"errors"
	"math"
	"strings"
	"testing"
	"time"
)

func TestIsInvalidDBNameChar(t *testing.T) {
	for _, db := range []string{"db", "dbName", "db_name", "db1", "1dbname", "db$name"} {
		if fields := strings.FieldsFunc(db, IsInvalidDBNameChar); len(fields) != 1 {
			t.Fatalf("failed to parse db name %v", db)
		}
	}
}

func TestCheckTruth(t *testing.T) {
	checkTruthTests := []struct {
		v   string
		out bool
	}{

	QueryRowContext(ctx context.Context, query string, args ...interface{}) *sql.Row
}

// SavePointerDialectorInterface save pointer interface
type SavePointerDialectorInterface interface {
	SavePoint(tx *DB, name string) error
	RollbackTo(tx *DB, name string) error
}

// TxBeginner tx beginner
type TxBeginner interface {
	BeginTx(ctx context.Context, opts *sql.TxOptions) (*sql.Tx, error)
}

// ConnPoolBeginner conn pool beginner

					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 {

			}
		}

		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

			}

			for _, field := range stmt.Schema.FieldsWithDefaultDBValue {
				if v, ok := selectColumns[field.DBName]; (ok && v) || (!ok && !restricted) && field.DefaultValueInterface == nil {
					if rvOfvalue, isZero := field.ValueOf(stmt.Context, stmt.ReflectValue); !isZero {
						values.Columns = append(values.Columns, clause.Column{Name: field.DBName})
						values.Values[0] = append(values.Values[0], rvOfvalue)
					}
				}
			}
		default:

				)
				for _, dbName := range stmt.Schema.DBNames {
					var foundColumn gorm.ColumnType

					for _, columnType := range columnTypes {
						if columnType.Name() == dbName {
							foundColumn = columnType
							break
						}
					}

					if foundColumn == nil {
						// not found, add column
						if err = execTx.Migrator().AddColumn(value, dbName); err != nil {
							return err

		{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},

	}

	fields := []*schema.Field{
		{Name: "ID", DBName: "id", BindNames: []string{"ID"}, DataType: schema.Uint, PrimaryKey: true, Size: 64, Creatable: true, Updatable: true, Readable: true, HasDefaultValue: true, AutoIncrement: true},
		{Name: "Name", DBName: "", BindNames: []string{"Name"}, DataType: "", Tag: `gorm:"-"`, Creatable: false, Updatable: false, Readable: false},

			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) {