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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\elasticsearch;
use yii\base\NotSupportedException;
/**
* QueryBuilder builds a SELECT SQL statement based on the specification given as a [[Query]] object.
*
* QueryBuilder can also be used to build SQL statements such as INSERT, UPDATE, DELETE, CREATE TABLE,
* from a [[Query]] object.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
class QueryBuilder extends \yii\base\Object
{
/**
* @var Connection the database connection.
*/
public $db;
/**
* Constructor.
* @param Connection $connection the database connection.
* @param array $config name-value pairs that will be used to initialize the object properties
*/
public function __construct($connection, $config = array())
{
$this->db = $connection;
parent::__construct($config);
}
/**
* Generates a SELECT SQL statement from a [[Query]] object.
* @param Query $query the [[Query]] object from which the SQL statement will be generated
* @return array the generated SQL statement (the first array element) and the corresponding
* parameters to be bound to the SQL statement (the second array element).
*/
public function build($query)
{
$searchQuery = array();
$this->buildSelect($searchQuery, $query->select);
// $this->buildFrom($searchQuery, $query->from);
$this->buildCondition($searchQuery, $query->where);
$this->buildOrderBy($searchQuery, $query->orderBy);
$this->buildLimit($searchQuery, $query->limit, $query->offset);
return $searchQuery;
}
/**
* Converts an abstract column type into a physical column type.
* The conversion is done using the type map specified in [[typeMap]].
* The following abstract column types are supported (using MySQL as an example to explain the corresponding
* physical types):
*
* - `pk`: an auto-incremental primary key type, will be converted into "int(11) NOT NULL AUTO_INCREMENT PRIMARY KEY"
* - `bigpk`: an auto-incremental primary key type, will be converted into "bigint(20) NOT NULL AUTO_INCREMENT PRIMARY KEY"
* - `string`: string type, will be converted into "varchar(255)"
* - `text`: a long string type, will be converted into "text"
* - `smallint`: a small integer type, will be converted into "smallint(6)"
* - `integer`: integer type, will be converted into "int(11)"
* - `bigint`: a big integer type, will be converted into "bigint(20)"
* - `boolean`: boolean type, will be converted into "tinyint(1)"
* - `float``: float number type, will be converted into "float"
* - `decimal`: decimal number type, will be converted into "decimal"
* - `datetime`: datetime type, will be converted into "datetime"
* - `timestamp`: timestamp type, will be converted into "timestamp"
* - `time`: time type, will be converted into "time"
* - `date`: date type, will be converted into "date"
* - `money`: money type, will be converted into "decimal(19,4)"
* - `binary`: binary data type, will be converted into "blob"
*
* If the abstract type contains two or more parts separated by spaces (e.g. "string NOT NULL"), then only
* the first part will be converted, and the rest of the parts will be appended to the converted result.
* For example, 'string NOT NULL' is converted to 'varchar(255) NOT NULL'.
*
* For some of the abstract types you can also specify a length or precision constraint
* by prepending it in round brackets directly to the type.
* For example `string(32)` will be converted into "varchar(32)" on a MySQL database.
* If the underlying DBMS does not support these kind of constraints for a type it will
* be ignored.
*
* If a type cannot be found in [[typeMap]], it will be returned without any change.
* @param string $type abstract column type
* @return string physical column type.
*/
public function getColumnType($type)
{
if (isset($this->typeMap[$type])) {
return $this->typeMap[$type];
} elseif (preg_match('/^(\w+)\((.+?)\)(.*)$/', $type, $matches)) {
if (isset($this->typeMap[$matches[1]])) {
return preg_replace('/\(.+\)/', '(' . $matches[2] . ')', $this->typeMap[$matches[1]]) . $matches[3];
}
} elseif (preg_match('/^(\w+)\s+/', $type, $matches)) {
if (isset($this->typeMap[$matches[1]])) {
return preg_replace('/^\w+/', $this->typeMap[$matches[1]], $type);
}
}
return $type;
}
/**
* @param array $columns
* @param boolean $distinct
* @param string $selectOption
* @return string the SELECT clause built from [[query]].
*/
public function buildSelect(&$query, $columns)
{
if (empty($columns)) {
return;
}
foreach ($columns as $i => $column) {
if (is_object($column)) {
$columns[$i] = (string)$column;
}
}
$query['fields'] = $columns;
}
/**
* @param array $columns
* @return string the ORDER BY clause built from [[query]].
*/
public function buildOrderBy(&$query, $columns)
{
if (empty($columns)) {
return;
}
$orders = array();
foreach ($columns as $name => $direction) {
// allow elasticsearch extended syntax as described in http://www.elasticsearch.org/guide/reference/api/search/sort/
if (is_array($direction)) {
$orders[] = array($name => $direction);
} elseif (is_string($direction)) {
$orders[] = $direction;
} else {
$orders[] = array($name => ($direction === Query::SORT_DESC ? 'desc' : 'asc'));
}
}
$query['sort'] = $orders;
}
/**
* @param integer $limit
* @param integer $offset
* @return string the LIMIT and OFFSET clauses built from [[query]].
*/
public function buildLimit(&$query, $limit, $offset)
{
if ($limit !== null && $limit >= 0) {
$query['size'] = $limit;
}
if ($offset > 0) {
$query['from'] = (int) $offset;
}
}
/**
* Parses the condition specification and generates the corresponding SQL expression.
* @param string|array $condition the condition specification. Please refer to [[Query::where()]]
* on how to specify a condition.
* @param array $params the binding parameters to be populated
* @return string the generated SQL expression
* @throws \yii\db\Exception if the condition is in bad format
*/
public function buildCondition(&$query, $condition)
{
static $builders = array(
'AND' => 'buildAndCondition',
'OR' => 'buildAndCondition',
'BETWEEN' => 'buildBetweenCondition',
'NOT BETWEEN' => 'buildBetweenCondition',
'IN' => 'buildInCondition',
'NOT IN' => 'buildInCondition',
'LIKE' => 'buildLikeCondition',
'NOT LIKE' => 'buildLikeCondition',
'OR LIKE' => 'buildLikeCondition',
'OR NOT LIKE' => 'buildLikeCondition',
);
if (empty($condition)) {
return;
}
if (!is_array($condition)) {
throw new NotSupportedException('String conditions are not supported by elasticsearch.');
}
if (isset($condition[0])) { // operator format: operator, operand 1, operand 2, ...
$operator = strtoupper($condition[0]);
if (isset($builders[$operator])) {
$method = $builders[$operator];
array_shift($condition);
$this->$method($query, $operator, $condition);
} else {
throw new Exception('Found unknown operator in query: ' . $operator);
}
} else { // hash format: 'column1' => 'value1', 'column2' => 'value2', ...
$this->buildHashCondition($query, $condition);
}
}
private function buildHashCondition(&$query, $condition)
{
foreach($condition as $attribute => $value) {
// ['query']['filteredQuery']
$query['filter']['bool']['must'][] = array(
'term' => array($attribute => $value),
);
}
return; // TODO more
$parts = array();
foreach ($condition as $column => $value) {
if (is_array($value)) { // IN condition
$parts[] = $this->buildInCondition('IN', array($column, $value), $params);
} else {
if ($value === null) {
$parts[] = "$column IS NULL"; // TODO null
} elseif ($value instanceof Expression) {
$parts[] = "$column=" . $value->expression;
foreach ($value->params as $n => $v) {
$params[$n] = $v;
}
} else {
$phName = self::PARAM_PREFIX . count($params);
$parts[] = "$column=$phName";
$params[$phName] = $value;
}
}
}
return count($parts) === 1 ? $parts[0] : '(' . implode(') AND (', $parts) . ')';
}
private function buildAndCondition($operator, $operands, &$params)
{
$parts = array();
foreach ($operands as $operand) {
if (is_array($operand)) {
$operand = $this->buildCondition($operand, $params);
}
if ($operand !== '') {
$parts[] = $operand;
}
}
if (!empty($parts)) {
return '(' . implode(") $operator (", $parts) . ')';
} else {
return '';
}
}
private function buildBetweenCondition($operator, $operands, &$params)
{
if (!isset($operands[0], $operands[1], $operands[2])) {
throw new Exception("Operator '$operator' requires three operands.");
}
list($column, $value1, $value2) = $operands;
if (strpos($column, '(') === false) {
$column = $this->db->quoteColumnName($column);
}
$phName1 = self::PARAM_PREFIX . count($params);
$params[$phName1] = $value1;
$phName2 = self::PARAM_PREFIX . count($params);
$params[$phName2] = $value2;
return "$column $operator $phName1 AND $phName2";
}
private function buildInCondition($operator, $operands, &$params)
{
if (!isset($operands[0], $operands[1])) {
throw new Exception("Operator '$operator' requires two operands.");
}
list($column, $values) = $operands;
$values = (array)$values;
if (empty($values) || $column === array()) {
return $operator === 'IN' ? '0=1' : '';
}
if (count($column) > 1) {
return $this->buildCompositeInCondition($operator, $column, $values, $params);
} elseif (is_array($column)) {
$column = reset($column);
}
foreach ($values as $i => $value) {
if (is_array($value)) {
$value = isset($value[$column]) ? $value[$column] : null;
}
if ($value === null) {
$values[$i] = 'NULL';
} elseif ($value instanceof Expression) {
$values[$i] = $value->expression;
foreach ($value->params as $n => $v) {
$params[$n] = $v;
}
} else {
$phName = self::PARAM_PREFIX . count($params);
$params[$phName] = $value;
$values[$i] = $phName;
}
}
if (strpos($column, '(') === false) {
$column = $this->db->quoteColumnName($column);
}
if (count($values) > 1) {
return "$column $operator (" . implode(', ', $values) . ')';
} else {
$operator = $operator === 'IN' ? '=' : '<>';
return "$column$operator{$values[0]}";
}
}
protected function buildCompositeInCondition($operator, $columns, $values, &$params)
{
$vss = array();
foreach ($values as $value) {
$vs = array();
foreach ($columns as $column) {
if (isset($value[$column])) {
$phName = self::PARAM_PREFIX . count($params);
$params[$phName] = $value[$column];
$vs[] = $phName;
} else {
$vs[] = 'NULL';
}
}
$vss[] = '(' . implode(', ', $vs) . ')';
}
foreach ($columns as $i => $column) {
if (strpos($column, '(') === false) {
$columns[$i] = $this->db->quoteColumnName($column);
}
}
return '(' . implode(', ', $columns) . ") $operator (" . implode(', ', $vss) . ')';
}
private function buildLikeCondition($operator, $operands, &$params)
{
if (!isset($operands[0], $operands[1])) {
throw new Exception("Operator '$operator' requires two operands.");
}
list($column, $values) = $operands;
$values = (array)$values;
if (empty($values)) {
return $operator === 'LIKE' || $operator === 'OR LIKE' ? '0=1' : '';
}
if ($operator === 'LIKE' || $operator === 'NOT LIKE') {
$andor = ' AND ';
} else {
$andor = ' OR ';
$operator = $operator === 'OR LIKE' ? 'LIKE' : 'NOT LIKE';
}
if (strpos($column, '(') === false) {
$column = $this->db->quoteColumnName($column);
}
$parts = array();
foreach ($values as $value) {
$phName = self::PARAM_PREFIX . count($params);
$params[$phName] = $value;
$parts[] = "$column $operator $phName";
}
return implode($andor, $parts);
}
}