add definition of sequence emulated identity column platforms

lib/Doctrine/DBAL/Platforms/AbstractPlatform.php

@@ -2618,6 +2618,37 @@ abstract class AbstractPlatform
         return false;
     }
 
+    /**
+     * Whether the platform emulates identity columns through sequences.
+     *
+     * Some platforms that do not support identity columns natively
+     * but support sequences can emulate identity columns by using
+     * sequences.
+     *
+     * @return boolean
+     */
+    public function usesSequenceEmulatedIdentityColumns()
+    {
+        return false;
+    }
+
+    /**
+     * Returns the name of the sequence for a particular identity column in a particular table.
+     *
+     * @param string $tableName  The name of the table to return the sequence name for.
+     * @param string $columnName The name of the identity column in the table to return the sequence name for.
+     *
+     * @return string
+     *
+     * @throws \Doctrine\DBAL\DBALException If not supported on this platform.
+     *
+     * @see    usesSequenceEmulatedIdentityColumns
+     */
+    public function getIdentitySequenceName($tableName, $columnName)
+    {
+        throw DBALException::notSupported(__METHOD__);
+    }
+
     /**
      * Whether the platform supports indexes.
      *

lib/Doctrine/DBAL/Platforms/OraclePlatform.php

@@ -448,7 +448,7 @@ BEGIN
   END IF;
 END;';
 
-        $sequenceName = $table . '_' . $name . '_SEQ';
+        $sequenceName = $this->getIdentitySequenceName($table, $name);
         $sequence = new Sequence($sequenceName, $start);
         $sql[] = $this->getCreateSequenceSQL($sequence);
 
@@ -695,6 +695,22 @@ LEFT JOIN user_cons_columns r_cols
         return true;
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function usesSequenceEmulatedIdentityColumns()
+    {
+        return true;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getIdentitySequenceName($tableName, $columnName)
+    {
+        return $tableName . '_' . $columnName . '_SEQ';
+    }
+
     /**
      * {@inheritDoc}
      */

lib/Doctrine/DBAL/Platforms/PostgreSqlPlatform.php

@@ -113,7 +113,7 @@ class PostgreSqlPlatform extends AbstractPlatform
      */
     public function getDateSubHourExpression($date, $hours)
     {
-        return "(" . $date ." - (" . $hours . " || ' hour')::interval)";    
+        return "(" . $date ." - (" . $hours . " || ' hour')::interval)";
     }
 
     /**
@@ -180,6 +180,22 @@ class PostgreSqlPlatform extends AbstractPlatform
         return true;
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function usesSequenceEmulatedIdentityColumns()
+    {
+        return true;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getIdentitySequenceName($tableName, $columnName)
+    {
+        return $tableName . '_' . $columnName . '_seq';
+    }
+
     /**
      * {@inheritDoc}
      */
@@ -466,7 +482,7 @@ class PostgreSqlPlatform extends AbstractPlatform
             if ($columnDiff->hasChanged('autoincrement')) {
                 if ($column->getAutoincrement()) {
                     // add autoincrement
-                    $seqName = $diff->name . '_' . $oldColumnName . '_seq';
+                    $seqName = $this->getIdentitySequenceName($diff->name, $oldColumnName);
 
                     $sql[] = "CREATE SEQUENCE " . $seqName;
                     $sql[] = "SELECT setval('" . $seqName . "', (SELECT MAX(" . $oldColumnName . ") FROM " . $diff->getName()->getQuotedName($this) . "))";

tests/Doctrine/Tests/DBAL/Platforms/AbstractPlatformTestCase.php

@@ -510,4 +510,21 @@ abstract class AbstractPlatformTestCase extends \Doctrine\Tests\DbalTestCase
     {
         $this->_platform->schemaNeedsCreation('schema');
     }
+
+    /**
+     * @group DBAL-563
+     */
+    public function testUsesSequenceEmulatedIdentityColumns()
+    {
+        $this->assertFalse($this->_platform->usesSequenceEmulatedIdentityColumns());
+    }
+
+    /**
+     * @group DBAL-563
+     * @expectedException \Doctrine\DBAL\DBALException
+     */
+    public function testReturnsIdentitySequenceName()
+    {
+        $this->_platform->getIdentitySequenceName('mytable', 'mycolumn');
+    }
 }

tests/Doctrine/Tests/DBAL/Platforms/OraclePlatformTest.php

@@ -330,4 +330,20 @@ class OraclePlatformTest extends AbstractPlatformTestCase
 	);
         $this->assertEquals($expectedSql, $this->_platform->getAlterTableSQL($tableDiff));
     }
+
+    /**
+     * @group DBAL-563
+     */
+    public function testUsesSequenceEmulatedIdentityColumns()
+    {
+        $this->assertTrue($this->_platform->usesSequenceEmulatedIdentityColumns());
+    }
+
+    /**
+     * @group DBAL-563
+     */
+    public function testReturnsIdentitySequenceName()
+    {
+        $this->assertSame('mytable_mycolumn_SEQ', $this->_platform->getIdentitySequenceName('mytable', 'mycolumn'));
+    }
 }

tests/Doctrine/Tests/DBAL/Platforms/PostgreSqlPlatformTest.php

@@ -410,4 +410,20 @@ class PostgreSqlPlatformTest extends AbstractPlatformTestCase
 
         $this->assertEquals($expectedSql, $sql);
     }
+
+    /**
+     * @group DBAL-563
+     */
+    public function testUsesSequenceEmulatedIdentityColumns()
+    {
+        $this->assertTrue($this->_platform->usesSequenceEmulatedIdentityColumns());
+    }
+
+    /**
+     * @group DBAL-563
+     */
+    public function testReturnsIdentitySequenceName()
+    {
+        $this->assertSame('mytable_mycolumn_seq', $this->_platform->getIdentitySequenceName('mytable', 'mycolumn'));
+    }
 }