org.apache.shardingsphere.sql.parser.binder.segment.select.projection

枚举 DerivedColumn

java.lang.Object

java.lang.Enum<DerivedColumn>

org.apache.shardingsphere.sql.parser.binder.segment.select.projection.DerivedColumn

所有已实现的接口:

Serializable, Comparable<DerivedColumn>

public enum DerivedColumn
extends Enum<DerivedColumn>

Derived column alias.

枚举常量概要

枚举常量

枚举常量和说明
AGGREGATION_DISTINCT_DERIVED
AVG_COUNT_ALIAS
AVG_SUM_ALIAS
GROUP_BY_ALIAS
ORDER_BY_ALIAS

方法概要

限定符和类型	方法和说明
String	getDerivedColumnAlias(int derivedColumnCount) Get alias of derived column.
static boolean	isDerivedColumn(String columnName) Judge is derived column or not.
static boolean	isDerivedColumnName(String columnName) Judge is derived column name or not.
static DerivedColumn	valueOf(String name) 返回带有指定名称的该类型的枚举常量。
static DerivedColumn[]	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

AVG_COUNT_ALIAS

public static final DerivedColumn AVG_COUNT_ALIAS

AVG_SUM_ALIAS

public static final DerivedColumn AVG_SUM_ALIAS

ORDER_BY_ALIAS

public static final DerivedColumn ORDER_BY_ALIAS

GROUP_BY_ALIAS

public static final DerivedColumn GROUP_BY_ALIAS

AGGREGATION_DISTINCT_DERIVED

public static final DerivedColumn AGGREGATION_DISTINCT_DERIVED

方法详细资料

values

public static DerivedColumn[] 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 (DerivedColumn c : DerivedColumn.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 DerivedColumn valueOf(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:

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

NullPointerException - 如果参数为空值

getDerivedColumnAlias

public String getDerivedColumnAlias(int derivedColumnCount)

Get alias of derived column.

参数:

derivedColumnCount - derived column count

返回:

alias of derived column

isDerivedColumnName

public static boolean isDerivedColumnName(String columnName)

Judge is derived column name or not.

参数:

columnName - column name to be judged

返回:

is derived column name or not

isDerivedColumn

public static boolean isDerivedColumn(String columnName)

Judge is derived column or not.

参数:

columnName - column name to be judged

返回:

is derived column or not