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Native SQL

With NativeQuery you can execute native SELECT SQL statements and map the results to Doctrine entities or any other result format supported by Doctrine.

In order to make this mapping possible, you need to describe to Doctrine what columns in the result map to which entity property. This description is represented by a ResultSetMapping object.

With this feature you can map arbitrary SQL code to objects, such as highly vendor-optimized SQL or stored-procedures.

Writing ResultSetMapping from scratch is complex, but there is a convenience wrapper around it called a ResultSetMappingBuilder. It can generate the mappings for you based on Entities and even generates the SELECT clause based on this information for you.

If you want to execute DELETE, UPDATE or INSERT statements the Native SQL API cannot be used and will probably throw errors. Use EntityManager#getConnection() to access the native database connection and call the executeUpdate() method for these queries.

The NativeQuery class

To create a NativeQuery you use the method EntityManager#createNativeQuery($sql, $resultSetMapping). As you can see in the signature of this method, it expects 2 ingredients: The SQL you want to execute and the ResultSetMapping that describes how the results will be mapped.

Once you obtained an instance of a NativeQuery, you can bind parameters to it with the same API that Query has and execute it.

1<?php use Doctrine\ORM\Query\ResultSetMapping; $rsm = new ResultSetMapping(); // build rsm here $query = $entityManager->createNativeQuery('SELECT id, name, discr FROM users WHERE name = ?', $rsm); $query->setParameter(1, 'romanb'); $users = $query->getResult();
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ResultSetMappingBuilder

An easy start into ResultSet mapping is the ResultSetMappingBuilder object. This has several benefits:

  • The builder takes care of automatically updating your ResultSetMapping when the fields or associations change on the metadata of an entity.
  • You can generate the required SELECT expression for a builder by converting it to a string.
  • The API is much simpler than the usual ResultSetMapping API.

One downside is that the builder API does not yet support entities with inheritance hierachies.

1<?php use Doctrine\ORM\Query\ResultSetMappingBuilder; $sql = "SELECT u.id, u.name, a.id AS address_id, a.street, a.city " . "FROM users u INNER JOIN address a ON u.address_id = a.id"; $rsm = new ResultSetMappingBuilder($entityManager); $rsm->addRootEntityFromClassMetadata('MyProject\User', 'u'); $rsm->addJoinedEntityFromClassMetadata('MyProject\Address', 'a', 'u', 'address', array('id' => 'address_id'));
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The builder extends the ResultSetMapping class and as such has all the functionality of it as well.

New in version 2.4

Starting with Doctrine ORM 2.4 you can generate the SELECT clause from a ResultSetMappingBuilder. You can either cast the builder object to (string) and the DQL aliases are used as SQL table aliases or use the generateSelectClause($tableAliases) method and pass a mapping from DQL alias (key) to SQL alias (value)

1<?php $selectClause = $builder->generateSelectClause(array( 'u' => 't1', 'g' => 't2' )); $sql = "SELECT " . $selectClause . " FROM users t1 JOIN groups t2 ON t1.group_id = t2.id";
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The ResultSetMapping

Understanding the ResultSetMapping is the key to using a NativeQuery. A Doctrine result can contain the following components:

  • Entity results. These represent root result elements.
  • Joined entity results. These represent joined entities in associations of root entity results.
  • Field results. These represent a column in the result set that maps to a field of an entity. A field result always belongs to an entity result or joined entity result.
  • Scalar results. These represent scalar values in the result set that will appear in each result row. Adding scalar results to a ResultSetMapping can also cause the overall result to become mixed (see DQL - Doctrine Query Language) if the same ResultSetMapping also contains entity results.
  • Meta results. These represent columns that contain meta-information, such as foreign keys and discriminator columns. When querying for objects (getResult()), all meta columns of root entities or joined entities must be present in the SQL query and mapped accordingly using ResultSetMapping#addMetaResult.

It might not surprise you that Doctrine uses ResultSetMapping internally when you create DQL queries. As the query gets parsed and transformed to SQL, Doctrine fills a ResultSetMapping that describes how the results should be processed by the hydration routines.

We will now look at each of the result types that can appear in a ResultSetMapping in detail.

Entity results

An entity result describes an entity type that appears as a root element in the transformed result. You add an entity result through ResultSetMapping#addEntityResult(). Let's take a look at the method signature in detail:

1<?php /** * Adds an entity result to this ResultSetMapping. * * @param string $class The class name of the entity. * @param string $alias The alias for the class. The alias must be unique among all entity * results or joined entity results within this ResultSetMapping. */ public function addEntityResult($class, $alias)
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The first parameter is the fully qualified name of the entity class. The second parameter is some arbitrary alias for this entity result that must be unique within a ResultSetMapping. You use this alias to attach field results to the entity result. It is very similar to an identification variable that you use in DQL to alias classes or relationships.

An entity result alone is not enough to form a valid ResultSetMapping. An entity result or joined entity result always needs a set of field results, which we will look at soon.

Joined entity results

A joined entity result describes an entity type that appears as a joined relationship element in the transformed result, attached to a (root) entity result. You add a joined entity result through ResultSetMapping#addJoinedEntityResult(). Let's take a look at the method signature in detail:

1<?php /** * Adds a joined entity result. * * @param string $class The class name of the joined entity. * @param string $alias The unique alias to use for the joined entity. * @param string $parentAlias The alias of the entity result that is the parent of this joined result. * @param object $relation The association field that connects the parent entity result with the joined entity result. */ public function addJoinedEntityResult($class, $alias, $parentAlias, $relation)
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The first parameter is the class name of the joined entity. The second parameter is an arbitrary alias for the joined entity that must be unique within the ResultSetMapping. You use this alias to attach field results to the entity result. The third parameter is the alias of the entity result that is the parent type of the joined relationship. The fourth and last parameter is the name of the field on the parent entity result that should contain the joined entity result.

Field results

A field result describes the mapping of a single column in a SQL result set to a field in an entity. As such, field results are inherently bound to entity results. You add a field result through ResultSetMapping#addFieldResult(). Again, let's examine the method signature in detail:

1<?php /** * Adds a field result that is part of an entity result or joined entity result. * * @param string $alias The alias of the entity result or joined entity result. * @param string $columnName The name of the column in the SQL result set. * @param string $fieldName The name of the field on the (joined) entity. */ public function addFieldResult($alias, $columnName, $fieldName)
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The first parameter is the alias of the entity result to which the field result will belong. The second parameter is the name of the column in the SQL result set. Note that this name is case sensitive, i.e. if you use a native query against Oracle it must be all uppercase. The third parameter is the name of the field on the entity result identified by $alias into which the value of the column should be set.

Scalar results

A scalar result describes the mapping of a single column in a SQL result set to a scalar value in the Doctrine result. Scalar results are typically used for aggregate values but any column in the SQL result set can be mapped as a scalar value. To add a scalar result use ResultSetMapping#addScalarResult(). The method signature in detail:

1<?php /** * Adds a scalar result mapping. * * @param string $columnName The name of the column in the SQL result set. * @param string $alias The result alias with which the scalar result should be placed in the result structure. */ public function addScalarResult($columnName, $alias)
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The first parameter is the name of the column in the SQL result set and the second parameter is the result alias under which the value of the column will be placed in the transformed Doctrine result.

Meta results

A meta result describes a single column in a SQL result set that is either a foreign key or a discriminator column. These columns are essential for Doctrine to properly construct objects out of SQL result sets. To add a column as a meta result use ResultSetMapping#addMetaResult(). The method signature in detail:

1<?php /** * Adds a meta column (foreign key or discriminator column) to the result set. * * @param string $alias * @param string $columnAlias * @param string $columnName * @param boolean $isIdentifierColumn */ public function addMetaResult($alias, $columnAlias, $columnName, $isIdentifierColumn = false)
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The first parameter is the alias of the entity result to which the meta column belongs. A meta result column (foreign key or discriminator column) always belongs to an entity result. The second parameter is the column alias/name of the column in the SQL result set and the third parameter is the column name used in the mapping. The fourth parameter should be set to true in case the primary key of the entity is the foreign key you're adding.

Discriminator Column

When joining an inheritance tree you have to give Doctrine a hint which meta-column is the discriminator column of this tree.

1<?php /** * Sets a discriminator column for an entity result or joined entity result. * The discriminator column will be used to determine the concrete class name to * instantiate. * * @param string $alias The alias of the entity result or joined entity result the discriminator * column should be used for. * @param string $discrColumn The name of the discriminator column in the SQL result set. */ public function setDiscriminatorColumn($alias, $discrColumn)
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Examples

Understanding a ResultSetMapping is probably easiest through looking at some examples.

First a basic example that describes the mapping of a single entity.

1<?php // Equivalent DQL query: "select u from User u where u.name=?1" // User owns no associations. $rsm = new ResultSetMapping; $rsm->addEntityResult('User', 'u'); $rsm->addFieldResult('u', 'id', 'id'); $rsm->addFieldResult('u', 'name', 'name'); $query = $this->_em->createNativeQuery('SELECT id, name FROM users WHERE name = ?', $rsm); $query->setParameter(1, 'romanb'); $users = $query->getResult();
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The result would look like this:

1array( [0] => User (Object) )
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Note that this would be a partial object if the entity has more fields than just id and name. In the example above the column and field names are identical but that is not necessary, of course. Also note that the query string passed to createNativeQuery is real native SQL. Doctrine does not touch this SQL in any way.

In the previous basic example, a User had no relations and the table the class is mapped to owns no foreign keys. The next example assumes User has a unidirectional or bidirectional one-to-one association to a CmsAddress, where the User is the owning side and thus owns the foreign key.

1<?php // Equivalent DQL query: "select u from User u where u.name=?1" // User owns an association to an Address but the Address is not loaded in the query. $rsm = new ResultSetMapping; $rsm->addEntityResult('User', 'u'); $rsm->addFieldResult('u', 'id', 'id'); $rsm->addFieldResult('u', 'name', 'name'); $rsm->addMetaResult('u', 'address_id', 'address_id'); $query = $this->_em->createNativeQuery('SELECT id, name, address_id FROM users WHERE name = ?', $rsm); $query->setParameter(1, 'romanb'); $users = $query->getResult();
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Foreign keys are used by Doctrine for lazy-loading purposes when querying for objects. In the previous example, each user object in the result will have a proxy (a ghost) in place of the address that contains the address_id. When the ghost proxy is accessed, it loads itself based on this key.

Consequently, associations that are fetch-joined do not require the foreign keys to be present in the SQL result set, only associations that are lazy.

1<?php // Equivalent DQL query: "select u from User u join u.address a WHERE u.name = ?1" // User owns association to an Address and the Address is loaded in the query. $rsm = new ResultSetMapping; $rsm->addEntityResult('User', 'u'); $rsm->addFieldResult('u', 'id', 'id'); $rsm->addFieldResult('u', 'name', 'name'); $rsm->addJoinedEntityResult('Address' , 'a', 'u', 'address'); $rsm->addFieldResult('a', 'address_id', 'id'); $rsm->addFieldResult('a', 'street', 'street'); $rsm->addFieldResult('a', 'city', 'city'); $sql = 'SELECT u.id, u.name, a.id AS address_id, a.street, a.city FROM users u ' . 'INNER JOIN address a ON u.address_id = a.id WHERE u.name = ?'; $query = $this->_em->createNativeQuery($sql, $rsm); $query->setParameter(1, 'romanb'); $users = $query->getResult();
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In this case the nested entity Address is registered with the ResultSetMapping#addJoinedEntityResult method, which notifies Doctrine that this entity is not hydrated at the root level, but as a joined entity somewhere inside the object graph. In this case we specify the alias 'u' as third parameter and address as fourth parameter, which means the Address is hydrated into the User::$address property.

If a fetched entity is part of a mapped hierarchy that requires a discriminator column, this column must be present in the result set as a meta column so that Doctrine can create the appropriate concrete type. This is shown in the following example where we assume that there are one or more subclasses that extend User and either Class Table Inheritance or Single Table Inheritance is used to map the hierarchy (both use a discriminator column).

1<?php // Equivalent DQL query: "select u from User u where u.name=?1" // User is a mapped base class for other classes. User owns no associations. $rsm = new ResultSetMapping; $rsm->addEntityResult('User', 'u'); $rsm->addFieldResult('u', 'id', 'id'); $rsm->addFieldResult('u', 'name', 'name'); $rsm->addMetaResult('u', 'discr', 'discr'); // discriminator column $rsm->setDiscriminatorColumn('u', 'discr'); $query = $this->_em->createNativeQuery('SELECT id, name, discr FROM users WHERE name = ?', $rsm); $query->setParameter(1, 'romanb'); $users = $query->getResult();
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Note that in the case of Class Table Inheritance, an example as above would result in partial objects if any objects in the result are actually a subtype of User. When using DQL, Doctrine automatically includes the necessary joins for this mapping strategy but with native SQL it is your responsibility.

Named Native Query

You can also map a native query using a named native query mapping.

To achieve that, you must describe the SQL resultset structure using named native query (and sql resultset mappings if is a several resultset mappings).

Like named query, a named native query can be defined at class level or in a XML or YAML file.

A resultSetMapping parameter is defined in @NamedNativeQuery, it represents the name of a defined @SqlResultSetMapping.

  • PHP
    1<?php namespace MyProject\Model; /** * @NamedNativeQueries({ * @NamedNativeQuery( * name = "fetchMultipleJoinsEntityResults", * resultSetMapping= "mappingMultipleJoinsEntityResults", * query = "SELECT u.id AS u_id, u.name AS u_name, u.status AS u_status, a.id AS a_id, a.zip AS a_zip, a.country AS a_country, COUNT(p.phonenumber) AS numphones FROM users u INNER JOIN addresses a ON u.id = a.user_id INNER JOIN phonenumbers p ON u.id = p.user_id GROUP BY u.id, u.name, u.status, u.username, a.id, a.zip, a.country ORDER BY u.username" * ), * }) * @SqlResultSetMappings({ * @SqlResultSetMapping( * name = "mappingMultipleJoinsEntityResults", * entities= { * @EntityResult( * entityClass = "__CLASS__", * fields = { * @FieldResult(name = "id", column="u_id"), * @FieldResult(name = "name", column="u_name"), * @FieldResult(name = "status", column="u_status"), * } * ), * @EntityResult( * entityClass = "Address", * fields = { * @FieldResult(name = "id", column="a_id"), * @FieldResult(name = "zip", column="a_zip"), * @FieldResult(name = "country", column="a_country"), * } * ) * }, * columns = { * @ColumnResult("numphones") * } * ) *}) */ class User { /** @Id @Column(type="integer") @GeneratedValue */ public $id; /** @Column(type="string", length=50, nullable=true) */ public $status; /** @Column(type="string", length=255, unique=true) */ public $username; /** @Column(type="string", length=255) */ public $name; /** @OneToMany(targetEntity="Phonenumber") */ public $phonenumbers; /** @OneToOne(targetEntity="Address") */ public $address; // .... }
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  • XML
    1<doctrine-mapping> <entity name="MyProject\Model\User"> <named-native-queries> <named-native-query name="fetchMultipleJoinsEntityResults" result-set-mapping="mappingMultipleJoinsEntityResults"> <query>SELECT u.id AS u_id, u.name AS u_name, u.status AS u_status, a.id AS a_id, a.zip AS a_zip, a.country AS a_country, COUNT(p.phonenumber) AS numphones FROM users u INNER JOIN addresses a ON u.id = a.user_id INNER JOIN phonenumbers p ON u.id = p.user_id GROUP BY u.id, u.name, u.status, u.username, a.id, a.zip, a.country ORDER BY u.username</query> </named-native-query> </named-native-queries> <sql-result-set-mappings> <sql-result-set-mapping name="mappingMultipleJoinsEntityResults"> <entity-result entity-class="__CLASS__"> <field-result name="id" column="u_id"/> <field-result name="name" column="u_name"/> <field-result name="status" column="u_status"/> </entity-result> <entity-result entity-class="Address"> <field-result name="id" column="a_id"/> <field-result name="zip" column="a_zip"/> <field-result name="country" column="a_country"/> </entity-result> <column-result name="numphones"/> </sql-result-set-mapping> </sql-result-set-mappings> </entity> </doctrine-mapping>
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  • YAML
    1MyProject\Model\User: type: entity namedNativeQueries: fetchMultipleJoinsEntityResults: name: fetchMultipleJoinsEntityResults resultSetMapping: mappingMultipleJoinsEntityResults query: SELECT u.id AS u_id, u.name AS u_name, u.status AS u_status, a.id AS a_id, a.zip AS a_zip, a.country AS a_country, COUNT(p.phonenumber) AS numphones FROM users u INNER JOIN addresses a ON u.id = a.user_id INNER JOIN phonenumbers p ON u.id = p.user_id GROUP BY u.id, u.name, u.status, u.username, a.id, a.zip, a.country ORDER BY u.username sqlResultSetMappings: mappingMultipleJoinsEntityResults: name: mappingMultipleJoinsEntityResults columnResult: 0: name: numphones entityResult: 0: entityClass: __CLASS__ fieldResult: 0: name: id column: u_id 1: name: name column: u_name 2: name: status column: u_status 1: entityClass: Address fieldResult: 0: name: id column: a_id 1: name: zip column: a_zip 2: name: country column: a_country
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Things to note:
  • The resultset mapping declares the entities retrieved by this native query.
  • Each field of the entity is bound to a SQL alias (or column name).
  • All fields of the entity including the ones of subclasses and the foreign key columns of related entities have to be present in the SQL query.
  • Field definitions are optional provided that they map to the same column name as the one declared on the class property.
  • __CLASS__ is an alias for the mapped class

In the above example, the fetchJoinedAddress named query use the joinMapping result set mapping. This mapping returns 2 entities, User and Address, each property is declared and associated to a column name, actually the column name retrieved by the query.

Let's now see an implicit declaration of the property / column.

  • PHP
    1<?php namespace MyProject\Model; /** * @NamedNativeQueries({ * @NamedNativeQuery( * name = "findAll", * resultSetMapping = "mappingFindAll", * query = "SELECT * FROM addresses" * ), * }) * @SqlResultSetMappings({ * @SqlResultSetMapping( * name = "mappingFindAll", * entities= { * @EntityResult( * entityClass = "Address" * ) * } * ) * }) */ class Address { /** @Id @Column(type="integer") @GeneratedValue */ public $id; /** @Column() */ public $country; /** @Column() */ public $zip; /** @Column()*/ public $city; // .... }
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  • XML
    1<doctrine-mapping> <entity name="MyProject\Model\Address"> <named-native-queries> <named-native-query name="findAll" result-set-mapping="mappingFindAll"> <query>SELECT * FROM addresses</query> </named-native-query> </named-native-queries> <sql-result-set-mappings> <sql-result-set-mapping name="mappingFindAll"> <entity-result entity-class="Address"/> </sql-result-set-mapping> </sql-result-set-mappings> </entity> </doctrine-mapping>
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  • YAML
    1MyProject\Model\Address: type: entity namedNativeQueries: findAll: resultSetMapping: mappingFindAll query: SELECT * FROM addresses sqlResultSetMappings: mappingFindAll: name: mappingFindAll entityResult: address: entityClass: Address
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In this example, we only describe the entity member of the result set mapping. The property / column mappings is done using the entity mapping values. In this case the model property is bound to the model_txt column. If the association to a related entity involve a composite primary key, a @FieldResult element should be used for each foreign key column. The @FieldResult name is composed of the property name for the relationship, followed by a dot (.), followed by the name or the field or property of the primary key.

  • PHP
    1<?php namespace MyProject\Model; /** * @NamedNativeQueries({ * @NamedNativeQuery( * name = "fetchJoinedAddress", * resultSetMapping= "mappingJoinedAddress", * query = "SELECT u.id, u.name, u.status, a.id AS a_id, a.country AS a_country, a.zip AS a_zip, a.city AS a_city FROM users u INNER JOIN addresses a ON u.id = a.user_id WHERE u.username = ?" * ), * }) * @SqlResultSetMappings({ * @SqlResultSetMapping( * name = "mappingJoinedAddress", * entities= { * @EntityResult( * entityClass = "__CLASS__", * fields = { * @FieldResult(name = "id"), * @FieldResult(name = "name"), * @FieldResult(name = "status"), * @FieldResult(name = "address.id", column = "a_id"), * @FieldResult(name = "address.zip", column = "a_zip"), * @FieldResult(name = "address.city", column = "a_city"), * @FieldResult(name = "address.country", column = "a_country"), * } * ) * } * ) * }) */ class User { /** @Id @Column(type="integer") @GeneratedValue */ public $id; /** @Column(type="string", length=50, nullable=true) */ public $status; /** @Column(type="string", length=255, unique=true) */ public $username; /** @Column(type="string", length=255) */ public $name; /** @OneToOne(targetEntity="Address") */ public $address; // .... }
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  • XML
    1<doctrine-mapping> <entity name="MyProject\Model\User"> <named-native-queries> <named-native-query name="fetchJoinedAddress" result-set-mapping="mappingJoinedAddress"> <query>SELECT u.id, u.name, u.status, a.id AS a_id, a.country AS a_country, a.zip AS a_zip, a.city AS a_city FROM users u INNER JOIN addresses a ON u.id = a.user_id WHERE u.username = ?</query> </named-native-query> </named-native-queries> <sql-result-set-mappings> <sql-result-set-mapping name="mappingJoinedAddress"> <entity-result entity-class="__CLASS__"> <field-result name="id"/> <field-result name="name"/> <field-result name="status"/> <field-result name="address.id" column="a_id"/> <field-result name="address.zip" column="a_zip"/> <field-result name="address.city" column="a_city"/> <field-result name="address.country" column="a_country"/> </entity-result> </sql-result-set-mapping> </sql-result-set-mappings> </entity> </doctrine-mapping>
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  • YAML
    1MyProject\Model\User: type: entity namedNativeQueries: fetchJoinedAddress: name: fetchJoinedAddress resultSetMapping: mappingJoinedAddress query: SELECT u.id, u.name, u.status, a.id AS a_id, a.country AS a_country, a.zip AS a_zip, a.city AS a_city FROM users u INNER JOIN addresses a ON u.id = a.user_id WHERE u.username = ? sqlResultSetMappings: mappingJoinedAddress: entityResult: 0: entityClass: __CLASS__ fieldResult: 0: name: id 1: name: name 2: name: status 3: name: address.id column: a_id 4: name: address.zip column: a_zip 5: name: address.city column: a_city 6: name: address.country column: a_country
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If you retrieve a single entity and if you use the default mapping, you can use the resultClass attribute instead of resultSetMapping:

  • PHP
    1<?php namespace MyProject\Model; /** * @NamedNativeQueries({ * @NamedNativeQuery( * name = "find-by-id", * resultClass = "Address", * query = "SELECT * FROM addresses" * ), * }) */ class Address { // .... }
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  • XML
    1<doctrine-mapping> <entity name="MyProject\Model\Address"> <named-native-queries> <named-native-query name="find-by-id" result-class="Address"> <query>SELECT * FROM addresses WHERE id = ?</query> </named-native-query> </named-native-queries> </entity> </doctrine-mapping>
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  • YAML
    1MyProject\Model\Address: type: entity namedNativeQueries: findAll: name: findAll resultClass: Address query: SELECT * FROM addresses
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In some of your native queries, you'll have to return scalar values, for example when building report queries. You can map them in the @SqlResultsetMapping through @ColumnResult. You actually can even mix, entities and scalar returns in the same native query (this is probably not that common though).

  • PHP
    1<?php namespace MyProject\Model; /** * @NamedNativeQueries({ * @NamedNativeQuery( * name = "count", * resultSetMapping= "mappingCount", * query = "SELECT COUNT(*) AS count FROM addresses" * ) * }) * @SqlResultSetMappings({ * @SqlResultSetMapping( * name = "mappingCount", * columns = { * @ColumnResult( * name = "count" * ) * } * ) * }) */ class Address { // .... }
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  • XML
    1<doctrine-mapping> <entity name="MyProject\Model\Address"> <named-native-query name="count" result-set-mapping="mappingCount"> <query>SELECT COUNT(*) AS count FROM addresses</query> </named-native-query> <sql-result-set-mappings> <sql-result-set-mapping name="mappingCount"> <column-result name="count"/> </sql-result-set-mapping> </sql-result-set-mappings> </entity> </doctrine-mapping>
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  • YAML
    1MyProject\Model\Address: type: entity namedNativeQueries: count: name: count resultSetMapping: mappingCount query: SELECT COUNT(*) AS count FROM addresses sqlResultSetMappings: mappingCount: name: mappingCount columnResult: count: name: count
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