class BasicSyntaxTest

class BasicSyntaxTest extends DatabaseTestBase {
    
    /**
     * Tests string concatenation.
     */
    public function testConcatLiterals() : void {
        $result = $this->connection
            ->query('SELECT CONCAT(:a1, CONCAT(:a2, CONCAT(:a3, CONCAT(:a4, :a5))))', [
            ':a1' => 'This',
            ':a2' => ' ',
            ':a3' => 'is',
            ':a4' => ' a ',
            ':a5' => 'test.',
        ]);
        $this->assertSame('This is a test.', $result->fetchField(), 'Basic CONCAT works.');
    }
    
    /**
     * Tests string concatenation with field values.
     *
     * We use 'job' and 'age' fields from the {test} table. Using the 'name' field
     * for concatenation causes issues with custom or contrib database drivers,
     * since its type 'varchar_ascii' may lead to using field-level collations not
     * compatible with the other fields.
     */
    public function testConcatFields() : void {
        $result = $this->connection
            ->query('SELECT CONCAT(:a1, CONCAT([job], CONCAT(:a2, CONCAT([age], :a3)))) FROM {test} WHERE [age] = :age', [
            ':a1' => 'The age of ',
            ':a2' => ' is ',
            ':a3' => '.',
            ':age' => 25,
        ]);
        $this->assertSame('The age of Singer is 25.', $result->fetchField(), 'Field CONCAT works.');
    }
    
    /**
     * Tests string concatenation with separator.
     */
    public function testConcatWsLiterals() : void {
        $result = $this->connection
            ->query("SELECT CONCAT_WS(', ', :a1, NULL, :a2, :a3, :a4)", [
            ':a1' => 'Hello',
            ':a2' => NULL,
            ':a3' => '',
            ':a4' => 'world.',
        ]);
        $this->assertSame('Hello, , world.', $result->fetchField());
    }
    
    /**
     * Tests string concatenation with separator, with field values.
     */
    public function testConcatWsFields() : void {
        $result = $this->connection
            ->query("SELECT CONCAT_WS('-', :a1, [name], :a2, [age]) FROM {test} WHERE [age] = :age", [
            ':a1' => 'name',
            ':a2' => 'age',
            ':age' => 25,
        ]);
        $this->assertSame('name-John-age-25', $result->fetchField());
    }
    
    /**
     * Tests escaping of LIKE wildcards.
     */
    public function testLikeEscape() : void {
        $this->connection
            ->insert('test')
            ->fields([
            'name' => 'Ring_',
        ])
            ->execute();
        // Match both "Ringo" and "Ring_".
        $num_matches = $this->connection
            ->select('test', 't')
            ->condition('name', 'Ring_', 'LIKE')
            ->countQuery()
            ->execute()
            ->fetchField();
        $this->assertSame('2', $num_matches, 'Found 2 records.');
        // Match only "Ring_" using a LIKE expression with no wildcards.
        $num_matches = $this->connection
            ->select('test', 't')
            ->condition('name', $this->connection
            ->escapeLike('Ring_'), 'LIKE')
            ->countQuery()
            ->execute()
            ->fetchField();
        $this->assertSame('1', $num_matches, 'Found 1 record.');
    }
    
    /**
     * Tests a LIKE query containing a backslash.
     */
    public function testLikeBackslash() : void {
        $this->connection
            ->insert('test')
            ->fields([
            'name',
        ])
            ->values([
            'name' => 'abcde\\f',
        ])
            ->values([
            'name' => 'abc%\\_',
        ])
            ->execute();
        // Match both rows using a LIKE expression with two wildcards and a verbatim
        // backslash.
        $num_matches = $this->connection
            ->select('test', 't')
            ->condition('name', 'abc%\\\\_', 'LIKE')
            ->countQuery()
            ->execute()
            ->fetchField();
        $this->assertSame('2', $num_matches, 'Found 2 records.');
        // Match only the former using a LIKE expression with no wildcards.
        $num_matches = $this->connection
            ->select('test', 't')
            ->condition('name', $this->connection
            ->escapeLike('abc%\\_'), 'LIKE')
            ->countQuery()
            ->execute()
            ->fetchField();
        $this->assertSame('1', $num_matches, 'Found 1 record.');
    }
    
    /**
     * Tests \Drupal\Core\Database\Connection::getFullQualifiedTableName().
     */
    public function testGetFullQualifiedTableName() : void {
        $database = \Drupal::database();
        $num_matches = $database->select($database->getFullQualifiedTableName('test'), 't')
            ->countQuery()
            ->execute()
            ->fetchField();
        $this->assertSame('4', $num_matches, 'Found 4 records.');
    }

}