php中的mongodb select常用操作代码示例,mongodbselect
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($value);
}
先写到这儿,上面只是SELECT的一些常用操作,接下来,还会写一点。
据我所知,目前mongoDB没有“或”这个东西
但我刚才在网上查了下
发现了下面的信息,你参考下吧
在mongodb中有$or 操作符的,官网中给出的例子如下:
Simple:
db.foo.find( { $or : [ { a : 1 } , { b : 2 } ] } )
With another field
db.foo.find( { name : "bob" , $or : [ { a : 1 } , { b : 2 } ] } )
The $or operator retrieves matches for each or clause individually and eliminates duplicates when returning results. A number of $or optimizations are planned for 1.8. See this thread for details.
$or cannot be nested.
复合查询?例如。详细的意思不用我解说了吧
$sql="select * from p_newsbase as a, p_newscontent as b where a.id=b.nid and a.id='$_GET[id]'"

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。


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