// a ctor for .WhereExists support
internal ConditionChainer(Chainer prev, INonSelectView nonSelectView, bool exists,
PredicateGroup predicateGroup = null)
: this(prev, predicateGroup)
{
CheckNullAndThrow(Arg(() => nonSelectView, nonSelectView));
SelectChainer select = new SelectChainer((Chainer)nonSelectView, new Column[] { Designer.Null }, false);
var view = new View(select, Query);
Query.AddArguments(view.Query.Arguments.ToArray());
Build = (buildContext, buildArgs) =>
{
string keyword = exists ? Text.Exists : Text.NotExists;
var sql = Text.GenerateSql(100)
.NewLine(predicateGroup.Build(PredicateGroupType.Begin, Keyword)).S()
.Append(prev.ExpressionGroupType.IsBegin() ? Text.LeftBracket : null)
.Append(keyword).S()
.EncloseLeft()
.Append(view.Build(buildContext, buildArgs))
.EncloseRight()
.Append(prev.ExpressionGroupType.IsEnd() ? Text.RightBracket : null)
.Append(predicateGroup.Build(PredicateGroupType.End, null))
.S();
TryThrow(buildContext);
return(sql.ToString());
};
}
private static DbTable <T> _Test <T>(Assembly ca, DbTable <T> node, string title, TestingOption option)
where T : DbRow
{
if (Admin.IsTestingEnvironmentOff(ca) || option == TestingOption.Skip)
{
return(node);
}
// handle reusability - !
var node2 = node.RootWithBrokenChain ?? node.Root;
Chainer query;
if (node2.IsPureSubject())
{
query = new SelectChainer((ISemantic)node2, new Column[] { }, false).Top(Admin.TestSelectTopRows);
}
else
{
query = new SelectChainer((ISemantic)node2, new Column[] { }, false);
}
var connectable = Reader.GetConnectable(ca, query);
using (var form = new TestingForm(connectable, option, title))
{
form.ShowDialog();
}
node2.Recover();
return(node);
}
/// <summary>
/// Returns the number of the rows returned by a semantic query.
/// </summary>
/// <typeparam name="T">The type of the subject node.</typeparam>
/// <param name="prev">Is a subject node.</param>
public static int CountGo <T>(this DbTable <T> prev)
where T : DbRow
{
prev.CheckNullAndThrow(Text.Free.Sentence, Text.Method.SelectCount);
var ca = Assembly.GetCallingAssembly();
var select = new SelectChainer((ISemantic)prev, new Column[] { Designer.Count().As(Text.Count) }, false);
var connectable = Reader.GetConnectable(ca, select);
return(Reader.LoadTable <Row <int> >(connectable, null).ToValue <int>());
}
/// <summary>
/// Returns true if a semantic query contains any rows.
/// </summary>
/// <typeparam name="T">The type of the subject node.</typeparam>
/// <param name="prev">A semantic query.</param>
/// <returns></returns>
public static bool ExistsGo <T>(this DbTable <T> prev)
where T : DbRow
{
prev.CheckNullAndThrow(Text.Free.Sentence, Text.Method.ExistsGo);
var ca = Assembly.GetCallingAssembly();
var select = new SelectChainer((ISemantic)prev, new Column[] { Designer.Null }, false);
var connectable = Reader.GetConnectable(ca, select.TopOne());
var result = Reader.LoadTable <dynamic>(connectable, null);
return(result.RowCount > 0);
}
