对于存储过程的返回值,在VB6.0中怎样取出来?
例如:一个存储过程的代码如下
CREATE PROCEDURE get @gt int output
AS
select @gt=123
return @gt
GO
在VB调用这个存储过程:SQLDB.Execute "get '" & s & "'"
关键是怎么把返回值取出来?如果能取出来,应该怎么写?
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存储过程的返回值问题!
对于存储过程的返回值,在VB6.0中怎样取出来? 例如:一个存储过程的代码如下 CREATE PROCEDURE get @gt int output AS select @gt=123 return @gt GO 在VB调用这个存储过程:SQLDB.Execute "get '" & s & "'" 关键是怎么把返回值取出来?如果能取出来,应该怎么写?
Dim con As ADODB.Connection
Dim com As ADODB.Command
Private Sub Form_Load()
'先打开数据库,代码省了
con.Open
Set com = New ADODB.Command
com.ActiveConnection = con
com.CommandText = "get"
com.CommandType = adCmdStoredProc
com.Parameters.Append com.CreateParameter("@gt", adInteger, adParamOutput)
MsgBox com.Parameters("@gt")
End Sub
USE pubs
GO
CREATE PROCEDURE myProc
@outparm int OUTPUT
@inparm int
AS
SELECT * FROM titles WHERE royalty > @inparm
SELECT @outparm = COUNT (*) FROM TITLES WHERE royalty > @inparm
IF (@outparm > 0)
RETURN 0
ELSE
RETURN 99
GO
An ADO code program that executes the stored procedure myProc is shown here.
Dim cn As New ADODB.Connection
Dim cmd As New ADODB.Command
Dim rs As New ADODB.Recordset
Dim fldloop As ADODB.Field
Dim param1 As Parameter, param2 As Parameter, param3 As Parameter
Dim provStr As String
Dim royalty As Variant
Private Sub spStart()
' Connect using the SQLOLEDB provider.
cn.Provider = "sqloledb"
' Specify connection string on Open method.
provStr = "Server=MyServer;Database=pubs;Trusted_Connection=yes"
cn.Open provStr
' Set up a command object for the stored procedure.
Set cmd.ActiveConnection = cn
cmd.CommandText = "myProc"
cmd.CommandType = adCmdStoredProc
' Set up a return parameter.
Set param1 = cmd.CreateParameter("Return", adInteger, adParamReturnValue)
cmd.Parameters.Append param1
' Set up an output parameter.
Set param2 = cmd.CreateParameter("Output", adInteger, adParamOutput)
cmd.Parameters.Append param2
' Set up an input parameter.
Set param3 = cmd.CreateParameter("Input", adInteger, adParamInput)
cmd.Parameters.Append param3
royalty = Trim(InputBox("Enter royalty:"))
param3.Value = royalty
' Execute command, and loop through recordset, printing out rows.
Set rs = cmd.Execute
Dim i As Integer
While Not rs.EOF
For Each fldloop In rs.Fields
Debug.Print rs.Fields(i)
i = i + 1
Next fldloop
Debug.Print ""
i = 0
rs.MoveNext
Wend
' Need to close recordset before getting return
' and output parameters.
rs.Close