9)创建索引 可以使用集合的ensureIndex(keypattern[,options])方法,示例如下所示: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 > use pagedb switched to db pagedb > db.page.ensureIndex({'title':1, 'url':-1}) { "createdCollectionAutom
Create INDEX idxname ON users(name) db.users.ensureIndex({name:1}) 创建索引 Create INDEX idxname ON users(name,ts DESC) db.users.ensureIndex({name:1,ts:-1}) 创建索引 Insert into users values(1, 1) db.users.insert({a:1, b:1}) 插入记录 Select a, b from users db.users.find({}...
demo.ensureIndex(keypattern[,options]) - DEPRECATED, use createIndex() instead db.demo.explain().help() - show explain help db.demo.reIndex() db.demo.find([query],[fields]) - query is an optional query filter. fields is optional set of fields to return. e.g. db.demo.find( {x:77...
{ "_id" : ObjectId("5ad4a2b7f96e28a6002a2a2c"), "int" : 4 } > db.myColle.ensureIndex({"open:1,close:1"},{background:true}) 2018-04-16T21:39:08.923+0800 E QUERY [thread1] SyntaxError: missing : after property id @(shell):1:40 > db.myColle.ensureIndex({open:1,close:1...
function usage(){ echo "$SCRIPTFILE - 分库分表后将数据导数据到mongodb" echo "SYNOPSIS" echo "OPTIONS" echo " -h 打印帮助信息,并退出"; echo " -f 需要切分的数据文件"; echo " -g 是否清理历史数据,默认不清理 1:清理昨日数据 2:清理以前所有数据"; ...
db.mycoll.dropIndex( "indexName" ) or db.mycoll.dropIndex( { "indexKey" : 1 } ) db.mycoll.dropIndexes() db.mycoll.ensureIndex(keypattern[,options]) db.mycoll.explain().help() - show explain help db.mycoll.reIndex() db.mycoll.find([query],[fields]) - query is an optional ...
//建立唯一值的索引db.hw.ensureIndex({name:1},{'unique':true}) //1升序 -1降序db.hw.find({name:'he'}).explain('executionStats') //获取时间//查看集合中所有索引db.hw.getIndexes()//删除索引db.hw.dropIndex('name')//重建索引db.hw.reIndex() ...
命令: db.users.ensureIndex({userNo:1}) > db.users.ensureIndex({userNo:1}) { "createdCollectionAutomatically" : false, "numIndexesBefore" : 1, "numIndexesAfter" : 2, "ok" : 1 } 4. 查询索引 命令: db.users.getIndexes() > db.users.getIndexes() [ { "v" : 2, "key" : { "_id...
Describe the bug The new function "Rebuild indexes" is still buggy. The logic in MongoSchemaGenerator.ts:105 returns incorrect Array[Index]. https://github.com/mikro-orm/mikro-orm/blob/master/packages/mongodb/src/MongoSchemaGenerator.ts#...
> cursor.forEach(function(x) { ... print(x.name); ... }); adam matt zak 调用find时,shell并不立即查询数据库,而是等待真正开始要求获得结果时才发送查询,这样在执行之前可以给查询附加额外的选项。几乎游标对象的每个方法都返回游标本身,这样就可以按任意顺序组成方法链。例如,下面几种表达是等价的: ...