Spring JdbcTemplate的batchUpdate中，没有看到conn.setAutoCommit(false)的操作

jdbcTemplate的batchupdate操作：

SpringJdbcTemplate的batch操作最后还是利用了JDBC提供的方法，Spring只是做了一下改造JDBC的batch操作：

final List<ExpressFreightBillImportDetail> tempOrderList = records;   
	       jdbcTemplate.batchUpdate(sql,new BatchPreparedStatementSetter() {  
	            @Override
	            public int getBatchSize() {  
	                 return tempOrderList.size();   
	            }
	            
	            @Override  
	            public void setValues(PreparedStatement ps, int i) throws SQLException {
	            	ps.setString(1, StringUtil.nullConvertToEmptyString(tempOrderList.get(i).getOrderNo()));
	            	ps.setInt(2, tempOrderList.get(i).getGoodNum());
	            	ps.setString(3, StringUtil.nullConvertToEmptyString(tempOrderList.get(i).getCollectPerson()));
	            	ps.setString(4, StringUtil.nullConvertToEmptyString(tempOrderList.get(i).getDeliveryPerson()));
	            	ps.setBigDecimal(5, tempOrderList.get(i).getSumFee());
	            	ps.setBigDecimal(6, tempOrderList.get(i).getDeliveryFee());
	            	ps.setBigDecimal(7, tempOrderList.get(i).getPackageFee());
	            	ps.setBigDecimal(8, tempOrderList.get(i).getInsuredFee());
	            	ps.setBigDecimal(9, tempOrderList.get(i).getCod());
	            	ps.setLong(10, StringUtil.nullConvertToLong(tempOrderList.get(i).getDeliveryBranchId()));
	            	ps.setString(11, StringUtil.nullConvertToEmptyString(tempOrderList.get(i).getDeliveryBranch()));
	            	ps.setLong(12, tempOrderList.get(i).getBillId());
	            	ps.setString(13, StringUtil.nullConvertToEmptyString(tempOrderList.get(i).getBillNo()));
	            	ps.setInt(14, tempOrderList.get(i).getEffectFlag());
	            	ps.setString(15, StringUtil.nullConvertToEmptyString(tempOrderList.get(i).getDismatchReason()));
	            	ps.setLong(16, StringUtil.nullConvertToLong(tempOrderList.get(i).getImportPersonId()));
	            	ps.setString(17, StringUtil.nullConvertToEmptyString(tempOrderList.get(i).getImportPerson()));
	            	ps.setDate(18, new java.sql.Date(tempOrderList.get(i).getImportTime().getTime()));
	            }   
	      });   

为什么在Spring JdbcTemplate的batchUpdate中，没有看到conn.setAutoCommit(false)的操作？ 
这是因为Spring有它自己的事务管理机制 
如果你配置了JDBC的事务管理，那么DataSourceTransactionManager会自动设置 

DataSourceTransactionManagerr的doBegin方法。

下面我们可以看下：spring中的源码：

public int[] batchUpdate(String sql, final BatchPreparedStatementSetter pss) throws DataAccessException {
		if (logger.isDebugEnabled()) {
			logger.debug("Executing SQL batch update [" + sql + "]");
		}

		return execute(sql, new PreparedStatementCallback<int[]>() {
			public int[] doInPreparedStatement(PreparedStatement ps) throws SQLException {
				try {
					int batchSize = pss.getBatchSize();
					InterruptibleBatchPreparedStatementSetter ipss =
							(pss instanceof InterruptibleBatchPreparedStatementSetter ?
							(InterruptibleBatchPreparedStatementSetter) pss : null);
					if (JdbcUtils.supportsBatchUpdates(ps.getConnection())) {
						for (int i = 0; i < batchSize; i++) {
							pss.setValues(ps, i);
							if (ipss != null && ipss.isBatchExhausted(i)) {
								break;
							}
							ps.addBatch();
						}
						return ps.executeBatch();
					}
					else {
						List<Integer> rowsAffected = new ArrayList<Integer>();
						for (int i = 0; i < batchSize; i++) {
							pss.setValues(ps, i);
							if (ipss != null && ipss.isBatchExhausted(i)) {
								break;
							}
							rowsAffected.add(ps.executeUpdate());
						}
						int[] rowsAffectedArray = new int[rowsAffected.size()];
						for (int i = 0; i < rowsAffectedArray.length; i++) {
							rowsAffectedArray[i] = rowsAffected.get(i);
						}
						return rowsAffectedArray;
					}
				}
				finally {
					if (pss instanceof ParameterDisposer) {
						((ParameterDisposer) pss).cleanupParameters();
					}
				}
			}
		});
	}

其中对批量操作还进行了判断，如果可以则执行批量操作，否则一条一条的插入记录。

将excel数据导入数据库的程序时，由于数据量大，准备采用jdbc的批量插入。于是用了preparedStatement.addBatch();当加入1w条数据时，再执行插入操作，preparedStatement.executeBatch()。原以为这样会很快，结果插入65536条数据一共花30多分钟，完全出乎我的意料。网上百度了一下在处理这种大批量数据导入的时候是如何处理的，发现大部分都是用的jdbc批量插入处理，但不同的是：他们使用了con.setAutoCommit(false);然后再preparedStatement.executeBatch()之后，再执行con.commit();网上摘了一段说明：

* When importing data into InnoDB, make sure that MySQL does not have autocommit mode enabled because that

      requires a log flush to disk for every insert. To disable autocommit during your import operation, surround it with

      SET autocommit and COMMIT statements:

      SET autocommit=0;
     ... SQL import statements ...
     COMMIT;