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// SPDX-FileCopyrightText: 2026 Stefan Majewsky <majewsky@gmx.net>
// SPDX-License-Identifier: Apache-2.0
package internal
import (
"strconv"
"strings"
)
// Dialect is a copy of the interface of the same name in package oblast.
// We cannot refer to that interface within this package because that would constitute a cyclic dependency.
type Dialect interface {
Placeholder(i int) string
QuoteIdentifier(name string) string
UsesLastInsertID() bool
InsertSuffixForAutoColumns(columns []string) string
}
// PostgresDialect is the dialect of PostgreSQL databases.
type PostgresDialect struct{}
func (PostgresDialect) Placeholder(i int) string { return "$" + strconv.Itoa(i) }
func (PostgresDialect) QuoteIdentifier(name string) string { return `"` + name + `"` }
func (PostgresDialect) UsesLastInsertID() bool { return false }
func (p PostgresDialect) InsertSuffixForAutoColumns(columns []string) string {
quotedColumns := make([]string, len(columns))
for idx, name := range columns {
quotedColumns[idx] = p.QuoteIdentifier(name)
}
return ` RETURNING ` + strings.Join(quotedColumns, ", ")
}
// SqliteDialect is the dialect of SQLite databases.
type SqliteDialect struct{}
func (SqliteDialect) Placeholder(_ int) string { return "?" }
func (SqliteDialect) QuoteIdentifier(name string) string { return `"` + name + `"` }
func (SqliteDialect) UsesLastInsertID() bool { return true }
func (SqliteDialect) InsertSuffixForAutoColumns(columns []string) string { return "" }
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