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Implement resetSequence()

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This is an optional method in DboSource that allows datasources to
resetSequence values in tables.  This is useful for datasources like
Postgres, and makes using fixtures much easier.

Fixes #3026
This commit is contained in:
mark_story 2012-09-17 20:50:05 -04:00
parent cdfead0feb
commit 55dcb9c3b3
3 changed files with 52 additions and 0 deletions
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16
lib/Cake/Model/Datasource/Database/Postgres.php
View file

@ -291,6 +291,22 @@ class Postgres extends DboSource {
}
}
/**
* Reset a sequence based on the MAX() value of $column. Useful
* for resetting sequences after using insertMulti().
*
* @param string $table The name of the table to update.
* @param string $column The column to use when reseting the sequence value, the
* sequence name will be fetched using Postgres::getSequence();
* @return boolean success.
*/
public function resetSequence($table, $column) {
$sequence = $this->value($this->getSequence($table, $column));
$table = $this->fullTableName($table);
$this->execute("SELECT setval($sequence, (SELECT MAX(id) FROM $table))");
return true;
}
/**
* Deletes all the records in a table and drops all associated auto-increment sequences
*

14
lib/Cake/Model/Datasource/DboSource.php
View file

@ -2920,6 +2920,20 @@ class DboSource extends DataSource {
return $this->commit();
}
/**
* Reset a sequence based on the MAX() value of $column. Useful
* for resetting sequences after using insertMulti().
*
* This method should be implmented by datasources that require sequences to be used.
*
* @param string $table The name of the table to update.
* @param string $column The column to use when reseting the sequence value.
* @return boolean success.
*/
public function resetSequence($table, $column) {
}
/**
* Returns an array of the indexes in given datasource name.
*

22
lib/Cake/Test/Case/Model/Datasource/Database/PostgresTest.php
View file

@ -950,4 +950,26 @@ class PostgresTest extends CakeTestCase {
$this->assertNotEmpty($model->read(null, 1));
}
public function testResetSequence() {
$model = new Article();
$table = $this->Dbo->fullTableName($model, false);
$fields = array(
'id', 'user_id', 'title', 'body', 'published',
);
$values = array(
array(1, 1, 'test', 'first post', false),
array(2, 1, 'test 2', 'second post post', false),
);
$this->Dbo->insertMulti($table, $fields, $values);
$sequence = $this->Dbo->getSequence($table);
$result = $this->Dbo->rawQuery("SELECT nextval('$sequence')");
$original = $result->fetch(PDO::FETCH_ASSOC);
$this->assertTrue($this->Dbo->resetSequence($table, 'id'));
$result = $this->Dbo->rawQuery("SELECT currval('$sequence')");
$new = $result->fetch(PDO::FETCH_ASSOC);
$this->assertTrue($new['currval'] > $original['nextval'], 'Sequence did not update');
}
}