SQL to SequoiaDB shell to Python

SequoiaDB 的查询用 dict（bson）对象表示，下表以例子的形式显示了 SQL 语句，SequoiaDB shell 语句和 SequoiaDB Python 驱动程序语法之间的对照。

SQLSequoiaDB shellPython Driver
insert into employee(a,b) values(1,-1)db.sample.employee.insert({a:1,b:-1})cl = db.get_collection(“sample.employee”)
obj = { “a”:1, “b”:-1 }
cl.insert( obj )
select a,b from employeedb.sample.employee.find(null,{a:””,b:””})cl = db.get_collection(“sample.employee”)
selected = { “a”:””,”b”:”” }
cr = cl.query(selector = selected )
select from employeedb.sample.employee.find()cl = db.get_collection(“sample.employee”)
cr = cl.query ()
select from employee where age=20db.sample.employee.find({age:20})cl = db.get_collection(“sample.employee”)
cond ={“age”:20}
cr = cl.query ( condition = cond )
select from employee where age=20 order by namedb.sample.employee.find({age:20}).sort({name:1})cl = db.get_collection(“sample.employee”)
cond ={“age”:20}
orderBy = {“name”:1}
cr = cl.query (condition=cond , order_by=orderBy)
select from employee where age > 20 and age < 30db.sample.employee.find({age:{$gt:20,$lt:30}})cl = db.get_collection(“sample.employee”)
cond = {“age”:{“$gt”:20,”$lt”:30}}
cr = cl.query (condition = cond )
create index testIndex on employee(name)db.sample.employee.createIndex(“testIndex”,{name:1},false)cl = db.get_collection(“sample.employee”)
obj = { “name”:1 }
cl.create_index ( obj, “testIndex”, False, False )
select from employee limit 20 offset 10db.sample.employee.find().limit(20).skip(10)cl = db.get_collection(“sample.employee”)
cr = cl.query (num_to_skip=10L, num_to_return=20L )
select count() from employee where age > 20db.sample.employee.find({age:{$gt:20}}).count()cl = db.get_collection(“sample.employee”)
count = 0L
condition = { “age”:{“$gt”:20}}
count = cl.get_count (condition )
update employee set a=2 where b=-1db.sample.employee.update({$set:{a:2}},{b:-1})cl = db.get_collection(“sample.employee”)
condition = { “b”:1 }
rule = { “$set”:{“a”:2} }
cl.update ( rule, condition=condition )
delete from employee where a=1db.sample.employee.remove({a:1})cl = db.get_collection(“sample.employee”)
condition = {“a”:1}
cl.delete ( condition=condition )