gudusoft.gsqlparser.sqlenv

Enum IdentifierRules.CaseFold

Object

Enum<IdentifierRules.CaseFold>

gudusoft.gsqlparser.sqlenv.IdentifierRules.CaseFold

All Implemented Interfaces:

Serializable, Comparable<IdentifierRules.CaseFold>

Enclosing class:

IdentifierRules

public static enum IdentifierRules.CaseFold
extends Enum<IdentifierRules.CaseFold>

大小写折叠规则（Case Folding）

决定如何规范化标识符的大小写

Enum Constant Summary

Enum Constants

Enum Constant and Description
LOWER 转小写
LOWER_ASCII Only A..Z are lowered; every other character is kept.
LOWER_SIMPLE Simple lowercase mapping, one code point to one, no Final_Sigma context (İ becomes i).
NONE 不转换（保留原样）
UPPER 转大写
UPPER_SIMPLE Simple uppercase mapping, one code point to one (ß is kept): each code point becomes its UnicodeData Simple_Uppercase_Mapping.

Method Summary

Modifier and Type	Method and Description
static IdentifierRules.CaseFold	valueOf(String name) Returns the enum constant of this type with the specified name.
static IdentifierRules.CaseFold[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class Enum

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

Methods inherited from class Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

NONE

public static final IdentifierRules.CaseFold NONE

不转换（保留原样）

例如：Couchbase unquoted, 所有 quoted identifiers

UPPER

public static final IdentifierRules.CaseFold UPPER

转大写

例如：Oracle unquoted, DB2 unquoted, Snowflake unquoted

LOWER

public static final IdentifierRules.CaseFold LOWER

转小写

例如：PostgreSQL unquoted, Redshift unquoted, Greenplum unquoted

UPPER_SIMPLE

public static final IdentifierRules.CaseFold UPPER_SIMPLE

Simple uppercase mapping, one code point to one (ß is kept): each code point becomes its UnicodeData Simple_Uppercase_Mapping. SQL-LR UPPER_SIMPLE.

例如：Oracle unquoted (straße is stored as STRAßE, not STRASSE; verified on Oracle 23.26).

See Also:

GspCaseData.toUpperSimple(java.lang.String)

LOWER_SIMPLE

public static final IdentifierRules.CaseFold LOWER_SIMPLE

Simple lowercase mapping, one code point to one, no Final_Sigma context (İ becomes i). SQL-LR LOWER_SIMPLE.

例如：MySQL table names under lower_case_table_names=1 (verified on MySQL 8.4).

See Also:

GspCaseData.toLowerSimple(java.lang.String)

LOWER_ASCII

public static final IdentifierRules.CaseFold LOWER_ASCII

Only A..Z are lowered; every other character is kept. SQL-LR LOWER_ASCII.

例如：PostgreSQL unquoted in a UTF8 database (ÄBC is stored as Äbc; verified on PostgreSQL 16).

See Also:

GspCaseData.toLowerAscii(java.lang.String)

Method Detail

values

public static IdentifierRules.CaseFold[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (IdentifierRules.CaseFold c : IdentifierRules.CaseFold.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static IdentifierRules.CaseFold valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null