mysql 与 mongo之间是怎么替换的？
官方有一个表格：
| SQL Statement | Mongo Query Language Statement |
|---|---|
| CREATE TABLE USERS (a Number, b Number) | Implicit or use MongoDB::createCollection(). |
| INSERT INTO USERS VALUES(1,1) | $db->users->insert(array("a" => 1, "b" => 1)); |
| SELECT a,b FROM users | $db->users->find(array(), array("a" => 1, "b" => 1)); |
| SELECT * FROM users WHERE age=33 | $db->users->find(array("age" => 33)); |
| SELECT a,b FROM users WHERE age=33 | $db->users->find(array("age" => 33), array("a" => 1, "b" => 1)); |
| SELECT a,b FROM users WHERE age=33 ORDER BY name | $db->users->find(array("age" => 33), array("a" => 1, "b" => 1))->sort(array("name" => 1)); |
| SELECT * FROM users WHERE age>33 | $db->users->find(array("age" => array('$gt' => 33))); |
| SELECT * FROM users WHERE age<33 | $db->users->find(array("age" => array('$lt' => 33))); |
| SELECT * FROM users WHERE name LIKE "%Joe%" | $db->users->find(array("name" => new MongoRegex("/Joe/"))); |
| SELECT * FROM users WHERE name LIKE "Joe%" | $db->users->find(array("name" => new MongoRegex("/^Joe/"))); |
| SELECT * FROM users WHERE age>33 AND age<=40 | $db->users->find(array("age" => array('$gt' => 33, '$lte' => 40))); |
| SELECT * FROM users ORDER BY name DESC | $db->users->find()->sort(array("name" => -1)); |
| CREATE INDEX myindexname ON users(name) | $db->users->ensureIndex(array("name" => 1)); |
| CREATE INDEX myindexname ON users(name,ts DESC) | $db->users->ensureIndex(array("name" => 1, "ts" => -1)); |
| SELECT * FROM users WHERE a=1 and b='q' | $db->users->find(array("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 | $db->users->find(array('$or' => array(array("a" => 1), array("b" => 2)))); |
| SELECT * FROM users LIMIT 1 | $db->users->find()->limit(1); |
| EXPLAIN SELECT * FROM users WHERE z=3 | $db->users->find(array("z" => 3))->explain() |
| SELECT DISTINCT last_name FROM users | $db->command(array("distinct" => "users", "key" => "last_name")); |
| SELECT COUNT(*y) FROM users | $db->users->count(); |
| SELECT COUNT(*y) FROM users where AGE > 30 | $db->users->find(array("age" => array('$gt' => 30)))->count(); |
| SELECT COUNT(AGE) from users | $db->users->find(array("age" => array('$exists' => true)))->count(); |
| UPDATE users SET a=1 WHERE b='q' | $db->users->update(array("b" => "q"), array('$set' => array("a" => 1))); |
| UPDATE users SET a=a+2 WHERE b='q' | $db->users->update(array("b" => "q"), array('$inc' => array("a" => 2))); |
| DELETE FROM users WHERE z="abc" | $db->users->remove(array("z" => "abc")); |
不过，硬要说的话，这个还不全，http://www.mongodb.org/display/DOCS/SQL+to+Mongo+Mapping+Chart，这里有更全的。
在上面的页面还能够讲这个mapping chart导出成pdf。
比如，这个：docs-8716963-090117-10.pdf
