Trait SqlDialectTrait
Sql dialect trait
Method Summary
-
_deleteQueryTranslator() protected
Apply translation steps to delete queries. -
_expressionTranslators() protected
Returns an associative array of methods that will transform Expression objects to conform with the specific SQL dialect. Keys are class names and values a method in this class.
-
_insertQueryTranslator() protected
Apply translation steps to insert queries. -
_removeAliasesFromConditions() protected
Removes aliases from theWHEREclause of a query. -
_selectQueryTranslator() protected
Apply translation steps to select queries. -
_transformDistinct() protected
Returns the passed query after rewriting the DISTINCT clause, so that drivers that do not support the "ON" part can provide the actual way it should be done
-
_updateQueryTranslator() protected
Apply translation steps to update queries. -
queryTranslator() public
Returns a callable function that will be used to transform a passed Query object. This function, in turn, will return an instance of a Query object that has been transformed to accommodate any specificities of the SQL dialect in use.
-
quoteIdentifier() public
Quotes a database identifier (a column name, table name, etc..) to be used safely in queries without the risk of using reserved words
-
releaseSavePointSQL() public
Returns a SQL snippet for releasing a previously created save point -
rollbackSavePointSQL() public
Returns a SQL snippet for rollbacking a previously created save point -
savePointSQL() public
Returns a SQL snippet for creating a new transaction savepoint
Method Detail
_deleteQueryTranslator() protected ¶
_deleteQueryTranslator( Cake\Database\Query $query )
Apply translation steps to delete queries.
Chops out aliases on delete query conditions as most database dialects do not support aliases in delete queries. This also removes aliases in table names as they frequently don't work either.
We are intentionally not supporting deletes with joins as they have even poorer support.
Parameters
-
Cake\Database\Query$query - The query to translate
Returns
_expressionTranslators() protected ¶
_expressionTranslators( )
Returns an associative array of methods that will transform Expression objects to conform with the specific SQL dialect. Keys are class names and values a method in this class.
Returns
_insertQueryTranslator() protected ¶
_insertQueryTranslator( Cake\Database\Query $query )
Apply translation steps to insert queries.
Parameters
-
Cake\Database\Query$query - The query to translate
Returns
_removeAliasesFromConditions() protected ¶
_removeAliasesFromConditions( Cake\Database\Query $query )
Removes aliases from the WHERE clause of a query.
Parameters
-
Cake\Database\Query$query - The query to process.
Returns
Throws
In case the processed query contains any joins, as removing aliases from the conditions can break references to the joined tables.
_selectQueryTranslator() protected ¶
_selectQueryTranslator( Cake\Database\Query $query )
Apply translation steps to select queries.
Parameters
-
Cake\Database\Query$query - The query to translate
Returns
_transformDistinct() protected ¶
_transformDistinct( Cake\Database\Query $query )
Returns the passed query after rewriting the DISTINCT clause, so that drivers that do not support the "ON" part can provide the actual way it should be done
Parameters
-
Cake\Database\Query$query - The query to be transformed
Returns
_updateQueryTranslator() protected ¶
_updateQueryTranslator( Cake\Database\Query $query )
Apply translation steps to update queries.
Chops out aliases on update query conditions as not all database dialects do support aliases in update queries.
Just like for delete queries, joins are currently not supported for update queries.
Parameters
-
Cake\Database\Query$query - The query to translate
Returns
queryTranslator() public ¶
queryTranslator( string $type )
Returns a callable function that will be used to transform a passed Query object. This function, in turn, will return an instance of a Query object that has been transformed to accommodate any specificities of the SQL dialect in use.
Parameters
- string $type
the type of query to be transformed (select, insert, update, delete)
Returns
quoteIdentifier() public ¶
quoteIdentifier( string $identifier )
Quotes a database identifier (a column name, table name, etc..) to be used safely in queries without the risk of using reserved words
Parameters
- string $identifier
- The identifier to quote.
Returns
releaseSavePointSQL() public ¶
releaseSavePointSQL( string $name )
Returns a SQL snippet for releasing a previously created save point
Parameters
- string $name
- save point name
Returns
rollbackSavePointSQL() public ¶
rollbackSavePointSQL( string $name )
Returns a SQL snippet for rollbacking a previously created save point
Parameters
- string $name
- save point name
Returns
savePointSQL() public ¶
savePointSQL( string $name )
Returns a SQL snippet for creating a new transaction savepoint
Parameters
- string $name
- save point name