Adichatz generates brute queries to fetch data from Application server or database (by default, one query per entity).
For example, the query for a Customer class is described by an XML file called $projectDirectory/resources/xml/model/customer/CustomerQUERYGENERATED.axml: 

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<queryTree xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" queryType="JQL" entityURI="adi://myproject/model.customer/CustomerMM" suffix="c" xsi:noNamespaceSchemaLocation="http://www.adichatz.org/xsd/v0.8.7/generator/queryTree.xsd">
    <jointure fieldName="address" jointureType="join fetch " suffix="a"/>
    <jointure fieldName="store" jointureType="join fetch " suffix="s"/>
    <queryPreference orderByClause="c.customerId">
        <parameter id="active" property="active" style="SWT.RIGHT" suffix="c"/>
        <parameter id="address" property="address" suffix="c"/>
        <parameter id="createDate" property="createDate" style="SWT.CENTER" suffix="c"/>
        <parameter id="customerId" property="customerId" style="SWT.RIGHT" suffix="c"/>
        <parameter id="email" property="email" suffix="c"/>
        <parameter id="firstName" property="firstName" suffix="c"/>
        <parameter id="lastName" property="lastName" suffix="c"/>
        <parameter id="lastUpdate" property="lastUpdate" style="SWT.CENTER" suffix="c"/>
        <parameter id="store" property="store" suffix="c"/>
    </queryPreference>
</queryTree>

Remarks:
The query description contains 2 parts:



Complete query by changing XML elements:
Now, we want to complete the query in two ways:

  1. Add jointures to fetch the staff of the store and the address with the city and the country of the store.
  2. Add a preference to select only Customers from USA (countryId=103) a new pagination, a new column orders and two filters.

Queries could be easily changed as shown below: 

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<queryTree xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" queryType="JQL" entityURI="adi://myproject/model.customer/CustomerMM" suffix="c" xsi:noNamespaceSchemaLocation="http://www.adichatz.org/xsd/v0.8.7/generator/queryTree.xsd">
    <jointure fieldName="address" jointureType="JOIN FETCH" suffix="a">
        <jointure fieldName="city" jointureType="JOIN FETCH" suffix="ci">
            <jointure fieldName="country" jointureType="JOIN FETCH" suffix="co"/>
        </jointure>
    </jointure>
    <jointure fieldName="store" jointureType="JOIN FETCH" suffix="s">
        <jointure fieldName="staff" jointureType="JOIN FETCH" suffix="st"/>
        <jointure fieldName="address" jointureType="JOIN FETCH" suffix="sa">
            <jointure fieldName="city" jointureType="JOIN FETCH" suffix="sci">
                <jointure fieldName="country" jointureType="JOIN FETCH" suffix="sco"/>
            </jointure>
        </jointure>
    </jointure>

	<!-- default preference -->
    <queryPreference orderByClause="c.customerId">
		<pagination firstResult="0" maxResults="50" paginated="true"/>
        <parameter id="address" suffix="c"/>
        <parameter id="customerId" style="SWT.RIGHT" suffix="c"/>
        <parameter id="createDate" style="SWT.CENTER" suffix="c"/>
        <parameter id="email" suffix="c"/>
        <parameter id="firstName" suffix="c"/>
        <parameter id="lastName" suffix="c"/>
        <parameter id="lastUpdate" style="SWT.CENTER" suffix="c"/>
        <parameter id="active" suffix="c"/>
        <parameter id="store_city" prompt="Store city" property="city" suffix="a"/>
        <parameter id="store_country" prompt="Store country" property="country" suffix="sci"/>
        <parameter id="customer_city" prompt="Customer city" property="city" suffix="a"/>
        <parameter id="customer_country" prompt="Customer country" property="country" suffix="ci"/>
        <parameter id="staff_name" prompt="Staff name" property="lastName" suffix="st"/>
    </queryPreference>


    <customizedPreferences>
    	<!-- USA Customers Column order id, fist name, name..., Bar=Navigation, ... -->
    	<preference id="usa">
		    <queryPreference orderByClause="c.customerId">
		        <pagination firstResult="0" maxResults="20" paginated="true"/>
		        <parameter prompt="Customer country" property="country" entityURI="adi://myproject/model.country/CountryMM" suffix="ci" valid="true" columnText="United States" expression="103" operator="=" id="customer_country"/>
		    </queryPreference>
		    <controllerPreference columnOrder="0, 3, 4, 1, 2, 5, 6, 7, 8" statusBarKey="Navigation" tableRendererKey="Binding">
		        <filters>
		            <filter enabled="true" text="Value in column 'active' is true." column="activeTC" searchString="true"/>
		            <filter enabled="false" text="Value in column 'store' contains string 'Australia' (Case insensitive.)." column="storeTC" searchString="Australia" exactString="false" caseInsensitive="true"/>
		        </filters>
		    </controllerPreference>
        </preference>
    </customizedPreferences>
</queryTree>

Explanations:

Lines 4-5:Fetch city and country of the address of the customer.
Line 9:fetch the staff of the customer.
Lines 10-12:Fetch address, city and country of the store of the customer.
Lines 28-32:Add parameters allowing the user to extend the selection to specified fields.
Line 38:Define a new preference, identified by usa string, column order is changed and chosen Navigation bar is Scale: User can navigates thru pages using a scale control.
Line 40:Pagination start to first element (position 0) and fetch 50 rows per page.
Line 41:select only customer from USA.
Lines 45-46:Add 2 filters: first on column Active, second on column Store. Only first filter is enabled.

Open Add navigator item to see how to create a new item in navigator to call the query with defined preference.
Open Change table include to see how to display data from new jointures in table control.