数据库 unsigned 类型识别失败，无符号类型全部识别成了有符号类型

[xt-inking]

1. What version of Go and system type/arch are you using?

go version go1.19.4 linux/amd64

2. What version of GoFrame are you using?

v2.2.5

3. Can this issue be re-produced with the latest release?

Yes.

4. What did you do?

CREATE TABLE `demo` (
	`id` BIGINT(20) UNSIGNED NOT NULL DEFAULT '0',
	PRIMARY KEY (`id`) USING BTREE
)
COLLATE='utf8mb4_general_ci'
ENGINE=InnoDB
;
INSERT INTO `demo` (`id`) VALUES (18446744073709551615);

package main

import (
	"github.com/gogf/gf/v2/frame/g"

	_ "github.com/gogf/gf/contrib/drivers/mysql/v2"
)

func main() {
	r, e := g.DB().Model("demo").One()
	if e != nil {
		panic(e)
	}
	g.DumpWithType(r["id"].Val())
}

5. What did you expect to see?

uint64(18446744073709551615)
or
uint(18446744073709551615)

6. What did you see instead?

int64(-9223372036854775808)

[xt-inking]

查源码发现框架 *gdb.Core 的 ConvertValueForLocal 方法的 fieldType 参数依照 float(5,2), unsigned double(5,2), decimal(10,2), char(45), varchar(100), etc. 格式进行处理，但该参数的值来源于 *sql.ColumnType 类型的 DatabaseTypeName 方法，此方法只会返回 "VARCHAR", "TEXT", "NVARCHAR", "DECIMAL", "BOOL", "INT", and "BIGINT" 等格式的值。

[gqcn]

@xt-inking 感谢反馈，我先打上标签，后续跟进查看一下。

[gqcn]

#2428