如何利用反射机制动态生成数据库表并进行字段修改？

import (
    "database/sql"
    "fmt"
    "log"
    "reflect"
    "strings"
    "time"

    "github.com/jinzhu/gorm"
)

type Table struct {
    TableName    string
    SelectFields string
    FieldNames   []string
    FieldTypes   []string
    FieldDefault []string
    FieldIsNull  []bool
    DataType     reflect.Type
}

func newTable(db *sql.DB, object interface{}, name string) Table {
    // get fields
    rows, err := db.Query("SELECT COLUMN_NAME, data_type,column_default,is_nullable FROM information_schema.COLUMNS WHERE TABLE_NAME = '" + name + "' ORDER BY ordinal_position;")
    if err != nil {
        panic(err)
    }
    tb := Table{TableName: name}
    var field, typ, coldf, isnil string
    for rows.Next() {
        rows.Scan(&field, &typ, &coldf, &isnil)
        tb.FieldNames = append(tb.FieldNames, field)
        tb.FieldTypes = append(tb.FieldTypes, tabletypes[typ])
        tb.FieldDefault = append(tb.FieldDefault, coldf)
        tb.FieldIsNull = append(tb.FieldIsNull, isnil == "YES")
    }
    tb.SelectFields = `"` + strings.Join(tb.FieldNames, `","`) + `"`

    // get struct type
    iValue := reflect.ValueOf(object)
    for iValue.Kind() == reflect.Ptr || iValue.Kind() == reflect.Interface {
        iValue = iValue.Elem()
    }
    if iValue.Kind() == reflect.Struct || iValue.Kind() == reflect.Map {
        tb.DataType = iValue.Type()
    } else {
        var sf []reflect.StructField = make([]reflect.StructField, len(tb.FieldNames))
        for i := 0; i < len(tb.FieldNames); i++ {
            name := strings.ToLower(tb.FieldNames[i])
            sf[i] = reflect.StructField{