private static SqlQueryExpression Form(PlSqlParser.QueryBlockContext context, out IntoClause into)
{
var fromClause = FromClauseBuilder.Build(context.fromClause());
SelectColumn[] columns;
if (context.all != null) {
columns = new[] {new SelectColumn(SqlExpression.Reference(new ObjectName("*")))};
} else {
columns = context.selectedElement().Select(SelectElement.BuildColumn).ToArray();
}
var query = new SqlQueryExpression(columns);
into = null;
if (context.DISTINCT() != null ||
context.UNIQUE() != null)
query.Distinct = true;
var intoClause = context.into_clause();
if (intoClause != null) {
into = new IntoClause();
if (intoClause.objectName() != null) {
into.TableName = Name.Object(intoClause.objectName());
} else if (intoClause.variable_name() != null) {
into.Variables = intoClause.variable_name().Select(Name.Variable).ToArray();
}
}
if (fromClause != null)
query.FromClause = fromClause;
var groupBy = context.groupByClause();
if (groupBy != null && !groupBy.IsEmpty) {
query.GroupBy = groupBy.groupByElements().expression().Select(x => new SqlExpressionVisitor().Visit(x));
var having = groupBy.havingClause();
if (having != null)
query.HavingExpression = new SqlExpressionVisitor().Visit(having.condition());
}
var groupMax = context.groupMaxClause();
if (groupMax != null && !groupMax.IsEmpty) {
var maxColumn = Name.Object(groupMax.objectName());
query.GroupMax = maxColumn;
}
var whereClause = context.whereClause();
if (whereClause != null && !whereClause.IsEmpty) {
var currentOf = whereClause.current_of_clause();
if (currentOf != null && !currentOf.IsEmpty) {
var cursorName = Name.Simple(currentOf.cursor_name());
throw new NotImplementedException();
} else {
query.WhereExpression = new SqlExpressionVisitor().Visit(whereClause.conditionWrapper());
}
}
return query;
}