// set table alias (internally)
internal void SetAlias(AliasAs alias)
{
// if a table already has an alias => remove it
if (_alias != null)
{
Statement.RemoveAlias(_alias);
_alias = null;
}
_alias = alias;
}
private TableChainer(Chainer prev)
: base(prev)
{
// set default table alias
_alias = new AliasAs(Query.GetIncrementalTableAlias());
Build = (buildContext, buildArgs) =>
{
return(BaseBuildMethod(buildContext, buildArgs));
};
}
// set table alias (by client)
internal void SetAliasByClient(AliasAs alias)
{
// if a table already has an alias => remove it
if (_alias != null)
{
Statement.RemoveAlias(_alias);
_alias = null;
}
Statement.CheckAlias(alias);
TryThrow(Statement.Exception);
_alias = alias;
}
// ctor for Pivot/Unpivot
internal TableChainer(Chainer prev, bool overload)
: base(prev)
{
var cfrom = GetPrev <FromChainer>();
if (cfrom.Node != null)
{
SetNode(cfrom.Node);
}
_alias = new AliasAs(Query.GetIncrementalTableAlias());
Query.AddTableObject(this);
// no build method: build is done by PivotChainer object
}
private void ProcessTableArgument(Table table)
{
Query.AddTableObject(this);
CheckNullAndThrow(Arg(() => table, table));
TryThrow(table.Exception);
Query.AddArgument(table);
_table = table;
_alias = table.Alias ?? _alias;
if (chainException != null)
{
chainException.Extra = String.Format("Check {0} method.", chainException.Method);
TryThrow();
}
TableArgument = table;
}
internal void CheckAlias(AliasAs alias)
{
// check alias name
if (IsDefaultAlias(alias.Name))
{
_exception = new QueryTalkException("Statement.CheckAlias", QueryTalkExceptionType.InvalidTableAlias,
String.Format("table alias = {0}", alias.Name));
return;
}
// alias should be unique in the build context
if (_aliases.Select(a => a.Name).Contains(alias.Name))
{
_exception = new QueryTalkException("Statement.CheckAlias", QueryTalkExceptionType.TableAliasDuplicate,
String.Format("table alias = {0}", alias));
return;
}
_aliases.Add(alias);
}
internal void RemoveAlias(AliasAs alias)
{
_aliases.Remove(alias);
}