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diff --git a/database/src/Engines/PDOEngine.php b/database/src/Engines/PDOEngine.php
--- a/database/src/Engines/PDOEngine.php
+++ b/database/src/Engines/PDOEngine.php
@@ -9,6 +9,7 @@
use Keruald\Database\Exceptions\SqlException;
use Keruald\Database\Result\PDODatabaseResult;
+use Keruald\Database\Query\PDOQuery;
use PDO;
use PDOException;
use RuntimeException;
@@ -145,7 +146,7 @@
$callable($this->cantConnectToHostEvents, [$this, $ex], $ex);
}
- protected function onQueryError (string $query) : void {
+ public function onQueryError (string $query) : void {
$ex = SqlException::fromQuery(
$query,
$this->getExceptionContext(),
@@ -159,6 +160,24 @@
$callable($this->queryErrorEvents, [$this, $query, $ex], $ex);
}
+ ///
+ /// PDO features
+ ///
+
+ /**
+ * Prepares a query for later execution
+ *
+ * @param string $query
+ * @param int[] $options
+ * @return PDOQuery
+ */
+ public function prepare (string $query, array $options = []) : PDOQuery {
+ $statement = $this->db->prepare($query, $options);
+
+ return PDOQuery::from($this, $statement)
+ ->withFetchMode($this->fetchMode);
+ }
+
///
/// Not implemented features
///
diff --git a/database/src/Query/DatabaseQuery.php b/database/src/Query/DatabaseQuery.php
new file mode 100644
--- /dev/null
+++ b/database/src/Query/DatabaseQuery.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace Keruald\Database\Query;
+
+use Keruald\Database\Result\DatabaseResult;
+
+abstract class DatabaseQuery {
+
+ public abstract function query() : ?DatabaseResult;
+
+ public abstract function __toString() : string;
+
+}
diff --git a/database/src/Query/PDOQuery.php b/database/src/Query/PDOQuery.php
new file mode 100644
--- /dev/null
+++ b/database/src/Query/PDOQuery.php
@@ -0,0 +1,126 @@
+<?php
+
+namespace Keruald\Database\Query;
+
+use Keruald\Database\Engines\PDOEngine;
+use Keruald\Database\Result\PDODatabaseResult;
+
+use PDO;
+use PDOStatement;
+
+class PDOQuery extends DatabaseQuery {
+
+ ///
+ /// Private members
+ ///
+
+ private PDOEngine $db;
+
+ private PDOStatement $statement;
+
+ private int $fetchMode = PDO::FETCH_ASSOC;
+
+ ///
+ /// Constructors
+ ///
+
+ public function __construct (PDOEngine $db, PDOStatement $statement) {
+ $this->db = $db;
+ $this->statement = $statement;
+ }
+
+ public static function from (PDOEngine $db, PDOStatement $statement) : self {
+ return new self($db, $statement);
+ }
+
+ ///
+ /// Getters and setters
+ ///
+
+ public function getFetchMode () : int {
+ return $this->fetchMode;
+ }
+
+ public function setFetchMode (int $mode) : void {
+ $this->fetchMode = $mode;
+ }
+
+ public function withFetchMode (int $mode) : self {
+ $this->fetchMode = $mode;
+
+ return $this;
+ }
+
+ ///
+ /// PDO statements like interaction
+ ///
+
+ public function query() : ?PDODatabaseResult {
+ $result = $this->statement->execute();
+
+ if (!$result) {
+ $this->db->onQueryError($this->statement->queryString);
+ return null;
+ }
+
+ return new PDODatabaseResult($this->statement);
+ }
+
+ public function withValue(string $name, mixed $value, ?int $type = null) : self {
+ $type = $type ?? self::resolveParameterType($value);
+ $this->statement->bindValue($name, $value, $type);
+
+ return $this;
+ }
+
+ public function bind(string $name, mixed $value, ?int $type = null) : self {
+ $type = $type ?? self::resolveParameterType($value);
+ $this->statement->bindParam($name, $value, $type);
+
+ return $this;
+ }
+
+ public function bindInOutParameter(string $name, mixed $value, ?int $type = null) : self {
+ $type = $type ?? self::resolveParameterType($value);
+ $this->statement->bindParam($name, $value, $type | PDO::PARAM_INPUT_OUTPUT);
+
+ return $this;
+ }
+
+ ///
+ /// PDO_PARAM_* type resolution
+ ///
+
+ public static function resolveParameterType(mixed $value) : int {
+ if (is_int($value)) {
+ return PDO::PARAM_INT;
+ }
+
+ if (is_null($value)) {
+ return PDO::PARAM_NULL;
+ }
+
+ if (is_bool($value)) {
+ return PDO::PARAM_BOOL;
+ }
+
+ return PDO::PARAM_STR;
+ }
+
+ ///
+ /// Low-level interactions
+ ///
+
+ public function getUnderlyingStatement () : PDOStatement {
+ return $this->statement;
+ }
+
+ ///
+ /// Implements Stringable
+ ///
+
+ public function __toString () : string {
+ return $this->statement->queryString;
+ }
+
+}

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