MikeThomsen commented on a change in pull request #4678:
URL: https://github.com/apache/nifi/pull/4678#discussion_r536077966
##########
File path:
nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/db/impl/MySQLDatabaseAdapter.java
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@@ -35,4 +43,50 @@ public String unwrapIdentifier(String identifier) {
// Removes double quotes and back-ticks.
return identifier == null ? null : identifier.replaceAll("[\"`]", "");
}
+
+ @Override
+ public boolean supportsUpsert() {
+ return true;
+ }
+
+ /**
+ * Tells How many times the column values need to be inserted into the
prepared statement. Some DBs (such as MySQL) need the values specified twice in
the statement,
+ * some need only to specify them once.
+ *
+ * @return An integer corresponding to the number of times to insert
column values into the prepared statement for UPSERT, or -1 if upsert is not
supported.
+ */
+ @Override
+ public int getTimesToAddColumnObjectsForUpsert() {
+ return 2;
+ }
+
+ @Override
+ public String getUpsertStatement(String table, List<String> columnNames,
Collection<String> uniqueKeyColumnNames) {
+ Preconditions.checkArgument(!StringUtils.isEmpty(table), "Table name
cannot be null or blank");
+ Preconditions.checkArgument(columnNames != null &&
!columnNames.isEmpty(), "Column names cannot be null or empty");
+ Preconditions.checkArgument(uniqueKeyColumnNames != null &&
!uniqueKeyColumnNames.isEmpty(), "Key column names cannot be null or empty");
+
+ String columns = columnNames.stream()
+ .collect(Collectors.joining(", "));
+
+ String parameterizedInsertValues = columnNames.stream()
+ .map(__ -> "?")
+ .collect(Collectors.joining(", "));
+
+ List<String> updateValues = new ArrayList<>();
Review comment:
I think it would be more succinct as:
```
String parameterizedUpdateValues = columnNames.stream().map(f => f + " =
?").collect(Collectors.joining(", "));
```
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