分页查询SQL jdbcDAO oracle JdbcTemplate 【给我发表点意见】

import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.ResultSetExtractor;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.RowMapperResultReader;

public class JdbcDAO extends JdbcTemplate
String sql = "";

  String tsql = "";

  int startNum = -1;

  int pageSize = -1;

  int count = 0;
1），获取分页数据
public List queryJdbcForOnePage(String sql, int startNum, int pageSize)
    throws PioaGisException
  {
    this.tsql = sql;
    this.startNum = startNum;
    this.pageSize = pageSize;
    sql = "SELECT * FROM (SELECT A.*,ROWNUM R FROM (" + sql +
      ") A WHERE ROWNUM <=" + (startNum + pageSize) +
      ") B WHERE B.R > " + startNum;
    List listContent = query(sql,
      new RowMapperResultReader(new DataRowMapper()));
    List list = new LinkedList();
    list.add(this.fieldNames);
    for (int i = 0; i < listContent.size(); ++i) {
      list.add(listContent.get(i));
    }
    return list;
  }
示例：
SELECT * FROM (SELECT A.*,ROWNUM R FROM (SELECT 字段名 FROM 表名 WHERE ( 1 = 1 ) ORDER BY 字段名 DESC) A WHERE ROWNUM <=10) B WHERE B.R > 0
2），获取数据的数量
public int queryJdbcForMaxNum()
    throws PioaGisException
  {
    String temp = this.tsql;
    if (this.tsql.indexOf("ORDER BY") != -1)
      temp = this.tsql.substring(this.tsql.indexOf("FROM"), this.tsql.indexOf("ORDER BY"));
    else {
      temp = this.tsql.substring(this.tsql.indexOf("FROM"));
    }
    String tempsql = "SELECT COUNT(1) " + temp;
    Map map = queryJdbcForOneRow(tempsql);
    int count = Integer.parseInt(map.get("COUNT(1)").toString());
    return count;
  }
public Map queryJdbcForOneRow(String sql)
    throws PioaGisException
  {
    List list = query(sql, new OneRowMapper());
    if ((list != null) && (list.size() > 0)) {
      return (Map)list.get(0);
    }
    return null;
  }