Oracle-函数-替换字符串
在平常的⼯作当中,经常需要替换字符串中的字符,⽐如将⾝份证号1991年的全部替换为2001年,替换的⽅式有三种(TRANSLATE、REPLACE、REGEXP_REPLACE),⽀持嵌套调⽤:
/*
REPLACE(char,search_string,replacement_string)
'1991' is search_string
'2001' is replacement_string
REPLACE returns char with every occurrence of search_string replaced with replacement_string.
If replacement_string is omitted or null, then all occurrences of search_string are removed.
If search_string is null, then char is returned.
REPLACE的实现是由TRANSLATE函数为基础,在REPLACE中,原值和被替换项与替换后的项数据类型⽀持:CHAR, VARCHAR2, NCHAR, NVARCHAR2, CLOB, or NCLOB */
SELECT REPLACE('2301231991','1991','2001') FROM DUAL;
执⾏结果为:'2301232001'
TRANSLATE(char, from_string, to_string)
--' */''' is from_strin
--'_' is to_string
--被替换项从左⾄右依次替换,替换项按照使⽤个数递减,若替换项不⾜则替换为''
SELECT TRANSLATE('SQL*Plus User''s Guide', ' */''', '_') FROM DUAL;
--执⾏结果为:SQLPlus_Users_Guide
SELECT TRANSLATE('SQL*Plus User''s Guide', ' */''', '__') FROM DUAL;
--执⾏结果为:SQL_Plus_Users_Guide
SELECT TRANSLATE('SQL*Plus User''s Guide', ' */''', '___') FROM DUAL;
-
-执⾏结果为:SQL_Plus_Users_Guide
SELECT TRANSLATE('SQL*Plus User''s Guide', ' */''', '____') FROM DUAL;
--执⾏结果为:SQL_Plus_User_s_Guide
REGEXP_REPLACE(source_char,match_parameter,replace_string)
oracle切割字符串函数--REGEXP_REPLACE的实现是由REPLACE函数为基础,⽀持正则表达式,可以进⾏复杂字符处理
SELECT REGEXP_REPLACE('132.546.7890','([[:digit:]]{3})\.([[:digit:]]{3})\.([[:digit:]]{4})','(\1) \2-\3') FROM DUAL ;
--The following example examines phone_number, looking for the xx. Oracle reformats this pattern with (xxx) xxx-xxxx.
--执⾏结果为:(132) 546-7890
SELECT REGEXP_REPLACE('500 Oracle Parkway, Redwood Shores, CA','( ){2,}', '') FROM DUAL;
-
-The following example examines the string, looking for two or more spaces. Oracle replaces each occurrence of two or more spaces with a single space.
--执⾏结果为:500 Oracle Parkway, Redwood Shores, CA
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