public XPServerCollectionSource GetXCS(string sServerName, string sUserName, string sPassword, string sDBName, string sSql, string sColumnXML,
System.Web.UI.Page oPage, bool p_bHasKeyField)
{
XPServerCollectionSource l_xcs = null;
page = oPage;
page.Unload += new EventHandler(Page_Unload);
strCTEName = "CTE_" + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Millisecond.ToString();
//Use your own GetConnectionString method based on the passed parameters
string connectionString = MSSqlConnectionProviderWithCte.GetConnectionString(sServerName, sDBName);
XPDictionary dict = new ReflectionDictionary();
XPClassInfo classInfo = dict.CreateClass(dict.GetClassInfo(typeof(BasePersistentClass)), strCTEName);
XmlDocument l_xmlDoc = new XmlDocument();
l_xmlDoc.LoadXml(sColumnXML);
XmlNodeList l_xnl = l_xmlDoc.SelectNodes("//FLD");
for (int i = 0; i < l_xnl.Count; i++)
{
Type l_type = null;
switch (l_xnl[i]["DATTYP"].InnerText.ToLower())
{
case "int64":
l_type = typeof(Int64);
break;
case "byte[]":
l_type = typeof(Byte[]);
break;
case "boolean":
l_type = typeof(Boolean);
break;
case "string":
l_type = typeof(String);
break;
case "char[]":
l_type = typeof(Char[]);
break;
case "datetime":
l_type = typeof(DateTime);
break;
case "datetimeoffset":
l_type = typeof(DateTimeOffset);
break;
case "decimal":
l_type = typeof(Decimal);
break;
case "double":
l_type = typeof(Double);
break;
case "int32":
l_type = typeof(Int32);
break;
case "single":
l_type = typeof(Single);
break;
case "int16":
l_type = typeof(Int16);
break;
case "object":
l_type = typeof(Object);
break;
case "timeSpan":
l_type = typeof(TimeSpan);
break;
case "byte":
l_type = typeof(Byte);
break;
case "guid":
l_type = typeof(Guid);
break;
case "xml":
l_type = typeof(XmlDocument);
break;
}
if (i == 0)
{
classInfo.CreateMember(l_xnl[i]["COL"].InnerText, l_type, new KeyAttribute(true));
}
else
{
classInfo.CreateMember(l_xnl[i]["COL"].InnerText, l_type);
}
}
dal = new SimpleDataLayer(dict, XpoDefault.GetConnectionProvider(connectionString, AutoCreateOption.SchemaAlreadyExists));
uow = new UnitOfWork(dal);
string l_strQuery = "";
l_strQuery = " AS (" + sSql + ")";
uow.RegisterCte(strCTEName, @l_strQuery);
try
{
l_xcs = new XPServerCollectionSource(uow, classInfo);
return(l_xcs);
}
finally
{
}
return(l_xcs);
}
static void Main(string[] args)
{
DevExpress.Xpo.Logger.LogManager.SetTransport(new ConsoleLogger());
XpoDefault.ConnectionString = MSSqlConnectionProviderWithCte.GetConnectionString(@"(local)", "CTE_Test");
//fill structure and data
using (UnitOfWork uow = new UnitOfWork()) {
uow.ClearDatabase();
new BaseTable(uow)
{
Str = "Aa"
};
new BaseTable(uow)
{
Str = "bB"
};
new BaseTable(uow)
{
Str = "CCccc"
};
uow.CommitChanges();
}
//working with cte
using (UnitOfWork uow = new UnitOfWork()) {
uow.RegisterCte("CteStructure_1", "(ID, String, Math) AS (select OID, Str, sin(OID) from BaseTable)");
try {
Console.WriteLine("=== Count for sine CTE ===");
Console.WriteLine("Count: {0}", uow.Evaluate <CteStructure_1>(new AggregateOperand(null, null, Aggregate.Count, null), null));
Console.WriteLine("=== Filtered count for sine CTE ===");
Console.WriteLine("Count: {0}", uow.Evaluate <CteStructure_1>(new AggregateOperand(null, null, Aggregate.Count, null), new OperandProperty("ID") > 1));
Console.WriteLine("=== Select all with sine CTE ===");
foreach (var cteS in new XPCollection <CteStructure_1>(uow))
{
Console.WriteLine(cteS.ToString());
}
} finally {
uow.UnregisterCte("CteStructure_1");
}
}
using (UnitOfWork uow = new UnitOfWork()) {
uow.RegisterCte("CteStructure_1", "AS (select OID as ID, 'MyString: ' + coalesce(Str, '') as String, cos(OID) as Math from BaseTable where len(Str) < 5)");
try {
Console.WriteLine("=== Count for filtered CTE ===");
Console.WriteLine("Count: {0}", uow.Evaluate <CteStructure_1>(new AggregateOperand(null, null, Aggregate.Count, null), null));
Console.WriteLine("=== Filtered count for filtered CTE ===");
Console.WriteLine("Count: {0}", uow.Evaluate <CteStructure_1>(new AggregateOperand(null, null, Aggregate.Count, null), new OperandProperty("ID") > 1));
Console.WriteLine("=== Select all with filtered CTE ===");
foreach (var cteS in new XPCollection <CteStructure_1>(uow))
{
Console.WriteLine(cteS.ToString());
}
Console.WriteLine("=== Linq2XPO ===");
foreach (var cteS in uow.Query <CteStructure_1>().Where(q => q.Math >= 0))
{
Console.WriteLine(cteS.ToString());
}
} finally {
uow.UnregisterCte("CteStructure_1");
}
}
Console.ReadLine();
}
