public static SqlQueryExpression Form(PlSqlParser.SubqueryContext context, out IntoClause into)
{
var query = Form(context.subqueryBasicElements(), out into);
var opPart = context.subquery_operation_part();
if (opPart.Length > 0)
{
if (into != null)
{
throw new InvalidOperationException("Cannot SELECT INTO in a composite query.");
}
foreach (var part in opPart)
{
CompositeFunction function;
if (part.MINUS() != null || part.EXCEPT() != null)
{
function = CompositeFunction.Except;
}
else if (part.UNION() != null)
{
function = CompositeFunction.Union;
}
else if (part.INTERSECT() != null)
{
function = CompositeFunction.Intersect;
}
else
{
throw new ParseCanceledException("Invalid composite function.");
}
bool isAll = part.ALL() != null;
var next = Form(part.subqueryBasicElements());
var prev = query.NextComposite;
if (prev == null)
{
prev = next;
}
else
{
prev.NextComposite = next;
}
query.IsCompositeAll = isAll;
query.CompositeFunction = function;
query.NextComposite = prev;
}
}
return(query);
}
public static SqlQueryExpression Form(PlSqlParser.SubqueryContext context, out IntoClause into)
{
var query = Form(context.subqueryBasicElements(), out into);
var opPart = context.subquery_operation_part();
if (opPart.Length > 0) {
if (into != null)
throw new InvalidOperationException("Cannot SELECT INTO in a composite query.");
foreach (var part in opPart) {
CompositeFunction function;
if (part.MINUS() != null || part.EXCEPT() != null) {
function = CompositeFunction.Except;
} else if (part.UNION() != null) {
function = CompositeFunction.Union;
} else if (part.INTERSECT() != null) {
function = CompositeFunction.Intersect;
} else {
throw new ParseCanceledException("Invalid composite function.");
}
bool isAll = part.ALL() != null;
var next = Form(part.subqueryBasicElements());
var prev = query.NextComposite;
if (prev == null) {
prev = next;
} else {
prev.NextComposite = next;
}
query.IsCompositeAll = isAll;
query.CompositeFunction = function;
query.NextComposite = prev;
}
}
return query;
}
private static SqlQueryExpression Form(PlSqlParser.SubqueryBasicElementsContext context, out IntoClause into)
{
var sub = context.subquery();
if (sub != null && !sub.IsEmpty)
{
return(Form(sub, out into));
}
return(Form(context.queryBlock(), out into));
}
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);
}
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;
}
private static SqlQueryExpression Form(PlSqlParser.SubqueryBasicElementsContext context, out IntoClause into)
{
var sub = context.subquery();
if (sub != null && !sub.IsEmpty)
return Form(sub, out into);
return Form(context.queryBlock(), out into);
}
