teeyog commented on a change in pull request #25287:
[SPARK-28552][SQL]Identification of different dialects insensitive to case by
JDBC URL prefix
URL: https://github.com/apache/spark/pull/25287#discussion_r339867433
##########
File path: sql/core/src/main/scala/org/apache/spark/sql/jdbc/JdbcDialects.scala
##########
@@ -56,13 +57,26 @@ case class JdbcType(databaseTypeDefinition : String,
jdbcNullType : Int)
*/
@DeveloperApi
abstract class JdbcDialect extends Serializable {
+ /**
+ * The tag of the database, it must be lowercase, the subsequent will match
+ * the corresponding dialect through this tag, so it must be strictly
one-to-one
+ * correspondence with jdbc url,such as:
+ * mysql url: jdbc:mysql://localhost/db dbTag: mysql
+ * oracle url: jdbc:oracle://localhost/db dbTag: oracle
+ * db2 url: jdbc:db2://localhost/db dbTag: db2
+ * ......
+ */
+ def dbTag: String
Review comment:
So how do you look like this, the canHandle in each implementation is cover
to lowercase
```
private case object MySQLDialect extends JdbcDialect {
override def canHandle(url : String): Boolean =
url.toLowerCase(Locale.ROOT).startsWith("jdbc:mysql")
```
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