fix: format sql name

 package domainService
 
 import (
+	"bytes"
 	"fmt"
 	"github.com/google/uuid"
 	pgTransaction "github.com/linmadan/egglib-go/transaction/pg"
@@ -191,5 +192,29 @@ func DataField(name string, sqlType string, flag int, index int) *domain.Field {
 }
 
 func pin(name string) string {
-	return tool_funs.ToPinYin(name, "_")
+	pinyin := tool_funs.ToPinYin(name, "_")
+	newPinyin := bytes.NewBuffer(nil)
+	firstCharIsLetter := false
+	for i := range pinyin {
+		b := pinyin[i]
+		if !firstCharIsLetter {
+			firstCharIsLetter = isLetters(b)
+		}
+		if !firstCharIsLetter {
+			continue
+		}
+		if !(isDigital(b) || isLetters(b) || b == byte('_')) {
+			continue
+		}
+		newPinyin.WriteByte(b)
+	}
+	return newPinyin.String()
+}
+
+func isDigital(b byte) bool {
+	return b >= byte('0') && b <= byte('9')
+}
+
+func isLetters(b byte) bool {
+	return (b >= byte('a') && b <= byte('z')) || (b >= byte('A') && b <= byte('Z'))
 }

@@ -94,7 +94,12 @@ func (d *FilePreviewDto) Load(fileId int, m *domain.DataLoadDataTable, file *red
 	d.TableType = domain.ExcelTable.ToString()
 	d.Fields = m.Fields
 	var fields []*domain.Field
-	mapData := domain.ToFieldData(m.Fields, m.Data, true)
+	mapData := domain.ToFieldData(m.Fields, formatData(m.Data, func(s string) string {
+		if s == "<NA>" {
+			return ""
+		}
+		return s
+	}), true)
 	d.Data = domain.GripData(mapData, int64(m.Total))
 	d.PageNumber = m.PageNumber
 
@@ -115,6 +120,15 @@ func (ptr *PreviewDataTableService) GetFileId() int {
 	return ptr.FileId
 }
 
+func formatData(data [][]string, f func(s string) string) [][]string {
+	for i := 0; i < len(data); i++ {
+		for j := 0; j < len(data[i]); j++ {
+			data[i][j] = f(data[i][j])
+		}
+	}
+	return data
+}
+
 func NewLoadDataTableService(transactionContext *pgTransaction.TransactionContext) (*PreviewDataTableService, error) {
 	if transactionContext == nil {
 		return nil, fmt.Errorf("transactionContext参数不能为nil")