1.数据插入
db.集合名.insert()
操作
> use hk
switched to db hk
> show collections
> db.info.insert({"url":"www.lepu.cn"})
WriteResult({ "nInserted" : 1 })
> db.info.find()
{ "_id" : ObjectId("592bd4324c964b7784cca90f"), "url" : "www.lepu.cn" }
数组插入
db.info.insert([
{"url":"www.baidu.com"},
{"url":"www.9888.cn"},
{"url":"www.a.cn"}
]);
操作
> db.info.insert([
... {"url":"www.baidu.com"},
... {"url":"www.9888.cn"},
... {"url":"www.a.cn"}
... ]);
BulkWriteResult({
"writeErrors" : [ ],
"writeConcernErrors" : [ ],
"nInserted" : 3,
"nUpserted" : 0,
"nMatched" : 0,
"nModified" : 0,
"nRemoved" : 0,
"upserted" : [ ]
})
> db.info.find()
{ "_id" : ObjectId("592bd4324c964b7784cca90f"), "url" : "www.lepu.cn" }
{ "_id" : ObjectId("592bd4f84c964b7784cca910"), "url" : "www.baidu.com" }
{ "_id" : ObjectId("592bd4f84c964b7784cca911"), "url" : "www.9888.cn" }
{ "_id" : ObjectId("592bd4f84c964b7784cca912"), "url" : "www.a.cn" }
批量插入
for(var i=0;i<1000;i++){
db.info.insert({"url":"url->"+i});
}
操作
> for(var i=0;i<1000;i++){
... db.info.insert({"url":"url->"+i});
... }
WriteResult({ "nInserted" : 1 })
> db.info.find()
{ "_id" : ObjectId("592bd4324c964b7784cca90f"), "url" : "www.lepu.cn" }
{ "_id" : ObjectId("592bd4f84c964b7784cca910"), "url" : "www.baidu.com" }
{ "_id" : ObjectId("592bd4f84c964b7784cca911"), "url" : "www.9888.cn" }
{ "_id" : ObjectId("592bd4f84c964b7784cca912"), "url" : "www.a.cn" }
{ "_id" : ObjectId("592bd5bf4c964b7784cca913"), "url" : "url->0" }
{ "_id" : ObjectId("592bd5bf4c964b7784cca914"), "url" : "url->1" }
{ "_id" : ObjectId("592bd5bf4c964b7784cca915"), "url" : "url->2" }
.......................
{ "_id" : ObjectId("592bd5bf4c964b7784cca921"), "url" : "url->14" }
{ "_id" : ObjectId("592bd5bf4c964b7784cca922"), "url" : "url->15" }
Type "it" for more
在数据保存很多的情况下,只会显示20条,按it显示下一页
2.数据查询
关系运算,逻辑运算,数组运算,正则运算等
db.集合名称.find({查询条件},[{显示的字段}])
查询出url为"www.9888.cn"的数据
db.info.find({"url":"www.9888.cn"});
不需要显示的字段设为0,默认都是1
db.info.find({"url":"www.9888.cn"},{"_id":0,"url":1})
> db.info.find({"url":"www.9888.cn"},{"_id":0,"url":1})
{ "url" : "www.9888.cn" }
格式化显示
pretty()
var data={
"name":"hkui",
"age":26,
"hobby":"footbal,music",
"info":"it码农，哈哈哈哈哈哈哈"
};
db.info.insert(data);
> db.info.find({"name":"hkui"})
{ "_id" : ObjectId("592bda084c964b7784ccacfb"), "name" : "hkui", "age" : 26, "hobby" : "footbal,music", "info" : "it码农，哈哈哈哈哈哈哈" }
> db.info.find({"name":"hkui"}).pretty()
{
"_id" : ObjectId("592bda084c964b7784ccacfb"),
"name" : "hkui",
"age" : 26,
"hobby" : "footbal,music",
"info" : "it码农，哈哈哈哈哈哈哈"
}
关系查询
大于($gt)
小于($lt)
小于等于($lte)
大于等于($gte)
不等于($ne)
构造查询数据
db.stu.drop();
db.stu.insert({"name":"张三","sex":"男","age":18,"score":70,"address":"河南"});
db.stu.insert({"name":"李四","sex":"女","age":20,"score":60,"address":"山东"});
db.stu.insert({"name":"王五","sex":"男","age":17,"score":44,"address":"江苏"});
db.stu.insert({"name":"赵六","sex":"男","age":21,"score":80,"address":"山东"});
db.stu.insert({"name":"孙七","sex":"女","age":23,"score":50,"address":"湖北"});
db.stu.insert({"name":"tom","sex":"男","age":24,"score":20,"address":"海南"});
db.stu.insert({"name":"lucy","sex":"女","age":21,"score":62,"address":"浙江"});
db.stu.insert({"name":"jack","sex":"男","age":20,"score":90,"address":"美国"});
db.stu.insert({"name":"smith","sex":"男","age":19,"score":88,"address":"美国"});
db.stu.find({"name":"tom"}).pretty();
db.stu.find({"address":"山东"}).pretty();
age大于20的
db.stu.find({"age":{"$gt":20}}).pretty();
查询姓名不是tom的
db.stu.find({"name":{"$ne":"tom"}}).pretty();
逻辑运算
与($and) 或($or) 非($not,$nor)
查询年龄在18~21
db.stu.find({"age":{"$gte":18,"$lte":21}})
查询年龄小于20或者score>80的
db.stu.find({"$or":
[
{"age":{"$lt":20}},
{"score":{"$gt":80}}
]
}).pretty();
取反操作
db.stu.find({"$nor":
[
{"age":{"$lt":22}},
{"score":{"$gt":90}}
]
}).pretty();
取模
$mod
{$mod:[数字,余数]}
取出除数是20,,余数为1的
db.stu.find({"age":{"$mod":[20,1]}}).pretty();
范围查询
$in或者$nin
db.stu.find({
"address":{"$in":["河南","山东"]}
})
数组查询
针对数组内容,运算符有
$all,$size,$slice,$elemMath
构造数据
db.stus.drop();
db.stus.insert({"name":"hk1","sex":"男","age":18,"score":70,"address":"河南","course_id":[1,2,3,4,5]});
db.stus.insert({"name":"hk2","sex":"女","age":20,"score":60,"address":"山东","course_id":[1,2,3,4]});
db.stus.insert({"name":"hk3","sex":"男","age":17,"score":44,"address":"江苏","course_id":[1,2,3]});
db.stus.insert({"name":"hk4","sex":"男","age":21,"score":80,"address":"山东","course_id":[1,3]});
db.stus.insert({"name":"hk5","sex":"女","age":23,"score":50,"address":"湖北","course_id":[2,3,4]});
db.stus.insert({"name":"tom","sex":"男","age":24,"score":20,"address":"海南","course_id":[1]});
db.stus.insert({"name":"lucy","sex":"女","age":21,"score":62,"address":"浙江","course_id":[3,4]});
db.stus.insert({"name":"jack","sex":"男","age":20,"score":90,"address":"美国","course_id":[1,2,3,4]});
db.stus.insert({"name":"smith","sex":"男","age":19,"score":88,"address":"美国","course_id":[2,4]});
查询同事参加 2,4课程的
db.stus.find({"course_id":{"$all":[2,4]}}).pretty();
db.stus.find({"address":{"$all":["河南","山东"]}}).pretty();
//无结果
db.stus.find({"address":{"$all":["河南"]}}).pretty();
//查出了家是河南的
索引操作(从0 开始)
第二个为4的
db.stus.find({"course_id.1":4}).pretty();
//只参加2门课程的
db.stus.find({"course_id":{"$size":2}}).pretty();
//数组截取
//取前2门
db.stus.find({"age":18},{"course_id":{"$slice":2}}).pretty(); //1,2
//后2门
db.stus.find({"age":18},{"course_id":{"$slice":-2}}).pretty();//4,5
db.stus.find({"age":18},{"course_id":{"$slice":[1,2]}}).pretty();//2,3
db.stus.find({"age":18},{"course_id":{"$slice":[3,1]}}).pretty();//4 //闭合区间，长度
$elemMatch
数据
db.stus1.drop();
db.stus1.insert({"name":"hk1","sex":"男","age":18,"score":70,"address":"河南","course_id":[1,2,3,4,5],
"parents":[
{"name":"hk1_father","job":"程序员","age":50},
{"name":"hk1_mother","job":"工人","age":45}
]
});
db.stus1.insert({"name":"hk2","sex":"女","age":20,"score":60,"address":"山东","course_id":[1,2,3,4],
"parents":[
{"name":"hk2_father","job":"教师","age":52},
{"name":"hk2_mother","job":"程序员","age":45}
]
});
db.stus1.insert({"name":"hk3","sex":"男","age":17,"score":44,"address":"江苏","course_id":[1,2,3],
"parents":[
{"name":"hk3_father","job":"教授","age":45},
{"name":"hk3_mother","job":"销售","age":40}
]
});
db.stus1.insert({"name":"hk4","sex":"男","age":21,"score":80,"address":"山东","course_id":[1,3]});
查询出age大于18,父母里有是程序员的
db.stus1.find({
"$and":
[
{ "age":{"$gt":18}},
{ "parents":{ "$elemMatch":
{"job":"程序员"}
}
}
]
}).pretty();
查询出age大于18,父母里有是程序员的而且程序员年龄小于50
db.stus1.find({
"$and":
[
{ "age":{"$gt":18}},
{ "parents":{ "$elemMatch":
{"$and":
[{"job":"程序员"},{"age":{"$lt":50}}]
}
}
}
]
}).pretty();
判断某个字段是否存在 $exists
true表示存在,false表示不存在
判断没有父母信息存在的
db.stus.find({"parents":{"$exists":true}}).pretty();
db.stus.find({"parents":{"$exists":false}}).pretty();
条件过滤
$where
查询年龄大于20的
db.stu.find({"$where":"this.age>20"});
db.stu.find("this.age>20");
每一行进行判断
或者
db.stu.find(function(){
return this.age>20;
})
或者
db.stu.find({"$where":function(){
return this.age>20;
}});
复合条件判断
db.stu.find({"$and":[
{"$where":"this.age>20"},
{"$where":"this.age<22"},
]});
缺点把bson变成js代码语法结构,这种方式不方便使用数据库索引机制
时间： 2024-10-04 03:04:55