如何通过SMO获取链接服务器上的SQL Server数据库?
Server server = GetServer("server");
Database db = server.Databases["db"];
LinkedServer ls = server.LinkedServers["ls"];
上面的第二行返回一个常规数据库。第三行返回特定的链接服务器,该服务器提供对链接服务器连接的访问,但不提供对其数据的访问。我怎样才能得到类似的东西:
Database db1 = server.LinkedServers["ls"].Databases["db"];
?我需要这个的原因是我将遍历链接数据库中的不同对象,例如表或视图。
更新
为了进一步澄清,我目前有这段代码:
public void GenerateViews(string objectName = null)
{
Server server = new Server("server");
//Database a = server.Databases["a"];
Database b = server.Databases["b"];
b.Tables.OfType<Table>().ToList().ForEach(o => ProcessSqlObject(o));
b.Views.OfType<View>().ToList().ForEach(o => ProcessSqlObject(o));
}
//takes all tables and views in database b that have a custom extended property "CreateView", and create a view for it in database a
private void ProcessSqlObject(dynamic o) //o MUST be an SMO table or view (since they don't implement a common interface, I'm using a dynamic)
{
Database ct = (Database)o.Parent;
Database a = ct.Parent.Databases["a"];
const string viewPrefix = "V_CTC_";
const string SourceIDColumnName = "SourceID";
string objectName = (string)o.Name; //name of table or view
objectName = objectName.StartsWith("V_", StringComparison.InvariantCultureIgnoreCase) ? objectName.Substring(2) : objectName;
string viewName = viewPrefix + objectName; //remove V_ from view, so that we don't have "V_V_".
ExtendedProperty ep = (ExtendedProperty)o.ExtendedProperties["CreateView"];
bool AlreadyExists = a.Views.OfType<View>().Any(v => v.Name == viewName);
if (ep != null && ep.Value.ToString() == "1") //there IS an extended property, and its value is 1, meaning, we want a view
{
if (!AlreadyExists) //we don't already have the view
{
//ProcessSqlObject(t, viewName, SourceIDColumnName, ct, a);
StringBuilder ws = new StringBuilder();
ws.AppendLine("SELECT");
ws.AppendLine("\t2 [" + SourceIDColumnName + "]");
((ColumnCollection)o.Columns).OfType<Column>().ToList().ForEach(c =>
{
ws.AppendLine("\t, [" + c.Name + "]");
});
string linkedServer = "[ls].";
ws.AppendLine("FROM " + linkedServer + "[" + ct.Name + "].[dbo].[" + o.Name + "] WITH(NOLOCK)");
string rt = ws.ToString();
rt = rt.Replace("wholesale", "retail");
rt = rt.Replace("2 [" + SourceIDColumnName + "]", "3 [" + SourceIDColumnName + "]");
StringBuilder sql = new StringBuilder();
sql.AppendLine("CREATE VIEW " + viewName + " AS");
sql.AppendLine();
sql.AppendLine(ws.ToString());
//sql.AppendLine();
sql.AppendLine("UNION ALL");
sql.AppendLine();
sql.AppendLine(rt);
Console.WriteLine(sql);
a.ExecuteNonQuery(sql.ToString());
}
}
else //we DON't want the view
{
a.Views.OfType<View>().Single(v => v.Name == viewName).Drop();
a.Refresh();
}
}
}
我目前正在向给定数据库中的所有表和视图的第二个函数传递。这不使用链接服务器。我希望能够为链接服务器做同样的事情,而不必重写代码。
感谢。
答案 0 :(得分:1)
您不需要连接到服务器来获取表和视图(如果您只需要他们的名字)。 LinkedServer类为此提供EnumTables method。
答案 1 :(得分:1)
LinkedServer class有一个DataSource属性,您应该可以将其用作远程服务器的名称。如果将其传递给GetServer()
函数,则应该返回SMO服务器对象。