[转载]Oracle批量执行
2024-08-26 22:29:12
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();
}
-------------------------------------------------------------------------------------
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();
}
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