mirror of
https://github.com/woodpecker-ci/woodpecker.git
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243 lines
7.7 KiB
Go
243 lines
7.7 KiB
Go
// Copyright 2021 Woodpecker Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package migration
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import (
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"fmt"
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"regexp"
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"strings"
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"xorm.io/xorm"
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"xorm.io/xorm/schemas"
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)
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func renameTable(sess *xorm.Session, old, new string) error {
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dialect := sess.Engine().Dialect().URI().DBType
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switch dialect {
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case schemas.MYSQL:
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_, err := sess.Exec(fmt.Sprintf("RENAME TABLE `%s` TO `%s`;", old, new))
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return err
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case schemas.POSTGRES, schemas.SQLITE:
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_, err := sess.Exec(fmt.Sprintf("ALTER TABLE `%s` RENAME TO `%s`;", old, new))
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return err
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default:
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return fmt.Errorf("dialect '%s' not supported", dialect)
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}
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}
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// WARNING: YOU MUST COMMIT THE SESSION AT THE END
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func dropTableColumns(sess *xorm.Session, tableName string, columnNames ...string) (err error) {
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// Copyright 2017 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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if tableName == "" || len(columnNames) == 0 {
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return nil
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}
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// TODO: This will not work if there are foreign keys
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dialect := sess.Engine().Dialect().URI().DBType
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switch dialect {
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case schemas.SQLITE:
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// First drop the indexes on the columns
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res, errIndex := sess.Query(fmt.Sprintf("PRAGMA index_list(`%s`)", tableName))
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if errIndex != nil {
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return errIndex
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}
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for _, row := range res {
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indexName := row["name"]
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indexRes, err := sess.Query(fmt.Sprintf("PRAGMA index_info(`%s`)", indexName))
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if err != nil {
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return err
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}
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if len(indexRes) != 1 {
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continue
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}
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indexColumn := string(indexRes[0]["name"])
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for _, name := range columnNames {
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if name == indexColumn {
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_, err := sess.Exec(fmt.Sprintf("DROP INDEX `%s`", indexName))
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if err != nil {
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return err
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}
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}
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}
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}
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// Here we need to get the columns from the original table
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sql := fmt.Sprintf("SELECT sql FROM sqlite_master WHERE tbl_name='%s' and type='table'", tableName)
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res, err := sess.Query(sql)
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if err != nil {
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return err
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}
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tableSQL := normalizeSQLiteTableSchema(string(res[0]["sql"]))
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// Separate out the column definitions
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tableSQL = tableSQL[strings.Index(tableSQL, "("):]
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// Remove the required columnNames
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tableSQL = removeColumnFromSQLITETableSchema(tableSQL, columnNames...)
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// Ensure the query is ended properly
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tableSQL = strings.TrimSpace(tableSQL)
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if tableSQL[len(tableSQL)-1] != ')' {
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if tableSQL[len(tableSQL)-1] == ',' {
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tableSQL = tableSQL[:len(tableSQL)-1]
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}
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tableSQL += ")"
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}
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// Find all the columns in the table
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var columns []string
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for _, rawColumn := range strings.Split(strings.ReplaceAll(tableSQL[1:len(tableSQL)-1], ", ", ",\n"), "\n") {
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if strings.ContainsAny(rawColumn, "()") {
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continue
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}
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rawColumn = strings.TrimSpace(rawColumn)
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columns = append(columns,
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strings.ReplaceAll(rawColumn[0:strings.Index(rawColumn, " ")], "`", ""),
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)
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}
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tableSQL = fmt.Sprintf("CREATE TABLE `new_%s_new` ", tableName) + tableSQL
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if _, err := sess.Exec(tableSQL); err != nil {
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return err
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}
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// Now restore the data
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columnsSeparated := strings.Join(columns, ",")
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insertSQL := fmt.Sprintf("INSERT INTO `new_%s_new` (%s) SELECT %s FROM %s", tableName, columnsSeparated, columnsSeparated, tableName)
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if _, err := sess.Exec(insertSQL); err != nil {
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return err
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}
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// Now drop the old table
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if _, err := sess.Exec(fmt.Sprintf("DROP TABLE `%s`", tableName)); err != nil {
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return err
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}
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// Rename the table
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if _, err := sess.Exec(fmt.Sprintf("ALTER TABLE `new_%s_new` RENAME TO `%s`", tableName, tableName)); err != nil {
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return err
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}
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case schemas.POSTGRES:
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cols := ""
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for _, col := range columnNames {
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if cols != "" {
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cols += ", "
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}
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cols += "DROP COLUMN `" + col + "` CASCADE"
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}
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if _, err := sess.Exec(fmt.Sprintf("ALTER TABLE `%s` %s", tableName, cols)); err != nil {
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return fmt.Errorf("drop table `%s` columns %v: %v", tableName, columnNames, err)
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}
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case schemas.MYSQL:
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// Drop indexes on columns first
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sql := fmt.Sprintf("SHOW INDEX FROM %s WHERE column_name IN ('%s')", tableName, strings.Join(columnNames, "','"))
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res, err := sess.Query(sql)
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if err != nil {
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return err
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}
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for _, index := range res {
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indexName := index["column_name"]
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if len(indexName) > 0 {
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_, err := sess.Exec(fmt.Sprintf("DROP INDEX `%s` ON `%s`", indexName, tableName))
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if err != nil {
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return err
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}
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}
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}
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// Now drop the columns
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cols := ""
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for _, col := range columnNames {
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if cols != "" {
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cols += ", "
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}
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cols += "DROP COLUMN `" + col + "`"
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}
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if _, err := sess.Exec(fmt.Sprintf("ALTER TABLE `%s` %s", tableName, cols)); err != nil {
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return fmt.Errorf("drop table `%s` columns %v: %v", tableName, columnNames, err)
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}
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case schemas.MSSQL:
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cols := ""
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for _, col := range columnNames {
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if cols != "" {
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cols += ", "
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}
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cols += "`" + strings.ToLower(col) + "`"
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}
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sql := fmt.Sprintf("SELECT Name FROM sys.default_constraints WHERE parent_object_id = OBJECT_ID('%[1]s') AND parent_column_id IN (SELECT column_id FROM sys.columns WHERE LOWER(name) IN (%[2]s) AND object_id = OBJECT_ID('%[1]s'))",
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tableName, strings.ReplaceAll(cols, "`", "'"))
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constraints := make([]string, 0)
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if err := sess.SQL(sql).Find(&constraints); err != nil {
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return fmt.Errorf("find constraints: %v", err)
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}
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for _, constraint := range constraints {
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if _, err := sess.Exec(fmt.Sprintf("ALTER TABLE `%s` DROP CONSTRAINT `%s`", tableName, constraint)); err != nil {
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return fmt.Errorf("drop table `%s` default constraint `%s`: %v", tableName, constraint, err)
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}
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}
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sql = fmt.Sprintf("SELECT DISTINCT Name FROM sys.indexes INNER JOIN sys.index_columns ON indexes.index_id = index_columns.index_id AND indexes.object_id = index_columns.object_id WHERE indexes.object_id = OBJECT_ID('%[1]s') AND index_columns.column_id IN (SELECT column_id FROM sys.columns WHERE LOWER(name) IN (%[2]s) AND object_id = OBJECT_ID('%[1]s'))",
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tableName, strings.ReplaceAll(cols, "`", "'"))
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constraints = make([]string, 0)
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if err := sess.SQL(sql).Find(&constraints); err != nil {
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return fmt.Errorf("find constraints: %v", err)
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}
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for _, constraint := range constraints {
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if _, err := sess.Exec(fmt.Sprintf("DROP INDEX `%[2]s` ON `%[1]s`", tableName, constraint)); err != nil {
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return fmt.Errorf("drop index `%[2]s` on `%[1]s`: %v", tableName, constraint, err)
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}
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}
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if _, err := sess.Exec(fmt.Sprintf("ALTER TABLE `%s` DROP COLUMN %s", tableName, cols)); err != nil {
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return fmt.Errorf("drop table `%s` columns %v: %v", tableName, columnNames, err)
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}
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default:
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return fmt.Errorf("dialect '%s' not supported", dialect)
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}
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return nil
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}
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var (
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whitespaces = regexp.MustCompile(`\s+`)
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columnSeparator = regexp.MustCompile(`\s?,\s?`)
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)
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func removeColumnFromSQLITETableSchema(schema string, names ...string) string {
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if len(names) == 0 {
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return schema
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}
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for i := range names {
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if len(names[i]) == 0 {
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continue
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}
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schema = regexp.MustCompile(`\s(`+
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regexp.QuoteMeta("`"+names[i]+"`")+
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"|"+
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regexp.QuoteMeta(names[i])+
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")[^`,)]*?[,)]").ReplaceAllString(schema, "")
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}
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return schema
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}
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func normalizeSQLiteTableSchema(schema string) string {
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return columnSeparator.ReplaceAllString(
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whitespaces.ReplaceAllString(
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strings.ReplaceAll(schema, "\n", " "),
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" "),
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", ")
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}
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