mirror of
https://github.com/ebean-orm/ebean.git
synced 2024-04-21 10:51:47 +00:00
No effective change - javadoc update on Query
This commit is contained in:
@@ -35,7 +35,6 @@ import java.util.Set;
|
||||
* <pre>{@code
|
||||
*
|
||||
* String oql =
|
||||
* " find order "
|
||||
* +" fetch customer "
|
||||
* +" fetch details "
|
||||
* +" where customer.name like :custName and orderDate > :minOrderDate "
|
||||
@@ -96,33 +95,24 @@ import java.util.Set;
|
||||
* Refer to "ALL Properties/Columns" mode of Optimistic Concurrency checking.
|
||||
* </p>
|
||||
* <pre>{@code
|
||||
* [ find {bean type} [ ( * | {fetch properties} ) ] ]
|
||||
* [ fetch {associated bean} [ ( * | {fetch properties} ) ] ]
|
||||
* [ select [ ( * | {fetch properties} ) ] ]
|
||||
* [ fetch {path} [ ( * | {fetch properties} ) ] ]
|
||||
* [ where {predicates} ]
|
||||
* [ order by {order by properties} ]
|
||||
* [ limit {max rows} [ offset {first row} ] ]
|
||||
* }</pre>
|
||||
* <p>
|
||||
* <b>FIND</b> <b>{bean type}</b> [ ( <i>*</i> | <i>{fetch properties}</i> ) ]
|
||||
* <b>SELECT</b> [ ( <i>*</i> | <i>{fetch properties}</i> ) ]
|
||||
* </p>
|
||||
* <p>
|
||||
* With the find you specify the type of beans to fetch. You can optionally
|
||||
* specify a list of properties to fetch. If you do not specify a list of
|
||||
* properties ALL the properties for those beans are fetched.
|
||||
* With the select you can specify a list of properties to fetch.
|
||||
* </p>
|
||||
* <p>
|
||||
* In object graph terms the <em>find</em> clause specifies the type of bean at
|
||||
* the root level and the <em>fetch</em> clauses specify the paths of the object
|
||||
* graph to populate.
|
||||
* </p>
|
||||
* <p>
|
||||
* <b>FETCH</b> <b>{associated property}</b> [ ( <i>*</i> | <i>{fetch
|
||||
* properties}</i> ) ]
|
||||
* <b>FETCH</b> <b>{path}</b> [ ( <i>*</i> | <i>{fetch properties}</i> ) ]
|
||||
* </p>
|
||||
* <p>
|
||||
* With the fetch you specify the associated property to fetch and populate. The
|
||||
* associated property is a OneToOnem, ManyToOne, OneToMany or ManyToMany
|
||||
* property. When the query is executed Ebean will fetch the associated data.
|
||||
* path is a OneToOne, ManyToOne, OneToMany or ManyToMany property.
|
||||
* </p>
|
||||
* <p>
|
||||
* For fetch of a path we can optionally specify a list of properties to fetch.
|
||||
@@ -153,41 +143,33 @@ import java.util.Set;
|
||||
* </p>
|
||||
* <h4>Examples of Ebean's Query Language</h4>
|
||||
* <p>
|
||||
* Find orders fetching all its properties
|
||||
* </p>
|
||||
* <pre>{@code
|
||||
* find order
|
||||
* }</pre>
|
||||
* <p>
|
||||
* Find orders fetching all its properties
|
||||
* </p>
|
||||
* <pre>{@code
|
||||
* find order (*)
|
||||
* }</pre>
|
||||
* <p>
|
||||
* Find orders fetching its id, shipDate and status properties. Note that the id
|
||||
* property is always fetched even if it is not included in the list of fetch
|
||||
* properties.
|
||||
* </p>
|
||||
* <pre>{@code
|
||||
* find order (shipDate, status)
|
||||
*
|
||||
* select (shipDate, status)
|
||||
*
|
||||
* }</pre>
|
||||
* <p>
|
||||
* Find orders with a named bind variable (that will need to be bound via
|
||||
* {@link Query#setParameter(String, Object)}).
|
||||
* </p>
|
||||
* <pre>{@code
|
||||
* find order
|
||||
*
|
||||
* where customer.name like :custLike
|
||||
*
|
||||
* }</pre>
|
||||
* <p>
|
||||
* Find orders and also fetch the customer with a named bind parameter. This
|
||||
* will fetch and populate both the order and customer objects.
|
||||
* </p>
|
||||
* <pre>{@code
|
||||
* find order
|
||||
*
|
||||
* fetch customer
|
||||
* where customer.id = :custId
|
||||
*
|
||||
* }</pre>
|
||||
* <p>
|
||||
* Find orders and also fetch the customer, customer shippingAddress, order
|
||||
@@ -198,57 +180,13 @@ import java.util.Set;
|
||||
* populated.
|
||||
* </p>
|
||||
* <pre>{@code
|
||||
* find order
|
||||
*
|
||||
* fetch customer (name)
|
||||
* fetch customer.shippingAddress
|
||||
* fetch details
|
||||
* fetch details.product (sku, name)
|
||||
*
|
||||
* }</pre>
|
||||
* <h3>Early parsing of the Query</h3>
|
||||
* <p>
|
||||
* When you get a Query object from a named query, the query statement has
|
||||
* already been parsed. You can then add to that query (add fetch paths, add to
|
||||
* the where clause) or override some of its settings (override the order by
|
||||
* clause, first rows, max rows).
|
||||
* </p>
|
||||
* <p>
|
||||
* The thought is that you can use named queries as a 'starting point' and then
|
||||
* modify the query to suit specific needs.
|
||||
* </p>
|
||||
* <h3>Building the Where clause</h3>
|
||||
* <p>
|
||||
* You can add to the where clause using Expression objects or a simple String.
|
||||
* Note that the ExpressionList has methods to add most of the common
|
||||
* expressions that you will need.
|
||||
* <ul>
|
||||
* <li>where(String addToWhereClause)</li>
|
||||
* <li>where().add(Expression expression)</li>
|
||||
* <li>where().eq(propertyName, value).like(propertyName , value)...</li>
|
||||
* </ul>
|
||||
* </p>
|
||||
* <p>
|
||||
* The full WHERE clause is constructed by appending together
|
||||
* <li>original query where clause (Named query or query.setQuery(String oql))</li>
|
||||
* <li>clauses added via query.where(String addToWhereClause)</li>
|
||||
* <li>clauses added by Expression objects</li>
|
||||
* </p>
|
||||
* <p>
|
||||
* The above is the order that these are clauses are appended to give the full
|
||||
* WHERE clause.
|
||||
* </p>
|
||||
* <h3>Design Goal</h3>
|
||||
* <p>
|
||||
* This query language is NOT designed to be a replacement for SQL. It is
|
||||
* designed to be a simple way to describe the "Object Graph" you want Ebean to
|
||||
* build for you. Each find/fetch represents a node in that "Object Graph" which
|
||||
* makes it easy to define for each node which properties you want to fetch.
|
||||
* </p>
|
||||
* <p>
|
||||
* Once you hit the limits of this language such as wanting aggregate functions
|
||||
* (sum, average, min etc) or recursive queries etc you use SQL. Ebean's goal is
|
||||
* to make it as easy as possible to use your own SQL to populate entity beans.
|
||||
* Refer to {@link RawSql} .
|
||||
* </p>
|
||||
*
|
||||
* @param <T> the type of Entity bean this query will fetch.
|
||||
*/
|
||||
@@ -304,7 +242,7 @@ public interface Query<T> {
|
||||
* Specify the PersistenceContextScope to use for this query.
|
||||
* <p/>
|
||||
* When this is not set the 'default' configured on {@link com.avaje.ebean.config.ServerConfig#setPersistenceContextScope(PersistenceContextScope)}
|
||||
* is used - this value defaults to {@link com.avaje.ebean.PersistenceContextScope#TRANSACTION}.
|
||||
* is used - this value defaults to {@link PersistenceContextScope#TRANSACTION}.
|
||||
* <p/>
|
||||
* Note that the same persistence Context is used for subsequent lazy loading and query join queries.
|
||||
* <p/>
|
||||
|
||||
Reference in New Issue
Block a user