How to connect with Database using Param in Lightning Component

public class ConnectionWithDatabaseUsingParam{
    @AuraEnabled
    public static string combine(string apexfname,string apexlname){
        string namer =  apexfname +' '+ apexlname;
        return namer;
    }    
}

<aura:component controller="ConnectionWithDatabaseUsingParam">
    <aura:attribute name="myname" type="string"/>
    <lightning:input label="Enter First Name" aura:id="fnameid"/>
    <lightning:input label="Enter Last Name" aura:id="lnameid"/>
    <Lightning:button label="Click" onclick="{!c.FullName}"/>
    <div>
        NAME : {!v.myname}
    </div>
</aura:component>

({
    FullName : function(component, event, helper) {
        var fname=component.find("fnameid").get('v.value');
        var lname=component.find("lnameid").get('v.value');
        var action=component.get('c.combine');
        
        action.setParams({"apexfname":fname,"apexlname":lname});	
        
        action.setCallback(this,function(response){
            var state=response.getState();
            if(state === 'SUCCESS'){
                var result = response.getReturnValue();
                component.set('v.myname',result);
            }
        });
        
        $A.enqueueAction(action);
        
    }
})

<aura:application extends="force:slds" >
    <c:Basic6 />
</aura:application>