asp.net 存储过程调用_实用技巧

1．调用存储过程，但无返回值

复制代码 代码如下:

Private Function SqlProc1(ByVal ProcName As String) As Boolean
'定义数据链接部分省略, myConn为链接对象 ProcName为存储过程名
Dim myCommand As New SqlClient.SqlCommand(ProcName, myConn)
With myCommand
.CommandType = CommandType.StoredProcedure
.Parameters.Add("@CodeType", SqlDbType.VarChar, 20).Value = "年级编码"
Try
.ExecuteNonQuery()
Return True
Catch ex As Exception
Return False
End Try
End Function

2．调用存储过程，返回普通值

复制代码 代码如下:

Private Function SqlProc1(ByVal ProcName As String) As String
'定义数据链接部分省略, myConn为链接对象
Dim myCommand As New SqlClient.SqlCommand(ProcName, myConn)
With myCommand
.CommandType = CommandType.StoredProcedure
.Parameters.Add("@CodeType", SqlDbType.VarChar, 20).Value = "年级编码"
.Parameters.Add("@NewCode", SqlDbType.VarChar, 20).Direction = ParameterDirection.Output
Try
.ExecuteNonQuery()
Return .Parameters(1).Value()
Catch ex As Exception
Return "无编码生成"
End Try
End Function

3．调用存储过程，返回数据集
'VB.NET代码

复制代码 代码如下:

Private Function SqlProc2(ByVal ProcName As String, ByVal Param1 As String) As DataSet
'定义命令对象，并使用储存过程
Dim myCommand As New SqlClient.SqlCommand
myCommand.CommandType = CommandType.StoredProcedure
myCommand.CommandText = ProcName
myCommand.Connection = myConn
'定义一个数据适配器，并设置参数
Dim myDapter As New SqlClient.SqlDataAdapter(myCommand)
myDapter.SelectCommand.Parameters.Add("@name", SqlDbType.VarChar, 20).Value = Param1
'定义一个数据集对象，并填充数据集
Dim myDataSet As New DataSet
Try
myDapter.Fill(myDataSet)
Catch ex As Exception
End Try
Return myDataSet
End Function
'存储过程代码
Create Proc Test @name varchar(20) As
Select * From EC_Grade where cGradeName=@name
GO
***如果将存储过程修改部分内容,可以做为查询使用
CREATE Proc Test
@name varchar(200)=''
--此处应该注意200为查询条件的长度,可以根据实际情况而定;但不建议用于过长的查询条件
As
Declare @sql1 varchar(8000)
if @name<>''
Select @sql1='Select * From EC_Grade where '+ @name
else
Select @sql1='Select * From EC_Grade'
exec(@sql1)
GO