com.mongodb

枚举 ReadConcernLevel

java.lang.Object

java.lang.Enum<ReadConcernLevel>

com.mongodb.ReadConcernLevel

所有已实现的接口:

java.io.Serializable, java.lang.Comparable<ReadConcernLevel>

public enum ReadConcernLevel
extends java.lang.Enum<ReadConcernLevel>

The readConcern option allows clients to choose a level of isolation for their reads. The WiredTiger storage engine, introduces the readConcern option for replica sets and replica set shards. Allowing clients to choose a level of isolation for their reads.

从以下版本开始:

3.2

MongoDB documentation

Read Concern

Since server release

3.2

枚举常量概要

枚举常量

枚举常量和说明
LOCAL Return the node's most recent copy of data.
MAJORITY Return the node's most recent copy of the data confirmed as having been written to a majority of the nodes.

方法概要

限定符和类型	方法和说明
static ReadConcernLevel	fromString(java.lang.String readConcernLevel) Returns the ReadConcern from the string read concern level.
java.lang.String	getValue()
static ReadConcernLevel	valueOf(java.lang.String name) 返回带有指定名称的该类型的枚举常量。
static ReadConcernLevel[]	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

LOCAL

public static final ReadConcernLevel LOCAL

Return the node's most recent copy of data. Provides no guarantee that the data has been written to a majority of the nodes.

MAJORITY

public static final ReadConcernLevel MAJORITY

Return the node's most recent copy of the data confirmed as having been written to a majority of the nodes.

方法详细资料

values

public static ReadConcernLevel[] 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 (ReadConcernLevel c : ReadConcernLevel.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 ReadConcernLevel 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

getValue

public java.lang.String getValue()

返回:

the String representation of the read concern level that the MongoDB server understands or null for the default

fromString

public static ReadConcernLevel fromString(java.lang.String readConcernLevel)

Returns the ReadConcern from the string read concern level.

参数:

readConcernLevel - the read concern level string.

返回:

the read concern