我試圖從下拉列表中選擇數據並檢索&將與其對應的值顯示到文本框中。要顯示的數據文本框是從數據庫(MySQL數據庫)。該腳本在JSP完成這是採取如下:從下拉菜單中選擇與數據庫對應的數據到文本框中使用JSP
issue_from.jsp
function showDataIssue(){
xmlHttp=GetXmlHttpObject()
var id=document.getElementById("part_no").value;
var url="issue_upd.jsp";// code for issue_upd.jsp is given down
url=url+"?part_no="+id;
xmlHttp.onreadystatechange=stateChanged
xmlHttp.open("GET",url,true)
xmlHttp.send(null);
}
這裏PART_NO是其值在下拉的密鑰 - 並且在選擇任何part_no值時,part_desc,serial_no,mr_no rr_no和po_no的相應值將被丟棄在文本框中播放。字段part_no,part_desc,serial_no,mr_no和rr_no位於一個名爲mr_details的表中。字段part_no,po_no在一個名爲po_details的表中。
issue_form.jsp
function stateChanged(){
if(xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){
var showdata = xmlHttp.responseText;
var strar = showdata.split(":");
if(strar.length>1){
var strname = strar[1];
document.getElementById("mr_no").value= strar[1];
document.getElementById("rr_no").value= strar[2];
document.getElementById("serial_no").value= strar[3];
document.getElementById("part_desc").value= strar[4];
document.getElementById("po_no").value= strar[5];
}
}
}
在上面的代碼中,我試圖讓字段的值。對於issue_upd.jsp的代碼如下:
issue_upd.jsp
String pn = request.getParameter("part_no").toString();
System.out.println(pn);
String data ="";
try{
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/");
Statement st=con.createStatement();
ResultSet rs=st.executeQuery("select mr_no,rr_no,serial_no,part_desc from where part_no='"+pn+"'");
ResultSet rs1=st.executeQuery("select po_no from po_details where part_no='"+pn+"'");
while(rs.next())
{
data = ":" + rs.getString("mr_no") + ": " + rs.getString("rr_no") + ": " + rs.getString("serial_no")+ ": " + rs.getInt("part_desc")+ ": " + rs1.getInt("po_no");
}
out.println(data);
System.out.println(data);
}catch(Exception e) {
System.out.println(e);
}
對於下來的我一直用Java編寫代碼的下降主要內容如下:
issue_form.java
public class issue_details {
public ResultSet get_part_no() {
ResultSet rs;
try{
Class.forName("com.mysql.jdbc.Driver");
Connection con =DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb");
Statement st=con.createStatement();
rs=st.executeQuery("select part_no from mr_details");
}
catch(Exception e) {
System.out.println(e);
rs=null;
}
return rs;
}
下拉的JSP代碼如下:
issue_form.jsp
<select id="part_no" name="part_no" onchange="showDataIssue();"/>
<% issue_details p=new issue_details();
ResultSet res = p.get_part_no();
while(res.next())
{
%>
<option value="<%=res.getString("part_no") %>"><%=res.getString("part_no")%>
<%=res.getString("part_no") %></option>
<%
} %>
問題是我無法從數據庫中檢索值。這兩個下拉值都不顯示。任何人都可以幫我找到代碼中的錯誤。這對我有很大的幫助。提前致謝。