Oracle'printf'等价物

问题描述

是否有以下的等价物或替代物？

  SELECT mix_type || '（'|| mix_num ||'）'as description 
 FROM acid_batch 
 WHERE mix_num< 10 
  

Oracle有类似于printf风格的格式吗？ b pre $ lt; code> SELECT printf（％s（％s），mix_type，mix_num） 10

解决方案

没有内置的Oracle函数以这种方式应用格式化字符串。尽管为这个特定的例子写一个自定义函数是很容易的，但是编写一个基于PL / SQL的printf实现将是一个挑战。

如果您经常需要这样做，也许您可​​以编写一个Oracle函数来封装Java调用，以实现更丰富的字符串处理环境。 b

Is there an equivalent or alternative to the following?

SELECT mix_type || ' (' || mix_num || ')' as description
  FROM acid_batch
 WHERE mix_num < 10

Does Oracle have something like printf style formatting?

SELECT printf("%s (%s)", mix_type, mix_num) as description,
  FROM acid_batch
 WHERE mix_num < 10

解决方案

No there are no built-in Oracle functions that apply a formatting string in this fashion. Although it would be easy to write a custom function for this specific example, writing a PL/SQL-based implementation of printf would be challenging.

If you have a frequent need for this, perhaps you could write an Oracle function that wraps a Java call for a richer string handling environment.

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