mirror of
https://github.com/go-gitea/gitea.git
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fff32e9469
Migrations should never use model structs directly, because the model structs can be different in different releases. e.g. if one migration uses "User" model, it works in the early releases, then one day, when the User model changes, the migration breaks because it will use the new (incorrect) User model, it should only use the old User model. The same to "modules/structs". --------- Signed-off-by: wxiaoguang <wxiaoguang@gmail.com> Co-authored-by: delvh <dev.lh@web.de>
522 lines
19 KiB
Go
522 lines
19 KiB
Go
// Copyright 2022 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package base
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import (
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"context"
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"errors"
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"fmt"
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"reflect"
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"regexp"
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"strings"
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"gitea.dev/models/db"
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"gitea.dev/modules/log"
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"gitea.dev/modules/setting"
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"xorm.io/xorm/schemas"
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)
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// Migrations should never use model structs directly, because the model structs can be different in different releases.
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// e.g. if one migration uses "User" model, it works in the early releases, then one day,
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// when the User model changes, the migration breaks because it will use the new (incorrect) User model,
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// it should only use the old User model. The same to "modules/structs".
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// However, many the existing migrations already abuses "modules/structs" (search "gitea.dev/models/" in the migrations).
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// TODO: need to fully decouple the migration package and models & structs package
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type (
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EngineMigration = db.EngineMigration
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Session = db.Session
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)
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// RecreateTables will recreate the tables for the provided beans using the newly provided bean definition and move all data to that new table
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// WARNING: YOU MUST PROVIDE THE FULL BEAN DEFINITION
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func RecreateTables(beans ...any) func(EngineMigration) error {
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return func(x EngineMigration) error {
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sess := x.NewSession()
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defer sess.Close()
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if err := sess.Begin(); err != nil {
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return err
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}
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sess = sess.StoreEngine("InnoDB")
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for _, bean := range beans {
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log.Info("Recreating Table: %s for Bean: %s", x.TableName(bean), reflect.Indirect(reflect.ValueOf(bean)).Type().Name())
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if err := RecreateTable(sess, bean); err != nil {
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return err
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}
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}
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return sess.Commit()
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}
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}
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// RecreateTable will recreate the table using the newly provided bean definition and move all data to that new table
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// WARNING: YOU MUST PROVIDE THE FULL BEAN DEFINITION
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// WARNING: YOU MUST COMMIT THE SESSION AT THE END
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func RecreateTable(sess Session, bean any) error {
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// TODO: This will not work if there are foreign keys
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tableName := sess.Engine().TableName(bean)
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tempTableName := "tmp_recreate__" + tableName
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// We need to move the old table away and create a new one with the correct columns
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// We will need to do this in stages to prevent data loss
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//
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// First create the temporary table
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if err := sess.Table(tempTableName).CreateTable(bean); err != nil {
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log.Error("Unable to create table %s. Error: %v", tempTableName, err)
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return err
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}
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if err := sess.Table(tempTableName).CreateUniques(bean); err != nil {
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log.Error("Unable to create uniques for table %s. Error: %v", tempTableName, err)
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return err
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}
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if err := sess.Table(tempTableName).CreateIndexes(bean); err != nil {
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log.Error("Unable to create indexes for table %s. Error: %v", tempTableName, err)
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return err
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}
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// Work out the column names from the bean - these are the columns to select from the old table and install into the new table
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table, err := sess.Engine().TableInfo(bean)
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if err != nil {
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log.Error("Unable to get table info. Error: %v", err)
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return err
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}
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newTableColumns := table.Columns()
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if len(newTableColumns) == 0 {
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return errors.New("no columns in new table")
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}
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hasID := false
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for _, column := range newTableColumns {
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hasID = hasID || (column.IsPrimaryKey && column.IsAutoIncrement)
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}
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if hasID && setting.Database.Type.IsMSSQL() {
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if _, err := sess.Exec(fmt.Sprintf("SET IDENTITY_INSERT `%s` ON", tempTableName)); err != nil {
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log.Error("Unable to set identity insert for table %s. Error: %v", tempTableName, err)
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return err
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}
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}
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sqlStringBuilder := &strings.Builder{}
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_, _ = sqlStringBuilder.WriteString("INSERT INTO `")
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_, _ = sqlStringBuilder.WriteString(tempTableName)
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_, _ = sqlStringBuilder.WriteString("` (`")
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_, _ = sqlStringBuilder.WriteString(newTableColumns[0].Name)
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_, _ = sqlStringBuilder.WriteString("`")
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for _, column := range newTableColumns[1:] {
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_, _ = sqlStringBuilder.WriteString(", `")
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_, _ = sqlStringBuilder.WriteString(column.Name)
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_, _ = sqlStringBuilder.WriteString("`")
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}
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_, _ = sqlStringBuilder.WriteString(")")
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_, _ = sqlStringBuilder.WriteString(" SELECT ")
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if newTableColumns[0].Default != "" {
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_, _ = sqlStringBuilder.WriteString("COALESCE(`")
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_, _ = sqlStringBuilder.WriteString(newTableColumns[0].Name)
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_, _ = sqlStringBuilder.WriteString("`, ")
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_, _ = sqlStringBuilder.WriteString(newTableColumns[0].Default)
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_, _ = sqlStringBuilder.WriteString(")")
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} else {
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_, _ = sqlStringBuilder.WriteString("`")
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_, _ = sqlStringBuilder.WriteString(newTableColumns[0].Name)
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_, _ = sqlStringBuilder.WriteString("`")
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}
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for _, column := range newTableColumns[1:] {
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if column.Default != "" {
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_, _ = sqlStringBuilder.WriteString(", COALESCE(`")
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_, _ = sqlStringBuilder.WriteString(column.Name)
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_, _ = sqlStringBuilder.WriteString("`, ")
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_, _ = sqlStringBuilder.WriteString(column.Default)
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_, _ = sqlStringBuilder.WriteString(")")
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} else {
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_, _ = sqlStringBuilder.WriteString(", `")
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_, _ = sqlStringBuilder.WriteString(column.Name)
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_, _ = sqlStringBuilder.WriteString("`")
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}
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}
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_, _ = sqlStringBuilder.WriteString(" FROM `")
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_, _ = sqlStringBuilder.WriteString(tableName)
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_, _ = sqlStringBuilder.WriteString("`")
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if _, err := sess.Exec(sqlStringBuilder.String()); err != nil {
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log.Error("Unable to set copy data in to temp table %s. Error: %v", tempTableName, err)
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return err
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}
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if hasID && setting.Database.Type.IsMSSQL() {
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if _, err := sess.Exec(fmt.Sprintf("SET IDENTITY_INSERT `%s` OFF", tempTableName)); err != nil {
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log.Error("Unable to switch off identity insert for table %s. Error: %v", tempTableName, err)
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return err
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}
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}
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switch {
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case setting.Database.Type.IsSQLite3():
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// SQLite will drop all the constraints on the old table
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if _, err := sess.Exec(fmt.Sprintf("DROP TABLE `%s`", tableName)); err != nil {
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log.Error("Unable to drop old table %s. Error: %v", tableName, err)
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return err
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}
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if err := sess.Table(tempTableName).DropIndexes(bean); err != nil {
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log.Error("Unable to drop indexes on temporary table %s. Error: %v", tempTableName, err)
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return err
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}
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if _, err := sess.Exec(fmt.Sprintf("ALTER TABLE `%s` RENAME TO `%s`", tempTableName, tableName)); err != nil {
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log.Error("Unable to rename %s to %s. Error: %v", tempTableName, tableName, err)
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return err
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}
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if err := sess.Table(tableName).CreateIndexes(bean); err != nil {
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log.Error("Unable to recreate indexes on table %s. Error: %v", tableName, err)
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return err
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}
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if err := sess.Table(tableName).CreateUniques(bean); err != nil {
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log.Error("Unable to recreate uniques on table %s. Error: %v", tableName, err)
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return err
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}
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case setting.Database.Type.IsMySQL():
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// MySQL will drop all the constraints on the old table
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if _, err := sess.Exec(fmt.Sprintf("DROP TABLE `%s`", tableName)); err != nil {
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log.Error("Unable to drop old table %s. Error: %v", tableName, err)
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return err
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}
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if err := sess.Table(tempTableName).DropIndexes(bean); err != nil {
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log.Error("Unable to drop indexes on temporary table %s. Error: %v", tempTableName, err)
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return err
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}
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// SQLite and MySQL will move all the constraints from the temporary table to the new table
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if _, err := sess.Exec(fmt.Sprintf("ALTER TABLE `%s` RENAME TO `%s`", tempTableName, tableName)); err != nil {
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log.Error("Unable to rename %s to %s. Error: %v", tempTableName, tableName, err)
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return err
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}
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if err := sess.Table(tableName).CreateIndexes(bean); err != nil {
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log.Error("Unable to recreate indexes on table %s. Error: %v", tableName, err)
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return err
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}
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if err := sess.Table(tableName).CreateUniques(bean); err != nil {
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log.Error("Unable to recreate uniques on table %s. Error: %v", tableName, err)
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return err
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}
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case setting.Database.Type.IsPostgreSQL():
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var originalSequences []string
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type sequenceData struct {
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LastValue int `xorm:"'last_value'"`
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IsCalled bool `xorm:"'is_called'"`
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}
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sequenceMap := map[string]sequenceData{}
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schema := sess.Engine().Dialect().URI().Schema
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sess.Engine().SetSchema("")
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if err := sess.Table("information_schema.sequences").Cols("sequence_name").Where("sequence_name LIKE ? || '_%' AND sequence_catalog = ?", tableName, setting.Database.Name).Find(&originalSequences); err != nil {
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log.Error("Unable to rename %s to %s. Error: %v", tempTableName, tableName, err)
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return err
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}
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sess.Engine().SetSchema(schema)
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for _, sequence := range originalSequences {
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sequenceData := sequenceData{}
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if _, err := sess.Table(sequence).Cols("last_value", "is_called").Get(&sequenceData); err != nil {
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log.Error("Unable to get last_value and is_called from %s. Error: %v", sequence, err)
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return err
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}
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sequenceMap[sequence] = sequenceData
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}
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// CASCADE causes postgres to drop all the constraints on the old table
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if _, err := sess.Exec(fmt.Sprintf("DROP TABLE `%s` CASCADE", tableName)); err != nil {
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log.Error("Unable to drop old table %s. Error: %v", tableName, err)
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return err
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}
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// CASCADE causes postgres to move all the constraints from the temporary table to the new table
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if _, err := sess.Exec(fmt.Sprintf("ALTER TABLE `%s` RENAME TO `%s`", tempTableName, tableName)); err != nil {
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log.Error("Unable to rename %s to %s. Error: %v", tempTableName, tableName, err)
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return err
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}
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var indices []string
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sess.Engine().SetSchema("")
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if err := sess.Table("pg_indexes").Cols("indexname").Where("tablename = ? ", tableName).Find(&indices); err != nil {
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log.Error("Unable to rename %s to %s. Error: %v", tempTableName, tableName, err)
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return err
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}
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sess.Engine().SetSchema(schema)
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for _, index := range indices {
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newIndexName := strings.Replace(index, "tmp_recreate__", "", 1)
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if _, err := sess.Exec(fmt.Sprintf("ALTER INDEX `%s` RENAME TO `%s`", index, newIndexName)); err != nil {
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log.Error("Unable to rename %s to %s. Error: %v", index, newIndexName, err)
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return err
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}
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}
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var sequences []string
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sess.Engine().SetSchema("")
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if err := sess.Table("information_schema.sequences").Cols("sequence_name").Where("sequence_name LIKE 'tmp_recreate__' || ? || '_%' AND sequence_catalog = ?", tableName, setting.Database.Name).Find(&sequences); err != nil {
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log.Error("Unable to rename %s to %s. Error: %v", tempTableName, tableName, err)
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return err
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}
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sess.Engine().SetSchema(schema)
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for _, sequence := range sequences {
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newSequenceName := strings.Replace(sequence, "tmp_recreate__", "", 1)
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if _, err := sess.Exec(fmt.Sprintf("ALTER SEQUENCE `%s` RENAME TO `%s`", sequence, newSequenceName)); err != nil {
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log.Error("Unable to rename %s sequence to %s. Error: %v", sequence, newSequenceName, err)
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return err
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}
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val, ok := sequenceMap[newSequenceName]
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if newSequenceName == tableName+"_id_seq" {
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if ok && val.LastValue != 0 {
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if _, err := sess.Exec(fmt.Sprintf("SELECT setval('%s', %d, %t)", newSequenceName, val.LastValue, val.IsCalled)); err != nil {
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log.Error("Unable to reset %s to %d. Error: %v", newSequenceName, val, err)
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return err
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}
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} else {
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// We're going to try to guess this
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if _, err := sess.Exec(fmt.Sprintf("SELECT setval('%s', COALESCE((SELECT MAX(id)+1 FROM `%s`), 1), false)", newSequenceName, tableName)); err != nil {
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log.Error("Unable to reset %s. Error: %v", newSequenceName, err)
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return err
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}
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}
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} else if ok {
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if _, err := sess.Exec(fmt.Sprintf("SELECT setval('%s', %d, %t)", newSequenceName, val.LastValue, val.IsCalled)); err != nil {
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log.Error("Unable to reset %s to %d. Error: %v", newSequenceName, val, err)
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return err
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}
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}
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}
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case setting.Database.Type.IsMSSQL():
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// MSSQL will drop all the constraints on the old table
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if _, err := sess.Exec(fmt.Sprintf("DROP TABLE `%s`", tableName)); err != nil {
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log.Error("Unable to drop old table %s. Error: %v", tableName, err)
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return err
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}
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// MSSQL sp_rename will move all the constraints from the temporary table to the new table
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if _, err := sess.Exec(fmt.Sprintf("sp_rename `%s`,`%s`", tempTableName, tableName)); err != nil {
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log.Error("Unable to rename %s to %s. Error: %v", tempTableName, tableName, err)
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return err
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}
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default:
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log.Fatal("Unrecognized DB")
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}
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return nil
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}
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// WARNING: YOU MUST COMMIT THE SESSION AT THE END
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func DropTableColumns(sess Session, tableName string, columnNames ...string) (err error) {
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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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switch {
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case setting.Database.Type.IsSQLite3():
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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 := string(res[0]["sql"])
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// Get the string offset for column definitions: `CREATE TABLE ( column-definitions... )`
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columnDefinitionsIndex := strings.Index(tableSQL, "(")
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if columnDefinitionsIndex < 0 {
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return errors.New("couldn't find column definitions")
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}
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// Separate out the column definitions
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tableSQL = tableSQL[columnDefinitionsIndex:]
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// Remove the required columnNames
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for _, name := range columnNames {
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tableSQL = regexp.MustCompile(regexp.QuoteMeta("`"+name+"`")+"[^`,)]*?[,)]").ReplaceAllString(tableSQL, "")
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}
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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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columns := regexp.MustCompile("`([^`]*)`").FindAllString(tableSQL, -1)
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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 setting.Database.Type.IsPostgreSQL():
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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: %w", tableName, columnNames, err)
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}
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case setting.Database.Type.IsMySQL():
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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: %w", tableName, columnNames, err)
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}
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case setting.Database.Type.IsMSSQL():
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cols := ""
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for _, col := range columnNames {
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if cols != "" {
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cols += ", "
|
|
}
|
|
cols += "`" + strings.ToLower(col) + "`"
|
|
}
|
|
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'))",
|
|
tableName, strings.ReplaceAll(cols, "`", "'"))
|
|
constraints := make([]string, 0)
|
|
if err := sess.SQL(sql).Find(&constraints); err != nil {
|
|
return fmt.Errorf("find constraints: %w", err)
|
|
}
|
|
for _, constraint := range constraints {
|
|
if _, err := sess.Exec(fmt.Sprintf("ALTER TABLE `%s` DROP CONSTRAINT `%s`", tableName, constraint)); err != nil {
|
|
return fmt.Errorf("drop table `%s` default constraint `%s`: %w", tableName, constraint, err)
|
|
}
|
|
}
|
|
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'))",
|
|
tableName, strings.ReplaceAll(cols, "`", "'"))
|
|
constraints = make([]string, 0)
|
|
if err := sess.SQL(sql).Find(&constraints); err != nil {
|
|
return fmt.Errorf("find constraints: %w", err)
|
|
}
|
|
for _, constraint := range constraints {
|
|
if _, err := sess.Exec(fmt.Sprintf("DROP INDEX `%[2]s` ON `%[1]s`", tableName, constraint)); err != nil {
|
|
return fmt.Errorf("drop index `%[2]s` on `%[1]s`: %[3]w", tableName, constraint, err)
|
|
}
|
|
}
|
|
|
|
if _, err := sess.Exec(fmt.Sprintf("ALTER TABLE `%s` DROP COLUMN %s", tableName, cols)); err != nil {
|
|
return fmt.Errorf("drop table `%s` columns %v: %w", tableName, columnNames, err)
|
|
}
|
|
default:
|
|
log.Fatal("Unrecognized DB")
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// ModifyColumn will modify column's type or other property. SQLITE is not supported
|
|
func ModifyColumn(x EngineMigration, tableName string, col *schemas.Column) error {
|
|
var indexes map[string]*schemas.Index
|
|
var err error
|
|
// MSSQL have to remove index at first, otherwise alter column will fail
|
|
// ref. https://sqlzealots.com/2018/05/09/error-message-the-index-is-dependent-on-column-alter-table-alter-column-failed-because-one-or-more-objects-access-this-column/
|
|
if x.Dialect().URI().DBType == schemas.MSSQL {
|
|
indexes, err = x.Dialect().GetIndexes(x.DB(), context.Background(), tableName)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
for _, index := range indexes {
|
|
_, err = x.Exec(x.Dialect().DropIndexSQL(tableName, index))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
|
|
defer func() {
|
|
for _, index := range indexes {
|
|
_, err = x.Exec(x.Dialect().CreateIndexSQL(tableName, index))
|
|
if err != nil {
|
|
log.Error("Create index %s on table %s failed: %v", index.Name, tableName, err)
|
|
}
|
|
}
|
|
}()
|
|
|
|
alterSQL := x.Dialect().ModifyColumnSQL(tableName, col)
|
|
if _, err := x.Exec(alterSQL); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|