com.mongodb

枚举 MapReduceCommand.OutputType

java.lang.Object

java.lang.Enum<MapReduceCommand.OutputType>

com.mongodb.MapReduceCommand.OutputType

所有已实现的接口:

java.io.Serializable, java.lang.Comparable<MapReduceCommand.OutputType>

封闭类:

MapReduceCommand

public static enum MapReduceCommand.OutputType
extends java.lang.Enum<MapReduceCommand.OutputType>

Represents the different options available for outputting the results of a map-reduce operation.

MongoDB documentation

Output options

枚举常量概要

枚举常量

枚举常量和说明
INLINE Return results inline, no result is written to the DB server
MERGE Merge the job output with the existing contents of outputTarget collection
REDUCE Reduce the job output with the existing contents of outputTarget collection
REPLACE Save the job output to a collection, replacing its previous content

方法概要

限定符和类型	方法和说明
static MapReduceCommand.OutputType	valueOf(java.lang.String name) 返回带有指定名称的该类型的枚举常量。
static MapReduceCommand.OutputType[]	values() 按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。

从类继承的方法 java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

从类继承的方法 java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

枚举常量详细资料

REPLACE

public static final MapReduceCommand.OutputType REPLACE

Save the job output to a collection, replacing its previous content

MERGE

public static final MapReduceCommand.OutputType MERGE

Merge the job output with the existing contents of outputTarget collection

REDUCE

public static final MapReduceCommand.OutputType REDUCE

Reduce the job output with the existing contents of outputTarget collection

INLINE

public static final MapReduceCommand.OutputType INLINE

Return results inline, no result is written to the DB server

方法详细资料

values

public static MapReduceCommand.OutputType[] values()

按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。该方法可用于迭代 常量, 如下所示:

for (MapReduceCommand.OutputType c : MapReduceCommand.OutputType.values())
    System.out.println(c);

返回:

按照声明该枚举类型的常量的顺序返回的包含这些常量的数组

valueOf

public static MapReduceCommand.OutputType valueOf(java.lang.String name)

返回带有指定名称的该类型的枚举常量。 字符串必须与用于声明该类型的枚举常量的 标识符完全匹配。(不允许有多余 的空格字符。)

参数:

name - 要返回的枚举常量的名称。

返回:

返回带有指定名称的枚举常量

抛出:

java.lang.IllegalArgumentException - 如果该枚举类型没有带有指定名称的常量

java.lang.NullPointerException - 如果参数为空值