Merge pull request #30378 from nextcloud/feature/accept-multiple-args-on-concat

Accept multipe args on concat

lib/private/DB/QueryBuilder/FunctionBuilder/FunctionBuilder.php

 		return new QueryFunction('MD5(' . $this->helper->quoteColumnName($input) . ')');
 	}
 
-	public function concat($x, $y): IQueryFunction {
-		return new QueryFunction('CONCAT(' . $this->helper->quoteColumnName($x) . ', ' . $this->helper->quoteColumnName($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('CONCAT(%s)', implode(', ', $list)));
 	}
 
 	public function groupConcat($expr, ?string $separator = ','): IQueryFunction {

lib/private/DB/QueryBuilder/FunctionBuilder/OCIFunctionBuilder.php

 		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)) {

lib/private/DB/QueryBuilder/FunctionBuilder/PgSqlFunctionBuilder.php

 use OCP\DB\QueryBuilder\IQueryFunction;
 
 class PgSqlFunctionBuilder extends FunctionBuilder {
-	public function concat($x, $y): IQueryFunction {
-		return new QueryFunction('(' . $this->helper->quoteColumnName($x) . ' || ' . $this->helper->quoteColumnName($y) . ')');
+	public function concat($x, ...$expr): IQueryFunction {
+		$args = func_get_args();
+		$list = [];
+		foreach ($args as $item) {
+			$list[] = $this->queryBuilder->expr()->castColumn($item, IQueryBuilder::PARAM_STR);
+		}
+		return new QueryFunction(sprintf('(%s)', implode(' || ', $list)));
 	}
 
 	public function groupConcat($expr, ?string $separator = ','): IQueryFunction {

lib/private/DB/QueryBuilder/FunctionBuilder/SqliteFunctionBuilder.php

 use OCP\DB\QueryBuilder\IQueryFunction;
 
 class SqliteFunctionBuilder extends FunctionBuilder {
-	public function concat($x, $y): IQueryFunction {
-		return new QueryFunction('(' . $this->helper->quoteColumnName($x) . ' || ' . $this->helper->quoteColumnName($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 {

lib/public/DB/QueryBuilder/IFunctionBuilder.php

 	/**
 	 * Combines two input strings
 	 *
-	 * @param string|ILiteral|IParameter|IQueryFunction $x The first input string
-	 * @param string|ILiteral|IParameter|IQueryFunction $y The second input string
+	 * @param string|ILiteral|IParameter|IQueryFunction $x Expressions or literal strings
+	 * @param string|ILiteral|IParameter|IQueryFunction ...$exprs Expressions or literal strings
 	 *
 	 * @return IQueryFunction
 	 * @since 12.0.0
 	 */
-	public function concat($x, $y): IQueryFunction;
+	public function concat($x, ...$expr): IQueryFunction;
 
 	/**
 	 * Returns a string which is the concatenation of all non-NULL values of X

tests/lib/DB/QueryBuilder/FunctionBuilderTest.php

 		$this->connection = \OC::$server->getDatabaseConnection();
 	}
 
-	public function testConcat() {
+	/**
+	 * @dataProvider providerTestConcatString
+	 */
+	public function testConcatString($closure) {
 		$query = $this->connection->getQueryBuilder();
+		[$real, $arguments, $return] = $closure($query);
+		if ($real) {
+			$this->addDummyData();
+			$query->where($query->expr()->eq('appid', $query->createNamedParameter('group_concat')));
+		}
 
-		$query->select($query->func()->concat($query->createNamedParameter('foo'), new Literal("'bar'")));
+		$query->select($query->func()->concat(...$arguments));
 		$query->from('appconfig')
 			->setMaxResults(1);
 
 		$result = $query->execute();
 		$column = $result->fetchOne();
 		$result->closeCursor();
-		$this->assertEquals('foobar', $column);
+		$this->assertEquals($return, $column);
+	}
+
+	public function providerTestConcatString(): array {
+		return [
+			'1 column: string param unicode' =>
+				[function ($q) {
+					return [false, [$q->createNamedParameter('👍')], '👍'];
+				}],
+			'2 columns: string param and string param' =>
+				[function ($q) {
+					return [false, [$q->createNamedParameter('foo'), $q->createNamedParameter('bar')], 'foobar'];
+				}],
+			'2 columns: string param and int literal' =>
+				[function ($q) {
+					return [false, [$q->createNamedParameter('foo'), $q->expr()->literal(1)], 'foo1'];
+				}],
+			'2 columns: string param and string literal' =>
+				[function ($q) {
+					return [false, [$q->createNamedParameter('foo'), $q->expr()->literal('bar')], 'foobar'];
+				}],
+			'2 columns: string real and int literal' =>
+				[function ($q) {
+					return [true, ['configkey', $q->expr()->literal(2)], '12'];
+				}],
+			'4 columns: string literal' =>
+				[function ($q) {
+					return [false, [$q->expr()->literal('foo'), $q->expr()->literal('bar'), $q->expr()->literal('foo'), $q->expr()->literal('bar')], 'foobarfoobar'];
+				}],
+			'4 columns: int literal' =>
+				[function ($q) {
+					return [false, [$q->expr()->literal(1), $q->expr()->literal(2), $q->expr()->literal(3), $q->expr()->literal(4)], '1234'];
+				}],
+			'5 columns: string param with special chars used in the function' =>
+				[function ($q) {
+					return [false, [$q->createNamedParameter("b"), $q->createNamedParameter("'"), $q->createNamedParameter('||'), $q->createNamedParameter(','), $q->createNamedParameter('a')], "b'||,a"];
+				}],
+		];
 	}
 
 	protected function clearDummyData(): void {
 		$result = $query->execute();
 		$column = $result->fetchOne();
 		$result->closeCursor();
-		$this->assertEquals('1,2,3', $column);
 		$this->assertStringContainsString(',', $column);
 		$actual = explode(',', $column);
 		$this->assertEqualsCanonicalizing([1,2,3], $actual);
 		$result = $query->execute();
 		$column = $result->fetchOne();
 		$result->closeCursor();
-		$this->assertEquals('1\'2\'3', $column);
+		$this->assertStringContainsString("'", $column);
+		$actual = explode("'", $column);
+		$this->assertEqualsCanonicalizing([1,2,3], $actual);
 	}
 
 	public function testGroupConcatWithDoubleQuoteSeparator(): void {
 		$result = $query->execute();
 		$column = $result->fetchOne();
 		$result->closeCursor();
-		$this->assertEquals('1"2"3', $column);
+		$this->assertStringContainsString('"', $column);
+		$actual = explode('"', $column);
+		$this->assertEqualsCanonicalizing([1,2,3], $actual);
 	}
 
 	protected function clearIntDummyData(): void {