1 files changed, 92 insertions, 0 deletions
diff --git a/lib/private/DB/QueryBuilder/FunctionBuilder/OCIFunctionBuilder.php b/lib/private/DB/QueryBuilder/FunctionBuilder/OCIFunctionBuilder.php
new file mode 100644
index 00000000000..47a8eaa6fd0
--- /dev/null
+++ b/lib/private/DB/QueryBuilder/FunctionBuilder/OCIFunctionBuilder.php
@@ -0,0 +1,92 @@
+<?php
+
+/**
+ * SPDX-FileCopyrightText: 2017 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OC\DB\QueryBuilder\FunctionBuilder;
+
+use OC\DB\QueryBuilder\QueryFunction;
+use OCP\DB\QueryBuilder\ILiteral;
+use OCP\DB\QueryBuilder\IParameter;
+use OCP\DB\QueryBuilder\IQueryFunction;
+
+class OCIFunctionBuilder extends FunctionBuilder {
+	public function md5($input): IQueryFunction {
+		if (version_compare($this->connection->getServerVersion(), '20', '>=')) {
+			return new QueryFunction('LOWER(STANDARD_HASH(' . $this->helper->quoteColumnName($input) . ", 'MD5'))");
+		}
+		return new QueryFunction('LOWER(DBMS_OBFUSCATION_TOOLKIT.md5 (input => UTL_RAW.cast_to_raw(' . $this->helper->quoteColumnName($input) . ')))');
+	}
+
+	/**
+	 * As per https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions060.htm
+	 * Oracle uses the first value to cast the rest or the values. So when the
+	 * first value is a literal, plain value or column, instead of doing the
+	 * math, it will cast the expression to int and continue with a "0". So when
+	 * the second parameter is a function or column, we have to put that as
+	 * first parameter.
+	 *
+	 * @param string|ILiteral|IParameter|IQueryFunction $x
+	 * @param string|ILiteral|IParameter|IQueryFunction $y
+	 * @return IQueryFunction
+	 */
+	public function greatest($x, $y): IQueryFunction {
+		if (is_string($y) || $y instanceof IQueryFunction) {
+			return parent::greatest($y, $x);
+		}
+
+		return parent::greatest($x, $y);
+	}
+
+	/**
+	 * As per https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions060.htm
+	 * Oracle uses the first value to cast the rest or the values. So when the
+	 * first value is a literal, plain value or column, instead of doing the
+	 * math, it will cast the expression to int and continue with a "0". So when
+	 * the second parameter is a function or column, we have to put that as
+	 * first parameter.
+	 *
+	 * @param string|ILiteral|IParameter|IQueryFunction $x
+	 * @param string|ILiteral|IParameter|IQueryFunction $y
+	 * @return IQueryFunction
+	 */
+	public function least($x, $y): IQueryFunction {
+		if (is_string($y) || $y instanceof IQueryFunction) {
+			return parent::least($y, $x);
+		}
+
+		return parent::least($x, $y);
+	}
+
+	public function concat($x, ...$expr): IQueryFunction {
+		$args = func_get_args();
+		$list = [];
+		foreach ($args as $item) {
+			$list[] = $this->helper->quoteColumnName($item);
+		}
+		return new QueryFunction(sprintf('(%s)', implode(' || ', $list)));
+	}
+
+	public function groupConcat($expr, ?string $separator = ','): IQueryFunction {
+		$orderByClause = ' WITHIN GROUP(ORDER BY NULL)';
+		if (is_null($separator)) {
+			return new QueryFunction('LISTAGG(' . $this->helper->quoteColumnName($expr) . ')' . $orderByClause);
+		}
+
+		$separator = $this->connection->quote($separator);
+		return new QueryFunction('LISTAGG(' . $this->helper->quoteColumnName($expr) . ', ' . $separator . ')' . $orderByClause);
+	}
+
+	public function octetLength($field, $alias = ''): IQueryFunction {
+		$alias = $alias ? (' AS ' . $this->helper->quoteColumnName($alias)) : '';
+		$quotedName = $this->helper->quoteColumnName($field);
+		return new QueryFunction('COALESCE(LENGTHB(' . $quotedName . '), 0)' . $alias);
+	}
+
+	public function charLength($field, $alias = ''): IQueryFunction {
+		$alias = $alias ? (' AS ' . $this->helper->quoteColumnName($alias)) : '';
+		$quotedName = $this->helper->quoteColumnName($field);
+		return new QueryFunction('COALESCE(LENGTH(' . $quotedName . '), 0)' . $alias);
+	}
+}