[Solr Wiki] Update of "DataImportHandler" by NoblePaul

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The following page has been changed by NoblePaul:
http://wiki.apache.org/solr/DataImportHandler

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   * '''`user`''' : User name
   * '''`password`''' : The password
   * '''`batchSize`''' : The batchsize used in jdbc connection
+  * '''`autoCommit`''' : If set to 'false' it sets  `setAutoCommit(false)`;
+  * '''`readOnly`''' : If this is set to 'true' , it sets `setReadOnly(true)`, `setAutoCommit(true)`, `setTransactionIsolation(TRANSACTION_READ_UNCOMMITTED)`,`setHoldability(CLOSE_CURSORS_AT_COMMIT)` on the connection
+  * '''`transactionIsolation`''' : The possible values are '[TRANSACTION_READ_UNCOMMITTED
+ 
+ 
  Any extra attributes put into the tag are directly passed on to the jdbc driver.
  
  == Configuration in data-config.xml ==