/// <summary>
/// Order the result set of a query by the specified column list. The order in which rows are returned in a result set are not guaranteed unless an ORDER BY clause is specified.
/// </summary>
/// <param name="prev">A predecessor object.</param>
/// <param name="firstColumn">The first column in the column list.</param>
/// <param name="otherColumns">Other columns in the column list.</param>
public static OrderByChainer OrderBy(this ISemqToSql prev,
OrderingArgument firstColumn, params OrderingArgument[] otherColumns)
{
prev.CheckNullAndThrow(Text.Free.Sentence, Text.Method.OrderBy);
return(new OrderByChainer((ISemantic)prev,
Common.MergeArrays <OrderingArgument>(firstColumn, otherColumns ?? new OrderingArgument[] { null })));
}
/// <summary>
/// Groups a selected set of rows into a set of summary rows by the values of one or more columns or expressions.
/// </summary>
/// <param name="prev">A predecessor object.</param>
/// <param name="columns">Are column expressions on which grouping is performed.</param>
public static GroupByChainer GroupBy(this ISemqToSql prev, params GroupingArgument[] columns)
{
prev.CheckNullAndThrow(Text.Free.Sentence, Text.Method.GroupBy);
return(new GroupByChainer((ISemantic)prev, columns));
}
/// <summary>
/// Retrieves the number of rows returned by the query.
/// </summary>
/// <param name="prev">A predecessor object.</param>
public static SelectChainer SelectCount(this ISemqToSql prev)
{
prev.CheckNullAndThrow(Text.Free.Sentence, Text.Method.SelectCount);
return(new SelectChainer((ISemantic)prev, new Column[] { Designer.Count().As(Text.Count) }, false));
}
/// <summary>
/// Retrieves unique rows from the database with columns from the specified list of columns.
/// </summary>
/// <param name="prev">A predecessor object.</param>
/// <param name="columns">
/// Is a specified list of columns.
/// </param>
public static SelectChainer SelectDistinct(this ISemqToSql prev, params Column[] columns)
{
prev.CheckNullAndThrow(Text.Free.Sentence, Text.Method.SelectDistinct);
return(new SelectChainer((ISemantic)prev, columns, true));
}
/// <summary>
/// Joins the nodes in a graph.
/// </summary>
/// <param name="prev">A graph.</param>
public static JoinGraphChainer Join(this ISemqToSql prev)
{
prev.CheckNullAndThrow(Text.Free.Graph, Text.Method.Join);
return(new JoinGraphChainer((ISemantic)prev));
}
