Question

因为在SAP Hana中，“ inner”关键字是一个保留关键字，所以我正在寻找Java regex用我的Hana查询中的新关键字替换所有出现的inner关键字，而使内部联接和“ as internal”保持不变

下面是我输入的Hana查询：

select INNER.*, INNER.stud_id as "inner", INNER . stud_id 
from (select NVL(qs.qual_id,qr.qual_id) AS qualIDRoot,qr.stud_id, qr.qual_id as qualID
      from pa_stud_qual_relation qr,
               pa_qual_subqual qs                
         where 1 = 1
             and qs.qual_id_sub(+)=qr.qual_id
          group by qr.stud_id, qr.qual_id, NVL(qs.qual_id,qr.qual_id) 
     ) INNER
inner join pa_qual_cpnt qc on INNER.qualid=qc.qual_id
WHERE (INNER.QUALIDROOT =  INNER.QUALID or INNER.QUALID is NULL)

结果查询应如下所示：

select newKeyword.*, newKeyword.stud_id as **"inner"**, newKeyword . stud_id 
from (select NVL(qs.qual_id,qr.qual_id) AS qualIDRoot,qr.stud_id, qr.qual_id as qualID
      from pa_stud_qual_relation qr,
               pa_qual_subqual qs                
         where 1 = 1
             and qs.qual_id_sub(+)=qr.qual_id
          group by qr.stud_id, qr.qual_id, NVL(qs.qual_id,qr.qual_id) 
     ) newKeyword
**inner join** pa_qual_cpnt qc on newKeyword.qualid=qc.qual_id
WHERE (newKeyword.QUALIDROOT =  newKeyword.QUALID or newKeyword.QUALID is NULL) .

我尝试了多种不同的正则表达式组合，但无法获得理想的结果。

String test = sql;

Pattern r = Pattern.compile("(\\binner\\b)[^(inner\\s+join)]", 
Pattern.CASE_INSENSITIVE);  // To combine postive and negative regex
Matcher m = r.matcher(sql);
    while (m.find()) {
        String str = m.group(0);

        System.out.println(str);
        test = test.replace(str, "newKeyword");
    }

先谢，阿里

Answer 1

在我看来，您在这里使事情变得过于复杂。我的意思是，除非您从示例中忽略了一些复杂性，否则您需要做的只是：

query
.replaceAll("INNER","newKeyword") //keyword replace
.replaceAll("inner join","**innej join**") //stars around inner join
.replaceAll("\"inner\"", "**\"inner\"**") //stars around inner in quotes

如果您不能依靠INNER在newKeyword情况下总是大写，则可以替换inner.并在该方面也可以。

Java正则表达式结合了正负表达式

1 个答案: