private string FormatInQuery(string exp, object[] array, SubqueryParts query)
{
if (array.Length == 0)
{
return("false");
}
if (array.Length == 1 && array[0] == null)
{
return(exp + " IS NULL ");
}
var qsre = query.Selector as QuerySourceReferenceExpression;
if (qsre != null && qsre.ReferencedQuerySource.Equals(query.MainFrom) &&
NpgsqlTypes.TypeConverter.CanConvert(query.MainFrom.ItemType))
{
//TODO: values
return(array.Length == 1
? exp + " = " + NpgsqlTypes.TypeConverter.Convert(query.MainFrom.ItemType, array[0])
: exp + " IN ("
+ string.Join(
",",
array.Select(it => NpgsqlTypes.TypeConverter.Convert(query.MainFrom.ItemType, it)))
+ ")");
}
return(exp + " IN (SELECT " + query.GetSqlExpression(query.Selector)
+ " FROM unnest(" + query.FormatArray(array) + ") \"" + query.MainFrom.ItemName + "\")");
}
private string SimplifyExpression(QueryParts query, SubqueryParts parts, string exp, Expression e)
{
var source = query.GetSqlExpression(e);
var qsre = parts.Selector as QuerySourceReferenceExpression;
if (qsre != null && qsre.ReferencedQuerySource.Equals(query.MainFrom))
{
return(exp + " = ANY(" + source + ")");
}
return(exp + " IN (SELECT " + query.GetSqlExpression(parts.Selector) + " FROM unnest(" + source + ") \"" + query.MainFrom.ItemName + "\")");
}
private string SimplifyConstantExpression(QueryParts query, SubqueryParts parts, string exp, ConstantExpression ce)
{
if (ce.Type.IsArray || ce.Value is Array)
{
var array = ((Array)ce.Value).Cast <object>().ToArray();
return(FormatInQuery(exp, array, parts));
}
else if (ce.Value is IEnumerable)
{
var array = ((IEnumerable)ce.Value).Cast <object>().ToArray();
return(FormatInQuery(exp, array, parts));
}
return(exp + " = " + query.FormatObject(ce.Value));
}
public static SelectSubqueryData Create(QueryParts parts, SubqueryParts subquery)
{
Contract.Requires(parts != null);
Contract.Requires(subquery != null);
var selects = new List <KeyValuePair <IQuerySource, Func <object, BufferedTextReader, object> > >();
foreach (var s in subquery.Selects)
{
var factory = QuerySourceConverterFactory.Create(s.QuerySource, parts);
selects.Add(new KeyValuePair <IQuerySource, Func <object, BufferedTextReader, object> >(factory.QuerySource, factory.Instancer));
}
return(new SelectSubqueryData(selects));
}
protected override Expression VisitSubQueryExpression(SubQueryExpression expression)
{
var sqParts = new SubqueryParts(Query, expression.QueryModel.SelectClause.Selector, Query.Context);
var sq = SubqueryGeneratorQueryModelVisitor.ParseSubquery(expression.QueryModel, sqParts);
if (!Query.CanQueryInMemory)
{
Query.AddSelectPart(
null,
"(" + sq.BuildSqlString(true) + ")",
null,
expression.QueryModel.ResultTypeOverride ?? expression.QueryModel.SelectClause.Selector.Type,
null);
}
return(expression);
}
private string SimplifyMemberExpression(QueryParts query, SubqueryParts parts, string exp, MemberExpression ma)
{
return(exp + " IN (SELECT " + query.GetSqlExpression(parts.Selector)
+ " FROM unnest(" + query.GetSqlExpression(ma) + ") \"" + query.MainFrom.ItemName + "\")");
}
private SubquerySelectExpressionTreeVisitor(SubqueryParts query)
{
this.Query = query;
}
public static void ProcessExpression(Expression linqExpression, SubqueryParts query)
{
var visitor = new SubquerySelectExpressionTreeVisitor(query);
visitor.VisitExpression(linqExpression);
}
private SubqueryGeneratorQueryModelVisitor(QueryParts parentQuery, bool canQueryInMemory, Expression selector, string contextName)
{
QueryParts = new SubqueryParts(parentQuery, canQueryInMemory, selector, contextName);
}
private static Func <string, T> ProjectNew <T>(NewExpression nex, QueryParts parts, SubqueryParts subquery)
{
var results = new Dictionary <Expression, Func <object, object> >();
var list = new List <Func <object, object> >();
foreach (var s in subquery.Selects)
{
var factory = CreateResult(s.Name, s.ItemType, s.QuerySource, parts, true);
if (s.Expression == null)
{
throw new FrameworkException("Null expression!?");
}
results[s.Expression] = factory.Instancer;
list.Add(factory.Instancer);
}
var arguments = new object[nex.Arguments.Count];
Func <string, T> result = value =>
{
//TODO fix later
//if (value == null)
return(default(T));
/*var items = OracleRecordConverter.ParseRecord(value);
* for (int i = 0; i < items.Length; i++)
* arguments[i] = list[i](items[i]);
*
* return (T)nex.Constructor.Invoke(arguments);*/
};
return(result);
}
private static Func <string, T> ProjectMapping <T>(SubQueryExpression sqe, QueryParts parts, SubqueryParts subquery)
{
Func <string, T> result;
var projector = ProjectorBuildingExpressionTreeVisitor <T> .BuildProjector(sqe.QueryModel);
if (subquery.Selects.Count == 1)
{
var sel = subquery.Selects[0];
var factory = CreateResult(sel.Name, sel.ItemType, sel.QuerySource, parts, true);
result = value => (T)factory.Instancer(value);
}
else
{
var ssd = SelectSubqueryData.Create(parts, subquery);
result = value =>
{
//TODO fix later
return(default(T));
/*
* var items = OracleRecordConverter.ParseRecord(value);
* var rom = ssd.ProcessRow(null, items);
* var res = projector(rom);
* return res;*/
};
}
return(result);
}
private static Func <string, T> ProjectMapping <T>(SubQueryExpression sqe, QueryParts parts, SubqueryParts subquery)
{
var ssd = SelectSubqueryData.Create(parts, subquery);
var projector = ProjectorBuildingExpressionTreeVisitor <T> .BuildProjector(sqe.QueryModel);
//TODO TextReader/string !?
Func <string, T> result = value =>
{
var items = PostgresRecordConverter.ParseRecord(value);
var rom = ssd.ProcessRow(null, items);
var res = projector(rom);
return(res);
};
return(result);
}
private static Func <string, BufferedTextReader, T> ProjectMapping <T>(SubQueryExpression sqe, QueryParts parts, SubqueryParts subquery)
{
Func <string, BufferedTextReader, T> result;
var projector = ProjectorBuildingExpressionTreeVisitor <T> .BuildProjector(sqe.QueryModel);
if (subquery.Selects.Count == 1)
{
var sel = subquery.Selects[0];
var factory = CreateResult(sel.Name, sel.ItemType, sel.QuerySource, parts);
result = (value, reader) => (T)factory.Instancer(value, reader);
}
else
{
var ssd = SelectSubqueryData.Create(parts, subquery);
//TODO TextReader/string !?
result = (value, reader) =>
{
var items = PostgresRecordConverter.ParseRecord(value);
var rom = ssd.ProcessRow(null, reader, items);
var res = projector(rom);
return(res);
};
}
return(result);
}
private static Func <string, T> ProjectMapping <T>(SubQueryExpression sqe, QueryParts parts, SubqueryParts subquery)
{
var ssd = SelectSubqueryData.Create(parts, subquery);
var projector = ProjectorBuildingExpressionTreeVisitor <T> .BuildProjector(sqe.QueryModel);
Func <string, T> result = value =>
{
//TODO fix later
return(default(T));
/*
* var items = OracleRecordConverter.ParseRecord(value);
* var rom = ssd.ProcessRow(null, items);
* var res = projector(rom);
* return res;*/
};
return(result);
}