select('id, name') * ->from('tbl_user') * ->limit(10); * // build and execute the query * $command = $query->createCommand(); * // $command->sql returns the actual SQL * $rows = $command->queryAll(); * ~~~ * * @author Qiang Xue * @author Carsten Brandt * @since 2.0 */ class Query extends Component implements QueryInterface { use QueryTrait; /** * @var array the columns being selected. For example, `['id', 'name']`. * This is used to construct the SELECT clause in a SQL statement. If not set, it means selecting all columns. * @see select() */ public $select; /** * @var string additional option that should be appended to the 'SELECT' keyword. For example, * in MySQL, the option 'SQL_CALC_FOUND_ROWS' can be used. */ public $selectOption; /** * @var boolean whether to select distinct rows of data only. If this is set true, * the SELECT clause would be changed to SELECT DISTINCT. */ public $distinct; /** * @var array the table(s) to be selected from. For example, `['tbl_user', 'tbl_post']`. * This is used to construct the FROM clause in a SQL statement. * @see from() */ public $from; /** * @var array how to group the query results. For example, `['company', 'department']`. * This is used to construct the GROUP BY clause in a SQL statement. */ public $groupBy; /** * @var array how to join with other tables. Each array element represents the specification * of one join which has the following structure: * * ~~~ * [$joinType, $tableName, $joinCondition] * ~~~ * * For example, * * ~~~ * [ * ['INNER JOIN', 'tbl_user', 'tbl_user.id = author_id'], * ['LEFT JOIN', 'tbl_team', 'tbl_team.id = team_id'], * ] * ~~~ */ public $join; /** * @var string|array the condition to be applied in the GROUP BY clause. * It can be either a string or an array. Please refer to [[where()]] on how to specify the condition. */ public $having; /** * @var array this is used to construct the UNION clause(s) in a SQL statement. * Each array element can be either a string or a [[Query]] object representing a sub-query. */ public $union; /** * @var array list of query parameter values indexed by parameter placeholders. * For example, `[':name' => 'Dan', ':age' => 31]`. */ public $params; /** * Creates a DB command that can be used to execute this query. * @param Connection $db the database connection used to generate the SQL statement. * If this parameter is not given, the `db` application component will be used. * @return Command the created DB command instance. */ public function createCommand($db = null) { if ($db === null) { $db = Yii::$app->getDb(); } list ($sql, $params) = $db->getQueryBuilder()->build($this); return $db->createCommand($sql, $params); } /** * Executes the query and returns all results as an array. * @param Connection $db the database connection used to generate the SQL statement. * If this parameter is not given, the `db` application component will be used. * @return array the query results. If the query results in nothing, an empty array will be returned. */ public function all($db = null) { $rows = $this->createCommand($db)->queryAll(); if ($this->indexBy === null) { return $rows; } $result = []; foreach ($rows as $row) { if (is_string($this->indexBy)) { $key = $row[$this->indexBy]; } else { $key = call_user_func($this->indexBy, $row); } $result[$key] = $row; } return $result; } /** * Executes the query and returns a single row of result. * @param Connection $db the database connection used to generate the SQL statement. * If this parameter is not given, the `db` application component will be used. * @return array|boolean the first row (in terms of an array) of the query result. False is returned if the query * results in nothing. */ public function one($db = null) { return $this->createCommand($db)->queryOne(); } /** * Returns the query result as a scalar value. * The value returned will be the first column in the first row of the query results. * @param Connection $db the database connection used to generate the SQL statement. * If this parameter is not given, the `db` application component will be used. * @return string|boolean the value of the first column in the first row of the query result. * False is returned if the query result is empty. */ public function scalar($db = null) { return $this->createCommand($db)->queryScalar(); } /** * Executes the query and returns the first column of the result. * @param Connection $db the database connection used to generate the SQL statement. * If this parameter is not given, the `db` application component will be used. * @return array the first column of the query result. An empty array is returned if the query results in nothing. */ public function column($db = null) { return $this->createCommand($db)->queryColumn(); } /** * Returns the number of records. * @param string $q the COUNT expression. Defaults to '*'. * Make sure you properly quote column names in the expression. * @param Connection $db the database connection used to generate the SQL statement. * If this parameter is not given (or null), the `db` application component will be used. * @return integer number of records */ public function count($q = '*', $db = null) { $this->select = ["COUNT($q)"]; return $this->createCommand($db)->queryScalar(); } /** * Returns the sum of the specified column values. * @param string $q the column name or expression. * Make sure you properly quote column names in the expression. * @param Connection $db the database connection used to generate the SQL statement. * If this parameter is not given, the `db` application component will be used. * @return integer the sum of the specified column values */ public function sum($q, $db = null) { $this->select = ["SUM($q)"]; return $this->createCommand($db)->queryScalar(); } /** * Returns the average of the specified column values. * @param string $q the column name or expression. * Make sure you properly quote column names in the expression. * @param Connection $db the database connection used to generate the SQL statement. * If this parameter is not given, the `db` application component will be used. * @return integer the average of the specified column values. */ public function average($q, $db = null) { $this->select = ["AVG($q)"]; return $this->createCommand($db)->queryScalar(); } /** * Returns the minimum of the specified column values. * @param string $q the column name or expression. * Make sure you properly quote column names in the expression. * @param Connection $db the database connection used to generate the SQL statement. * If this parameter is not given, the `db` application component will be used. * @return integer the minimum of the specified column values. */ public function min($q, $db = null) { $this->select = ["MIN($q)"]; return $this->createCommand($db)->queryScalar(); } /** * Returns the maximum of the specified column values. * @param string $q the column name or expression. * Make sure you properly quote column names in the expression. * @param Connection $db the database connection used to generate the SQL statement. * If this parameter is not given, the `db` application component will be used. * @return integer the maximum of the specified column values. */ public function max($q, $db = null) { $this->select = ["MAX($q)"]; return $this->createCommand($db)->queryScalar(); } /** * Returns a value indicating whether the query result contains any row of data. * @param Connection $db the database connection used to generate the SQL statement. * If this parameter is not given, the `db` application component will be used. * @return boolean whether the query result contains any row of data. */ public function exists($db = null) { $this->select = [new Expression('1')]; return $this->scalar($db) !== false; } /** * Sets the SELECT part of the query. * @param string|array $columns the columns to be selected. * Columns can be specified in either a string (e.g. "id, name") or an array (e.g. ['id', 'name']). * Columns can contain table prefixes (e.g. "tbl_user.id") and/or column aliases (e.g. "tbl_user.id AS user_id"). * The method will automatically quote the column names unless a column contains some parenthesis * (which means the column contains a DB expression). * @param string $option additional option that should be appended to the 'SELECT' keyword. For example, * in MySQL, the option 'SQL_CALC_FOUND_ROWS' can be used. * @return static the query object itself */ public function select($columns, $option = null) { if (!is_array($columns)) { $columns = preg_split('/\s*,\s*/', trim($columns), -1, PREG_SPLIT_NO_EMPTY); } $this->select = $columns; $this->selectOption = $option; return $this; } /** * Sets the value indicating whether to SELECT DISTINCT or not. * @param bool $value whether to SELECT DISTINCT or not. * @return static the query object itself */ public function distinct($value = true) { $this->distinct = $value; return $this; } /** * Sets the FROM part of the query. * @param string|array $tables the table(s) to be selected from. This can be either a string (e.g. `'tbl_user'`) * or an array (e.g. `['tbl_user', 'tbl_profile']`) specifying one or several table names. * Table names can contain schema prefixes (e.g. `'public.tbl_user'`) and/or table aliases (e.g. `'tbl_user u'`). * The method will automatically quote the table names unless it contains some parenthesis * (which means the table is given as a sub-query or DB expression). * @return static the query object itself */ public function from($tables) { if (!is_array($tables)) { $tables = preg_split('/\s*,\s*/', trim($tables), -1, PREG_SPLIT_NO_EMPTY); } $this->from = $tables; return $this; } /** * Sets the WHERE part of the query. * * The method requires a $condition parameter, and optionally a $params parameter * specifying the values to be bound to the query. * * The $condition parameter should be either a string (e.g. 'id=1') or an array. * If the latter, it must be in one of the following two formats: * * - hash format: `['column1' => value1, 'column2' => value2, ...]` * - operator format: `[operator, operand1, operand2, ...]` * * A condition in hash format represents the following SQL expression in general: * `column1=value1 AND column2=value2 AND ...`. In case when a value is an array, * an `IN` expression will be generated. And if a value is null, `IS NULL` will be used * in the generated expression. Below are some examples: * * - `['type' => 1, 'status' => 2]` generates `(type = 1) AND (status = 2)`. * - `['id' => [1, 2, 3], 'status' => 2]` generates `(id IN (1, 2, 3)) AND (status = 2)`. * - `['status' => null] generates `status IS NULL`. * * A condition in operator format generates the SQL expression according to the specified operator, which * can be one of the followings: * * - `and`: the operands should be concatenated together using `AND`. For example, * `['and', 'id=1', 'id=2']` will generate `id=1 AND id=2`. If an operand is an array, * it will be converted into a string using the rules described here. For example, * `['and', 'type=1', ['or', 'id=1', 'id=2']]` will generate `type=1 AND (id=1 OR id=2)`. * The method will NOT do any quoting or escaping. * * - `or`: similar to the `and` operator except that the operands are concatenated using `OR`. * * - `between`: operand 1 should be the column name, and operand 2 and 3 should be the * starting and ending values of the range that the column is in. * For example, `['between', 'id', 1, 10]` will generate `id BETWEEN 1 AND 10`. * * - `not between`: similar to `between` except the `BETWEEN` is replaced with `NOT BETWEEN` * in the generated condition. * * - `in`: operand 1 should be a column or DB expression, and operand 2 be an array representing * the range of the values that the column or DB expression should be in. For example, * `['in', 'id', [1, 2, 3]]` will generate `id IN (1, 2, 3)`. * The method will properly quote the column name and escape values in the range. * * - `not in`: similar to the `in` operator except that `IN` is replaced with `NOT IN` in the generated condition. * * - `like`: operand 1 should be a column or DB expression, and operand 2 be a string or an array representing * the values that the column or DB expression should be like. * For example, `['like', 'name', '%tester%']` will generate `name LIKE '%tester%'`. * When the value range is given as an array, multiple `LIKE` predicates will be generated and concatenated * using `AND`. For example, `['like', 'name', ['%test%', '%sample%']]` will generate * `name LIKE '%test%' AND name LIKE '%sample%'`. * The method will properly quote the column name and escape values in the range. * * - `or like`: similar to the `like` operator except that `OR` is used to concatenate the `LIKE` * predicates when operand 2 is an array. * * - `not like`: similar to the `like` operator except that `LIKE` is replaced with `NOT LIKE` * in the generated condition. * * - `or not like`: similar to the `not like` operator except that `OR` is used to concatenate * the `NOT LIKE` predicates. * * @param string|array $condition the conditions that should be put in the WHERE part. * @param array $params the parameters (name => value) to be bound to the query. * @return static the query object itself * @see andWhere() * @see orWhere() */ public function where($condition, $params = []) { $this->where = $condition; $this->addParams($params); return $this; } /** * Adds an additional WHERE condition to the existing one. * The new condition and the existing one will be joined using the 'AND' operator. * @param string|array $condition the new WHERE condition. Please refer to [[where()]] * on how to specify this parameter. * @param array $params the parameters (name => value) to be bound to the query. * @return static the query object itself * @see where() * @see orWhere() */ public function andWhere($condition, $params = []) { if ($this->where === null) { $this->where = $condition; } else { $this->where = ['and', $this->where, $condition]; } $this->addParams($params); return $this; } /** * Adds an additional WHERE condition to the existing one. * The new condition and the existing one will be joined using the 'OR' operator. * @param string|array $condition the new WHERE condition. Please refer to [[where()]] * on how to specify this parameter. * @param array $params the parameters (name => value) to be bound to the query. * @return static the query object itself * @see where() * @see andWhere() */ public function orWhere($condition, $params = []) { if ($this->where === null) { $this->where = $condition; } else { $this->where = ['or', $this->where, $condition]; } $this->addParams($params); return $this; } /** * Appends a JOIN part to the query. * The first parameter specifies what type of join it is. * @param string $type the type of join, such as INNER JOIN, LEFT JOIN. * @param string $table the table to be joined. * Table name can contain schema prefix (e.g. 'public.tbl_user') and/or table alias (e.g. 'tbl_user u'). * The method will automatically quote the table name unless it contains some parenthesis * (which means the table is given as a sub-query or DB expression). * @param string|array $on the join condition that should appear in the ON part. * Please refer to [[where()]] on how to specify this parameter. * @param array $params the parameters (name => value) to be bound to the query. * @return Query the query object itself */ public function join($type, $table, $on = '', $params = []) { $this->join[] = [$type, $table, $on]; return $this->addParams($params); } /** * Appends an INNER JOIN part to the query. * @param string $table the table to be joined. * Table name can contain schema prefix (e.g. 'public.tbl_user') and/or table alias (e.g. 'tbl_user u'). * The method will automatically quote the table name unless it contains some parenthesis * (which means the table is given as a sub-query or DB expression). * @param string|array $on the join condition that should appear in the ON part. * Please refer to [[where()]] on how to specify this parameter. * @param array $params the parameters (name => value) to be bound to the query. * @return Query the query object itself */ public function innerJoin($table, $on = '', $params = []) { $this->join[] = ['INNER JOIN', $table, $on]; return $this->addParams($params); } /** * Appends a LEFT OUTER JOIN part to the query. * @param string $table the table to be joined. * Table name can contain schema prefix (e.g. 'public.tbl_user') and/or table alias (e.g. 'tbl_user u'). * The method will automatically quote the table name unless it contains some parenthesis * (which means the table is given as a sub-query or DB expression). * @param string|array $on the join condition that should appear in the ON part. * Please refer to [[where()]] on how to specify this parameter. * @param array $params the parameters (name => value) to be bound to the query * @return Query the query object itself */ public function leftJoin($table, $on = '', $params = []) { $this->join[] = ['LEFT JOIN', $table, $on]; return $this->addParams($params); } /** * Appends a RIGHT OUTER JOIN part to the query. * @param string $table the table to be joined. * Table name can contain schema prefix (e.g. 'public.tbl_user') and/or table alias (e.g. 'tbl_user u'). * The method will automatically quote the table name unless it contains some parenthesis * (which means the table is given as a sub-query or DB expression). * @param string|array $on the join condition that should appear in the ON part. * Please refer to [[where()]] on how to specify this parameter. * @param array $params the parameters (name => value) to be bound to the query * @return Query the query object itself */ public function rightJoin($table, $on = '', $params = []) { $this->join[] = ['RIGHT JOIN', $table, $on]; return $this->addParams($params); } /** * Sets the GROUP BY part of the query. * @param string|array $columns the columns to be grouped by. * Columns can be specified in either a string (e.g. "id, name") or an array (e.g. ['id', 'name']). * The method will automatically quote the column names unless a column contains some parenthesis * (which means the column contains a DB expression). * @return static the query object itself * @see addGroupBy() */ public function groupBy($columns) { if (!is_array($columns)) { $columns = preg_split('/\s*,\s*/', trim($columns), -1, PREG_SPLIT_NO_EMPTY); } $this->groupBy = $columns; return $this; } /** * Adds additional group-by columns to the existing ones. * @param string|array $columns additional columns to be grouped by. * Columns can be specified in either a string (e.g. "id, name") or an array (e.g. ['id', 'name']). * The method will automatically quote the column names unless a column contains some parenthesis * (which means the column contains a DB expression). * @return static the query object itself * @see groupBy() */ public function addGroupBy($columns) { if (!is_array($columns)) { $columns = preg_split('/\s*,\s*/', trim($columns), -1, PREG_SPLIT_NO_EMPTY); } if ($this->groupBy === null) { $this->groupBy = $columns; } else { $this->groupBy = array_merge($this->groupBy, $columns); } return $this; } /** * Sets the HAVING part of the query. * @param string|array $condition the conditions to be put after HAVING. * Please refer to [[where()]] on how to specify this parameter. * @param array $params the parameters (name => value) to be bound to the query. * @return static the query object itself * @see andHaving() * @see orHaving() */ public function having($condition, $params = []) { $this->having = $condition; $this->addParams($params); return $this; } /** * Adds an additional HAVING condition to the existing one. * The new condition and the existing one will be joined using the 'AND' operator. * @param string|array $condition the new HAVING condition. Please refer to [[where()]] * on how to specify this parameter. * @param array $params the parameters (name => value) to be bound to the query. * @return static the query object itself * @see having() * @see orHaving() */ public function andHaving($condition, $params = []) { if ($this->having === null) { $this->having = $condition; } else { $this->having = ['and', $this->having, $condition]; } $this->addParams($params); return $this; } /** * Adds an additional HAVING condition to the existing one. * The new condition and the existing one will be joined using the 'OR' operator. * @param string|array $condition the new HAVING condition. Please refer to [[where()]] * on how to specify this parameter. * @param array $params the parameters (name => value) to be bound to the query. * @return static the query object itself * @see having() * @see andHaving() */ public function orHaving($condition, $params = []) { if ($this->having === null) { $this->having = $condition; } else { $this->having = ['or', $this->having, $condition]; } $this->addParams($params); return $this; } /** * Appends a SQL statement using UNION operator. * @param string|Query $sql the SQL statement to be appended using UNION * @return static the query object itself */ public function union($sql) { $this->union[] = $sql; return $this; } /** * Sets the parameters to be bound to the query. * @param array $params list of query parameter values indexed by parameter placeholders. * For example, `[':name' => 'Dan', ':age' => 31]`. * @return static the query object itself * @see addParams() */ public function params($params) { $this->params = $params; return $this; } /** * Adds additional parameters to be bound to the query. * @param array $params list of query parameter values indexed by parameter placeholders. * For example, `[':name' => 'Dan', ':age' => 31]`. * @return static the query object itself * @see params() */ public function addParams($params) { if (!empty($params)) { if ($this->params === null) { $this->params = $params; } else { foreach ($params as $name => $value) { if (is_integer($name)) { $this->params[] = $value; } else { $this->params[$name] = $value; } } } } return $this; } }