wuchong edited a comment on issue #8867: [FLINK-12956][jdbc] Introduce upsert table sink for JDBC URL: https://github.com/apache/flink/pull/8867#issuecomment-507110081 > 1.The only difference between databases is just quoteIdentifier and the upsert mechanism now. Maybe we will encounter the same data type problem with spark. And maybe will add `getJDBCType` in the future. > whether the implementation of each database requires relevant parameters and whether the order of parameters is the same. Yes, this is a problem. However, I have looked into upsert statements in several databases (mysql, postgres, sqlserver) and they requires the same parameters and the order is the same. > And I think JdbcDialect is an interface to users, it should be simpler. We should expose it because There are so many different upsert mechanisms that we don't support. Why we should expose `JdbcDialect` to users? IMO, this is an internal interface to handle different databases (well-know databases).
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