修复所有数据库性能问题

WebRoot/delete_user.jsp

@@ -42,11 +42,12 @@
 									String url = "jdbc:mysql://localhost:3306/db_school?useUnicode=true&characterEncoding=utf-8";
 									String user = "root";
 									String password = "";
+									Class.forName(driverClass);
+									try {
 									ResultSet rs = null;
 									Connection conn = null;
 									PreparedStatement sql = null;
-									try {
-										Class.forName(driverClass);
+										
 										conn = DriverManager.getConnection(url, user, password);
 										Statement stmt = conn.createStatement();
 										sql = conn.prepareStatement("select * from show_user");
@@ -56,14 +57,16 @@
 								<option value="<%=rs.getString("userName")%>"><%=rs.getString("userName")%></option>
 								<%
 									}
+									sql.close();
+									rs.close();
+									conn.close();
+									stmt.close();
 									} catch (Exception ex) {
 										ex.printStackTrace();
 									}
 								%>
 								<%
-									sql.close();
-									rs.close();
-									conn.close();
+									
 								%>
 							</select>
 						</div>