我在哪裏應該把SET SQL_BIG_SELECTS = 1在vb.net 2010

Question

我有這個至今：

Dim sqlconn As New MySqlConnection(connstring) 
sqlconn.Open() 

da.SelectCommand = New MySqlCommand(sql, sqlconn) 
da.Fill(ds) 
ds.WriteXml(CurDir() & "\SummaryReport.xml", XmlWriteMode.WriteSchema) 
MsgBox("XML created!", vbInformation) 

我應該在哪裏把SET SQL_BIG_SELECTS=1？我真的不知道，因爲我是vb.net的新手。

Answer 1

Dim sqlconn As New MySqlConnection(connstring) 
da.SelectCommand = New MySqlCommand("SET SESSION SQL_BIG_SELECTS=1;" & sql, sqlconn) 
da.Fill(ds) 'da.Fill() will open and close the connection for you 
ds.WriteXml(CurDir() & "\SummaryReport.xml", XmlWriteMode.WriteSchema) 
MsgBox("XML created!", vbInformation)