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table_id.go
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table_id.go
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// Copyright 2016 The Cockroach Authors.
//
// Licensed 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.
//
// Author: Spencer Kimball (spencer@cockroachlabs.com)
package sqlutils
import (
gosql "database/sql"
)
// QueryDatabaseID returns the database ID of the specified database using the
// system.namespace table.
func QueryDatabaseID(sqlDB *gosql.DB, dbName string) (uint32, error) {
dbIDQuery := `SELECT id FROM system.namespace WHERE name = $1 AND parentID = 0`
var dbID uint32
result := sqlDB.QueryRow(dbIDQuery, dbName)
if err := result.Scan(&dbID); err != nil {
return 0, err
}
return dbID, nil
}
// QueryTableID returns the table ID of the specified database.table
// using the system.namespace table.
func QueryTableID(sqlDB *gosql.DB, dbName, tableName string) (uint32, error) {
tableIDQuery := `
SELECT tables.id FROM system.namespace tables
JOIN system.namespace dbs ON dbs.id = tables.parentid
WHERE dbs.name = $1 AND tables.name = $2
`
var tableID uint32
result := sqlDB.QueryRow(tableIDQuery, dbName, tableName)
if err := result.Scan(&tableID); err != nil {
return 0, err
}
return tableID, nil
}