Problems With Datatable - datatable

Question

I want to pass a value from a datatable to be updated and located within 1 p: dialog to 1 p: inputText as shown in the example
and here is the datatable, well the datatable is updated based on a query from a backbean and is based on the 3 inputtext, the first inputtext is to show the data to pass to inputtext is fixed and updated who is the commnandbutton
<table width="100%" border="0" bgcolor="azure">
<tr>
<td><h:outputText value="Codigo :" class="texto"/></td>
<td width="0">
<p:inputText style="width: 100%" value="#{personaBean.codigo}" id ="idpersona" label="idpersona" maxlength="30"/></td>
<td width="25%">
<h:outputText value="Apellido Paterno :" class="texto"/></td>
<td>
<p:inputText style="width: 100%;" value="#{personaBean.pat}" id="paterno" maxlength="20" /></td>
<td>
<p:watermark value="Ingrese Apellido Paterno" for="paterno"/></td>
</tr>
<tr>
<td> </td>
<td rowspan="2">
<p:commandButton value=" B U S C A R " id="btnbuscar" update=":tabla" actionListener="#{personaBean.nombre}"/>
</td>
<td><h:outputText value="Apellido Materno :" class="texto"/></td>
<td><p:inputText style="width: 100%" value="#{personaBean.mat}" id="materno" maxlength="20"/> </td>
<td><p:watermark value="Ingrese Apellido Materno" for="materno"/> </td>
</tr>
<tr>
<td> </td>
<td><h:outputText value="Nombres :" class="texto"/></td>
<td>
<p:inputText style="width: 100%" value="#{personaBean.nomb}" id="nombres"/>
</td>
<td><p:watermark value="Ingrese Nombres " for="nombres"/> </td>
</tr>
<tr>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
</table>
</h:form>
<hr size="10" style="color: #D20005; background-color: #c2dfef; border-radius: 5px; width: 100%;"/>
<h:form id="tabla">
<p:dataTable var="Alumnos" value="#{personaBean.lsalumn}" id="dt_Alumnos"
sortMode="simple" emptyMessage="No hay Registros que Mostrar" rows="50" scrollable="true" scrollHeight="400" liveScroll="true">
<p:column headerText="Id" id="id" >
<f:facet name="header">
<h:outputText value=" CODIGO " class="text"/>
</f:facet>
<h:outputText value="#{Alumnos.persona}"/>
</p:column>
<p:column >
<f:facet name="header" >
<h:outputText value=" APELLIDOS Y NOMBRES" class="text" />
</f:facet>
<h:outputText value="#{Alumnos.nombres}"/>
</p:column>
<p:column style="width: 4%" exportable="false">
<p:commandButton actionListener="#{personaBean.vercodificacion}" >
<f:setPropertyActionListener value=""
</p:commandButton>
</p:column>
</p:dataTable>
</h:form>
<!-- <f:facet name="footer">
<p:commandButton id="btnbuscCancelar" oncomplete="DialogFrmUbigeo.hide()" icon="nuevo.png" update=":fotos" title="Cancelar" value="Cancelar"/>
</f:facet> -->
</p:dialog>