public pageReference doSearch()
    {
        System.debug('***dbPDF***'+dbPDF);
       
    display=true;
        String strQuery = 'SELECT Name, Accountnumber__c, Phone, Fax FROM Account ';
       
       // Date onOrAfterDate  = dbPDF.Instrument_Date__c;
       // Date onOrBeforeDate = con.Birthdate;
       
       
       
         if(dbPDF.name != null || dbPDF.Accountnumber__c != NULL || dbPDF.Phone != NULL || dbPDF.Fax  != NULL){
            strQuery += 'WHERE ';
        }
       
        if(dbPDF.Accountnumber__c != NULL){
            strQuery += 'name =\'' + dbPDF.name + '\' AND ' ;
        }
       
        if(dbPDF.Accountnumber__c != NULL){
            strQuery += 'Accountnumber__c =\'' + dbPDF.Accountnumber__c + '\' AND ' ;
        }
       
        if(dbPDF.Fax != NULL){
            strQuery += 'Fax  =\'' + dbPDF.Fax  + '\' AND ' ;
        }
       
        if(dbPDF.Phone != NULL){
            strQuery += 'Phone  =\''+dbPDF.Phone+ '\'AND ';
        }
  
       
       
         strQuery = strQuery.substring(0, strQuery.length()-4);
          System.debug('!!! '+strQuery);
         
             
            records = Database.query(strQuery);
                   
                    
        return null;
     }

How to add above code in below  controller code

Mypage:
--------

<apex:page controller="pagingControllerForUser1">
    <apex:form >
        <apex:pageBlock >
           
            <apex:pageMessages id="pgm"/>
           
            <apex:pageBlockButtons >
                <apex:commandButton value="Search" action="{!Search}"/>
            </apex:pageBlockButtons>
           
            <apex:pageBlockSection >
                 <apex:inputField value="{!dbPDF.name}"/>
                 <apex:inputField value="{!dbPDF.phone}"/>
                 <apex:inputField value="{!dbPDF.Fax}"/>
                <apex:inputField value="{!dbPDF.Accountnumber__c}"/>
               
 
                <!-- <apex:inputField value="{!con.Birthdate}" label="On or Before"/>-->
   
            </apex:pageBlockSection>

        </apex:pageBlock>

        <apex:pageBlock rendered="{!IF(AllSearchUsers.size != null && AllSearchUsers.size > 0, true , false)}">
                    <apex:outputPanel layout="block" styleClass="pSearchShowMore" id="otpNav2">
              Total Records Found: <apex:outputText rendered="{!IF(Con.resultSize==10000,true,false)}">10000 +</apex:outputText><apex:outputText rendered="{!IF(Con.resultSize < 10000,true,false)}">{!Con.resultSize}</apex:outputText>
                  <apex:image url="/img/search_prevarrow_disabled.gif" styleClass="prevArrow" rendered="{!NOT(Con.HasPrevious)}"/>
                  <apex:image url="/img/search_prevarrow.gif" title="Previous Page" styleClass="prevArrow" rendered="{!Con.HasPrevious}"/>
                  <apex:commandLink action="{!Previous}" title="Previous Page" value="Previous Page" rendered="{!Con.HasPrevious}"/>
                  <apex:outputPanel styleClass="pShowLess noLink" style="color:grey" rendered="{!NOT(Con.HasPrevious)}">Previous Page</apex:outputPanel>        
                  &nbsp;({!IF(Con.PageNumber == 1,1,((Con.PageNumber -1) * Con.PageSize)+1)}-{!IF(Con.resultSize < Con.PageSize,Con.resultSize,Con.PageNumber * Con.pageSize)})&nbsp;
                  <apex:outputPanel styleClass="pShowLess noLink" style="color:grey" rendered="{!NOT(Con.HasNext)}">Next Page</apex:outputPanel>        
                  <apex:commandLink title="Next Page" value="Next Page" rendered="{!Con.HasNext}" action="{!Next}"/>&nbsp;
                  <apex:image url="/img/search_nextarrow.gif" title="Next Page" styleClass="nextArrow" rendered="{!Con.HasNext}"/>
                  <apex:image url="/img/search_nextarrow_disabled.gif" rendered="{!NOT(Con.HasNext)}"/>         
              </apex:outputPanel>
           
           <apex:pageBlockSection columns="1">
               <apex:pageBlockTable var="UR" value="{!AllSearchUsers}" id="pbTable">
                <apex:column value="{!UR.Name}" />
                <apex:column headerValue="Accountnumber">
                    <apex:commandLink value="{!UR.Accountnumber__c}" action="{!displayFields}">
                        <apex:param name="RecordId Id" value="{!UR.Id}" assignTo="{!RecordId}"/>
                    </apex:commandlink>
                </apex:column>
                <apex:column value="{!UR.phone}" />
                <apex:column value="{!UR.Fax}" />
             
               
            </apex:pageBlockTable>
            </apex:pageBlockSection>
            <apex:outputPanel layout="block" styleClass="pSearchShowMore" id="otpNav">
              Total Records Found: <apex:outputText rendered="{!IF(Con.resultSize==10000,true,false)}">10000 +</apex:outputText><apex:outputText rendered="{!IF(Con.resultSize < 10000,true,false)}">{!Con.resultSize}</apex:outputText>
                  <apex:image url="/img/search_prevarrow_disabled.gif" styleClass="prevArrow" rendered="{!NOT(Con.HasPrevious)}"/>
                  <apex:image url="/img/search_prevarrow.gif" title="Previous Page" styleClass="prevArrow" rendered="{!Con.HasPrevious}"/>
                  <apex:commandLink action="{!Previous}" title="Previous Page" value="Previous Page" rendered="{!Con.HasPrevious}"/>
                  <apex:outputPanel styleClass="pShowLess noLink" style="color:grey" rendered="{!NOT(Con.HasPrevious)}">Previous Page</apex:outputPanel>        
                  &nbsp;({!IF(Con.PageNumber == 1,1,((Con.PageNumber -1) * Con.PageSize)+1)}-{!IF(Con.resultSize < Con.PageSize,Con.resultSize,Con.PageNumber * Con.pageSize)})&nbsp;
                  <apex:outputPanel styleClass="pShowLess noLink" style="color:grey" rendered="{!NOT(Con.HasNext)}">Next Page</apex:outputPanel>        
                  <apex:commandLink title="Next Page" value="Next Page" rendered="{!Con.HasNext}" action="{!Next}"/>&nbsp;
                  <apex:image url="/img/search_nextarrow.gif" title="Next Page" styleClass="nextArrow" rendered="{!Con.HasNext}"/>
                  <apex:image url="/img/search_nextarrow_disabled.gif" rendered="{!NOT(Con.HasNext)}"/>         
              </apex:outputPanel>

        </apex:pageBlock>

    </apex:form>
</apex:page>

Example   Controller:
--------------------------------

public class pagingControllerForUser
{
    public List<Account> AllSearchUsers
    {
        get
        {
            if(con != null)
                return (List<Account>)con.getRecords();
            else
                return null ;
        }
        set;}
   
    public Account usr {get; set;}
   
    //Controller
    public pagingControllerForUser()
    {
        AllSearchUsers = new List<Account>() ;
        usr = new Account() ;
    }
   
     public PageReference Search()
    {  
        if(usr.Name != null)
        {
            con = new ApexPages.StandardSetController(Database.getQueryLocator([select Id , name , phone,Fax from Account where name = :usr.Name]));

            // sets the number of records in each page set
            con.setPageSize(25);
        }
        else
        {
            con = null;
        }
        return null ;
    }
   
    //Instantiate the StandardSetController
    public ApexPages.StandardSetController con{get; set;}
   
    //Boolean to check if there are more records after the present displaying records
    public Boolean hasNext
    {
        get
        {
            return con.getHasNext();
        }
        set;
    }

    //Boolean to check if there are more records before the present displaying records
    public Boolean hasPrevious
    {
        get
        {
            return con.getHasPrevious();
        }
        set;
    }

    //Page number of the current displaying records
    public Integer pageNumber
    {
        get
        {
            return con.getPageNumber();
        }
        set;
    }

    //Returns the previous page of records
    public void previous()
    {
        con.previous();
    }

    //Returns the next page of records
    public void next()
    {
        con.next();
    }
}


Note:In above page is my visualforce page controller i get from Google

How to add My  doSearch() in above controller?



please help me.......