[SPARK-10946][SQL] JDBC - Use Statement.executeUpdate instead of...

[SPARK-10946][SQL] JDBC - Use Statement.executeUpdate instead of PreparedStatement.executeUpdate for DDLs

New changes with JDBCRDD

Author: somideshmukh <somilde@us.ibm.com>

Closes #9733 from somideshmukh/SomilBranch-1.1.

sql/core/src/main/scala/org/apache/spark/sql/DataFrameWriter.scala

@@ -297,7 +297,7 @@ final class DataFrameWriter private[sql](df: DataFrame) {
       if (!tableExists) {
         val schema = JdbcUtils.schemaString(df, url)
         val sql = s"CREATE TABLE $table ($schema)"
-        conn.prepareStatement(sql).executeUpdate()
+        conn.createStatement.executeUpdate(sql)
       }
     } finally {
       conn.close()

sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JdbcUtils.scala

@@ -55,7 +55,7 @@ object JdbcUtils extends Logging {
    * Drops a table from the JDBC database.
    */
   def dropTable(conn: Connection, table: String): Unit = {
-    conn.prepareStatement(s"DROP TABLE $table").executeUpdate()
+    conn.createStatement.executeUpdate(s"DROP TABLE $table")
   }
 
   /**