SQL server 系统储存过程在VB中的应用

以锁定应用程序资源(sp_getapplock / sp_releaseapplock)为例:

sp_getapplock没有返回参数(output类型的),只是在SP中用return来返回值

加锁:

Dim cmd As ADODB.Command
Set cmd = New ADODB.Command
cmd.ActiveConnection = cnn
cnn.BeginTrans
cnn.Execute "use master"
cmd.CommandType = adCmdStoredProc
cmd.CommandText = "sp_getapplock"
系统识别格式为:'"{ ? = call sp_getapplock(?,?,?,?) }"
cmd.Prepared = True
cmd.Parameters(1) = "lock name"    '资源锁的名称
cmd.Parameters(2) = "Exclusive"
cmd.Parameters(3) = "Transaction"
cmd.Parameters(4) = 0                        '用于接收SP 中return关键字返回的值
cmd.Execute
MsgBox cmd.Parameters(0)               'display return value

解锁:

Dim cmd As ADODB.Command
Set cmd = New ADODB.Command
cmd.ActiveConnection = cnn
cmd.CommandType = adCmdStoredProc
cmd.CommandText = "sp_releaseapplock"
cmd.Parameters(1) = "lock name"           '被锁资源名称
cmd.Parameters(2) = "Transaction"
cmd.Execute
MsgBox cmd.Parameters(0)