sql 分页技术

分页语句
sqlserver 方案1: select top 10 * from t where id not in(select top 30 id from t order by id) order by id
方案2： select top 10 * from t where id in (select top 40 id from t order by id)oder by id desc
mysql: select * from t order by id limit 30,10
oracle: select * from (select rownum r * from t where r<=40)where r>30
分页技术:
mysql: sql ="select * from articles limit" +(pageNo-1)*pageSize + "," +pageSize;
 oracle: sql="select * from " + "(select rownum r,* from" +"(select * from articles order by posttime desc)" + "where rownum <= " +pageNo *pageSize")tmp" + "where r>" +(pageNo-1)*pageSize";
sqlserver:sql = "select top 10 * from id not id(select top " + (pageNo-1)*pageSize + "id from articles)"
 DataSource ds = new InitialContext().lookup(jndiurl); Connection cn = ds.getConnection(); //"select * from user where id=?" --->binary directive PreparedStatement pstmt = cn.prepareSatement(sql); ResultSet rs = pstmt.executeQuery() while(rs.next()) { out.println(rs.getString(1)); }