public static QsiTableExpressionNode VisitSelectStatement(SelectStatementContext context)
{
return(TreeHelper.Create <QsiTableExpressionNode>(n =>
{
n.Table.SetValue(TableVisitor.VisitSelectStatement(context));
}));
}
public SelectStatement ParseSelectStatement(SelectStatementContext node)
{
SelectStatement statement = new SelectStatement();
foreach (var child in node.children)
{
if (child is QuerySpecificationContext query)
{
statement = this.ParseQuerySpecification(query);
}
else if (child is UnionSelectContext union)
{
statement = this.ParseUnionSelect(union);
}
else if (child is QueryExpressionContext exp)
{
QuerySpecificationContext querySpec = exp.querySpecification();
if (querySpec != null)
{
statement = this.ParseQuerySpecification(querySpec);
}
}
}
return(statement);
}
public static SelectQueryInfo VisitSelectStatement(SelectStatementContext context)
{
switch (context)
{
case SimpleSelectContext simpleSelectContext:
return(VisitSimpleSelectContext(simpleSelectContext));
case ParenthesisSelectContext parenthesisSelectContext:
return(VisitQueryExpression(parenthesisSelectContext.queryExpression()));
}
return(VisitorHelper.ThrowNotSupportedContext <SelectQueryInfo>(context));
}
public static QsiTableNode VisitSelectStatement(SelectStatementContext context)
{
switch (context)
{
case SimpleSelectContext simpleSelectContext:
return(VisitQuerySpecification(simpleSelectContext.querySpecification()));
case ParenthesisSelectContext parenthesisSelectContext:
return(VisitQueryExpression(parenthesisSelectContext.queryExpression()));
}
return(null);
}
public static QsiTableNode VisitSelectStatement(SelectStatementContext context)
{
var withClause = context.withClause();
var subquery = context.subquery();
var forClause = context.forClause();
var timeTravel = context.timeTravel();
var hintClause = context.hintClause();
var subqueryNode = VisitSubquery(subquery);
if (withClause is null && forClause is null && timeTravel is null && hintClause is null)
{
return(subqueryNode);
}
if (subqueryNode is not HanaDerivedTableNode derivedTableNode)
{
derivedTableNode = new HanaDerivedTableNode
{
Columns = { Value = TreeHelper.CreateAllColumnsDeclaration() },
Source = { Value = subqueryNode }
};
}
if (withClause is not null)
{
derivedTableNode.Directives.SetValue(VisitWithClause(withClause));
}
if (forClause is not null)
{
derivedTableNode.Behavior.SetValue(VisitForClause(forClause));
}
if (timeTravel is not null)
{
derivedTableNode.TimeTravel.SetValue(TreeHelper.Fragment(timeTravel.GetInputText()));
}
if (hintClause is not null)
{
derivedTableNode.Hint.SetValue(TreeHelper.Fragment(hintClause.GetInputText()));
}
return(derivedTableNode);
}
public static QsiTableNode VisitSelectStatement(SelectStatementContext context)
{
switch (context.children[0])
{
case QueryExpressionContext queryExpression:
var commonContext = new CommonQueryContext(queryExpression, context.lockingClauseList());
return(VisitQueryExpression(commonContext));
case QueryExpressionParensContext queryExpressionParens:
return(VisitQueryExpressionParens(queryExpressionParens));
case SelectStatementWithIntoContext selectStatementWithInto:
return(VisitSelectStatementWithInto(selectStatementWithInto));
default:
throw TreeHelper.NotSupportedTree(context.children[0]);
}
}
public static QsiTableNode VisitSelectStatement(SelectStatementContext context)
{
return(VisitCommonSelectStatement(new CommonSelectStatementContext(context)));
}
/// <summary>
/// build the XPTNode of a select statement
/// </summary>
/// <param name="ctx"></param>
/// <returns></returns>
public bool BuildXPTNode(SelectStatementContext ctx)
{
return true;
}
/// <summary>
/// build the XPTNode of a select statement
/// </summary>
/// <param name="ctx"></param>
/// <returns></returns>
public bool BuildXPTNode(SelectStatementContext ctx)
{
return(true);
}