schema.DBNames = append(schema.DBNames, field.DBName)
				}
				schema.FieldsByDBName[field.DBName] = field
				schema.FieldsByName[field.Name] = field
				schema.FieldsByBindName[bindName] = field

				if v != nil && v.PrimaryKey {
					// remove the existing primary key field
					for idx, f := range schema.PrimaryFields {
						if f.DBName == v.DBName {

										Value:  clause.Column{Table: tableAliasName, Name: ref.ForeignKey.DBName},
									}
								} else {
									if ref.PrimaryValue == "" {
										exprs[idx] = clause.Eq{
											Column: clause.Column{Table: parentTableName, Name: ref.ForeignKey.DBName},
											Value:  clause.Column{Table: tableAliasName, Name: ref.PrimaryKey.DBName},
										}
									} else {

			}
		}

		if !stmt.SkipHooks && stmt.Schema != nil {
			for _, dbName := range stmt.Schema.DBNames {
				field := stmt.Schema.LookUpField(dbName)
				if field.AutoUpdateTime > 0 && value[field.Name] == nil && value[field.DBName] == nil {
					if v, ok := selectColumns[field.DBName]; (ok && v) || !ok {
						now := stmt.DB.NowFunc()
						assignValue(field, now)

			notRestricted = result
			for _, dbName := range stmt.Schema.DBNames {
				results[dbName] = result
			}
		} else if column == clause.Associations {
			for _, rel := range stmt.Schema.Relationships.Relations {
				results[rel.Name] = result
			}
		} else if field := stmt.Schema.LookUpField(column); field != nil && field.DBName != "" {
			results[field.DBName] = result

		{Name: "DeletedAt", DBName: "deleted_at", BindNames: []string{"Model", "DeletedAt"}, Tag: `gorm:"index"`, DataType: schema.Time},
		{Name: "Name", DBName: "name", BindNames: []string{"Name"}, DataType: schema.String},
		{Name: "Age", DBName: "age", BindNames: []string{"Age"}, DataType: schema.Uint, Size: 64},
		{Name: "Birthday", DBName: "birthday", BindNames: []string{"Birthday"}, DataType: schema.Time},

				relForeignKeys = append(relForeignKeys, ref.ForeignKey.DBName)
				relForeignFields = append(relForeignFields, ref.ForeignKey)
				foreignFields = append(foreignFields, ref.PrimaryKey)
			} else if ref.PrimaryValue != "" {
				tx = tx.Where(clause.Eq{Column: ref.ForeignKey.DBName, Value: ref.PrimaryValue})
			} else {
				relForeignKeys = append(relForeignKeys, ref.PrimaryKey.DBName)

								rel = rel.FieldSchema.Relationships.Relations[name]
								relFields = append(relFields, rel.Field)
							}
							// latest name is raw dbname
							dbName := names[subNameCount-1]
							if field := rel.FieldSchema.LookUpField(dbName); field != nil && field.Readable {
								fields[idx] = field

								if len(joinFields) == 0 {
									joinFields = make([][]*schema.Field, len(columns))
								}

			if f.DBName != "" {
				if field, ok := s.FieldsByDBName[f.DBName]; !ok || parsedField != field {
					t.Errorf("schema %v failed to look up field with dbname %v", s, f.DBName)
				}
			}

			for _, name := range []string{f.DBName, f.Name} {
				if name != "" {
					if field := s.LookUpField(name); field == nil || (field.Name != name && field.DBName != name) {

)

var DB *gorm.DB
var (
	mysqlDSN     = "gorm:gorm@tcp(localhost:9910)/gorm?charset=utf8&parseTime=True&loc=Local"
	postgresDSN  = "user=gorm password=gorm dbname=gorm host=localhost port=9920 sslmode=disable TimeZone=Asia/Shanghai"
	gaussdbDSN   = "user=gaussdb password=Gaussdb@123 dbname=gorm host=localhost port=9950 sslmode=disable TimeZone=Asia/Shanghai"
	sqlserverDSN = "sqlserver://sa:LoremIpsum86@localhost:9930?database=master"

				relForeignKeys = append(relForeignKeys, ref.ForeignKey.DBName)
			} else if ref.PrimaryValue != "" {
				conds = append(conds, clause.Eq{
					Column: clause.Column{Table: rel.JoinTable.Table, Name: ref.ForeignKey.DBName},
					Value:  ref.PrimaryValue,
				})
			} else {
				conds = append(conds, clause.Eq{
					Column: clause.Column{Table: rel.JoinTable.Table, Name: ref.ForeignKey.DBName},