下面说一下,mongodb select的常用操作
测试数据
- { "_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
- > 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
- $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
- > 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
- $collection->findOne();
- $collection->findOne(array("auther"=>"李白"));
3,find snapshot 游标
- > 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
- /**
- * 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
- > 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
- $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
- > 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
- $result = $collection->find()->limit(1)->skip(1);//跳过 1 条记录,取出 1条
6,排序
- > 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
- $result = $collection->find()->sort(array(‘code‘=>1,‘money‘=>-1));
7,模糊查询
- > db.books.find({"title":/城/}); //like ‘%str%‘ 糊查询集合中的数据
- { "_id" : 2, "title" : "围城", "auther" : "钱钟书", "typeColumn" : "test", "money" : 56, "code" : 20 }
- { "_id" : 3, "title" : "朝发白帝城", "auther" : "李白", "typeColumn" : "test", "money" : 30, "code" : 30 }
- > db.books.find({"auther":/^李/}); //like ‘str%‘ 糊查询集合中的数据
- { "_id" : 3, "title" : "朝发白帝城", "auther" : "李白", "typeColumn" : "test", "money" : 30, "code" : 30 }
- { "_id" : 4, "title" : "将近酒", "auther" : "李白", "money" : 90, "code" : 40 }
- > db.books.find({"auther":/书$/}); //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
- $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
- > 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
- $param = array("money" => array(‘$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
- > 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
- $param = array(‘$or‘=>array(array("money"=>20),array("money"=>80)));
- $result = $collection->find($param);
- foreach ($result as $id=>$value) {
- var_dump($value);
- }
10,distinct
- > 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
- $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。