perl操作MongoDB

cpan安装MongoDB:

perl -MCPAN -e 'install MongoDB'

 

example:

 

use MongoDB;my $connection = MongoDB::Connection->new( host => 'localhost', port => 27017 );my $database   = $connection->dbname;            my $collection = $database->tablename;my $data       = $collection->find({'key' => 'value'});            //select * from table where key = 'value' or $collection->find_one() limit 1 while (my $object = $data->next()) {    foreach my $key (keys %{$object}) {        say "$key => ${$object}{$key}";    }} $collection->update({'key' => "value"}, {'$set' => { 'mykey' => 'myvalue'}});              //update table set mykey = 'myvalue' where key = 'value'

 

 

 

一些sql语句的例子:

 

<CREATE TABLE USERS (a Number, b Number)>
Implicit, can be done explicitly.

<INSERT INTO USERS VALUES(1,1)>

    $db->users->insert({a => 1, b => 1});

<SELECT a,b FROM users>

    $db->users->find({}, {a => 1, b => 1});

<SELECT * FROM users>

    $db->users->find;

<SELECT * FROM users WHERE age=33>

    $db->users->find({age => 33})

<SELECT a,b FROM users WHERE age=33>

    $db->users->find({age => 33}, {a => 1, b => 1});

<SELECT * FROM users WHERE age=33 ORDER BY name>

    $db->users->find({age => 33})->sort({name => 1});

<<SELECT * FROM users WHERE age>33>>

    $db->users->find({age => {'$gt' => 33}})

<<SELECT * FROM users WHERE age<33>>

    $db->users->find({age => {'$lt' => 33}})

<SELECT * FROM users WHERE name LIKE "%Joe%">

    $db->users->find({name => qr/Joe/});

<SELECT * FROM users WHERE name LIKE "Joe%">

    $db->users->find({name => qr/^Joe/});

<<SELECT * FROM users WHERE age>33 AND age<=40>>

    $db->users->find({age => {'$gt' => 33, '$lte' => 40}});

<SELECT * FROM users ORDER BY name DESC>

    $db->users->find->sort({name => -1});

<CREATE INDEX myindexname ON users(name)>

    $db->users->ensure_index({name => 1});

<CREATE INDEX myindexname ON users(name,ts DESC)>

    $db->users->ensure_index(Tie::IxHash->new(name => 1, ts => -1));

<SELECT * FROM users WHERE a=1 and b='q'>

    $db->users->find({a => 1, b => "q"});

<SELECT * FROM users LIMIT 10 SKIP 20>

    $db->users->find->limit(10)->skip(20);

<SELECT * FROM users WHERE a=1 or b=2>

    $db->users->find({'$or' => [{a => 1}, {b => 2}]});

<SELECT * FROM users LIMIT 1>

    $db->users->find->limit(1);

<EXPLAIN SELECT * FROM users WHERE z=3>

    $db->users->find({z => 3})->explain;

<SELECT DISTINCT last_name FROM users>

    $db->run_command({distinct => "users", key => "last_name"});

<SELECT COUNT(*y) FROM users>

    $db->users->count;

<<SELECT COUNT(*y) FROM users where age > 30>>

    $db->users->find({"age" => {'$gt' => 30}})->count;

<SELECT COUNT(age) from users>

    $db->users->find({age => {'$exists' => 1}})->count;

<UPDATE users SET a=1 WHERE b='q'>

    $db->users->update({b => "q"}, {'$set' => {a => 1}});

<UPDATE users SET a=a+2 WHERE b='q'>

    $db->users->update({b => "q"}, {'$inc' => {a => 2}});

<DELETE FROM users WHERE z="abc">

    $db->users->remove({z => "abc"});