public override SqlExpression VisitExtractFunction(PlSqlParser.ExtractFunctionContext context)
{
var part = SqlParseName.Simple(context.regular_id());
var exp = Visit(context.concatenationWrapper());
return(SqlExpression.Function("SQL_EXTRACT", new[] { exp, SqlExpression.Constant(SqlObject.String(part)) }));
}
public static SqlQueryExpressionItem BuildColumn(IContext context, PlSqlParser.SelectedElementContext selectedElement)
{
string alias = null;
if (selectedElement.column_alias() != null &&
!selectedElement.column_alias().IsEmpty)
{
alias = SqlParseName.Simple(selectedElement.column_alias());
}
SqlQueryExpressionItem column;
if (selectedElement.expression() != null &&
!selectedElement.expression().IsEmpty)
{
column = new SqlQueryExpressionItem(SqlParseExpression.Build(context, selectedElement.expression()), alias);
}
else if (selectedElement.selectedColumn() != null &&
!selectedElement.selectedColumn().IsEmpty)
{
bool glob = selectedElement.selectedColumn().glob != null;
ObjectName name = SqlParseName.Select(selectedElement.selectedColumn().objectName(), glob);
var exp = SqlExpression.Reference(name);
column = new SqlQueryExpressionItem(exp, alias);
}
else
{
throw new ParseCanceledException();
}
return(column);
}
public static SqlParseFunctionArgument Form(IContext context, PlSqlParser.ArgumentContext argument)
{
if (argument == null)
{
return(null);
}
var id = SqlParseName.Simple(argument.id());
var exp = Parsing.SqlParseExpression.Build(context, argument.expressionWrapper());
return(new SqlParseFunctionArgument {
Id = id,
Expression = exp
});
}
private static SqlQueryExpression Form(IContext context, PlSqlParser.QueryBlockContext queryBlock, out SqlParseIntoClause into)
{
var fromClause = FromClauseBuilder.Build(context, queryBlock.fromClause());
SqlQueryExpressionItem[] columns;
if (queryBlock.all != null)
{
columns = new[] { new SqlQueryExpressionItem(SqlExpression.Reference(new ObjectName("*"))) };
}
else
{
columns = queryBlock.selectedElement().Select(x => SelectElement.BuildColumn(context, x)).ToArray();
}
var query = new SqlQueryExpression();
foreach (var column in columns)
{
query.Items.Add(column);
}
into = null;
if (queryBlock.DISTINCT() != null ||
queryBlock.UNIQUE() != null)
{
query.Distinct = true;
}
var intoClause = queryBlock.into_clause();
if (intoClause != null)
{
into = new SqlParseIntoClause();
if (intoClause.objectName() != null)
{
into.TableName = SqlParseName.Object(intoClause.objectName());
}
else if (intoClause.variable_name() != null)
{
into.Variables = intoClause.variable_name().Select(SqlParseName.Variable).ToArray();
}
}
if (fromClause != null)
{
query.From = fromClause;
}
var groupBy = queryBlock.groupByClause();
if (groupBy != null && !groupBy.IsEmpty)
{
query.GroupBy = groupBy.groupByElements().expression().Select(x => new SqlExpressionVisitor(context).Visit(x)).ToList();
var having = groupBy.havingClause();
if (having != null)
{
query.Having = new SqlExpressionVisitor(context).Visit(having.condition());
}
}
var groupMax = queryBlock.groupMaxClause();
if (groupMax != null && !groupMax.IsEmpty)
{
var maxColumn = SqlParseName.Object(groupMax.objectName());
query.GroupMax = maxColumn;
}
var whereClause = queryBlock.whereClause();
if (whereClause != null && !whereClause.IsEmpty)
{
var currentOf = whereClause.current_of_clause();
if (currentOf != null && !currentOf.IsEmpty)
{
var cursorName = SqlParseName.Simple(currentOf.cursor_name());
throw new NotImplementedException();
}
else
{
query.Where = new SqlExpressionVisitor(context).Visit(whereClause.conditionWrapper());
}
}
//TODO: in case of a SELECT INTO cause create a statement
return(query);
}