mirror of https://github.com/go-gorm/gorm.git
674 lines
19 KiB
Go
674 lines
19 KiB
Go
package migrator
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import (
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"context"
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"database/sql"
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"fmt"
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"reflect"
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"regexp"
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"strings"
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"gorm.io/gorm"
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"gorm.io/gorm/clause"
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"gorm.io/gorm/schema"
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)
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// Migrator m struct
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type Migrator struct {
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Config
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}
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// Config schema config
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type Config struct {
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CreateIndexAfterCreateTable bool
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DB *gorm.DB
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gorm.Dialector
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}
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type GormDataTypeInterface interface {
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GormDBDataType(*gorm.DB, *schema.Field) string
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}
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func (m Migrator) RunWithValue(value interface{}, fc func(*gorm.Statement) error) error {
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stmt := &gorm.Statement{DB: m.DB}
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if m.DB.Statement != nil {
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stmt.Table = m.DB.Statement.Table
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}
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if table, ok := value.(string); ok {
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stmt.Table = table
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} else if err := stmt.Parse(value); err != nil {
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return err
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}
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return fc(stmt)
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}
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func (m Migrator) DataTypeOf(field *schema.Field) string {
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fieldValue := reflect.New(field.IndirectFieldType)
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if dataTyper, ok := fieldValue.Interface().(GormDataTypeInterface); ok {
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if dataType := dataTyper.GormDBDataType(m.DB, field); dataType != "" {
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return dataType
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}
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}
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return m.Dialector.DataTypeOf(field)
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}
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func (m Migrator) FullDataTypeOf(field *schema.Field) (expr clause.Expr) {
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expr.SQL = m.DataTypeOf(field)
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if field.NotNull {
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expr.SQL += " NOT NULL"
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}
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if field.Unique {
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expr.SQL += " UNIQUE"
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}
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if field.HasDefaultValue && (field.DefaultValueInterface != nil || field.DefaultValue != "") {
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if field.DefaultValueInterface != nil {
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defaultStmt := &gorm.Statement{Vars: []interface{}{field.DefaultValueInterface}}
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m.Dialector.BindVarTo(defaultStmt, defaultStmt, field.DefaultValueInterface)
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expr.SQL += " DEFAULT " + m.Dialector.Explain(defaultStmt.SQL.String(), field.DefaultValueInterface)
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} else {
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expr.SQL += " DEFAULT " + field.DefaultValue
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}
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}
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return
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}
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// AutoMigrate
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func (m Migrator) AutoMigrate(values ...interface{}) error {
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for _, value := range m.ReorderModels(values, true) {
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tx := m.DB.Session(&gorm.Session{})
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if !tx.Migrator().HasTable(value) {
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if err := tx.Migrator().CreateTable(value); err != nil {
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return err
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}
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} else {
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if err := m.RunWithValue(value, func(stmt *gorm.Statement) (errr error) {
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columnTypes, _ := m.DB.Migrator().ColumnTypes(value)
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for _, field := range stmt.Schema.FieldsByDBName {
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var foundColumn *sql.ColumnType
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for _, columnType := range columnTypes {
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if columnType.Name() == field.DBName {
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foundColumn = columnType
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break
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}
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}
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if foundColumn == nil {
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// not found, add column
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if err := tx.Migrator().AddColumn(value, field.DBName); err != nil {
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return err
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}
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} else if err := m.DB.Migrator().MigrateColumn(value, field, foundColumn); err != nil {
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// found, smart migrate
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return err
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}
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}
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for _, rel := range stmt.Schema.Relationships.Relations {
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if !m.DB.Config.DisableForeignKeyConstraintWhenMigrating {
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if constraint := rel.ParseConstraint(); constraint != nil {
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if constraint.Schema == stmt.Schema {
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if !tx.Migrator().HasConstraint(value, constraint.Name) {
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if err := tx.Migrator().CreateConstraint(value, constraint.Name); 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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}
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for _, chk := range stmt.Schema.ParseCheckConstraints() {
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if !tx.Migrator().HasConstraint(value, chk.Name) {
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if err := tx.Migrator().CreateConstraint(value, chk.Name); 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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return nil
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}); err != nil {
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return err
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}
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}
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}
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return nil
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}
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func (m Migrator) CreateTable(values ...interface{}) error {
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for _, value := range m.ReorderModels(values, false) {
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tx := m.DB.Session(&gorm.Session{})
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if err := m.RunWithValue(value, func(stmt *gorm.Statement) (errr error) {
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var (
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createTableSQL = "CREATE TABLE ? ("
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values = []interface{}{clause.Table{Name: stmt.Table}}
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hasPrimaryKeyInDataType bool
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)
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for _, dbName := range stmt.Schema.DBNames {
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field := stmt.Schema.FieldsByDBName[dbName]
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createTableSQL += "? ?"
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hasPrimaryKeyInDataType = hasPrimaryKeyInDataType || strings.Contains(strings.ToUpper(string(field.DataType)), "PRIMARY KEY")
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values = append(values, clause.Column{Name: dbName}, m.DB.Migrator().FullDataTypeOf(field))
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createTableSQL += ","
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}
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if !hasPrimaryKeyInDataType && len(stmt.Schema.PrimaryFields) > 0 {
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createTableSQL += "PRIMARY KEY ?,"
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primaryKeys := []interface{}{}
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for _, field := range stmt.Schema.PrimaryFields {
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primaryKeys = append(primaryKeys, clause.Column{Name: field.DBName})
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}
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values = append(values, primaryKeys)
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}
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for _, idx := range stmt.Schema.ParseIndexes() {
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if m.CreateIndexAfterCreateTable {
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defer func(value interface{}, name string) {
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errr = tx.Migrator().CreateIndex(value, name)
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}(value, idx.Name)
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} else {
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if idx.Class != "" {
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createTableSQL += idx.Class + " "
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}
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createTableSQL += "INDEX ? ?,"
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values = append(values, clause.Expr{SQL: idx.Name}, tx.Migrator().(BuildIndexOptionsInterface).BuildIndexOptions(idx.Fields, stmt))
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}
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}
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for _, rel := range stmt.Schema.Relationships.Relations {
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if !m.DB.DisableForeignKeyConstraintWhenMigrating {
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if constraint := rel.ParseConstraint(); constraint != nil {
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if constraint.Schema == stmt.Schema {
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sql, vars := buildConstraint(constraint)
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createTableSQL += sql + ","
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values = append(values, vars...)
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}
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}
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}
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}
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for _, chk := range stmt.Schema.ParseCheckConstraints() {
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createTableSQL += "CONSTRAINT ? CHECK (?),"
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values = append(values, clause.Column{Name: chk.Name}, clause.Expr{SQL: chk.Constraint})
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}
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createTableSQL = strings.TrimSuffix(createTableSQL, ",")
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createTableSQL += ")"
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if tableOption, ok := m.DB.Get("gorm:table_options"); ok {
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createTableSQL += fmt.Sprint(tableOption)
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}
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errr = tx.Exec(createTableSQL, values...).Error
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return errr
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}); err != nil {
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return err
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}
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}
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return nil
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}
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func (m Migrator) DropTable(values ...interface{}) error {
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values = m.ReorderModels(values, false)
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for i := len(values) - 1; i >= 0; i-- {
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tx := m.DB.Session(&gorm.Session{})
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if err := m.RunWithValue(values[i], func(stmt *gorm.Statement) error {
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return tx.Exec("DROP TABLE IF EXISTS ?", clause.Table{Name: stmt.Table}).Error
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}); err != nil {
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return err
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}
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}
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return nil
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}
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func (m Migrator) HasTable(value interface{}) bool {
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var count int64
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m.RunWithValue(value, func(stmt *gorm.Statement) error {
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currentDatabase := m.DB.Migrator().CurrentDatabase()
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return m.DB.Raw("SELECT count(*) FROM information_schema.tables WHERE table_schema = ? AND table_name = ? AND table_type = ?", currentDatabase, stmt.Table, "BASE TABLE").Row().Scan(&count)
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})
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return count > 0
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}
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func (m Migrator) RenameTable(oldName, newName interface{}) error {
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var oldTable, newTable string
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if v, ok := oldName.(string); ok {
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oldTable = v
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} else {
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stmt := &gorm.Statement{DB: m.DB}
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if err := stmt.Parse(oldName); err == nil {
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oldTable = stmt.Table
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} else {
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return err
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}
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}
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if v, ok := newName.(string); ok {
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newTable = v
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} else {
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stmt := &gorm.Statement{DB: m.DB}
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if err := stmt.Parse(newName); err == nil {
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newTable = stmt.Table
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} else {
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return err
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}
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}
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return m.DB.Exec("ALTER TABLE ? RENAME TO ?", clause.Table{Name: oldTable}, clause.Table{Name: newTable}).Error
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}
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func (m Migrator) AddColumn(value interface{}, field string) error {
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return m.RunWithValue(value, func(stmt *gorm.Statement) error {
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if field := stmt.Schema.LookUpField(field); field != nil {
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return m.DB.Exec(
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"ALTER TABLE ? ADD ? ?",
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clause.Table{Name: stmt.Table}, clause.Column{Name: field.DBName}, m.DB.Migrator().FullDataTypeOf(field),
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).Error
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}
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return fmt.Errorf("failed to look up field with name: %s", field)
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})
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}
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func (m Migrator) DropColumn(value interface{}, name string) error {
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return m.RunWithValue(value, func(stmt *gorm.Statement) error {
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if field := stmt.Schema.LookUpField(name); field != nil {
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name = field.DBName
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}
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return m.DB.Exec(
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"ALTER TABLE ? DROP COLUMN ?", clause.Table{Name: stmt.Table}, clause.Column{Name: name},
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).Error
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})
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}
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func (m Migrator) AlterColumn(value interface{}, field string) error {
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return m.RunWithValue(value, func(stmt *gorm.Statement) error {
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if field := stmt.Schema.LookUpField(field); field != nil {
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fileType := clause.Expr{SQL: m.DataTypeOf(field)}
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return m.DB.Exec(
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"ALTER TABLE ? ALTER COLUMN ? TYPE ?",
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clause.Table{Name: stmt.Table}, clause.Column{Name: field.DBName}, fileType,
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).Error
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}
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return fmt.Errorf("failed to look up field with name: %s", field)
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})
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}
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func (m Migrator) HasColumn(value interface{}, field string) bool {
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var count int64
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m.RunWithValue(value, func(stmt *gorm.Statement) error {
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currentDatabase := m.DB.Migrator().CurrentDatabase()
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name := field
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if field := stmt.Schema.LookUpField(field); field != nil {
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name = field.DBName
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}
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return m.DB.Raw(
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"SELECT count(*) FROM INFORMATION_SCHEMA.columns WHERE table_schema = ? AND table_name = ? AND column_name = ?",
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currentDatabase, stmt.Table, name,
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).Row().Scan(&count)
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})
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return count > 0
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}
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func (m Migrator) RenameColumn(value interface{}, oldName, newName string) error {
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return m.RunWithValue(value, func(stmt *gorm.Statement) error {
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if field := stmt.Schema.LookUpField(oldName); field != nil {
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oldName = field.DBName
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}
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if field := stmt.Schema.LookUpField(newName); field != nil {
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newName = field.DBName
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}
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return m.DB.Exec(
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"ALTER TABLE ? RENAME COLUMN ? TO ?",
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clause.Table{Name: stmt.Table}, clause.Column{Name: oldName}, clause.Column{Name: newName},
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).Error
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})
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}
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func (m Migrator) MigrateColumn(value interface{}, field *schema.Field, columnType *sql.ColumnType) error {
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// found, smart migrate
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fullDataType := strings.ToLower(m.DB.Migrator().FullDataTypeOf(field).SQL)
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realDataType := strings.ToLower(columnType.DatabaseTypeName())
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alterColumn := false
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// check size
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if length, _ := columnType.Length(); length != int64(field.Size) {
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if length > 0 && field.Size > 0 {
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alterColumn = true
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} else {
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// has size in data type and not equal
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matches := regexp.MustCompile(`[^\d](\d+)[^\d]`).FindAllStringSubmatch(realDataType, -1)
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matches2 := regexp.MustCompile(`[^\d]*(\d+)[^\d]`).FindAllStringSubmatch(fullDataType, -1)
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if (len(matches) == 1 && matches[0][1] != fmt.Sprint(field.Size)) && (len(matches2) == 1 && matches2[0][1] != fmt.Sprint(length)) {
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alterColumn = true
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}
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}
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}
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// check precision
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if precision, _, ok := columnType.DecimalSize(); ok && int64(field.Precision) != precision {
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if strings.Contains(fullDataType, fmt.Sprint(field.Precision)) {
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alterColumn = true
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}
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}
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// check nullable
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if nullable, ok := columnType.Nullable(); ok && nullable == field.NotNull {
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// not primary key & database is nullable
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if !field.PrimaryKey && nullable {
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alterColumn = true
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}
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}
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if alterColumn {
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return m.DB.Migrator().AlterColumn(value, field.Name)
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}
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return nil
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}
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func (m Migrator) ColumnTypes(value interface{}) (columnTypes []*sql.ColumnType, err error) {
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err = m.RunWithValue(value, func(stmt *gorm.Statement) error {
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rows, err := m.DB.Session(&gorm.Session{}).Raw("select * from ?", clause.Table{Name: stmt.Table}).Rows()
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if err == nil {
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columnTypes, err = rows.ColumnTypes()
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}
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return err
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})
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return
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}
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func (m Migrator) CreateView(name string, option gorm.ViewOption) error {
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return gorm.ErrNotImplemented
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}
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func (m Migrator) DropView(name string) error {
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return gorm.ErrNotImplemented
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}
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func buildConstraint(constraint *schema.Constraint) (sql string, results []interface{}) {
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sql = "CONSTRAINT ? FOREIGN KEY ? REFERENCES ??"
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if constraint.OnDelete != "" {
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sql += " ON DELETE " + constraint.OnDelete
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}
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if constraint.OnUpdate != "" {
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sql += " ON UPDATE " + constraint.OnUpdate
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}
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var foreignKeys, references []interface{}
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for _, field := range constraint.ForeignKeys {
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foreignKeys = append(foreignKeys, clause.Column{Name: field.DBName})
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}
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for _, field := range constraint.References {
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references = append(references, clause.Column{Name: field.DBName})
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}
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results = append(results, clause.Table{Name: constraint.Name}, foreignKeys, clause.Table{Name: constraint.ReferenceSchema.Table}, references)
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return
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}
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func (m Migrator) CreateConstraint(value interface{}, name string) error {
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return m.RunWithValue(value, func(stmt *gorm.Statement) error {
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checkConstraints := stmt.Schema.ParseCheckConstraints()
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if chk, ok := checkConstraints[name]; ok {
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return m.DB.Exec(
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"ALTER TABLE ? ADD CONSTRAINT ? CHECK (?)",
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clause.Table{Name: stmt.Table}, clause.Column{Name: chk.Name}, clause.Expr{SQL: chk.Constraint},
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).Error
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}
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for _, rel := range stmt.Schema.Relationships.Relations {
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if constraint := rel.ParseConstraint(); constraint != nil && constraint.Name == name {
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sql, values := buildConstraint(constraint)
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return m.DB.Exec("ALTER TABLE ? ADD "+sql, append([]interface{}{clause.Table{Name: stmt.Table}}, values...)...).Error
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}
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}
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err := fmt.Errorf("failed to create constraint with name %v", name)
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if field := stmt.Schema.LookUpField(name); field != nil {
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for _, cc := range checkConstraints {
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if err = m.DB.Migrator().CreateIndex(value, cc.Name); err != nil {
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return err
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}
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}
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for _, rel := range stmt.Schema.Relationships.Relations {
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if constraint := rel.ParseConstraint(); constraint != nil && constraint.Field == field {
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if err = m.DB.Migrator().CreateIndex(value, constraint.Name); 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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return err
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})
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}
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func (m Migrator) DropConstraint(value interface{}, name string) error {
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return m.RunWithValue(value, func(stmt *gorm.Statement) error {
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return m.DB.Exec(
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"ALTER TABLE ? DROP CONSTRAINT ?",
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clause.Table{Name: stmt.Table}, clause.Column{Name: name},
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).Error
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})
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}
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func (m Migrator) HasConstraint(value interface{}, name string) bool {
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var count int64
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m.RunWithValue(value, func(stmt *gorm.Statement) error {
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currentDatabase := m.DB.Migrator().CurrentDatabase()
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return m.DB.Raw(
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"SELECT count(*) FROM INFORMATION_SCHEMA.table_constraints WHERE constraint_schema = ? AND table_name = ? AND constraint_name = ?",
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currentDatabase, stmt.Table, name,
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).Row().Scan(&count)
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})
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return count > 0
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}
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func (m Migrator) BuildIndexOptions(opts []schema.IndexOption, stmt *gorm.Statement) (results []interface{}) {
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for _, opt := range opts {
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str := stmt.Quote(opt.DBName)
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if opt.Expression != "" {
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str = opt.Expression
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} else if opt.Length > 0 {
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str += fmt.Sprintf("(%d)", opt.Length)
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}
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if opt.Collate != "" {
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str += " COLLATE " + opt.Collate
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}
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if opt.Sort != "" {
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str += " " + opt.Sort
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}
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results = append(results, clause.Expr{SQL: str})
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}
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return
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}
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type BuildIndexOptionsInterface interface {
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BuildIndexOptions([]schema.IndexOption, *gorm.Statement) []interface{}
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}
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func (m Migrator) CreateIndex(value interface{}, name string) error {
|
|
return m.RunWithValue(value, func(stmt *gorm.Statement) error {
|
|
if idx := stmt.Schema.LookIndex(name); idx != nil {
|
|
opts := m.DB.Migrator().(BuildIndexOptionsInterface).BuildIndexOptions(idx.Fields, stmt)
|
|
values := []interface{}{clause.Column{Name: idx.Name}, clause.Table{Name: stmt.Table}, opts}
|
|
|
|
createIndexSQL := "CREATE "
|
|
if idx.Class != "" {
|
|
createIndexSQL += idx.Class + " "
|
|
}
|
|
createIndexSQL += "INDEX ? ON ??"
|
|
|
|
if idx.Type != "" {
|
|
createIndexSQL += " USING " + idx.Type
|
|
}
|
|
|
|
return m.DB.Exec(createIndexSQL, values...).Error
|
|
}
|
|
|
|
return fmt.Errorf("failed to create index with name %v", name)
|
|
})
|
|
}
|
|
|
|
func (m Migrator) DropIndex(value interface{}, name string) error {
|
|
return m.RunWithValue(value, func(stmt *gorm.Statement) error {
|
|
if idx := stmt.Schema.LookIndex(name); idx != nil {
|
|
name = idx.Name
|
|
}
|
|
|
|
return m.DB.Exec("DROP INDEX ? ON ?", clause.Column{Name: name}, clause.Table{Name: stmt.Table}).Error
|
|
})
|
|
}
|
|
|
|
func (m Migrator) HasIndex(value interface{}, name string) bool {
|
|
var count int64
|
|
m.RunWithValue(value, func(stmt *gorm.Statement) error {
|
|
currentDatabase := m.DB.Migrator().CurrentDatabase()
|
|
if idx := stmt.Schema.LookIndex(name); idx != nil {
|
|
name = idx.Name
|
|
}
|
|
|
|
return m.DB.Raw(
|
|
"SELECT count(*) FROM information_schema.statistics WHERE table_schema = ? AND table_name = ? AND index_name = ?",
|
|
currentDatabase, stmt.Table, name,
|
|
).Row().Scan(&count)
|
|
})
|
|
|
|
return count > 0
|
|
}
|
|
|
|
func (m Migrator) RenameIndex(value interface{}, oldName, newName string) error {
|
|
return m.RunWithValue(value, func(stmt *gorm.Statement) error {
|
|
return m.DB.Exec(
|
|
"ALTER TABLE ? RENAME INDEX ? TO ?",
|
|
clause.Table{Name: stmt.Table}, clause.Column{Name: oldName}, clause.Column{Name: newName},
|
|
).Error
|
|
})
|
|
}
|
|
|
|
func (m Migrator) CurrentDatabase() (name string) {
|
|
m.DB.Raw("SELECT DATABASE()").Row().Scan(&name)
|
|
return
|
|
}
|
|
|
|
// ReorderModels reorder models according to constraint dependencies
|
|
func (m Migrator) ReorderModels(values []interface{}, autoAdd bool) (results []interface{}) {
|
|
type Dependency struct {
|
|
*gorm.Statement
|
|
Depends []*schema.Schema
|
|
}
|
|
|
|
var (
|
|
modelNames, orderedModelNames []string
|
|
orderedModelNamesMap = map[string]bool{}
|
|
parsedSchemas = map[*schema.Schema]bool{}
|
|
valuesMap = map[string]Dependency{}
|
|
insertIntoOrderedList func(name string)
|
|
parseDependence func(value interface{}, addToList bool)
|
|
)
|
|
|
|
parseDependence = func(value interface{}, addToList bool) {
|
|
dep := Dependency{
|
|
Statement: &gorm.Statement{DB: m.DB, Dest: value},
|
|
}
|
|
beDependedOn := map[*schema.Schema]bool{}
|
|
if err := dep.Parse(value); err != nil {
|
|
m.DB.Logger.Error(context.Background(), "failed to parse value %#v, got error %v", value, err)
|
|
}
|
|
if _, ok := parsedSchemas[dep.Statement.Schema]; ok {
|
|
return
|
|
}
|
|
parsedSchemas[dep.Statement.Schema] = true
|
|
|
|
for _, rel := range dep.Schema.Relationships.Relations {
|
|
if c := rel.ParseConstraint(); c != nil && c.Schema == dep.Statement.Schema && c.Schema != c.ReferenceSchema {
|
|
dep.Depends = append(dep.Depends, c.ReferenceSchema)
|
|
}
|
|
|
|
if rel.Type == schema.HasOne || rel.Type == schema.HasMany {
|
|
beDependedOn[rel.FieldSchema] = true
|
|
}
|
|
|
|
if rel.JoinTable != nil {
|
|
// append join value
|
|
defer func(rel *schema.Relationship, joinValue interface{}) {
|
|
if !beDependedOn[rel.FieldSchema] {
|
|
dep.Depends = append(dep.Depends, rel.FieldSchema)
|
|
} else {
|
|
fieldValue := reflect.New(rel.FieldSchema.ModelType).Interface()
|
|
parseDependence(fieldValue, autoAdd)
|
|
}
|
|
parseDependence(joinValue, autoAdd)
|
|
}(rel, reflect.New(rel.JoinTable.ModelType).Interface())
|
|
}
|
|
}
|
|
|
|
valuesMap[dep.Schema.Table] = dep
|
|
|
|
if addToList {
|
|
modelNames = append(modelNames, dep.Schema.Table)
|
|
}
|
|
}
|
|
|
|
insertIntoOrderedList = func(name string) {
|
|
if _, ok := orderedModelNamesMap[name]; ok {
|
|
return // avoid loop
|
|
}
|
|
orderedModelNamesMap[name] = true
|
|
|
|
dep := valuesMap[name]
|
|
for _, d := range dep.Depends {
|
|
if _, ok := valuesMap[d.Table]; ok {
|
|
insertIntoOrderedList(d.Table)
|
|
} else if autoAdd {
|
|
parseDependence(reflect.New(d.ModelType).Interface(), autoAdd)
|
|
insertIntoOrderedList(d.Table)
|
|
}
|
|
}
|
|
|
|
orderedModelNames = append(orderedModelNames, name)
|
|
}
|
|
|
|
for _, value := range values {
|
|
if v, ok := value.(string); ok {
|
|
results = append(results, v)
|
|
} else {
|
|
parseDependence(value, true)
|
|
}
|
|
}
|
|
|
|
for _, name := range modelNames {
|
|
insertIntoOrderedList(name)
|
|
}
|
|
|
|
for _, name := range orderedModelNames {
|
|
results = append(results, valuesMap[name].Statement.Dest)
|
|
}
|
|
return
|
|
}
|