如何在 MongoDB shell 中列出所有集合?
mongodbdatabasebig data analytics
要在 MongoDB shell 中列出所有集合，可以使用 `getCollectionNames()` 函数。
语法如下:
db.getCollectionNames();
您还可以使用另一个命令 `collections`。语法如下:
show collections;
要列出 MongoDB 中的所有集合，请使用以上两个函数。查询语句如下:
> db.getCollectionNames();
以下是输出 −
[ "ConvertStringToDateDemo", "IdUpdateDemo", "ProductsInformation", "addFieldDemo", "addNewFieldToEveryDocument", "arrayInnerElementsDemo", "arrayLengthGreaterThanOne", "arrayOfArraysDemo", "caseInsensitiveDemo", "changeDataType", "changeType", "charactersAllowedDemo", "charactersDemo", "checkFieldContainsStringDemo", "checkSequenceDemo", "combinationOfArrayDemo", "conditionalSumDemo", "convertStringToNumberDemo", "copyThisCollectionToSampleDatabaseDemo", "countDemo", "createSequenceDemo", "distinctCountValuesDemo", "distinctRecordDemo", "distinctWithMultipleKeysDemo", "employeeInformation", "filterArray", "findAllDuplicateKeyDocumentDemo", "findByMultipleArrayDemo", "findDuplicateByKeyDemo", "findDuplicateRecordsDemo", "findSpecificValue", "findValueInArrayWithMultipleCriteriaDemo", "getLastNRecordsDemo", "getParticularElementFromArrayDemo", "getPartuclarElement", "getSizeOfArray", "groupByDateDemo", "incrementValueInNestedArrayDemo", "insertIfNotExistsDemo", "nestedArrayDemo", "notLikeOpeartorDemo", "regExpOnIntegerDemo", "removeArrayDemo", "removeArrayElement", "removeArrayElements", "removeDuplicateDocumentDemo", "removeElementFromDoublyNestedArrayDemo", "removeFieldCompletlyDemo", "removeObject", "renameFieldDemo", "reverseRegexDemo", "searchArrayDemo", "selectSingleFieldDemo", "singleFieldDemo", "sortDemo", "sortInnerArrayDemo", "sourceCollection", "stringFieldLengthDemo", "test.js", "uniqueIndexOnArrayDemo", "unwindOperatorDemo", "updateExactField", "updateIdDemo", "updateObjects" ]
以下是显示 MongoDB 中所有集合的第二个查询。查询语句如下:−
> show collections;
以下是输出 −
ConvertStringToDateDemo IdUpdateDemo ProductsInformation addFieldDemo addNewFieldToEveryDocument arrayInnerElementsDemo arrayLengthGreaterThanOne arrayOfArraysDemo caseInsensitiveDemo changeDataType changeType charactersAllowedDemo charactersDemo checkFieldContainsStringDemo checkSequenceDemo combinationOfArrayDemo conditionalSumDemo convertStringToNumberDemo copyThisCollectionToSampleDatabaseDemo countDemo createSequenceDemo distinctCountValuesDemo distinctRecordDemo distinctWithMultipleKeysDemo employeeInformation filterArray findAllDuplicateKeyDocumentDemo findByMultipleArrayDemo findDuplicateByKeyDemo findDuplicateRecordsDemo findSpecificValue findValueInArrayWithMultipleCriteriaDemo getLastNRecordsDemo getParticularElementFromArrayDemo getPartuclarElement getSizeOfArray groupByDateDemo incrementValueInNestedArrayDemo insertIfNotExistsDemo nestedArrayDemo notLikeOpeartorDemo regExpOnIntegerDemo removeArrayDemo removeArrayElement removeArrayElements removeDuplicateDocumentDemo removeElementFromDoublyNestedArrayDemo removeFieldCompletlyDemo removeObject renameFieldDemo reverseRegexDemo searchArrayDemo selectSingleFieldDemo singleFieldDemo sortDemo sortInnerArrayDemo sourceCollection stringFieldLengthDemo test.js uniqueIndexOnArrayDemo unwindOperatorDemo updateExactField updateIdDemo updateObjects
