MySQL和Oracle数据库中的分页查询

方法一：mysql数据库分页 lt;% //定义每一页显示的记录 int pageSize = 3; String strPageNo = request.getParameter(pageNo)

分页查询

//连接数据库，加载驱动

Class.forName("oracle.jdbc.driver.OracleDriver");

Connection ct = DriverManager.getConnection

("jdbc:oracle:thin:@127.0.0.1:1521:ORCL","scott","tiger");

Statement sm = ct.createStatement();

//总共有多少页

int pageCount = 0;

//总共有多少行记录

int rowCount = 0;

//每页有3行记录

int pageSize = 3;

//接收pageNow

String s_pageNow = (String)request.getParameter("pageNow");

//当前在第一页

int pageNow = 1;

if(s_pageNow != null)

{

//把s_pageNow转化为数值型

pageNow = Integer.parseInt(s_pageNow);

}

//查询表中共有多少条记录

ResultSet rs = sm.executeQuery("select count(*) from emp");

if(rs.next())

{

rowCount = rs.getInt(1);

//如果整除就是商，否则就是商加上1 可以用三元表达式代替 rowCount%pageSize==0 ？ rowCount/pageSize : rowCount/pageSize +1

if(rowCount%pageSize == 0)

{

pageCount = rowCount/pageSize;

}

else

{

pageCount = rowCount/pageSize +1;

}

}

//执行分页查询

rs = sm.executeQuery

("select * from (select a1.*,rownum rn from(select * from emp) a1 where rownum="+((pageNow-1)*pageSize+1)+" ");

while(rs.next())

{

out.println("

out.println("

out.println("

out.println("

}

//输出每一页要查找的连接

for(int i=1; i

{

out.print("["+i+"]");

}

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