Trait SqlDialectTrait
Sql dialect trait
Method Summary
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_deleteQueryTranslator() protected
Apply translation steps to delete queries.
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_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.
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_insertQueryTranslator() protected
Apply translation steps to insert queries.
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_removeAliasesFromConditions() protected
Removes aliases from the
WHEREclause of a query. -
_selectQueryTranslator() protected
Apply translation steps to select queries.
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_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
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_updateQueryTranslator() protected
Apply translation steps to update queries.
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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.
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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
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releaseSavePointSQL() public
Returns a SQL snippet for releasing a previously created save point
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rollbackSavePointSQL() public
Returns a SQL snippet for rollbacking a previously created save point
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savePointSQL() public
Returns a SQL snippet for creating a new transaction savepoint
Method Detail
_deleteQueryTranslator() ¶ protected
_deleteQueryTranslator(Cake\Database\Query $query): Cake\Database\QueryApply translation steps to delete queries.
Chops out aliases on delete query conditions as most database dialects do not support aliases in delete queries. This also removes aliases in table names as they frequently don't work either.
We are intentionally not supporting deletes with joins as they have even poorer support.
Parameters
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Cake\Database\Query$query The query to translate
Returns
Cake\Database\Query_expressionTranslators() ¶ protected
_expressionTranslators(): arrayReturns 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
array_insertQueryTranslator() ¶ protected
_insertQueryTranslator(Cake\Database\Query $query): Cake\Database\QueryApply translation steps to insert queries.
Parameters
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Cake\Database\Query$query The query to translate
Returns
Cake\Database\Query_removeAliasesFromConditions() ¶ protected
_removeAliasesFromConditions(Cake\Database\Query $query): Cake\Database\QueryRemoves aliases from the WHERE clause of a query.
Parameters
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Cake\Database\Query$query The query to process.
Returns
Cake\Database\QueryThrows
RuntimeExceptionIn 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 $query): Cake\Database\QueryApply translation steps to select queries.
Parameters
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Cake\Database\Query$query The query to translate
Returns
Cake\Database\Query_transformDistinct() ¶ protected
_transformDistinct(Cake\Database\Query $query): Cake\Database\QueryReturns the passed query after rewriting the DISTINCT clause, so that drivers that do not support the "ON" part can provide the actual way it should be done
Parameters
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Cake\Database\Query$query The query to be transformed
Returns
Cake\Database\Query_updateQueryTranslator() ¶ protected
_updateQueryTranslator(Cake\Database\Query $query): Cake\Database\QueryApply translation steps to update queries.
Chops out aliases on update query conditions as not all database dialects do support aliases in update queries.
Just like for delete queries, joins are currently not supported for update queries.
Parameters
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Cake\Database\Query$query The query to translate
Returns
Cake\Database\QueryqueryTranslator() ¶ public
queryTranslator(string $type): callableReturns a callable function that will be used to transform a passed Query object. This function, in turn, will return an instance of a Query object that has been transformed to accommodate any specificities of the SQL dialect in use.
Parameters
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string$type the type of query to be transformed (select, insert, update, delete)
Returns
callablequoteIdentifier() ¶ public
quoteIdentifier(string $identifier): stringQuotes a database identifier (a column name, table name, etc..) to be used safely in queries without the risk of using reserved words
Parameters
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string$identifier The identifier to quote.
Returns
stringreleaseSavePointSQL() ¶ public
releaseSavePointSQL(string $name): stringReturns a SQL snippet for releasing a previously created save point
Parameters
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string$name save point name
Returns
stringrollbackSavePointSQL() ¶ public
rollbackSavePointSQL(string $name): stringReturns a SQL snippet for rollbacking a previously created save point
Parameters
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string$name save point name
Returns
stringsavePointSQL() ¶ public
savePointSQL(string $name): stringReturns a SQL snippet for creating a new transaction savepoint
Parameters
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string$name save point name
Returns
string