[英]How to replace an array of characters in a column of text in PostgreSQL?
I have 2 text columns where I need to replace (on update) chars from array 1 ('q','x','y','z') to their index-equivalent value in array 2 ('a','b','c','d').我有 2 个文本列,我需要将数组 1('q'、'x'、'y'、'z')中的(更新时)字符替换为它们在数组 2 中的索引等效值('a'、' b','c','d')。
The closest I've come to atm is to nest the replace calls within each other like so我最接近 atm 的是将替换调用嵌套在彼此中,就像这样
UPDATE
mytable
SET
col1=replace(
replace(
replace(
replace(
col1,'q','a'
),'x','b'
),'y','c'
),'z','d'
),
col2=replace(
replace(
replace(
replace(
col2,'q','a'
),'x','b'
),'y','c'
),'z','d'
)
but surely there must be a better way to do this?但肯定必须有更好的方法来做到这一点? In my live case I have 14 of those char pairs.
在我的现场案例中,我有 14 个字符对。 If it has any relevance - the chars are a mix of japanese hieroglyphs and accented letters from Swedish alphabet.
如果它有任何相关性 - 这些字符是日本象形文字和瑞典字母表中带重音字母的混合体。
PostgreSQL have special function for this, translate() : PostgreSQL 对此有特殊功能, translate() :
update mytable set
col1 = translate(col1, 'qxyz', 'abcd'),
col2 = translate(col2, 'qxyz', 'abcd')
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