oracle分页方法及java程序实现

MSSQL SYBASE下面用top 来分页

POSTGRESQL MYSQL就直接用limit更简单了

在oracle 下面有4种方法

oracle分页技术2007年08月13日 星期一 23:08两种分页技术，第二种效率高多了
1. select * from
    (select rownum rn,t.* from table t )
    where rn <50 and rn>=1

2. select * from
    (select rownum rn,t.* from table t rownum<50)
    where rn>=1

带排序要求的分页，在9i以上的环境推荐使用分析函数
select * from
(select row_number() over(order by esn) rn,esn,akey from as_esn_info )
where rn <50 and rn>=1
（以上方法验证过）
或者以下

（1）minus差分页 ：select * from table where rownum<=10 minus select * from table where rownum<=5

（2）rownum伪列分页 ：select * from (select rownum tid,t.* from table t  where rownum<=10) where tid>5

（3）notin相反分页：select * from table where id not in(select id from table where rownum<=5) and rownum<=5



下面是第二种方法的java实现：

import java.util.List;
import javax.sql.DataSource;
import org.springframework.jdbc.core.JdbcTemplate;
/**
*
* @author renshui
* 对oracle查询进行分页
*
*/
public class Pagination {

private int totalRow; //总记录数
private int totalPage; //总页数
private int currentPage = 1; //当前页码，从1计起
private int numPerPage;  //每页记录数
    private DataSource dataSource; //数据源
private JdbcTemplate jdbcTemplate; //spring jdbcTemplate
private String sql;      //查询语句
public Pagination(String sql,int numPerpage,DataSource dataSource){
  this.setSql(sql);
  this.setNumPerPage(numPerpage);
  jdbcTemplate = new JdbcTemplate(dataSource);
  String totalSql = "select count(1) from (" + sql + ")";
  this.setTotalRow(jdbcTemplate.queryForInt(totalSql)); //设置总行数
  this.setTotalPage(); //计算总页数
 
}
  /**
   * 取得下一页内容
   * @return 下页内容的列表
   */
public List getNextPage(){
 
  if(currentPage > totalPage)
   return null;
  int startIndex = (currentPage-1) * numPerPage + 1;
  int endIndex = 0;
  if(currentPage == totalPage)
   endIndex = totalRow;
  else
   endIndex = currentPage * numPerPage;
  StringBuffer paginationSQL = new StringBuffer(" SELECT * FROM ( ");              
  paginationSQL.append(" SELECT temp.* ,ROWNUM num FROM ( ");              
  paginationSQL.append(sql);              
  paginationSQL.append("  ) temp where ROWNUM <= " + endIndex);              
  paginationSQL.append(" ) WHERE  num >= " + startIndex);
  System.out.println(paginationSQL.toString());
  List list = jdbcTemplate.queryForList(paginationSQL.toString());
  currentPage++;
  return list;
}
public int getCurrentPage() {
  return currentPage;
}

public void setCurrentPage(int currentPage) {
  this.currentPage = currentPage;
}

public DataSource getDataSource() {
  return dataSource;
}

public void setDataSource(DataSource dataSource) {
  this.dataSource = dataSource;
}

public int getNumPerPage() {
  return numPerPage;
}

public void setNumPerPage(int numPerPage) {
  this.numPerPage = numPerPage;
}

public int getTotalPage() {
  return totalPage;
}

public void setTotalPage() {
 
  if(totalRow%numPerPage == 0)
   totalPage = totalRow / numPerPage;
  else
   totalPage = totalRow / numPerPage + 1;
}

public int getTotalRow() {
  return totalRow;
}

public void setTotalRow(int totalRow) {
  this.totalRow = totalRow;
}

public String getSql() {
  return sql;
}

public void setSql(String sql) {
  this.sql = sql;
}

}