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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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abstract class Statement |
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{ |
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/** |
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* @var array |
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*/ |
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protected $values = []; |
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/** |
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* Generates the raw SQL string for the statement. |
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* |
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* @return string |
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*/ |
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abstract public function build(); |
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/** |
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* Gets the values associated with this statement. |
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* |
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* @return array |
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*/ |
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public function getValues() |
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{ |
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return $this->values; |
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} |
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/** |
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* Escapes potentially reserved keywords in identifiers by wrapping them |
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* with the escape character as necessary. |
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* |
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* @param string $word |
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* @param string $escapeChar |
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* |
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* @return string escaped identifier |
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*/ |
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protected function escapeIdentifier($word, $escapeChar = '`') |
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{ |
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if (is_array($word) || is_object($word) || is_numeric($word)) { |
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return ''; |
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} |
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$spaces = explode(' ', $word); |
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foreach ($spaces as &$space) { |
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if (strtolower($space) == 'as') { |
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$space = 'AS'; |
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} else { |
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$periods = explode('.', $space); |
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foreach ($periods as &$period) { |
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// escape identifiers that are: [0-9,a-z,A-Z$_] |
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if (preg_match('/^[A-Za-z0-9_$]*$/', $period)) { |
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$period = $escapeChar.$period.$escapeChar; |
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// do not use an identifier that contains something other than: |
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// alpha-numeric, _, $, *, /, +, -, (, ) |
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} elseif (!preg_match('/^[A-Za-z0-9_$\*\/\+\-\(\)]*$/', $period)) { |
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$period = ''; |
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} |
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} |
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$space = implode('.', $periods); |
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} |
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} |
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return implode(' ', $spaces); |
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} |
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/** |
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* Parameterizes a function using indexed placeholders. |
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* |
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* @param string $value |
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* |
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* @return string |
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*/ |
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protected function parameterize($value) |
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{ |
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// numbered parameters |
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$this->values[] = $value; |
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return '?'; |
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} |
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/** |
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* Parameterizes a list of values. |
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* |
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* @param array $values |
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* |
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* @return string |
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*/ |
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protected function parameterizeValues(array $values) |
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{ |
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foreach ($values as &$value) { |
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$value = $this->parameterize($value); |
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} |
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return '('.implode(',', $values).')'; |
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} |
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} |
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jaredtking /
jaqb
