包含vb点虐 num的词条

VB点虐 ，小数点直接进一位的函数?

'自定义一个函数：功能是给小数直接进一位

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'num 　要操作的小数

'n　保留几位小数，

Function getNumber(num As Double, n As Integer) As Double

Dim a As Double

a = Int(num * (10 ^ n)) / (10 ^ n)

If a = num Then

getNumber = a

Else

getNumber = a + 1 / (10 ^ n)

End If

End Function

-------------------------

调用一下：

Private Sub Command1_Click()

MsgBox (getNumber(3.1415926, 2))

End Sub

得到3.15

vb点虐 提取特定字符串

在VB中是这样的，没学过VB点虐 ，你变换一下就可以了

Option

Explicit

Private

Sub

Command1_Click()

Dim

Num(2)

Num(0)

=

Val(Left(Label1.Caption,

2))

Num(1)

=

Val(Mid(Label1.Caption,

3,

1))

Num(2)

=

Val(Right(Label1.Caption,

2))

MsgBox

"Num(0)="

Num(0)

vbCrLf

"Num(1)="

Num(1)

vbCrLf

"Num(2)="

Num(2)

'如果想测试是不是可以计算，可以用这一句

'MsgBox

"Num(0)+1="

Num(0)

+

1

vbCrLf

"Num(1)+1="

Num(1)

+

1

vbCrLf

"Num(2)+1="

Num(2)

+

1

End

Sub

Private

Sub

Form_Load()

Label1.Caption

=

"12345"

End

Sub

使用vb点虐 的字符串

用字符串保存两个数据，当然只有你这种办法，另外提供你其它思路：

1. flexcell增加两列，这两列隐藏不显示，额外数据可以从这两列读取

2. 用自定义类型数组，保存这两列数据，数组顺序和表格一样，或者数组中增加一个ID元素，与表格对应

vb点虐 中 sql查询出来的值，比如books中的remainnum,赋给一个变量 num，再将num-1之后update到remainnum中

Dim num As Integer

Dim connstr, insertcmd, selectcmd As String

connstr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\360data\重要数据\我的文档\hd.mdb"

Dim conn As OleDbConnection

Dim cmd, cmd1 As OleDbCommand

conn = New OleDbConnection(connstr)

Dim r As OleDbDataReader

conn.Open()

insertcmd = "insert into returnbooks (aid,aname,ISBN,bname,renum,reday) values("

Val(ComboBox1.Text) ",'"

TextBox2.Text "','"

ComboBox2.Text "','"

TextBox2.Text "',"

Val(TextBox3.Text) ",'"

CType(TextBox4.Text, Date) "' )"

cmd = New OleDbCommand(insertcmd, conn)

cmd.ExecuteNonQuery()

updatecmd = "update books set remainnum=" Val(num) "-" Val(TextBox3.Text) " where ISBN='" ComboBox2.Text "'"

cmd = New OleDbCommand(updatecmd, conn)

cmd.ExecuteNonQuery()

updatecmd = "select remainnum as num from books where ISBN= '" ComboBox2.Text "'"

cmd = New OleDbCommand(updatecmd, conn)

cmd.ExecuteNonQuery()

updatecom = "update books set remainnum=num+ " Val(TextBox3.Text) ""

cmd = New OleDbCommand(updatecmd, conn)

cmd.ExecuteNonQuery()

selectcmd = "select remainnum from books where ISBN='" ComboBox2.Text "'"

cmd1 = New OleDbCommand(selectcmd, conn)

r = cmd1.ExecuteReader()

If (r.Read()) Then '如果sql查询到了数据

num = r.GetInt32(0)

End If

conn.Close()

/*注意代码的格式，不然改起来太费时间*/

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