t.Errorf("should has prefixed column %v", name)
		}
	}

	stmt := gorm.Statement{DB: DB}
	if err := stmt.Parse(&EngadgetPost{}); err != nil {
		t.Fatalf("failed to parse embedded struct")
	} else if len(stmt.Schema.PrimaryFields) != 1 {
		t.Errorf("should have only one primary field with embedded struct, but got %v", len(stmt.Schema.PrimaryFields))
	}

	if !regexp.MustCompile("SELECT .* FROM .users. left join pets.*join accounts.*").MatchString(stmt.SQL.String()) {
		t.Errorf("joins should be ordered, but got %v", stmt.SQL.String())
	}

	iv := DB.Table(`table_invoices`).Select(`seller, SUM(total) as total, SUM(paid) as paid, SUM(balance) as balance`).Group(`seller`)

		t.Skip("skip sqlite, sqlserver due to it doesn't support multiple primary keys with auto increment")
	}

	if name := DB.Dialector.Name(); name == "postgres" {
		stmt := gorm.Statement{DB: DB}
		stmt.Parse(&Blog{})
		stmt.Schema.LookUpField("ID").Unique = true
		stmt.Parse(&Tag{})
		stmt.Schema.LookUpField("ID").Unique = true
		// postgers only allow unique constraint matching given keys
	}

pkg database/sql, method (*Stmt) QueryContext(context.Context, ...interface{}) (*Rows, error)
pkg database/sql, method (*Stmt) QueryRowContext(context.Context, ...interface{}) *Row
pkg database/sql, method (*Tx) ExecContext(context.Context, string, ...interface{}) (Result, error)
pkg database/sql, method (*Tx) PrepareContext(context.Context, string) (*Stmt, error)
pkg database/sql, method (*Tx) QueryContext(context.Context, string, ...interface{}) (*Rows, error)

	}

	return nil
}

// MySQLTarget - MySQL target.
type MySQLTarget struct {
	initOnce once.Init

	id         event.TargetID
	args       MySQLArgs
	updateStmt *sql.Stmt
	deleteStmt *sql.Stmt
	insertStmt *sql.Stmt
	db         *sql.DB
	store      store.Store[event.Event]
	firstPing  bool
	loggerOnce logger.LogOnce

	quitCh chan struct{}
}

// ID - returns target ID.

	"gorm.io/driver/mysql"
	"gorm.io/gorm"
	. "gorm.io/gorm/utils/tests"
)

type wrapperTx struct {
	*sql.Tx
	conn *wrapperConnPool
}

func (c *wrapperTx) PrepareContext(ctx context.Context, query string) (*sql.Stmt, error) {
	c.conn.got = append(c.conn.got, query)
	return c.Tx.PrepareContext(ctx, query)
}

func (c *wrapperTx) ExecContext(ctx context.Context, query string, args ...interface{}) (sql.Result, error) {

						DisableNestedTransaction: true,
					}).Create(joins.Interface()).Error)
				}
			}
		}
	}
}

func onConflictOption(stmt *gorm.Statement, s *schema.Schema, defaultUpdatingColumns []string) (onConflict clause.OnConflict) {
	if len(defaultUpdatingColumns) > 0 || stmt.DB.FullSaveAssociations {
		onConflict.Columns = make([]clause.Column, 0, len(s.PrimaryFieldDBNames))
		for _, dbName := range s.PrimaryFieldDBNames {

}

// PostgreSQLTarget - PostgreSQL target.
type PostgreSQLTarget struct {
	initOnce once.Init

	id         event.TargetID
	args       PostgreSQLArgs
	updateStmt *sql.Stmt
	deleteStmt *sql.Stmt
	insertStmt *sql.Stmt
	db         *sql.DB
	store      store.Store[event.Event]
	firstPing  bool
	connString string
	loggerOnce logger.LogOnce
	quitCh     chan struct{}
}

	checkField := func(model interface{}, fieldName string, unique bool, uniqueIndex string) {
		stmt := &gorm.Statement{DB: DB}
		err := stmt.Parse(model)
		if err != nil {
			t.Fatalf("%v: failed to parse schema, got error: %v", utils.FileWithLineNum(), err)
		}
		_ = stmt.Schema.ParseIndexes()
		field := stmt.Schema.LookUpField(fieldName)
		if field == nil {

	return clause.Expr{SQL: "DEFAULT"}
}

func (DummyDialector) Migrator(*gorm.DB) gorm.Migrator {
	return nil
}

func (DummyDialector) BindVarTo(writer clause.Writer, stmt *gorm.Statement, v interface{}) {
	writer.WriteByte('?')
}

func (DummyDialector) QuoteTo(writer clause.Writer, str string) {
	var (
		underQuoted, selfQuoted bool
		continuousBacktick      int8