Source of file QueryBuilderBase.php

<?php declare(strict_types=1);

/**

 * Query

 *

 * SQL Query Builder / Database Abstraction Layer

 *

 * PHP version 7.4

 *

 * @package     Query

 * @author      Timothy J. Warren <tim@timshomepage.net>

 * @copyright   2012 - 2020 Timothy J. Warren

 * @license     http://www.opensource.org/licenses/mit-license.html  MIT License

 * @link        https://git.timshomepage.net/aviat/Query

 * @version     3.0.0

 */

namespace Query;

use function regexInArray;

use BadMethodCallException;

use PDO;

use PDOStatement;

use Query\Drivers\DriverInterface;

/**

 * @method affectedRows(): int

 * @method beginTransaction(): bool

 * @method commit(): bool

 * @method errorCode(): string

 * @method errorInfo(): array

 * @method exec(string $statement): int

 * @method getAttribute(int $attribute)

 * @method getColumns(string $table): array | null

 * @method getDbs(): array | null

 * @method getFks(string $table): array | null

 * @method getFunctions(): array | null

 * @method getIndexes(string $table): array | null

 * @method getLastQuery(): string

 * @method getProcedures(): array | null

 * @method getSchemas(): array | null

 * @method getSequences(): array | null

 * @method getSystemTables(): array | null

 * @method getTables(): array

 * @method getTriggers(): array | null

 * @method getTypes(): array | null

 * @method getUtil(): \Query\Drivers\AbstractUtil

 * @method getVersion(): string

 * @method getViews(): array | null

 * @method inTransaction(): bool

 * @method lastInsertId(string $name = NULL): string

 * @method numRows(): int | null

 * @method prepare(string $statement, array $driver_options = []): PDOStatement

 * @method prepareExecute(string $sql, array $params): PDOStatement

 * @method prepareQuery(string $sql, array $data): PDOStatement

 * @method query(string $statement): PDOStatement

 * @method quote(string $string, int $parameter_type = PDO::PARAM_STR): string

 * @method rollback(): bool

 * @method setAttribute(int $attribute, $value): bool

 * @method setTablePrefix(string $prefix): void

 * @method truncate(string $table): PDOStatement

 */

class QueryBuilderBase {

	/**

	 * Convenience property for connection management

	 * @var string

	 */

	public string $connName = '';

	/**

	 * List of queries executed

	 * @var array

	 */

	public array $queries = [

		'total_time' => 0

	];

	/**

	 * Whether to do only an explain on the query

	 * @var bool

	 */

	protected bool $explain = FALSE;

	/**

	 * Whether to return data from a modification query

	 * @var bool

	 */

	protected bool $returning = FALSE;

	/**

	 * The current database driver

	 * @var DriverInterface

	 */

	protected ?DriverInterface $driver;

	/**

	 * Query parser class instance

	 * @var QueryParser

	 */

	protected QueryParser $parser;

	/**

	 * Query Builder state

	 * @var State

	 */

	protected State $state;

	// --------------------------------------------------------------------------

	// ! Methods

	// --------------------------------------------------------------------------

	/**

	 * Constructor

	 *

	 * @param DriverInterface $driver

	 * @param QueryParser $parser

	 */

	public function __construct(DriverInterface $driver, QueryParser $parser)

	{

		// Inject driver and parser

		$this->driver = $driver;

		$this->parser = $parser;

		// Create new State object

		$this->state = new State();

	}

	/**

	 * Destructor

	 * @codeCoverageIgnore

	 */

	public function __destruct()

	{

		$this->driver = NULL;

	}

	/**

	 * Calls a function further down the inheritance chain.

	 * 'Implements' methods on the driver object

	 *

	 * @param string $name

	 * @param array $params

	 * @return mixed

	 * @throws BadMethodCallException

	 */

	public function __call(string $name, array $params)

	{

		if (method_exists($this->driver, $name))

		{

			return $this->driver->$name(...$params);

		}

		throw new BadMethodCallException('Method does not exist');

	}

	/**

	 * Clear out the class variables, so the next query can be run

	 *

	 * @return void

	 */

	public function resetQuery(): void

	{

		$this->state = new State();

		$this->explain = FALSE;

		$this->returning = FALSE;

	}

	/**

	 * Method to simplify select_ methods

	 *

	 * @param string $field

	 * @param string|bool $as

	 * @return string

	 */

	protected function _select(string $field, $as = FALSE): string

	{

		// Escape the identifiers

		$field = $this->driver->quoteIdent($field);

		if ( ! \is_string($as))

		{

			// @codeCoverageIgnoreStart

			return $field;

			// @codeCoverageIgnoreEnd

		}

		$as = $this->driver->quoteIdent($as);

		return "({$field}) AS {$as} ";

	}

	/**

	 * Helper function for returning sql strings

	 *

	 * @param string $type

	 * @param string $table

	 * @param bool $reset

	 * @return string

	 */

	protected function _getCompile(string $type, string $table, bool $reset): string

	{

		$sql = $this->_compile($type, $table);

		// Reset the query builder for the next query

		if ($reset)

		{

			$this->resetQuery();

		}

		return $sql;

	}

	/**

	 * Simplify 'like' methods

	 *

	 * @param string $field

	 * @param mixed $val

	 * @param string $pos

	 * @param string $like

	 * @param string $conj

	 * @return self

	 */

	protected function _like(string $field, $val, string $pos, string $like = 'LIKE', string $conj = 'AND'): self

	{

		$field = $this->driver->quoteIdent($field);

		// Add the like string into the order map

		$like = $field . " {$like} ?";

		if ($pos === 'before')

		{

			$val = "%{$val}";

		} elseif ($pos === 'after')

		{

			$val = "{$val}%";

		} else

		{

			$val = "%{$val}%";

		}

		$conj = empty($this->state->getQueryMap()) ? ' WHERE ' : " {$conj} ";

		$this->state->appendMap($conj, $like, MapType::LIKE);

		// Add to the values array

		$this->state->appendWhereValues($val);

		return $this;

	}

	/**

	 * Simplify building having clauses

	 *

	 * @param mixed $key

	 * @param mixed $values

	 * @param string $conj

	 * @return self

	 */

	protected function _having($key, $values = [], string $conj = 'AND'): self

	{

		$where = $this->_where($key, $values);

		// Create key/value placeholders

		foreach ($where as $f => $val)

		{

			// Split each key by spaces, in case there

			// is an operator such as >, <, !=, etc.

			$fArray = explode(' ', trim($f));

			$item = $this->driver->quoteIdent($fArray[0]);

			// Simple key value, or an operator

			$item .= (count($fArray) === 1) ? '=?' : " {$fArray[1]} ?";

			// Put in the having map

			$this->state->appendHavingMap([

				'conjunction' => empty($this->state->getHavingMap())

					? ' HAVING '

					: " {$conj} ",

				'string' => $item

			]);

		}

		return $this;

	}

	/**

	 * Do all the redundant stuff for where/having type methods

	 *

	 * @param mixed $key

	 * @param mixed $val

	 * @return array

	 */

	protected function _where($key, $val = []): array

	{

		$where = [];

		$pairs = [];

		if (is_scalar($key))

		{

			$pairs[$key] = $val;

		} else

		{

			$pairs = $key;

		}

		foreach ($pairs as $k => $v)

		{

			$where[$k] = $v;

			$this->state->appendWhereValues($v);

		}

		return $where;

	}

	/**

	 * Simplify generating where string

	 *

	 * @param mixed $key

	 * @param mixed $values

	 * @param string $defaultConj

	 * @return self

	 */

	protected function _whereString($key, $values = [], string $defaultConj = 'AND'): self

	{

		// Create key/value placeholders

		foreach ($this->_where($key, $values) as $f => $val)

		{

			$queryMap = $this->state->getQueryMap();

			// Split each key by spaces, in case there

			// is an operator such as >, <, !=, etc.

			$fArray = explode(' ', trim($f));

			$item = $this->driver->quoteIdent($fArray[0]);

			// Simple key value, or an operator

			$item .= (count($fArray) === 1) ? '=?' : " {$fArray[1]} ?";

			$lastItem = end($queryMap);

			// Determine the correct conjunction

			$conjunctionList = array_column($queryMap, 'conjunction');

			if (empty($queryMap) || ( ! regexInArray($conjunctionList, "/^ ?\n?WHERE/i")))

			{

				$conj = "\nWHERE ";

			} elseif ($lastItem['type'] === 'group_start')

			{

				$conj = '';

			} else

			{

				$conj = " {$defaultConj} ";

			}

			$this->state->appendMap($conj, $item, MapType::WHERE);

		}

		return $this;

	}

	/**

	 * Simplify where_in methods

	 *

	 * @param mixed $key

	 * @param mixed $val

	 * @param string $in - The (not) in fragment

	 * @param string $conj - The where in conjunction

	 * @return self

	 */

	protected function _whereIn($key, $val = [], string $in = 'IN', string $conj = 'AND'): self

	{

		$key = $this->driver->quoteIdent($key);

		$params = array_fill(0, count($val), '?');

		$this->state->appendWhereValues($val);

		$conjunction = empty($this->state->getQueryMap()) ? ' WHERE ' : " {$conj} ";

		$str = $key . " {$in} (" . implode(',', $params) . ') ';

		$this->state->appendMap($conjunction, $str, MapType::WHERE_IN);

		return $this;

	}

	/**

	 * Executes the compiled query

	 *

	 * @param string $type

	 * @param string $table

	 * @param string $sql

	 * @param array|null $vals

	 * @param boolean $reset

	 * @return PDOStatement

	 */

	protected function _run(string $type, string $table, string $sql = NULL, array $vals = NULL, bool $reset = TRUE): PDOStatement

	{

		if ($sql === NULL)

		{

			$sql = $this->_compile($type, $table);

		}

		if ($vals === NULL)

		{

			$vals = array_merge($this->state->getValues(), $this->state->getWhereValues());

		}

		$startTime = microtime(TRUE);

		$res = empty($vals)

			? $this->driver->query($sql)

			: $this->driver->prepareExecute($sql, $vals);

		$endTime = microtime(TRUE);

		$totalTime = number_format($endTime - $startTime, 5);

		// Add this query to the list of executed queries

		$this->_appendQuery($vals, $sql, (int)$totalTime);

		// Reset class state for next query

		if ($reset)

		{

			$this->resetQuery();

		}

		return $res;

	}

	/**

	 * Convert the prepared statement into readable sql

	 *

	 * @param array $values

	 * @param string $sql

	 * @param int $totalTime

	 * @return void

	 */

	protected function _appendQuery(array $values, string $sql, int $totalTime): void

	{

		$evals = is_array($values) ? $values : [];

		$esql = str_replace('?', '%s', $sql);

		// Quote string values

		foreach ($evals as &$v)

		{

			$v = ( ! is_numeric($v))

				? htmlentities($this->driver->quote($v), ENT_NOQUOTES, 'utf-8')

				: $v;

		}

		unset($v);

		// Add the query onto the array of values to pass

		// as arguments to sprintf

		array_unshift($evals, $esql);

		// Add the interpreted query to the list of executed queries

		$this->queries[] = [

			'time' => $totalTime,

			'sql' => sprintf(...$evals)

		];

		$this->queries['total_time'] += $totalTime;

		// Set the last query to get rowcounts properly

		$this->driver->setLastQuery($sql);

	}

	/**

	 * Sub-method for generating sql strings

	 *

	 * @codeCoverageIgnore

	 * @param string $type

	 * @param string $table

	 * @return string

	 */

	protected function _compileType(string $type = QueryType::SELECT, string $table = ''): string

	{

		$setArrayKeys = $this->state->getSetArrayKeys();

		switch ($type)

		{

			case QueryType::INSERT:

				$paramCount = count($setArrayKeys);

				$params = array_fill(0, $paramCount, '?');

				$sql = "INSERT INTO {$table} ("

					. implode(',', $setArrayKeys)

					. ")\nVALUES (" . implode(',', $params) . ')';

				break;

			case QueryType::UPDATE:

				$setString = $this->state->getSetString();

				$sql = "UPDATE {$table}\nSET {$setString}";

				break;

			case QueryType::DELETE:

				$sql = "DELETE FROM {$table}";

				break;

			case QueryType::SELECT:

			default:

				$fromString = $this->state->getFromString();

				$selectString = $this->state->getSelectString();

				$sql = "SELECT * \nFROM {$fromString}";

				// Set the select string

				if ( ! empty($selectString))

				{

					// Replace the star with the selected fields

					$sql = str_replace('*', $selectString, $sql);

				}

				break;

		}

		return $sql;

	}

	/**

	 * String together the sql statements for sending to the db

	 *

	 * @param string $type

	 * @param string $table

	 * @return string

	 */

	protected function _compile(string $type = '', string $table = ''): string

	{

		// Get the base clause for the query

		$sql = $this->_compileType($type, $this->driver->quoteTable($table));

		$clauses = [

			'queryMap',

			'groupString',

			'orderString',

			'havingMap',

		];

		// Set each type of subclause

		foreach ($clauses as $clause)

		{

			$func = 'get' . ucFirst($clause);

			$param = $this->state->$func();

			if (is_array($param))

			{

				foreach ($param as $q)

				{

					$sql .= $q['conjunction'] . $q['string'];

				}

			} else

			{

				$sql .= $param;

			}

		}

		// Set the limit via the class variables

		$limit = $this->state->getLimit();

		if (is_numeric($limit))

		{

			$sql = $this->driver->getSql()->limit($sql, $limit, $this->state->getOffset());

		}

		// Set the returning clause, if applicable

		$sql = $this->_compileReturning($sql, $type);

		// See if the query plan, rather than the

		// query data should be returned

		if ($this->explain === TRUE)

		{

			$sql = $this->driver->getSql()->explain($sql);

		}

		return $sql;

	}

	/**

	 * Generate returning clause of query

	 *

	 * @param string $sql

	 * @param string $type

	 * @return string

	 */

	protected function _compileReturning(string $sql, string $type): string

	{

		if ($this->returning === FALSE)

		{

			return $sql;

		}

		$rawSelect = $this->state->getSelectString();

		$selectString = ($rawSelect === '') ? '*' : $rawSelect;

		$returningSQL = $this->driver->returning($sql, $selectString);

		if ($returningSQL === $sql)

		{

			// If the driver doesn't support the returning clause, it returns the original query.

			// Fake the same result with a transaction and a select query

			if ( ! $this->inTransaction())

			{

				$this->beginTransaction();

			}

			// Generate the appropriate select query for the returning clause fallback

			switch ($type)

			{

				case QueryType::INSERT:

					// @TODO figure out a good response for insert query

					break;

				case QueryType::UPDATE:

					// @TODO figure out a good response for update query

					break;

				case QueryType::INSERT_BATCH:

				case QueryType::UPDATE_BATCH:

					// @TODO figure out a good response for batch queries

					break;

				default:

					// On Delete queries, what would we return?

					break;

			}

		}

		return $returningSQL;

	}

}