[转载]Oracle批量执行

FROM: http://www.cnblogs.com/wangyayun/p/4514411.html

//批量添加20000条数据用时8秒。
try {
   String url = "jdbc:oracle:thin:@IP:1521:orcl"; // orcl为数据库的SID
   String user = "oracle";
   String password = "oracle";
   StringBuffer sql = new StringBuffer();
   sql.append("insert into ex_log (EX_LOG_ID,EX_LOG_DATE) values (?,?)");
   Class.forName("oracle.jdbc.driver.OracleDriver");
   Connection con = (Connection) DriverManager.getConnection(url,user,password);
   // 关闭事务自动提交
   con.setAutoCommit(false);

   Long startTime = System.currentTimeMillis();
   PreparedStatement pst = (PreparedStatement) con.prepareStatement(sql.toString());
   for (int i = 0; i < list.size(); i++) {
    ExLog exLog = (ExLog)list.get(i);
    pst.setString(1, exLog.getExLogId());
    pst.setString(2, exLog.getExLogDate());
    // 把一个SQL命令加入命令列表
    pst.addBatch();
   }
   // 执行批量更新
   pst.executeBatch();
   // 语句执行完毕，提交本事务
   con.commit();
   Long endTime = System.currentTimeMillis();
   System.out.println("用时：" + (endTime - startTime));
   pst.close();
   con.close();
  } catch (ClassNotFoundException e) {
   e.printStackTrace();
  } catch (SQLException e) {
   e.printStackTrace();
  }

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下面是我的实例

        Connection conn = null;
        PreparedStatement stmt = null;

        StringBuffer sql = new StringBuffer();
        sql.append("merge into DEEPDATA.WARNING_MES t1 ");
        sql.append("using (select ? as CUSTOMER_ID,? as added,? as integrated_risk,? as inner_risk,? as industry_risk,? as region_risk from dual) t2 ");
        sql.append("on (t1.CUSTOMER_ID=t2.CUSTOMER_ID) ");
        sql.append("when matched then ");
        sql.append("update set ");
        sql.append("t1.added = t2.added,t1.integrated_risk = t2.integrated_risk,t1.INNER_RISK = t2.INNER_RISK,t1.industry_risk = t2.industry_risk,t1.region_risk = t2.region_risk ");
        sql.append("when not matched then ");
        sql.append("insert (t1.CUSTOMER_ID,t1.added,t1.integrated_risk,t1.INNER_RISK,t1.industry_risk ,t1.region_risk) ");
        sql.append("values(t2.CUSTOMER_ID,t2.added,t2.integrated_risk,t2.INNER_RISK,t2.industry_risk ,t2.region_risk)");

        try {
            conn = DriverManager.getConnection(url, dbUser, dbPassword);
            // 关闭自动提交;
            conn.setAutoCommit(false);
            stmt = conn.prepareStatement(sql.toString());

            Timestamp timestamp = Timestamp.valueOf(GetDate
                    .getTodayDate_FullFormat());

            if (result != null && result.size() > 0) {
                double tmpValue;
                for (Map<String, Object> map : result) {
                    tmpValue = Double.parseDouble(map.get(
                            ConstValue.IntegratedRisk).toString());
                    if (specialHandle.contains(map.get("id").toString())) {
                        tmpValue = tmpValue * 1.72;
                    }

                    stmt.setInt(1, Integer.parseInt(map.get("id").toString()));
                    stmt.setTimestamp(2, timestamp);
                    stmt.setDouble(3, tmpValue);
                    stmt.setDouble(4, Double.parseDouble(map.get(
                            ConstValue.InnerRisk).toString()));
                    stmt.setDouble(5, Double.parseDouble(map.get(
                            ConstValue.IndustryRisk).toString()));
                    stmt.setDouble(6, Double.parseDouble(map.get(
                            ConstValue.RegionRisk).toString()));
                    stmt.addBatch();
                }
                stmt.executeBatch();
                conn.commit();
            }

            stmt.close();
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }