query_parameters.go

// Licensed to ClickHouse, Inc. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. ClickHouse, Inc. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

package clickhouse

import (
	"github.com/ClickHouse/clickhouse-go/v2/lib/driver"
	"github.com/pkg/errors"
	"regexp"
	"time"
)

var (
	ErrExpectedStringValueInNamedValueForQueryParameter = errors.New("expected string value in NamedValue for query parameter")

	hasQueryParamsRe = regexp.MustCompile("{.+:.+}")
)

func bindQueryOrAppendParameters(paramsProtocolSupport bool, options *QueryOptions, query string, timezone *time.Location, args ...any) (string, error) {
	// prefer native query parameters over legacy bind if query parameters provided explicit
	if len(options.parameters) > 0 {
		return query, nil
	}

	// validate if query contains a {<name>:<data type>} syntax, so it's intentional use of query parameters
	// parameter values will be loaded from `args ...any` for compatibility
	if paramsProtocolSupport &&
		len(args) > 0 &&
		hasQueryParamsRe.MatchString(query) {
		options.parameters = make(Parameters, len(args))
		for _, a := range args {
			if p, ok := a.(driver.NamedValue); ok {
				if str, ok := p.Value.(string); ok {
					options.parameters[p.Name] = str
					continue
				}
			}

			return "", ErrExpectedStringValueInNamedValueForQueryParameter
		}

		return query, nil
	}

	return bind(timezone, query, args...)
}