jdbc批量更新数据

有些时候，适合用jdbc。比如读一个大的excel文件数据到数据库

public static List<String> welfareImport(MultipartFile file,String id,String businessType,IWelfareDao welfareDao) throws IOException, SQLException,ExcelParseException {

XSSFWorkbook xssfWorkbook;

HSSFWorkbook hssfWorkbook;

Sheet sheet = null; ;

List<String> sourceData = new ArrayList<String>();

List<Map<String,Object>> listmap = new ArrayList<Map<String,Object>>();

String notExistIds = null;

String fileType = file.getOriginalFilename().substring(file.getOriginalFilename().indexOf(".")+1, file.getOriginalFilename().length());

if (fileType.equals("xls")) {

hssfWorkbook = new HSSFWorkbook(file.getInputStream());

sheet = hssfWorkbook.getSheetAt(0);

} else if (fileType.equals("xlsx")) {

xssfWorkbook = new XSSFWorkbook(file.getInputStream());

sheet = xssfWorkbook.getSheetAt(0);

} else {

System.out.println("您导入的excel格式不正确");

}

int startRow = sheet.getFirstRowNum();

int endRow = sheet.getLastRowNum();

int rows = endRow - startRow + 1;

long start = System.currentTimeMillis();

connection = DBUtil.createConnection();

connection.setAutoCommit(false);

Statement statement = (Statement) connection.createStatement();

try{

for (int i =startRow;i<=endRow;i++ ) {

Row row =sheet.getRow(i);

SimpleDateFormat sdfd = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

String sql = "update welfare_achive_info set status='1',taken_time='"+SqlHelper.sqlInjectionHelper(sdfd.format(row.getCell(1).getDateCellValue()).trim()) +"'where welfare_id='"+id+"' and foxconn_no='"+SqlHelper.sqlInjectionHelper(row.getCell(0).toString().trim())+"'";

Map<String,Object> paramMap = new HashMap<String, Object>();

if ("02".equals(businessType)) {//

//格式校验

if (!"".equals(row.getCell(1)) && !CommonUtils.checkDateFormat(row.getCell(1))){

throw new ExcelParseException("第"+(i+1)+"行第2列，福利领取日期格式不正确，参照格式2000/1/1或2000-1-1");

}

/* paramMap.put("id",id);

paramMap.put("welfareId", id);*/

/*if (String.valueOf(row.getCell(0)).indexOf(".") > 0) {

paramMap.put("foxconnNo", String.valueOf(row.getCell(0)).substring(0, String.valueOf(row.getCell(0)).indexOf(".")));

} else {

paramMap.put("foxconnNo", String.valueOf(row.getCell(0)));

} */

if (row.getCell(1) == null || "".equals(row.getCell(1).toString())) {

throw new ExcelParseException("请在第二列填上福利领取日期，参照格式2000/1/1或2000-1-1");

}

SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd");

Date date = new Date();

try {

date = row.getCell(1).getDateCellValue();

paramMap.put("takenTime",date);

} catch (Exception e) {

try {

paramMap.put("takenTime",sdf.parse(row.getCell(1).toString().trim()));

} catch (ParseException e1) {

throw new ExcelParseException("第"+(i+1)+"行，福利领取日期格式不正确，参照格式2000/1/1或2000-1-1");

}

}

statement.addBatch(sql);

}

}

}

statement.executeBatch();

connection.commit();

}catch(Exception e){

connection.rollback();

}

connection.setAutoCommit(true);

System.out.println("时间 -----------"+(System.currentTimeMillis() - start));

System.out.println("----执行完毕----");

return sourceData;

}

在执行过程中，发现数据量很大的时候，更新很慢，所以， 在表上加了一个索引，把where条件中的字段，作为索引，要不然查找很慢。