jsp頁面常用的查詢及顯示方法分析

private static List resultSetToList(ResultSet rs) throws SQLException {
 List list = new ArrayList();
 ResultSetMetaData md = rs.getMetaData();
 int columnCount = md.getColumnCount();
 while (rs.next()) {
  Map rowData = new HashMap();
  for (int i = 1; i = columnCount; i++) {
  rowData.put(md.getColumnName(i), rs.getObject(i));
  }
  list.add(rowData);
 }
 return list;
}

//查詢數(shù)據(jù)部分代碼：
…
Connection conn = DBUtil.getConnection();
PreparedStatement pst = null;
ResultSet rs = null;
try{
String sql="select emp_code, real_name from t_employee where organ_id=?";
pst = conn.preparedStatement(sql);
pst.setString(1, "101");
rs = pst.executeQuery();
List list = DBUtil. resultSetToList(ResultSet rs);
return list;
}finally{
DBUtil.close(rs, pst ,conn);
}
//JSP顯示部分代碼
%
List empList = (List)request.getAttribute("empList");
if (empList == null) empList = Collections.EMPTY_LIST;
%>
…
table cellspacing="0" width="90%">
tr> td>代碼/td> td>姓名/td> /tr>
%
Map colMap;
for (int i=0; i empList.size(); i++){
colMap = (Map) empList.get(i);
%>
tr>
td>%=colMap.get("EMP_CODE")%>/td>
td>%=colMap.get("REAL_NAME")%>/td>
/tr>
%
}// end for
%>
/table>

//查詢數(shù)據(jù)部分代碼：
import javax.sql.RowSet;
import oracle.jdbc.rowset.OracleCachedRowSet;
…
Connection conn = DBUtil.getConnection();
PreparedStatement pst = null;
ResultSet rs = null;
try{
……
String sql="select emp_code, real_name from t_employee where organ_id=?";
pst = conn.preparedStatement(sql);
pst.setString(1, "101");
rs = pst.executeQuery();
OracleCachedRowSet ors = newOracleCachedRowSet();