jabc bath 与prepareStatement的结合应用

String sql = "insert into "
				+ T_PROD
				+ month
				+ "(id,SERV_ID,ACC_NBR,PROD_ID,IS_PHS_TK,CREATE_DATE,CUST_ID,STATE,CITY)"
				+ " values(seq_rep_ogn_prod_id.nextval,?,?,?,?,?,?,?,?)";

		try {
			in = new BufferedReader(new FileReader(d.getPath() + filename));
			conn.setAutoCommit(false);
			pstm = conn.prepareStatement(sql);			String linedata = in.readLine();
			int i = 1;
			Long SERV_ID = null;
			String ACC_NBR = "";
			Long PROD_ID = null;
			String IS_PHS_TK = "";
			java.util.Date date = null;
			Timestamp CREATE_DATE = null;
			Long CUST_ID = null;
			String STATE = "";
			String CITY = "";

			while (linedata != null) {
				String[] data = linedata.split("\\;");
				if (data.length != 7) {
					log("read 第  " + i + "行" + linedata);
					//log("长度不够或超出了。");
				} else {
					try {
						if (data[0].trim().length() != 0) {
							SERV_ID = Long.parseLong(data[0].trim());
						} else {
							SERV_ID = null;
						}
						// SERV_ID = Long.parseLong(data[0].trim());
						ACC_NBR = data[1].trim();
						if (data[2].trim().length() != 0) {
							PROD_ID = Long.parseLong(data[2].trim());
						} else {
							PROD_ID = null;
						}
						// PROD_ID = Long.parseLong(data[2].trim());
						IS_PHS_TK = data[3].trim();

						if (data[4].trim().length() <= 8) {
							date = sim2.parse(data[4].trim());
						} else {
							date = sim.parse(data[4].trim());
						}
						// date = sim.parse(data[4].trim());
						// 存入oracle时间要完整的时间类型得用到Timestamp
						CREATE_DATE = new Timestamp(date.getTime());
						if (data[5].trim().length() != 0) {
							CUST_ID = Long.parseLong(data[5].trim());
						} else {
							CUST_ID = null;
						}
						// CUST_ID = Long.parseLong(data[5].trim());
						STATE = data[6].trim();
						CITY = city.trim();

						if (SERV_ID == null) {
							pstm.setNull(1, java.sql.Types.BIGINT);
						} else {
							pstm.setLong(1, SERV_ID);
						}
						// pstm.setLong(1, SERV_ID);
						pstm.setString(2, ACC_NBR);

						if (PROD_ID == null) {
							pstm.setNull(3, java.sql.Types.BIGINT);
						} else {
							pstm.setLong(3, PROD_ID);						}
						// pstm.setLong(3, PROD_ID);
						pstm.setString(4, IS_PHS_TK);
						pstm.setTimestamp(5, CREATE_DATE);

						if (CUST_ID == null) {
							pstm.setNull(6, java.sql.Types.BIGINT);
						} else {
							pstm.setLong(6, CUST_ID);
						}
						// pstm.setLong(6, CUST_ID);
						pstm.setString(7, STATE);
						pstm.setString(8, CITY);
						
						pstm.addBatch();
						if (i % commitCount == 0 && i != 0) {
							// 利用executeBatch方法执行1000条SQL语句
							pstm.executeBatch();
							pstm.clearBatch();
							conn.commit();						}
					} catch (Exception e) {
						e.printStackTrace();
						log("read 第 " + i + "行  " + linedata);
					}
				}
				i++;
				linedata = in.readLine();
			}
			pstm.executeBatch();
			pstm.clearBatch();
			conn.commit();
			// close(); //关闭资源			in.close();
		} catch (Exception e1) {
			log(e1.getMessage());
		}

上面的代码中最主要的就是几句而已，用来下面的这几句，可以提高上百倍的数据操作插入的效率，

先取消自动commit()这个方法，用下面这句：
conn.setAutoCommit(false);
预编译一下sql语句：
pstm = conn.prepareStatement(sql);
根据sql中的位置来设置相应的参数：
pstm.setLong(3, PROD_ID);
设置完一条就加到bath里面去
pstm.addBatch();
每一千条就提交一次，不然内容会受不了的，1000这个大小可以根据实际内存来设置，
下面这两个方法是在commit()前一定要操作的，因为这样才可以释放掉内存。
pstm.executeBatch();
pstm.clearBatch();
if (i % commitCount == 0 && i != 0) {
// 利用executeBatch方法执行1000条SQL语句
pstm.executeBatch();
pstm.clearBatch();
conn.commit();

pstm.executeBatch();
pstm.clearBatch();
conn.commit();
// close(); //关闭资源
最后一定要关闭数据库连接，不然这个连接会耗费很多资源的