4>、VB的程序代码实现动态调用的三种方法
①. 窗体变量的设置
Option Explicit
Dim CNN1 As ADODB.Connection '连接
Dim RS As ADODB.Recordset '结果集
Dim StrCnn As String '连接字符串
Dim DT10, DT20 As Variant '日期变量
Dim i As Integer '字段的计数 |
②. [基本格式]存储过程的调用
Private Sub Command1_Click() '以[基本方式]调用(1)存储过程
On Error Resume Next
Dim Cmd As ADODB.Command '命令
Dim Par As ADODB.Parameter '参数
'声明并初始化一个ADO 的Connection对象
DT10 = Format(Trim(DT1.Value), "yyyy-mm-dd") '起始日期赋值
DT20 = Format(Trim(DT2.Value), "yyyy-mm-dd") '截止日期赋值
Set Cmd = New ADODB.Command '指定cmd的当前连接CNN1
Cmd.ActiveConnection = CNN1
'指定该cmd 的当前活动连接
'设置要执行的是存储过程"[Employee Sales by Country] "
Cmd.CommandType = adCmdStoredProc '表明cmd 为存储过程
Cmd.CommandText = "[Employee Sales by Country] " '调用存储过程名称
Set Par = Cmd.CreateParameter("Beginning_Date", adDBDate, adParamInput, , DT10)
Cmd.Parameters.Append Par
Set Par= Cmd.CreateParameter("Ending_Date", adDBDate, adParamInput, , DT20)
Cmd.Parameters.Append Par
Set RS = Cmd.Execute()
'在Listview控件中显示RstByQuery记录集有效行
If DT10 < DT20 Then '调用网格的条件
If RS.Fields.Count > 0 Then '确认字段的列数
i = RS.Fields.Count
Listrec RS, LV
RS.Close
End If
End If
End Sub |
③. [简捷格式]存储过程的调用
Private Sub Command2_Click() '以[简捷方式]调用(2)存储过程
On Error Resume Next
DT10 = Format(Trim(DT1.Value), "yyyy-mm-dd")
DT20 = Format(Trim(DT2.Value), "yyyy-mm-dd")
Set RS = CNN1.Execute("[Employee Sales by Country] '" & DT10 & "' ,'" & DT20 & "'")
If DT10 < DT20 Then
'在Listview控件中显示RS记录集有效行
If RS.Fields.Count > 0 Then
i = RS.Fields.Count
Listrec RS, LV
RS.Close
End If
End If
End Sub |
④. [调用数据集的格式]执行存储过程
Private Sub Command3_Click() '以执行[结果集方式]调用(3)存储过程
On Error Resume Next
Dim Sql1 As String
DT10 = Format(Trim(DT1.Value), "yyyy-mm-dd")
DT20 = Format(Trim(DT2.Value), "yyyy-mm-dd")
Set RS = New Recordset
'对字段进行中文提示的处理
Sql1 = "SELECT Employees.Country as '国别', Employees.LastName as '姓名', Employees.FirstName as '曾用名',
Orders.ShippedDate as '日期' , Orders.OrderID as '序号', [Order Subtotals].Subtotal AS '销售合计' FROM
Employees INNER JOIN (Orders INNER JOIN [Order Subtotals] ON Orders.OrderID = [Order Subtotals].OrderID)
ON Employees.EmployeeID = Orders.EmployeeID WHERE Orders.ShippedDate Between '" & DT10 & "' AND '" & DT20 & "'"
If Len(Sql1) > 0 Then
RS.Open Sql1, CNN1, adOpenStatic, adLockOptimistic
'在Listview控件中显示RstByQuery记录集有效行
If RS.Fields.Count > 0 Then
i = RS.Fields.Count
Listrec RS, LV
RS.Close
End If
End If
End Sub |
⑤. 将结果集装入到ListView控件中
Sub Listrec(ByRef RS As Recordset, ByRef LV As ListView)
Dim head As ColumnHeader
Dim Item As ListItem
Dim K, P, Q As Integer
K = 0
'初始化listview的某些属性
LV.ToolTipText = ""
LV.View = lvwReport
LV.GridLines = True
LV.LabelEdit = lvwManual
LV.ListItems.Clear
LV.ColumnHeaders.Clear
For i = 0 To RS.Fields.Count - 1
'由于item.text不接受null ,故预先于空串作连接
Set head = LV.ColumnHeaders.Add
head.Text = RS.Fields(i).Name
Next
While Not RS.EOF
Set Item = LV.ListItems.Add
Item.Text = "" & RS.Fields(0).Value
For i = 1 To RS.Fields.Count - 1
Item.SubItems(i) = "" & RS.Fields(i).Value
Next
K = K + 1
RS.MoveNext
Wend
Text1.Text = ""
Text1.Text = CStr(K)
LV.ToolTipText = "有效记录条数:" + CStr(K)
End Sub |
⑥.工程/引用和连接SQL Server数据库
* 本文使用ADO，需要引用”Microsoft ActiveX data Objects 2.6 Library”对象。
* 连接SQL Server 2000数据库
Private Sub Form_Load() '在窗体的LOAD事件中加入如下代码:
Set CNN1 = New ADODB.Connection
'使用Connection对象的StrCnn属性,直接指定连接的SQL Server数据库
StrCnn="Provider=SQLOLEDB;DataSource=NO1;UserID=sa;pwd=;Initial Catalog=Northwind"
CNN1.Open StrCnn '打开连接 |
结束语
现已将VB中实现动态调用含DateTime类型的存储过程介绍完毕，为您提供了解决调用存储过程又一途径，愿您在掌握SQL Server 2000数据库调用存储过程这一技术中，畅通无阻，马到成功。
本程序的环境是Win2000中文网络版;SQL Server 2000专业版；中文VB6.0。
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