 80 } ] } ); //查找money等于20，80的数据
{ "_id" : 1, "title" : "红楼梦", "auther" : "曹雪芹", "typeColumn" : "test", "money" : 80, "code" : 10 }
php代码如下：
复制代码 代码如下:
$param = array('$or'=>array(array("money"=>20),array("money"=>80)));
$result = $collection->find($param);
foreach ($result as $id=>$value) {
var_dump($value);
}
10、distinct
复制代码 代码如下:
> db.books.distinct( 'auther' );
[ "曹雪芹", "钱钟书", "李白" ]
> db.books.distinct( 'auther' , { money: { $gt: 60 } });
[ "曹雪芹", "李白" ]
php代码如下：
复制代码 代码如下:
$result = $curDB->command(array("distinct" => "books", "key" => "auther"));
foreach ($result as $id=>$value) {
var_dump($value);
}
$where = array("money" => array('$gte' => 60));
$result = $curDB->command(array("distinct" => "books", "key" => "auther", "query" => $where));
foreach ($result as $id=>$value) {
var_dump($value);
}
先写到这儿，上面只是SELECT的一些常用操作，接下来，还会写一点。
![[PHP8] 我参加了PHP8工程师认证初学者考试beta考试](https://file.lexue001.com/www/202303/08/115219106.gif?x-oss-process=image/auto-orient,1/resize,m_fill,w_240,h_180/quality,q_90)
![[PHP8] 我参加了PHP8工程师认证初学者考试beta考试](https://file.lexue001.com/www/202303/08/115219106.gif?x-oss-process=image/auto-orient,1/resize,m_fill,w_125,h_98/quality,q_90)
