go-clickhouse/ch/query_table_truncate.go

package ch

import (
	"context"
	"database/sql"

	"github.com/uptrace/go-clickhouse/ch/chschema"
	"github.com/uptrace/go-clickhouse/ch/internal"
)

type TruncateTableQuery struct {
	baseQuery

	ifExists bool
}

var _ Query = (*TruncateTableQuery)(nil)

func NewTruncateTableQuery(db *DB) *TruncateTableQuery {
	q := &TruncateTableQuery{
		baseQuery: baseQuery{
			db: db,
		},
	}
	return q
}

func (q *TruncateTableQuery) Model(model any) *TruncateTableQuery {
	q.setTableModel(model)
	return q
}

//------------------------------------------------------------------------------

func (q *TruncateTableQuery) Table(tables ...string) *TruncateTableQuery {
	for _, table := range tables {
		q.addTable(chschema.UnsafeIdent(table))
	}
	return q
}

func (q *TruncateTableQuery) TableExpr(query string, args ...any) *TruncateTableQuery {
	q.addTable(chschema.SafeQuery(query, args))
	return q
}

//------------------------------------------------------------------------------

func (q *TruncateTableQuery) IfExists() *TruncateTableQuery {
	q.ifExists = true
	return q
}

//------------------------------------------------------------------------------

func (q *TruncateTableQuery) Operation() string {
	return "TRUNCATE TABLE"
}

func (q *TruncateTableQuery) AppendQuery(
	fmter chschema.Formatter, b []byte,
) (_ []byte, err error) {
	if q.err != nil {
		return nil, q.err
	}

	b = append(b, "TRUNCATE TABLE "...)
	if q.ifExists {
		b = append(b, "IF EXISTS "...)
	}

	b, err = q.appendTables(fmter, b)
	if err != nil {
		return nil, err
	}

	return b, nil
}

//------------------------------------------------------------------------------

func (q *TruncateTableQuery) Exec(ctx context.Context, dest ...any) (sql.Result, error) {
	queryBytes, err := q.AppendQuery(q.db.fmter, q.db.makeQueryBytes())
	if err != nil {
		return nil, err
	}
	query := internal.String(queryBytes)

	res, err := q.exec(ctx, q, query)
	if err != nil {
		return nil, err
	}

	return res, nil
}