合并查询插入但不在Oracle上更新

Question

我在Spring中针对Oracle 11g数据库的@SQLInsert注释中获得了此查询,虽然它正确插入但它不会更新值但不会引发错误.

有任何想法吗？如果没有,任何其他方式获得相同的行为？

merge INTO ngram sn
USING(SELECT ? AS frequency,
             ? AS occurrences,
             ? AS ngram
      FROM   dual) src
ON (sn.ngram = src.ngram)
WHEN matched THEN
  UPDATE SET sn.occurrences = sn.occurrences + src.occurrences,
             sn.frequency = sn.frequency + 1
WHEN NOT matched THEN
  INSERT (ngram,
          frequency,
          occurrences)
  VALUES (src.ngram,
          src.frequency,
          src.occurrences) 

Update1:我在Java中添加了Entity def以便澄清.

@Entity(name = "NGRAM")
public class Ngram
{
    @Id
    @JsonProperty("ngram")
    private String ngram;

    @JsonProperty("frequency")
    @Column(name = "frequency")
    private int frequency;

    @JsonProperty("occurrences")
    @Column(name = "occurrences")
    private int occurrences;

Update2:在现有Ngram上添加SQL查询的运行

sql> merge INTO NGRAM sn
     USING(SELECT 1 AS frequency,
                  200 AS occurrences,
                  'year' AS ngram
           FROM   dual) src
     ON (sn.ngram = src.ngram)
     WHEN matched THEN
       UPDATE SET sn.occurrences = sn.occurrences + src.occurrences,
                  sn.frequency = sn.frequency + 1
     WHEN NOT matched THEN
       INSERT (ngram,
               frequency,
               occurrences)
       VALUES (src.ngram,
               src.frequency,
               src.occurrences)
[2019-01-29 12:09:10] 1 row affected in 19 ms

这实际上修改了行,但是当我在代码中查看它们时却没有,所以看起来SQL是正确的......

Update3:所以,这是应该插入或更新的代码段,但它只执行插入:

    List<Ngram> lNgrams = new ArrayList<>(lCollocationsMap.size());
    lCollocationsMap.forEach((pKey, pValue) -> lNgrams.add( new Ngram(pKey, 1, pValue)));
    mNgramRepo.saveAll(lNgrams);

所以我将调查saveAll行为.

Update4:我尝试逐个使用save,这比使用saveAll慢得多但行为相同.将ON(sn.ngram = src.ngram)更改为ON(sn.ngram LIKE src.ngram)会使某些频率变为2(因此它们似乎已更新)但不是全部:例如"年"出现超过10次,但它的频率仍为1,它的出现只是更新了最后找到的值.

所以,我现在完全迷失了为什么会失败,特别是这样.