// write a simple placeholder
	writer.WriteByte('?')
}
func (d testDialector) QuoteTo(writer clause.Writer, s string)         { writer.WriteString(s) }
func (d testDialector) Explain(sql string, vars ...interface{}) string { return sql }

// newTestDB returns a minimal *DB with an initialized Statement suitable for unit tests
func newTestDB() *gorm.DB {
	d := testDialector{}
	cfg := &gorm.Config{Dialector: d}

// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package sql

import "fmt"

type s3Error struct {
	code       string
	message    string
	statusCode int
	cause      error
}

func (err *s3Error) Cause() error {
	return err.cause
}

			db.Statement.Result.Error = db.Error
		}
	}
	return db.Error
}

// DB returns `*sql.DB`
func (db *DB) DB() (*sql.DB, error) {
	connPool := db.ConnPool
	if db.Statement != nil && db.Statement.ConnPool != nil {
		connPool = db.Statement.ConnPool
	}
	if tx, ok := connPool.(*sql.Tx); ok && tx != nil {
		return (*sql.DB)(reflect.ValueOf(tx).Elem().FieldByName("db").UnsafePointer()), nil
	}

- ⚡ [**FastAPI**](https://fastapi.tiangolo.com) for the Python backend API.
  - 🧰 [SQLModel](https://sqlmodel.tiangolo.com) for the Python SQL database interactions (ORM).
  - 🔍 [Pydantic](https://docs.pydantic.dev), used by FastAPI, for the data validation and settings management.
  - 💾 [PostgreSQL](https://www.postgresql.org) as the SQL database.
- 🚀 [React](https://react.dev) for the frontend.

* Transactions, Nested Transactions, Save Point, RollbackTo to Saved Point
* Context, Prepared Statement Mode, DryRun Mode
* Batch Insert, FindInBatches, Find To Map
* SQL Builder, Upsert, Locking, Optimizer/Index/Comment Hints, NamedArg, Search/Update/Create with SQL Expr
* Composite Primary Key
* Auto Migrations
* Logger
* Extendable, flexible plugin API: Database Resolver (Multiple Databases, Read/Write Splitting) / Prometheus…

			wantResult: `{"_1":-3}`,
		},
		// Examples from https://docs.aws.amazon.com/AmazonS3/latest/userguide/s3-glacier-select-sql-reference-date.html#s3-glacier-select-sql-reference-date-diff
		{
			name:       "date_diff_year",
			query:      `SELECT date_diff(year, '2010-01-01T', '2011-01-01T') FROM S3Object LIMIT 1`,
			wantResult: `{"_1":1}`,
		},
		{

	}

	for _, f := range p.fns {
		f(db)
	}

	if stmt.SQL.Len() > 0 {
		db.Logger.Trace(stmt.Context, curTime, func() (string, int64) {
			sql, vars := stmt.SQL.String(), stmt.Vars
			if filter, ok := db.Logger.(ParamsFilter); ok {
				sql, vars = filter.ParamsFilter(stmt.Context, stmt.SQL.String(), stmt.Vars...)
			}
			return db.Dialector.Explain(sql, vars...), db.RowsAffected
		}, db.Error)
	}

- ⚡ Python 백엔드 API를 위한 [**FastAPI**](https://fastapi.tiangolo.com/ko).
    - 🧰 Python SQL 데이터베이스 상호작용을 위한 [SQLModel](https://sqlmodel.tiangolo.com) (ORM).
    - 🔍 FastAPI에 의해 사용되는, 데이터 검증과 설정 관리를 위한 [Pydantic](https://docs.pydantic.dev).
    - 💾 SQL 데이터베이스로서의 [PostgreSQL](https://www.postgresql.org).
- 🚀 프론트엔드를 위한 [React](https://react.dev).
    - 💃 TypeScript, hooks, Vite 및 기타 현대적인 프론트엔드 스택을 사용.

pkg crypto/x509, type OID struct #60665
pkg database/sql, method (*Null[$0]) Scan(interface{}) error #60370
pkg database/sql, method (Null[$0]) Value() (driver.Value, error) #60370
pkg database/sql, type Null[$0 interface{}] struct #60370
pkg database/sql, type Null[$0 interface{}] struct, V $0 #60370
pkg database/sql, type Null[$0 interface{}] struct, Valid bool #60370
pkg debug/elf, const R_LARCH_64_PCREL = 109 #63725

package schema

import (
	"bytes"
	"context"
	"database/sql"
	"database/sql/driver"
	"encoding/gob"
	"encoding/json"
	"fmt"
	"math"
	"reflect"
	"strings"
	"sync"
	"time"
)

var serializerMap = sync.Map{}

// RegisterSerializer register serializer
func RegisterSerializer(name string, serializer SerializerInterface) {
	serializerMap.Store(strings.ToLower(name), serializer)
}

// GetSerializer get serializer