Github user chutium commented on a diff in the pull request:
https://github.com/apache/spark/pull/1612#discussion_r15452368
--- Diff: core/src/main/scala/org/apache/spark/rdd/JdbcRDD.scala ---
@@ -81,8 +105,10 @@ class JdbcRDD[T: ClassTag](
logInfo("statement fetch size set to: " + stmt.getFetchSize + " to
force MySQL streaming ")
}
- stmt.setLong(1, part.lower)
- stmt.setLong(2, part.upper)
+ val parameterCount = stmt.getParameterMetaData.getParameterCount
+ if (parameterCount > 0) stmt.setLong(1, part.lower)
+ if (parameterCount > 1) stmt.setLong(2, part.upper)
+
--- End diff --
user do not need to set parameters in SQL query if they only want to use 1
partition
such as i want to SELECT * FROM some_tbl
i do not need to write it like SELECT * FROM some_tbl WHERE 1=? and 2=? ,
then setLong(1, 1) and setLong(2, 2)
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