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<?php |
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/** |
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* This file contains the SoqlQuery class and the respective constants and default values that belong to SoQL. |
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* |
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* @copyright 2015 Vladimir Jimenez |
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* @license https://github.com/allejo/PhpSoda/blob/master/LICENSE.md MIT |
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*/ |
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namespace allejo\Socrata; |
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/** |
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* An object provided for the creation and handling of SoQL queries in an object-oriented fashion. |
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* |
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* @package allejo\Socrata |
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* @since 0.1.0 |
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*/ |
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class SoqlQuery |
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{ |
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/** |
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* The default delimiter used to separate multiple values. |
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*/ |
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const DELIMITER = ','; |
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/** |
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* The SELECT clause in SoQL |
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*/ |
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const SELECT_KEY = '$select'; |
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/** |
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* The WHERE clause in SoQL |
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*/ |
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const WHERE_KEY = '$where'; |
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/** |
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* The ORDER clause in SoQL |
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*/ |
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const ORDER_KEY = '$order'; |
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/** |
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* The GROUP clause in SoQL |
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*/ |
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const GROUP_KEY = '$group'; |
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/** |
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* The LIMIT clause in SoQL |
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*/ |
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const LIMIT_KEY = '$limit'; |
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/** |
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* The HAVING clause in SoQL |
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*/ |
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const HAVING_KEY = '$having'; |
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/** |
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* The OFFSET clause in SoQL |
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*/ |
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const OFFSET_KEY = '$offset'; |
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/** |
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* The SEARCH clause in SoQL |
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*/ |
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const SEARCH_KEY = '$q'; |
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/** |
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* The default value for the `$select` clause in a SoQL query. By default, select all the columns |
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*/ |
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const DEFAULT_SELECT = '*'; |
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/** |
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* The default order for the `$order` clause in a SoQL query. By default, order in ascending order |
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*/ |
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const DEFAULT_ORDER_DIRECTION = SoqlOrderDirection::ASC; |
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/** |
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* This array contains all of the parts to a SoqlQuery being converted into a URL where the key of an element is the |
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* SoQL clause (e.g. $select) and the value of an element is the value to the SoQL clause (e.g. *). |
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* |
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* @var string[] |
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*/ |
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private $queryElements; |
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/** |
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* Write a SoQL query by chaining functions. This object will handle encoding the final query in order for it to be |
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* used properly as a URL. By default a SoqlQuery will select all columns (excluding socrata columns; e.g. :id) and |
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* sort by `:id` in ascending order. |
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* |
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* @since 0.1.0 |
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*/ |
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public function __construct () {} |
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/** |
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* Convert the current information into a URL encoded query that can be appended to the domain |
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* |
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* @since 0.1.0 |
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* |
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* @return string The SoQL query ready to be appended to a URL |
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*/ |
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public function __tostring () |
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{ |
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if (is_null($this->queryElements)) |
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{ |
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return ""; |
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} |
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$query = []; |
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foreach ($this->queryElements as $soqlKey => $value) |
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{ |
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$value = (is_array($value)) ? implode(self::DELIMITER, $value) : $value; |
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$query[] = sprintf("%s=%s", $soqlKey, $value); |
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} |
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return implode("&", $query); |
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} |
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/** |
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* Select only specific columns in your Soql Query. When this function is given no parameters or is not used in a |
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* query, the Soql Query will return all of the columns by default. |
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* |
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* ```php |
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* // These are all valid usages |
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* $soqlQuery->select(); |
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* $soqlQuery->select("foo", "bar", "baz"); |
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* $soqlQuery->select(array("foo" => "foo_alias", "bar" => "bar_alias", "baz")); |
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* ``` |
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* |
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* @link https://dev.socrata.com/docs/queries/select.html SoQL $select Parameter |
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* |
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* @param array|mixed $columns The columns to select from the dataset. The columns can be specified as an array |
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* of values or it can be specified as multiple parameters separated by commas. |
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* |
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* @since 0.1.0 |
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* |
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* @return $this A SoqlQuery object that can continue to be chained |
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*/ |
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public function select ($columns = self::DEFAULT_SELECT) |
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{ |
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if (func_num_args() == 1) |
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{ |
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$this->queryElements[self::SELECT_KEY] = (is_array($columns)) ? $this->formatAssociativeArray("%s AS %s", $columns) : array($columns); |
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} |
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else if (func_num_args() > 1) |
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{ |
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$this->queryElements[self::SELECT_KEY] = func_get_args(); |
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} |
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return $this; |
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} |
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/** |
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* Create an array of values that have already been formatted and are ready to be converted into a comma separated |
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* list that will be used as a parameter for selectors such was `$select`, `$order`, or `$group` in SoQL |
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* |
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* @param string $format The format used in sprintf() for keys and values of an array to be formatted to |
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* @param array $array The array that will be formatted appropriately for usage within this class |
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* |
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* @since 0.1.0 |
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* |
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* @return array |
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*/ |
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private function formatAssociativeArray ($format, $array) |
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{ |
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$formattedValues = array(); |
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foreach ($array as $key => $value) |
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{ |
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if(is_string($key) && !is_null($value)) |
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{ |
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$formattedValues[] = rawurlencode(sprintf($format, trim($key), trim($value))); |
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} |
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else |
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{ |
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$formattedValues[] = is_string($key) ? $key : $value; |
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} |
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} |
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return $formattedValues; |
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} |
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/** |
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* Create a filter to selectively choose data based on certain parameters. |
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* |
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* Multiple calls to this function in a chain will overwrite the previous statement. To combine multiple where |
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* clauses, use the supported SoQL operators; e.g. `magnitude > 3.0 AND source = 'pr'` |
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* |
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* @link https://dev.socrata.com/docs/queries/where.html SoQL $where Parameter |
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* |
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* @param string $statement The `where` clause that will be used to filter data |
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* |
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* @since 0.1.0 |
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* |
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* @return $this A SoqlQuery object that can continue to be chained |
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*/ |
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public function where ($statement) |
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{ |
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$this->queryElements[self::WHERE_KEY] = rawurlencode($statement); |
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return $this; |
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} |
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/** |
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* Create a filter to aggregate your results using boolean operators, similar to the HAVING clause in SQL. |
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* |
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* @link https://dev.socrata.com/docs/queries/having.html SoQL $having Parameter |
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* |
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* @param string $statement The `having` clause that will be used to filter data |
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* |
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* @since 0.2.0 |
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* |
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* @return $this A SoqlQuery object that can continue to be chained |
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*/ |
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public function having ($statement) |
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{ |
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$this->queryElements[self::HAVING_KEY] = rawurlencode($statement); |
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return $this; |
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} |
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/** |
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* Determines the order and the column the results should be sorted by. This function may be used more than once in |
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* a chain so duplicate entries in the first column will be sorted by the second specified column specified. If |
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* this |
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* function is called more than once in a chain, the order does matter in which order() you call first. |
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* |
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* @link https://dev.socrata.com/changelog/2015/04/27/new-higher-performance-apis.html New Higher Performance API |
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* @link https://dev.socrata.com/docs/queries/order.html SoQL $order Parameter |
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* |
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* @param string $column The column(s) that determines how the results should be sorted. This information |
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* can be given as an array of values, a single column, or a comma separated string. |
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* In order to support sorting by multiple columns, you need to use the latest version |
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* of the dataset API. |
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* @param string $direction The direction the results should be sorted in, either ascending or descending. The |
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* {@link SoqlOrderDirection} class provides constants to use should these values ever |
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* change in the future. The only accepted values are: `ASC` and `DESC` |
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* |
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* @see SoqlOrderDirection View convenience constants |
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* |
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* @since 0.1.0 |
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* |
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* @return $this A SoqlQuery object that can continue to be chained |
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*/ |
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public function order ($column, $direction = self::DEFAULT_ORDER_DIRECTION) |
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{ |
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$this->queryElements[self::ORDER_KEY][] = rawurlencode($column . " " . $direction); |
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return $this; |
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} |
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/** |
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* Group the resulting dataset based on a specific column. This function must be used in conjunction with |
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* `select()`. |
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* |
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* For example, to find the strongest earthquake by region, we want to group() by region and provide a select of |
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* region, MAX(magnitude). |
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* |
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* ```php |
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* $soql->select("region", "MAX(magnitude)")->group("region"); |
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* ``` |
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* |
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* @link https://dev.socrata.com/docs/queries/group.html The $group Parameter |
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* |
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* @param string $column The column that will be used to group the dataset |
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* |
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* @since 0.1.0 |
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* |
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* @return $this A SoqlQuery object that can continue to be chained |
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*/ |
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public function group ($column) |
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{ |
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$this->queryElements[self::GROUP_KEY][] = $column; |
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return $this; |
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} |
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/** |
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* Set the amount of results that can be retrieved from a dataset per query. |
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* |
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* @link https://dev.socrata.com/docs/queries/limit.html SoQL $limit Parameter |
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* |
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* @param int $limit The number of results the dataset should be limited to when returned |
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* |
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* @throws \InvalidArgumentException If the given argument is not an integer |
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* @throws \OutOfBoundsException If the given argument is less than 0 |
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* |
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* @since 0.1.0 |
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* |
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* @return $this A SoqlQuery object that can continue to be chained |
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*/ |
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public function limit ($limit) |
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{ |
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$this->handleInteger("limit", $limit); |
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$this->queryElements[self::LIMIT_KEY] = $limit; |
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return $this; |
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} |
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/** |
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* Analyze a given value and ensure the value fits the criteria set by the Socrata API |
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* |
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* @param string $variable The literal name of this field |
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* @param int $number The value to analyze |
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* |
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* @since 0.1.0 |
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* |
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* @throws \InvalidArgumentException If the given argument is not an integer |
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* @throws \OutOfBoundsException If the given argument is less than 0 |
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*/ |
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private function handleInteger ($variable, $number) |
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{ |
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if (!is_integer($number)) |
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{ |
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throw new \InvalidArgumentException(sprintf("The %s must be an integer", $variable)); |
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} |
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if ($number < 0) |
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{ |
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$message = sprintf("The %s cannot be less than 0.", $variable); |
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throw new \OutOfBoundsException($message, 1); |
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} |
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} |
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/** |
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* The offset is the number of records into a dataset that you want to start, indexed at 0. For example, to retrieve |
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* the “4th page” of records (records 151 - 200) where you are using limit() to page 50 records at a time, you’d ask |
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* for an $offset of 150. |
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* |
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* @link https://dev.socrata.com/docs/queries/offset.html SoQL $offset Parameter |
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* |
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* @param int $offset The number of results the dataset should be offset to when returned |
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* |
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* @throws \InvalidArgumentException If the given argument is not an integer |
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* @throws \OutOfBoundsException If the given argument is less than 0 |
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* |
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* @since 0.1.0 |
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* |
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* @return $this A SoqlQuery object that can continue to be chained |
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*/ |
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public function offset ($offset) |
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{ |
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$this->handleInteger("offset", $offset); |
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$this->queryElements[self::OFFSET_KEY] = $offset; |
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return $this; |
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} |
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/** |
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* Search the entire dataset for a specified string. Think of this as a search engine instead of performing a SQL |
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* query. |
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* |
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* @param string $needle The phrase to search for |
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* |
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* @since 0.1.0 |
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* |
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* @return $this A SoqlQuery object that can continue to be chained |
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*/ |
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public function fullTextSearch ($needle) |
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{ |
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$this->queryElements[self::SEARCH_KEY] = rawurlencode($needle); |
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return $this; |
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} |
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} |
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