数据库的问题

[wuying0609]

Public Sub Insert()
Dim mydb As New AccessDb
Dim StrSqlStr As String
StrSqlStr = "Insert into book (tel,Name,age,sex) values('" + myTel + "','" + myName + "','" + myAge + "','" + mySex + "')"
mydb.ExecuteSqlStrDetails(StrSqlStr)
End Sub
为什么执行的时候会说什么"Insert into book (tel,Name,age,sex) values('" + myTel + "','" + myName + "','" + myAge + "','" + mySex + "')"无法转换成double型？