How to retrieve data and display in JSP page

Question

hi,
i am trying to retrieve data from SQL server 2000 and display in JSP Page. I have already place the codes of the retrieve in the bean file. I wanna ask is that how to display in the JSP page. If possible, can provide example codings for mi to reference?
Thanks
Regards,
shixuan

Answer 1

HI Tan ,
I pressume that you wanted to make use of PDK, the code can go like this .
<b><u>1) JAVA file</u></b>
import com.sapportals.htmlb.DropdownListBox;
     import com.sapportals.htmlb.InputField;
     import com.sapportals.htmlb.event.Event;
     import com.sapportals.htmlb.page.DynPage;
     import com.sapportals.htmlb.page.PageException;
     import com.sapportals.portal.htmlb.page.JSPDynPage;
     import com.sapportals.portal.htmlb.page.PageProcessorComponent;
     import com.sapportals.portal.prt.component.IPortalComponentRequest;
     import com.sapportals.portal.prt.component.IPortalComponentSession;
     import com.sapportals.portal.prt.component.IPortalComponentContext;
     import java.sql.*;
     public class P_SAP_B_User extends PageProcessorComponent
     * Method          :           getPage()
     * Description      :                         
     * Input Parameters     :     None
     * Returns          :          Object of Class DynPage     
          public DynPage getPage()
              return new P_SAP_B_UserDynPage();
            }     // end of dynPage()
            public static class P_SAP_B_UserDynPage extends JSPDynPage
              /* Variable Declaration     */
               /* Object of bean class P_SAP_B_CreateUser initialised to null */
                   private P_SAP_B_CreateUser createUserBean = null;
              /* Flags for checking the occurance of Event & Error. */
              private int iFlag=0;
              private int iErrFlag=0;
              /* Variables for storing the information
                      entered by user in each text field */
              private String sFname;
              private String sSname;
              private String sAge;
              private String sExp;
              private String sSkill;
              private String sUnit;
     * Method          :           doInitialization()
     * Description      :                         
     * Input Parameters     :     None
     * Returns          :          None
              public void doInitialization()
                     IPortalComponentSession componentSession = ((IPortalComponentRequest)getRequest()).getComponentSession();
                     Object o = componentSession.getValue("createUserBean");
                     if(o==null || !(o instanceof P_SAP_B_CreateUser))
                       createUserBean = new P_SAP_B_CreateUser();
                       componentSession.putValue("createUserBean",createUserBean);
                    }     // end of if
                     else
                         createUserBean = (P_SAP_B_CreateUser) o;
                     }     // end of else
               }//end of doInitialisation()
     * Method          :           onUpdate()
     * Description      :                         
     * Input Parameters     :     object of Event class
     * Returns          :          None
               public void onUpdate(Event e)throws PageException
                    /*     sets flag to 1 when update button is clicked. */
                    iFlag=1;
     * Method          :           doProcessAfterInput()
     * Description      :                         
     * Input Parameters     :     None
     * Returns          :          None
              public void doProcessAfterInput() throws PageException
                         InputField ifFirstName = (InputField) getComponentByName("FirstName");
                         InputField ifSecondName = (InputField) getComponentByName("SecondName");
                         InputField ifAge = (InputField) getComponentByName("Age");
                         InputField ifExp = (InputField) getComponentByName("Exp");
                         InputField ifSkill = (InputField) getComponentByName("Skill");
                         DropdownListBox dlbUnit = (DropdownListBox) getComponentByName("Unit");
                         int iAge,iExp;
                         IPortalComponentRequest request = (IPortalComponentRequest) this.getRequest();
                        IPortalComponentContext myContext = request.getComponentContext();
                         P_SAP_B_CreateUser myNameContainer = (P_SAP_B_CreateUser) myContext.getValue("createUserBean");
                         if(ifFirstName != null)
                              this.sFname = ifFirstName.getValueAsDataType().toString() ;
                         }     // end of if
                         if(ifSecondName!= null)
                              this.sSname = ifSecondName.getValueAsDataType().toString() ;
                         }      // end of if
                         if(ifAge!= null)
                              this.sAge = ifAge.getValueAsDataType().toString() ;
                         }     // end of if
                         if(ifExp!= null)
                              this.sExp = ifExp.getValueAsDataType().toString() ; 
                         }     // end of if                         
                         if(ifSkill != null)
                              this.sSkill = ifSkill.getValueAsDataType().toString() ;          
                         }     // end of if
                         if(dlbUnit != null)
                              this.sUnit = dlbUnit.getSelection().toString() ;     ;
                         }      // end of if
                      /* Data Validation */
                         /* try block for numeric Exception */
                         try
                             /* checking for any field left blank by the user */
                              if(sFname.equals("") || sSname.equals("") ||  sAge.equals("")|| sExp.equals("") || sSkill.equals(""))
                                    /* set error flag to 1 in case of any field left blank */
                                    iErrFlag=1;
                              } // end of if
                              else
                                    /* converting Age and Experience fields (String) to integer */
                                     iAge= Integer.parseInt(sAge);
                                     iExp= Integer.parseInt(sExp);
                                   /* setting the boundaries on the value in Age Field */
                                     if(iAge<0)
                                         /* set error flag to 2 in case of age below 0 */
                                         iErrFlag=2;
                                     }// end of if
                                   /* setting the boundaries on the value in Experience field */
                                      else if(iExp<0 ||(iExp/12)>=iAge)
                                          /* set error flag to 3 in case of experience below 0 or exceeding the age in years */
                                          iErrFlag=3;
                                      }// end of else if
                                      /* In case of no error */
                                      else
                                         /* setting the bean variables */
                                         try
                                             Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
                                             Connection con = DriverManager.getConnection("jdbc:odbc:Test");
                                             String query="insert into UserData values(?,?,?,?,?,?)";
                                             PreparedStatement prestat=con.prepareStatement(query);
                                             /* setting the values to be inserted into the user table */
                                             prestat.setString(1,sFname);
                                             prestat.setString(2,sSname);
                                             prestat.setString(3,sAge);
                                             prestat.setString(4,sExp);
                                             prestat.setString(5,sSkill );
                                             prestat.setString(6,sUnit);
                                             prestat.executeUpdate() ;
                                             prestat.close();
                                             con.close();
                                             myNameContainer.setSFname(sFname);
                                             myNameContainer.setSLname(sSname);
                                             myNameContainer.setSAge(sAge);
                                             myNameContainer.setSExp(sExp);
                                            myNameContainer.setSSkill(sSkill);
                                            myNameContainer.setSUnit(sUnit);
                                         } // end of inner try block
                                          catch(Exception sqle)
                                             myNameContainer.setErrMessage("Update failed ! Please try again." );
                                          } // end of catch corresponding to inner try
                                                       } // end of inner else
                                                  } //end of outer else
                               } //end of outer try block
                               catch(Exception e)
                                 /* setting flag to 4 in case of non-numeric age/experience values */
                                 iErrFlag = 4;
                                 /* Displaying error message corresponding to the value of error flag */
                              switch(iErrFlag)
                                /* Empty Field */
                                case 1:myNameContainer.setErrMessage( "Please Fill all the fields");
                                break;
                                /* Invalid Value in the age field */
                                case 2:myNameContainer.setErrMessage( "Enter a valid value in Age field.(Hint : Have you entered Age<0 ?");
                                break;
                                /* Invalid Value in the experience field */
                                case 3:myNameContainer.setErrMessage( "Enter a valid value in Experience field.(Hint : Experince should not be negative or greater than your age in months)");
                                break;
                                /* Non-numeric value in the Age/ experience fields */
                                case 4:myNameContainer.setErrMessage( "Please Enter Numeric Value for Age and Experience");
                                break;
                             } // end of switch-case block
          } //end of doProcessAfterInput()
     * Method          :           doProcessBeforeOutput()
     * Description      :                         
     * Input Parameters     :     None
     * Returns          :          None
              public void doProcessBeforeOutput() throws PageException
                   /* Displays Form for new user creation by default */
                   this.setJspName("P_SAP_B_UserCreationForm.jsp");
                     /* In case of an error display an error message page */
                     if(iErrFlag!=0)
                          setJspName("ErrorPage.jsp");
                     } //end of if
                     /* Displays the user's information as entered in the SQL
                        database after its been uploaded by the user */
                     else if(iFlag==1)
                         setJspName("hello.jsp");      
                      } // end of else if
              } // end of doProcessBeforeOutput()
          } // end of P_SAP_B_UserDynPage Class
     } // end of P_SAP_B_User class
* End of File P_SAP_B_User.java
2) Bean
package com.sap.usercreation;
import java.io.Serializable;
public class P_SAP_B_CreateUser implements Serializable
     private String sFname;
     private String sLname;
     private String sUnit;
     private String sSkill;
     private String sExp;
     private String sAge;
     private String errMessage;
     * @return
     public String getSFname() {
          return sFname;
* @return
public String getSLname() {
     return sLname;
* @param i
* @param string
public void setSFname(String string) {
     sFname = string;
* @param string
public void setSLname(String string) {
     sLname = string;
* @return
public String getSUnit() {
     return sUnit;
* @param string
public void setSUnit(String string) {
     sUnit = string;
* @return
public String getSSkill() {
     return sSkill;
public void setSSkill(String string) {
     sSkill = string;
* @return
public String getSAge() {
     return sAge;
* @return
public String getSExp() {
     return sExp;
* @param string
public void setSAge(String string) {
     sAge = string;
* @param string
public void setSExp(String string) {
     sExp = string;
* @return
public String getErrMessage() {
     return errMessage;
* @param string
public void setErrMessage(String string) {
     errMessage = string;
3) The Jsp file i have already posted.
See if you copy this code and paste it wont work as i have not given you full code ,But yes this gives you an overview of how things can be done .
Thanx
Pankaj