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<?php |
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/** |
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* @author Jared King <[email protected]> |
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* |
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* @link http://jaredtking.com |
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* |
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* @copyright 2015 Jared King |
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* @license MIT |
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*/ |
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namespace JAQB\Statement; |
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class WhereStatement extends Statement |
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{ |
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/** |
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* @var bool |
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*/ |
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protected $having; |
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/** |
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* @var array |
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*/ |
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protected $conditions = []; |
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/** |
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* @param bool $having when true, statement becomes a having statement |
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*/ |
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public function __construct($having = false) |
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{ |
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$this->having = $having; |
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} |
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/** |
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* Tells whether this statement is a HAVING statement. |
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* |
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* @return bool true: is HAVING, false: is WHERE |
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*/ |
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public function isHaving() |
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{ |
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return $this->having; |
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} |
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/** |
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* Adds a condition to the statement. |
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* |
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* Accepts the following forms: |
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* 1. Equality comparison: |
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* addCondition('username', 'john') |
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* 2. Comparison with custom operator: |
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* addCondition('balance', 100, '>') |
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* 3. IN statement: |
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* addCondition('group', ['admin', 'owner']) |
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* 4. SQL fragment: |
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* addCondition('name LIKE "%john%"') |
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* 5. List of conditions to add: |
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* addCondition([['balance', 100, '>'], |
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* ['user_id', 5]]) |
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* 6. Map of equality comparisons: |
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* addCondition(['username' => 'john', |
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* 'user_id' => 5]) |
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* 7. List of SQL fragments: |
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* addCondition(['first_name LIKE "%john%"', |
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* 'last_name LIKE "%doe%"']) |
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* |
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* @param array|string $field |
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* @param string|bool $value condition value (optional) |
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* @param string $operator operator (optional) |
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* |
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* @return self |
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*/ |
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public function addCondition($field, $value = false, $operator = '=') |
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{ |
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if (is_array($field) && !$value) { |
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foreach ($field as $key => $value) { |
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// handles #5 |
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if (is_array($value)) { |
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call_user_func_array([$this, 'addCondition'], $value); |
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// handles #6 |
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} elseif (!is_numeric($key)) { |
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$this->addCondition($key, $value); |
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// handles #7 |
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} else { |
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$this->addCondition($value); |
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} |
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} |
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} else { |
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// handles #4 |
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$condition = [$field]; |
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if (func_num_args() >= 2) { |
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// handles #3 |
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if (is_array($value)) { |
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$operator = 'IN'; |
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} |
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// handles #1 and #2 |
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$condition[] = $operator; |
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$condition[] = $value; |
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} |
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$this->conditions[] = $condition; |
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} |
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return $this; |
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} |
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/** |
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* Gets the conditions for this statement. |
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* |
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* @return array |
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*/ |
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public function getConditions() |
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{ |
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return $this->conditions; |
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} |
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/** |
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* Builds a parameterized and escaped SQL fragment |
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* for a condition that uses our own internal |
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* representation. |
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* |
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* A condition is represented by an array, and can be |
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* have one of the following forms: |
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* i) ['SQL fragment'] |
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* ii) ['identifier', '=', 'value'] |
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* |
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* @param array $cond |
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* |
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* @return string generated SQL fragment |
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*/ |
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protected function buildClause(array $cond) |
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{ |
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// handle SQL fragments |
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if (count($cond) == 1) { |
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return $cond[0]; |
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} |
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// escape the identifier |
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$cond[0] = $this->escapeIdentifier($cond[0]); |
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if (empty($cond[0])) { |
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return ''; |
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} |
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// handle NULL values |
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if ($cond[1] === '=' && $cond[2] === null) { |
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return $cond[0].' IS NULL'; |
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} |
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// handle array values, i.e. for IN conditions |
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if (is_array($cond[2])) { |
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foreach ($cond[2] as &$value) { |
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$value = $this->parameterize($value); |
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} |
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$cond[2] = '('.implode(',', $cond[2]).')'; |
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// otherwise parameterize the value |
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} else { |
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$cond[2] = $this->parameterize($cond[2]); |
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} |
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return implode(' ', $cond); |
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} |
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public function build() |
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{ |
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// reset the parameterized values |
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$this->values = []; |
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// build clause from conditions |
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$clauses = []; |
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foreach ($this->conditions as $condition) { |
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$clauses[] = $this->buildClause($condition); |
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} |
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// remove empty values |
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$clauses = array_filter($clauses); |
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if (count($clauses) == 0) { |
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return ''; |
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} |
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$sql = (!$this->having) ? 'WHERE ' : 'HAVING '; |
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return $sql.implode(' AND ', $clauses); |
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} |
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} |
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jaredtking /
jaqb
