由于超过最大字数，续一下
PRIMARY> db.test.update({ "skyImsi" : "aaaaaaaaaaaaaaaaaaaaaa"},{$pull:{"usrDiscountBCList":"joe"}}) --$pull使用
PRIMARY> db.test.findOne()
{
"_id" : 1,
"myfied" : [
[
{
"name" : "joe",
"scores" : 90
}
]
],
"skyImsi" : "aaaaaaaaaaaaaaaaaaaaaa",
"usrComboVer" : "bbbbbbbbbbbbbb",
"usrDiscountBCList" : [
{
"usrContentId" : "5",
"sourceType" : 1,
"sourceId" : 1,
"contentId" : "1",
"billingType" : 1,
"billingTypeValue" : 0,
"billingCol0" : 0,
"effTime" : "20120124000000",
"expTime" : "20120223235959"
},
{
"usrContentId" : "6",
"sourceType" : 1,
"sourceId" : 1,
"contentId" : "1",
"billingType" : 1,
"billingTypeValue" : 0,
"billingCol0" : 0,
"effTime" : "20120224000000",
"expTime" : "20120325235959"
},
{
"name" : "joe",
"scores" : 90
}
]
}
db.test.update({ "skyImsi" : "aaaaaaaaaaaaaaaaaaaaaa"},{$pullAll:{"usrDiscountBCList":[{name:"joe",scores:90}]}}) --$pullAll使用
db.test.findOne()
{
"_id" : 1,
"myfied" : [
[
{
"name" : "joe",
"scores" : 90
}
]
],
"skyImsi" : "aaaaaaaaaaaaaaaaaaaaaa",
"usrComboVer" : "bbbbbbbbbbbbbb",
"usrDiscountBCList" : [
{
"usrContentId" : "5",
"sourceType" : 1,
"sourceId" : 1,
"contentId" : "1",
"billingType" : 1,
"billingTypeValue" : 0,
"billingCol0" : 0,
"effTime" : "20120124000000",
"expTime" : "20120223235959"
},
{
"usrContentId" : "6",
"sourceType" : 1,
"sourceId" : 1,
"contentId" : "1",
"billingType" : 1,
"billingTypeValue" : 0,
"billingCol0" : 0,
"effTime" : "20120224000000",
"expTime" : "20120325235959"
}
]
}
PRIMARY> db.test.update({ "skyImsi" : "aaaaaaaaaaaaaaaaaaaaaa"},{$rename:{"usrDiscountBCList":"mycolumn"}}) --$rename使用
PRIMARY> db.test.findOne()
{
"_id" : 1,
"mycolumn" : [
{
"usrContentId" : "5",
"sourceType" : 1,
"sourceId" : 1,
"contentId" : "1",
"billingType" : 1,
"billingTypeValue" : 0,
"billingCol0" : 0,
"effTime" : "20120124000000",
"expTime" : "20120223235959"
},
{
"usrContentId" : "6",
"sourceType" : 1,
"sourceId" : 1,
"contentId" : "1",
"billingType" : 1,
"billingTypeValue" : 0,
"billingCol0" : 0,
"effTime" : "20120224000000",
"expTime" : "20120325235959"
}
],
"myfied" : [
[
{
"name" : "joe",
"scores" : 90
}
]
],
"skyImsi" : "aaaaaaaaaaaaaaaaaaaaaa",
"usrComboVer" : "bbbbbbbbbbbbbb"
}
PRIMARY> db.test.update({ "mycolumn.sourceId":1},{$unset:{"mycolumn.$.sourceType":1}})
PRIMARY> db.test.findOne()
{
"_id" : 1,
"mycolumn" : [
{
"billingCol0" : 0,
"billingType" : 1,
"billingTypeValue" : 0,
"contentId" : "1",
"effTime" : "20120124000000",
"expTime" : "20120223235959",
"sourceId" : 1,
"usrContentId" : "5"
},
{
"usrContentId" : "6",
"sourceType" : 1,
"sourceId" : 1,
"contentId" : "1",
"billingType" : 1,
"billingTypeValue" : 0,
"billingCol0" : 0,
"effTime" : "20120224000000",
"expTime" : "20120325235959"
}
],
"myfied" : [
[
{
"name" : "joe",
"scores" : 90
}
]
],
"skyImsi" : "aaaaaaaaaaaaaaaaaaaaaa",
"usrComboVer" : "bbbbbbbbbbbbbb"
}
PRIMARY> db.test.update({ "mycolumn.sourceId":1},{$unset:{"mycolumn.1.sourceType":1}})
PRIMARY> db.test.findOne()
{
"_id" : 1,
"mycolumn" : [
{
"billingCol0" : 0,
"billingType" : 1,
"billingTypeValue" : 0,
"contentId" : "1",
"effTime" : "20120124000000",
"expTime" : "20120223235959",
"sourceId" : 1,
"usrContentId" : "5"
},
{
"billingCol0" : 0,
"billingType" : 1,
"billingTypeValue" : 0,
"contentId" : "1",
"effTime" : "20120224000000",
"expTime" : "20120325235959",
"sourceId" : 1,
"usrContentId" : "6"
}
],
"myfied" : [
[
{
"name" : "joe",
"scores" : 90
}
]
],
"skyImsi" : "aaaaaaaaaaaaaaaaaaaaaa",
"usrComboVer" : "bbbbbbbbbbbbbb"
}
PRIMARY> db.t.insert({x: [1,2,3,4,3,2,3,4]})
PRIMARY> db.t.find()
{ "_id" : ObjectId("50c19a7be2e3192b739d44eb"), "x" : [ 1, 2, 3, 4, 3, 2, 3, 4 ] }
PRIMARY> db.t.update({x:3}, {$unset:{"x.$":1}})
PRIMARY> db.t.find()
{ "_id" : ObjectId("50c19a7be2e3192b739d44eb"), "x" : [ 1, 2, null, 4, 3, 2, 3, 4 ] }
以上是$和$unset一起使用的结果，有些地方还是有区别的
