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@SessionScoped
@ManagedBean
public class MySessionBean {
	private List<MyInterface> data;
	
	@PostConstruct
	public void initData() {
                // Beware of the pseudo code :)
		if(TODAY == HAPPY_CADAVER) {
			data = HAPPY_CADAVER_DATA;
		} else {
			data = NORMAL_DAY_DATA;
		}
	}
	
	public List<MyInterface> getData() {
		return data;;
	}
}

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<p:dataTable value="#{mySessionBean.data}" var="myInterface"> ... </p:dataTable>

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@SessionScoped
@ManagedBean
public class MySessionBean {
	private List<MyDatabaseTable1> data1;
	private List<MyDatabaseTable2> data2;
	private DataTable table;
	@PostConstruct
	public void initData() {
                // Beware of the pseudo code :)
		if(someCondition) {
			table.source = data1;
		} else {
			table.source = data2;
		}
	}
	
	public List<MyInterface> getData() {
		return data;;
	}
}

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<p:dataTable value="#{mySessionBean.dataFromAnySource}" var="anySource"> ... <p:dataTable>

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public List<Data> getDataFromAnySource() { ... }

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<p:selectOneMenu value="#{dbmBean.selectedTable}" style="height:27px" >
    <c:forEach items="#{dbmBean.tableNames}" var="table">
        <f:selectItem itemLabel="#{table.value}" itemValue="#{table.key}"/>
    </c:forEach>
</p:selectOneMenu>
<p:commandButton value="Go" action="#{dbmBean.goToTable}" ajax="false" />
...
<p:dataTable binding="#{dbmBean.table}" var="row" rowIndexVar="index">
<f:facet name="header"/>
<p:columns value="#{dbmBean.columns}" var="column" columnIndexVar="colIndex" >  
        <f:facet name="header">  
            #{column.header}  
        </f:facet>
        <h:outputText value="#{row[column.property]}"/>
    </p:columns>
</p:dataTable>

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public class DatabaseManagerBean implements Serializable {
    private List<ColumnModel> columns; // Column model is a simple class with two string properties: header, property
    ...    
    public void goToTable() {
        int tableIndex = new Integer(this.selectedTable);
        switch (tableIndex) {
            case 1:
                 Players tempPlayers = new Players(); //the class which get data from a database table
                 this.players = tempPlayers.getAllPlayers();
                 this.columnNames = tempPlayers.getColumnNames();
                 for (String colName : columnNames) {
                    columns.add(new ColumnModel(colName.toUpperCase(), colName));
                 }
                 table.setRendered(true);
                 table.setValue(this.players);
                 break;
                 ...
                 default:
                 table.setRendered(false);
         } //end of switch statement
    } //end of goToTable() method
} //end of DatabaseManagerBean