![]() Partition($expressions) Add one or more partitions to the window based on column Order($fields) Order the aggregate group the same as a query ORDER BY. Most features are providedīy AggregateExpresion, but make sure you follow your database documentation on use and restrictions. These are the most commonly supported window features. You can create custom aggregate functions Which lets you attach window expressions. That cake abstracts with a wrapper in FunctionsBuilder will return an AggregateExpression Window expressions can be applied to most aggregate functions. article_id ) AS latest_comment, FROM articles AS Articles INNER JOIN comments AS Comments article_id ) AS oldest_comment, MAX ( Comments. Returns an Aggregate expression for the LEAD() SQL function. Returns an Aggregate expression for the LAG() SQL function. Returns an Aggregate expression for the ROW_NUMBER() SQL function. These window-only functions contain a window expression by default: rowNumber() Returns a FunctionExpression representing a call to SQL WEEKDAY function. dateAdd()Īdd the time unit to the date expression. Returns the specified date part from the SQL expression. now()ĭefaults to returning date and time, but accepts ‘time’ or ‘date’ to return only Get the difference between two dates/times. cast()Ĭonvert a field or expression from one data type to another. Generate a random value between 0 and 1 via SQL. You can access existing wrappers for several SQL functions through Query::func(): rand() ![]() $query -> select () įor details, see the documentation for Cake\Database\FunctionsBuilder. ![]() Selecting Data ¶ĬakePHP makes building SELECT queries simple. If you want to take a look at what SQL CakePHP is generating, you can turnĭatabase query logging on. Calling the same query without modification multiple times will return same reference. Re-evaluating a query will result in additional SQL being run. It also means that if a Query hasn’t beenĮvaluated, no SQL is ever sent to the database. Until one of these conditions are met, the query can be modified without additional The query’s toList() or toArray() method is called. This will return the first result in the setīuilt by SELECT (it adds LIMIT 1 to the query). Statement object, and is to be used with insert/update/delete queries. This means a query is not executed until one Use the combine() method from the collections library // This is equivalent to find('list') $keyValueList = $articles -> find () -> all () -> combine ( 'id', 'title' ) // An advanced example $results = $articles -> find () -> where () -> order () -> all () -> map ( function ( $row ) Queries Are Lazily Evaluated ¶ ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |