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<?php |
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namespace Helix\DB\SQL; |
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use Helix\DB; |
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/** |
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* Produces text related expressions for the instance. |
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*/ |
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trait TextTrait { |
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/** |
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* @var DB |
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*/ |
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protected $db; |
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/** |
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* @return Text |
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*/ |
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public function getHex () { |
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return new Text($this->db, "HEX({$this})"); |
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} |
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/** |
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* Returns the number of characters (not bytes) in the string. |
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* |
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* @see getSize() |
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* |
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* @return Numeric |
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*/ |
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public function getLength () { |
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switch ($this->db->getDriver()) { |
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case 'sqlite': |
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return new Numeric($this->db, "LENGTH(CAST({$this} AS TEXT))"); |
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default: |
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return new Numeric($this->db, "CHAR_LENGTH({$this})"); |
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} |
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} |
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/** |
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* `LOWER($this)` |
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* |
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* @return Text |
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*/ |
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public function getLower () { |
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return new Text($this->db, "LOWER({$this})"); |
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} |
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/** |
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* A substring's position (1-based). |
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* |
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* The position is `0` if the substring isn't found. |
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* |
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* @param string $substring |
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* @return Numeric |
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*/ |
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public function getPosition (string $substring) { |
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$substring = $this->db->quote($substring); |
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switch ($this->db->getDriver()) { |
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case 'sqlite': |
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return new Numeric($this->db, "INSTR({$this},{$substring})"); |
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default: |
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return new Numeric($this->db, "LOCATE({$substring},{$this})"); |
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} |
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} |
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/** |
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* `REPLACE($this,$search,$replace)` |
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* |
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* @param string $search |
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* @param string $replace |
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* @return Text |
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*/ |
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public function getReplacement (string $search, string $replace) { |
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$search = $this->db->quote($search); |
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$replace = $this->db->quote($replace); |
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return new Text($this->db, "REPLACE({$this},{$search},{$replace})"); |
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} |
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/** |
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* The number of bytes in the string. |
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* |
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* @return Numeric |
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*/ |
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public function getSize () { |
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switch ($this->db->getDriver()) { |
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case 'sqlite': |
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return new Numeric($this->db, "LENGTH(CAST({$this} AS BLOB))"); |
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default: |
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return new Numeric($this->db, "LENGTH({$this})"); |
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} |
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} |
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/** |
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* `SUBSTR($this,$start)` or `SUBSTR($this,$start,$length)` |
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* |
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* @param int $start 1-based, can be negative to start from the right. |
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* @param int $length |
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* @return Text |
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*/ |
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public function getSubstring (int $start, int $length = null) { |
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if (isset($length)) { |
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return new Text($this->db, "SUBSTR({$this},{$start},{$length})"); |
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} |
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return new Text($this->db, "SUBSTR({$this},{$start})"); |
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} |
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/** |
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* `UPPER($this)` |
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* |
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* @return Text |
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*/ |
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public function getUpper () { |
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return new Text($this->db, "UPPER({$this})"); |
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} |
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} |
hfw /
db
