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<?php |
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namespace Aura\SqlQuery\Common; |
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use Aura\SqlQuery\Exception; |
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abstract class AbstractBuilder |
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{ |
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public function __construct($quoter) |
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{ |
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$this->quoter = $quoter; |
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} |
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/** |
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* |
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* Builds the flags as a space-separated string. |
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* |
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* @return string |
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* |
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*/ |
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public function buildFlags($flags) |
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{ |
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if (empty($flags)) { |
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return ''; // not applicable |
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} |
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return ' ' . implode(' ', array_keys($flags)); |
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} |
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/** |
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* |
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* Builds the `WHERE` clause of the statement. |
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* |
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* @return string |
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* |
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*/ |
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public function buildWhere($where) |
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{ |
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if (empty($where)) { |
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return ''; // not applicable |
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} |
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return PHP_EOL . 'WHERE' . $this->indent($where); |
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} |
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/** |
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* |
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* Builds the `ORDER BY ...` clause of the statement. |
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* |
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* @return string |
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* |
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*/ |
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public function buildOrderBy($order_by) |
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{ |
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if (empty($order_by)) { |
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return ''; // not applicable |
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} |
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return PHP_EOL . 'ORDER BY' . $this->indentCsv($order_by); |
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} |
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/** |
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* |
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* Builds the `LIMIT` clause of the statement. |
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* |
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* @return string |
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* |
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*/ |
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public function buildLimit($limit) |
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{ |
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if (empty($limit)) { |
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return ''; |
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} |
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return PHP_EOL . "LIMIT {$limit}"; |
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} |
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/** |
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* |
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* Builds the `LIMIT ... OFFSET` clause of the statement. |
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* |
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* @return string |
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* |
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*/ |
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public function buildLimitOffset($limit, $offset) |
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{ |
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$clause = ''; |
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if (!empty($limit)) { |
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$clause .= "LIMIT {$limit}"; |
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} |
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if (!empty($offset)) { |
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$clause .= " OFFSET {$offset}"; |
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} |
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if (!empty($clause)) { |
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$clause = PHP_EOL . trim($clause); |
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} |
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return $clause; |
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} |
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/** |
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* |
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* Builds the `RETURNING` clause of the statement. |
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* |
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* @return string |
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* |
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*/ |
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public function buildReturning($returning) |
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{ |
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if (empty($returning)) { |
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return ''; // not applicable |
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} |
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return PHP_EOL . 'RETURNING' . $this->indentCsv($returning); |
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} |
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/** |
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* |
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* Returns an array as an indented comma-separated values string. |
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* |
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* @param array $list The values to convert. |
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* |
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* @return string |
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* |
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*/ |
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public function indentCsv(array $list) |
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{ |
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return PHP_EOL . ' ' |
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. implode(',' . PHP_EOL . ' ', $list); |
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} |
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/** |
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* |
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* Returns an array as an indented string. |
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* |
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* @param array $list The values to convert. |
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* |
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* @return string |
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* |
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*/ |
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public function indent(array $list) |
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{ |
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return PHP_EOL . ' ' |
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. implode(PHP_EOL . ' ', $list); |
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} |
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} |
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In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: