枚举 TruthValue
- java.lang.Object
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- java.lang.Enum<TruthValue>
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- org.hibernate.query.criteria.internal.predicate.TruthValue
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- 所有已实现的接口:
Serializable,Comparable<TruthValue>
public enum TruthValue extends Enum<TruthValue>
Models what ANSI-SQL terms a truth value. Specifically, ANSI-SQL defines TRUE, FALSE and UNKNOWN as truth values. These truth values are used to explicitly check the result of a boolean expression (the syntax is like a > b IS TRUE. IS TRUE is the assumed default. JPA defines support for only IS TRUE and IS FALSE, not IS UNKNOWN (a > NULL is an example where the result would be UNKNOWN). All 3 are provided here for completeness.- 作者:
- Steve Ebersole
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枚举常量详细资料
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TRUE
public static final TruthValue TRUE
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FALSE
public static final TruthValue FALSE
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UNKNOWN
public static final TruthValue UNKNOWN
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方法详细资料
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values
public static TruthValue[] 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 (TruthValue c : TruthValue.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
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valueOf
public static TruthValue 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
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