protected override IBuildContext BuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo)
{
var sequence = builder.BuildSequence(new BuildInfo(buildInfo, methodCall.Arguments[0]));
var collectionSelector = (LambdaExpression)methodCall.Arguments[1].Unwrap();
var resultSelector = (LambdaExpression)methodCall.Arguments[2].Unwrap();
if (!sequence.SqlQuery.GroupBy.IsEmpty)
{
sequence = new SubQueryContext(sequence);
}
var context = new SelectManyContext(buildInfo.Parent, collectionSelector, sequence);
var expr = collectionSelector.Body.Unwrap();
var collectionInfo = new BuildInfo(context, expr, new SqlQuery());
var collection = builder.BuildSequence(collectionInfo);
var leftJoin = collection is DefaultIfEmptyBuilder.DefaultIfEmptyContext;
var sql = collection.SqlQuery;
var sequenceTable = sequence.SqlQuery.From.Tables[0].Source;
var newQuery = null != new QueryVisitor().Find(sql, e => e == collectionInfo.SqlQuery);
var crossApply = null != new QueryVisitor().Find(sql, e =>
e == sequenceTable ||
e.ElementType == QueryElementType.SqlField && sequenceTable == ((SqlField)e).Table ||
e.ElementType == QueryElementType.Column && sequenceTable == ((SqlQuery.Column)e).Parent);
if (collection is JoinBuilder.GroupJoinSubQueryContext)
{
var groupJoin = ((JoinBuilder.GroupJoinSubQueryContext)collection).GroupJoin;
groupJoin.SqlQuery.From.Tables[0].Joins[0].JoinType = SqlQuery.JoinType.Inner;
groupJoin.SqlQuery.From.Tables[0].Joins[0].IsWeak = false;
}
if (!newQuery)
{
context.Collection = new SubQueryContext(collection, sequence.SqlQuery, false);
return(new SelectContext(buildInfo.Parent, resultSelector, sequence, context));
}
if (!crossApply)
{
if (!leftJoin)
{
context.Collection = new SubQueryContext(collection, sequence.SqlQuery, true);
return(new SelectContext(buildInfo.Parent, resultSelector, sequence, context));
}
else
{
var join = SqlQuery.OuterApply(sql);
sequence.SqlQuery.From.Tables[0].Joins.Add(join.JoinedTable);
context.Collection = new SubQueryContext(collection, sequence.SqlQuery, false);
return(new SelectContext(buildInfo.Parent, resultSelector, sequence, context));
}
}
if (collection is TableBuilder.TableContext)
{
var table = (TableBuilder.TableContext)collection;
var join = table.SqlTable.TableArguments != null && table.SqlTable.TableArguments.Length > 0 ?
leftJoin ? SqlQuery.OuterApply(sql) : SqlQuery.CrossApply(sql) :
leftJoin?SqlQuery.LeftJoin(sql) : SqlQuery.InnerJoin(sql);
join.JoinedTable.Condition.Conditions.AddRange(sql.Where.SearchCondition.Conditions);
sql.Where.SearchCondition.Conditions.Clear();
var collectionParent = collection.Parent as TableBuilder.TableContext;
// Association.
//
if (collectionParent != null && collectionInfo.IsAssociationBuilt)
{
var ts = (SqlQuery.TableSource) new QueryVisitor().Find(sequence.SqlQuery.From, e =>
{
if (e.ElementType == QueryElementType.TableSource)
{
var t = (SqlQuery.TableSource)e;
return(t.Source == collectionParent.SqlTable);
}
return(false);
});
ts.Joins.Add(join.JoinedTable);
}
else
{
sequence.SqlQuery.From.Tables[0].Joins.Add(join.JoinedTable);
}
context.Collection = new SubQueryContext(collection, sequence.SqlQuery, false);
return(new SelectContext(buildInfo.Parent, resultSelector, sequence, context));
}
else
{
var join = leftJoin ? SqlQuery.OuterApply(sql) : SqlQuery.CrossApply(sql);
sequence.SqlQuery.From.Tables[0].Joins.Add(join.JoinedTable);
context.Collection = new SubQueryContext(collection, sequence.SqlQuery, false);
return(new SelectContext(buildInfo.Parent, resultSelector, sequence, context));
}
}
protected override IBuildContext BuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo)
{
var sequence = builder.BuildSequence(new BuildInfo(buildInfo, methodCall.Arguments[0]));
var collectionSelector = (LambdaExpression)methodCall.Arguments[1].Unwrap();
var resultSelector = (LambdaExpression)methodCall.Arguments[2].Unwrap();
if (!sequence.SelectQuery.GroupBy.IsEmpty ||
sequence.SelectQuery.Select.TakeValue != null ||
sequence.SelectQuery.Select.SkipValue != null ||
sequence.SelectQuery.Select.IsDistinct)
{
sequence = new SubQueryContext(sequence);
}
var context = new SelectManyContext(buildInfo.Parent, collectionSelector, sequence);
var expr = collectionSelector.Body.Unwrap();
var collectionInfo = new BuildInfo(context, expr, new SelectQuery());
var collection = builder.BuildSequence(collectionInfo);
var leftJoin = collection is DefaultIfEmptyBuilder.DefaultIfEmptyContext || collectionInfo.JoinType == SelectQuery.JoinType.Left;
var sql = collection.SelectQuery;
var sequenceTables = new HashSet <ISqlTableSource>(sequence.SelectQuery.From.Tables[0].GetTables());
var newQuery = null != QueryVisitor.Find(sql, e => e == collectionInfo.SelectQuery);
var crossApply = null != QueryVisitor.Find(sql, e =>
e.ElementType == QueryElementType.TableSource && sequenceTables.Contains((ISqlTableSource)e) ||
e.ElementType == QueryElementType.SqlField && sequenceTables.Contains(((SqlField)e).Table) ||
e.ElementType == QueryElementType.Column && sequenceTables.Contains(((SelectQuery.Column)e).Parent));
if (collection is JoinBuilder.GroupJoinSubQueryContext)
{
var groupJoin = ((JoinBuilder.GroupJoinSubQueryContext)collection).GroupJoin;
groupJoin.SelectQuery.From.Tables[0].Joins[0].JoinType = SelectQuery.JoinType.Inner;
groupJoin.SelectQuery.From.Tables[0].Joins[0].IsWeak = false;
}
if (!newQuery)
{
if (collection.SelectQuery.Select.HasModifier)
{
if (crossApply)
{
var foundJoin = context.SelectQuery.FindJoin(j => j.Table.Source == collection.SelectQuery);
if (foundJoin != null)
{
foundJoin.JoinType = leftJoin ? SelectQuery.JoinType.OuterApply : SelectQuery.JoinType.CrossApply;
collection.SelectQuery.Where.ConcatSearchCondition(foundJoin.Condition);
((ISqlExpressionWalkable)collection.SelectQuery.Where).Walk(false, e =>
{
var column = e as SelectQuery.Column;
if (column != null)
{
if (column.Parent == collection.SelectQuery)
{
return(column.UnderlyingColumn);
}
}
return(e);
});
foundJoin.Condition.Conditions.Clear();
}
}
}
context.Collection = new SubQueryContext(collection, sequence.SelectQuery, false);
return(new SelectContext(buildInfo.Parent, resultSelector, sequence, context));
}
if (!crossApply)
{
if (!leftJoin)
{
context.Collection = new SubQueryContext(collection, sequence.SelectQuery, true);
return(new SelectContext(buildInfo.Parent, resultSelector, sequence, context));
}
else
{
var join = SelectQuery.OuterApply(sql);
sequence.SelectQuery.From.Tables[0].Joins.Add(join.JoinedTable);
context.Collection = new SubQueryContext(collection, sequence.SelectQuery, false);
return(new SelectContext(buildInfo.Parent, resultSelector, sequence, context));
}
}
var joinType = collectionInfo.JoinType;
if (collection is TableBuilder.TableContext)
{
// if (collectionInfo.IsAssociationBuilt)
// {
// context.Collection = new SubQueryContext(collection, sequence.SelectQuery, false);
// return new SelectContext(buildInfo.Parent, resultSelector, sequence, context);
// }
if (joinType == SelectQuery.JoinType.Auto)
{
var table = (TableBuilder.TableContext)collection;
var isApplyJoin = collection.SelectQuery.Select.HasModifier ||
table.SqlTable.TableArguments != null && table.SqlTable.TableArguments.Length > 0;
joinType = isApplyJoin
? (leftJoin ? SelectQuery.JoinType.OuterApply : SelectQuery.JoinType.CrossApply)
: (leftJoin ? SelectQuery.JoinType.Left : SelectQuery.JoinType.Inner);
}
var join = CreateJoin(joinType, sql);
join.JoinedTable.CanConvertApply = false;
if (!(joinType == SelectQuery.JoinType.CrossApply || joinType == SelectQuery.JoinType.OuterApply))
{
join.JoinedTable.Condition.Conditions.AddRange(sql.Where.SearchCondition.Conditions);
sql.Where.SearchCondition.Conditions.Clear();
}
var collectionParent = collection.Parent as TableBuilder.TableContext;
// Association.
//
if (collectionParent != null && collectionInfo.IsAssociationBuilt)
{
var ts = (SelectQuery.TableSource)QueryVisitor.Find(sequence.SelectQuery.From, e =>
{
if (e.ElementType == QueryElementType.TableSource)
{
var t = (SelectQuery.TableSource)e;
return(t.Source == collectionParent.SqlTable);
}
return(false);
});
ts.Joins.Add(join.JoinedTable);
}
else
{
//if (collectionInfo.IsAssociationBuilt)
//{
// collectionInfo.AssosiationContext.ParentAssociationJoin.IsWeak = false;
//}
//else
{
sequence.SelectQuery.From.Tables[0].Joins.Add(join.JoinedTable);
}
}
context.Collection = new SubQueryContext(collection, sequence.SelectQuery, false);
return(new SelectContext(buildInfo.Parent, resultSelector, sequence, context));
}
else
{
if (joinType == SelectQuery.JoinType.Auto)
{
joinType = leftJoin ? SelectQuery.JoinType.OuterApply : SelectQuery.JoinType.CrossApply;
}
var join = CreateJoin(joinType, sql);
if (!(joinType == SelectQuery.JoinType.CrossApply || joinType == SelectQuery.JoinType.OuterApply))
{
join.JoinedTable.Condition.Conditions.AddRange(sql.Where.SearchCondition.Conditions);
sql.Where.SearchCondition.Conditions.Clear();
}
sequence.SelectQuery.From.Tables[0].Joins.Add(join.JoinedTable);
context.Collection = new SubQueryContext(collection, sequence.SelectQuery, false);
return(new SelectContext(buildInfo.Parent, resultSelector, sequence, context));
}
}
protected override IBuildContext BuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo)
{
var sequence = builder.BuildSequence(new BuildInfo(buildInfo, methodCall.Arguments[0]));
var collectionSelector = (LambdaExpression)methodCall.Arguments[1].Unwrap();
var resultSelector = (LambdaExpression)methodCall.Arguments[2].Unwrap();
if (sequence.SelectQuery.HasUnion || !sequence.SelectQuery.IsSimple)
{
sequence = new SubQueryContext(sequence);
}
var expr = collectionSelector.Body.Unwrap();
DefaultIfEmptyBuilder.DefaultIfEmptyContext defaultIfEmpty = null;
if (expr is MethodCallExpression mc && AllJoinsBuilder.IsMatchingMethod(mc, true))
{
defaultIfEmpty = new DefaultIfEmptyBuilder.DefaultIfEmptyContext(buildInfo.Parent, sequence, null);
defaultIfEmpty.Disabled = true;
sequence = new SubQueryContext(defaultIfEmpty);
}
var context = new SelectManyContext(buildInfo.Parent, collectionSelector, sequence);
context.SetAlias(collectionSelector.Parameters[0].Name);
var collectionInfo = new BuildInfo(context, expr, new SelectQuery());
var collection = builder.BuildSequence(collectionInfo);
if (resultSelector.Parameters.Count > 1)
{
collection.SetAlias(resultSelector.Parameters[1].Name);
}
if (defaultIfEmpty != null && (collectionInfo.JoinType == JoinType.Right || collectionInfo.JoinType == JoinType.Full))
{
defaultIfEmpty.Disabled = false;
}
var leftJoin = collection is DefaultIfEmptyBuilder.DefaultIfEmptyContext || collectionInfo.JoinType == JoinType.Left;
var sql = collection.SelectQuery;
var sequenceTables = new HashSet <ISqlTableSource>(sequence.SelectQuery.From.Tables[0].GetTables());
var newQuery = null != QueryVisitor.Find(sql, e => e == collectionInfo.SelectQuery);
var crossApply = null != QueryVisitor.Find(sql, e =>
e.ElementType == QueryElementType.TableSource && sequenceTables.Contains((ISqlTableSource)e) ||
e.ElementType == QueryElementType.SqlField && sequenceTables.Contains(((SqlField)e).Table) ||
e.ElementType == QueryElementType.Column && sequenceTables.Contains(((SqlColumn)e).Parent));
if (collection is JoinBuilder.GroupJoinSubQueryContext queryContext)
{
var groupJoin = queryContext.GroupJoin;
groupJoin.SelectQuery.From.Tables[0].Joins[0].JoinType = JoinType.Inner;
groupJoin.SelectQuery.From.Tables[0].Joins[0].IsWeak = false;
}
if (!newQuery)
{
if (collection.SelectQuery.Select.HasModifier)
{
if (crossApply)
{
var foundJoin = context.SelectQuery.FindJoin(j => j.Table.Source == collection.SelectQuery);
if (foundJoin != null)
{
foundJoin.JoinType = leftJoin ? JoinType.OuterApply : JoinType.CrossApply;
collection.SelectQuery.Where.ConcatSearchCondition(foundJoin.Condition);
((ISqlExpressionWalkable)collection.SelectQuery.Where).Walk(new WalkOptions(), e =>
{
if (e is SqlColumn column)
{
if (column.Parent == collection.SelectQuery)
{
return(column.UnderlyingColumn);
}
}
return(e);
});
foundJoin.Condition.Conditions.Clear();
}
}
}
context.Collection = new SubQueryContext(collection, sequence.SelectQuery, false);
return(new SelectContext(buildInfo.Parent, resultSelector, sequence, context));
}
if (!crossApply)
{
if (!leftJoin)
{
context.Collection = new SubQueryContext(collection, sequence.SelectQuery, true);
return(new SelectContext(buildInfo.Parent, resultSelector, sequence, context));
}
else
{
var join = sql.OuterApply();
sequence.SelectQuery.From.Tables[0].Joins.Add(join.JoinedTable);
context.Collection = new SubQueryContext(collection, sequence.SelectQuery, false);
return(new SelectContext(buildInfo.Parent, resultSelector, sequence, context));
}
}
void MoveSearchConditionsToJoin(SqlFromClause.Join join)
{
var tableSources = new HashSet <ISqlTableSource>();
((ISqlExpressionWalkable)sql.Where.SearchCondition).Walk(new WalkOptions(), e =>
{
if (e is ISqlTableSource ts && !tableSources.Contains(ts))
{
tableSources.Add(ts);
}
return(e);
});
bool ContainsTable(ISqlTableSource tbl, IQueryElement qe)
{
return(null != QueryVisitor.Find(qe, e =>
e == tbl ||
e.ElementType == QueryElementType.SqlField && tbl == ((SqlField)e).Table ||
e.ElementType == QueryElementType.Column && tbl == ((SqlColumn)e).Parent));
}
var conditions = sql.Where.SearchCondition.Conditions;
if (conditions.Count > 0)
{
for (var i = conditions.Count - 1; i >= 0; i--)
{
var condition = conditions[i];
if (!tableSources.Any(ts => ContainsTable(ts, condition)))
{
join.JoinedTable.Condition.Conditions.Insert(0, condition);
conditions.RemoveAt(i);
}
}
}
}
protected override IBuildContext BuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall,
BuildInfo buildInfo)
{
var sequence = builder.BuildSequence(new BuildInfo(buildInfo, methodCall.Arguments[0]));
var collectionSelector = (LambdaExpression)methodCall.Arguments[1].Unwrap();
var resultSelector = (LambdaExpression)methodCall.Arguments[2].Unwrap();
if (!sequence.Select.GroupBy.IsEmpty)
{
sequence = new SubQueryContext(sequence);
}
var context = new SelectManyContext(buildInfo.Parent, collectionSelector, sequence);
var expr = collectionSelector.Body.Unwrap();
var collectionInfo = new BuildInfo(context, expr, new SelectQuery());
var collection = builder.BuildSequence(collectionInfo);
var leftJoin = collection is DefaultIfEmptyBuilder.DefaultIfEmptyContext;
var sql = collection.Select;
var sequenceTables = new HashSet <ISqlTableSource>(sequence.Select.From.Tables.First.Value.GetTables());
var newQuery = sql != collectionInfo.SelectQuery &&
QueryVisitor.FindFirstOrDefault <ISelectQuery>(sql, e => e == collectionInfo.SelectQuery) ==
null;
var crossApply = null !=
QueryVisitor.FindFirstOrDefault <IQueryExpression>(
sql,
e =>
e.ElementType == EQueryElementType.TableSource &&
sequenceTables.Contains((ISqlTableSource)e) ||
e.ElementType == EQueryElementType.SqlField &&
sequenceTables.Contains(((ISqlField)e).Table) ||
e.ElementType == EQueryElementType.Column &&
sequenceTables.Contains(((IColumn)e).Parent));
var groupJoinSubQueryContext = collection as JoinBuilder.GroupJoinSubQueryContext;
if (groupJoinSubQueryContext != null)
{
var groupJoin = groupJoinSubQueryContext.GroupJoin;
var joinedTables = groupJoin.Select.From.Tables.First.Value.Joins.First.Value;
joinedTables.JoinType = EJoinType.Inner;
joinedTables.IsWeak = false;
}
if (newQuery)
{
context.Collection = new SubQueryContext(collection, sequence.Select, false);
return(new SelectContext(buildInfo.Parent, resultSelector, sequence, context));
}
if (!crossApply)
{
if (!leftJoin)
{
context.Collection = new SubQueryContext(collection, sequence.Select, true);
return(new SelectContext(buildInfo.Parent, resultSelector, sequence, context));
}
var join = SelectQuery.OuterApply(sql);
sequence.Select.From.Tables.First.Value.Joins.AddLast(join.JoinedTable);
context.Collection = new SubQueryContext(collection, sequence.Select, false);
return(new SelectContext(buildInfo.Parent, resultSelector, sequence, context));
}
var tableContext = collection as TableBuilder.TableContext;
if (tableContext != null)
{
var join = tableContext.SqlTable.TableArguments != null &&
tableContext.SqlTable.TableArguments.Count > 0
? (leftJoin
? SelectQuery.OuterApply(sql)
: SelectQuery.CrossApply(sql))
: (leftJoin
? SelectQuery.LeftJoin(sql)
: SelectQuery.InnerJoin(sql));
join.JoinedTable.Condition.Conditions.AddRange(sql.Where.Search.Conditions);
join.JoinedTable.CanConvertApply = false;
sql.Where.Search.Conditions.Clear();
var collectionParent = collection.Parent as TableBuilder.TableContext;
// Association.
//
if (collectionParent != null && collectionInfo.IsAssociationBuilt)
{
QueryVisitor.FindFirstOrDefault <ITableSource>(sequence.Select.From,
t => t.Source == collectionParent.SqlTable);
}
else
{
sequence.Select.From.Tables.First.Value.Joins.AddLast(join.JoinedTable);
}
context.Collection = new SubQueryContext(collection, sequence.Select, false);
return(new SelectContext(buildInfo.Parent, resultSelector, sequence, context));
}
else
{
var join = leftJoin
? SelectQuery.OuterApply(sql)
: SelectQuery.CrossApply(sql);
sequence.Select.From.Tables.First.Value.Joins.AddLast(join.JoinedTable);
context.Collection = new SubQueryContext(collection, sequence.Select, false);
return(new SelectContext(buildInfo.Parent, resultSelector, sequence, context));
}
}
protected override IParseContext ParseMethodCall(ExpressionParser parser, IParseContext parent, MethodCallExpression methodCall, SqlQuery sqlQuery)
{
var sequence = parser.ParseSequence(parent, methodCall.Arguments[0], sqlQuery);
var collectionSelector = (LambdaExpression)methodCall.Arguments[1].Unwrap();
var resultSelector = (LambdaExpression)methodCall.Arguments[2].Unwrap();
//if (collectionSelector.Parameters[0] == collectionSelector.Body.Unwrap())
//{
// return resultSelector == null ? sequence : new SelectContext(resultSelector, sequence, sequence);
//}
var context = new SelectManyContext(collectionSelector, sequence);
var expr = collectionSelector.Body.Unwrap();
var crossApply = null != expr.Find(e => e == collectionSelector.Parameters[0]);
/*
* if (expr.NodeType == ExpressionType.Call)
* {
* var call = (MethodCallExpression)collectionSelector.Body;
*
* if (call.IsQueryable("DefaultIfEmpty"))
* {
* leftJoin = true;
* expr = call.Arguments[0];
* }
* }
*/
parser.SubQueryParsingCounter++;
var collection = parser.ParseSequence(context, expr, new SqlQuery());
parser.SubQueryParsingCounter--;
var leftJoin = collection is DefaultIfEmptyParser.DefaultIfEmptyContext;
var sql = collection.SqlQuery;
if (!leftJoin && crossApply)
{
if (sql.GroupBy.IsEmpty &&
sql.Select.Columns.Count == 0 &&
!sql.Select.HasModifier &&
sql.Where.IsEmpty &&
!sql.HasUnion &&
sql.From.Tables.Count == 1)
{
crossApply = false;
}
}
if (!leftJoin && !crossApply)
{
sequence.SqlQuery.From.Table(sql);
//sql.ParentSql = sequence.SqlQuery;
var col = (IParseContext) new SubQueryContext(collection, sequence.SqlQuery, true);
return(new SelectContext(resultSelector, sequence, col));
}
//if (crossApply)
{
if (sql.GroupBy.IsEmpty &&
sql.Select.Columns.Count == 0 &&
!sql.Select.HasModifier &&
//!sql.Where.IsEmpty &&
!sql.HasUnion && sql.From.Tables.Count == 1)
{
var join = leftJoin ? SqlQuery.LeftJoin(sql) : SqlQuery.InnerJoin(sql);
join.JoinedTable.Condition.Conditions.AddRange(sql.Where.SearchCondition.Conditions);
sql.Where.SearchCondition.Conditions.Clear();
if (collection is TableParser.TableContext)
{
var collectionParent = collection.Parent as TableParser.TableContext;
if (collectionParent != null)
{
var ts = (SqlQuery.TableSource) new QueryVisitor().Find(sequence.SqlQuery.From, e =>
{
if (e.ElementType == QueryElementType.TableSource)
{
var t = (SqlQuery.TableSource)e;
return(t.Source == collectionParent.SqlTable);
}
return(false);
});
ts.Joins.Add(join.JoinedTable);
}
else
{
sequence.SqlQuery.From.Tables[0].Joins.Add(join.JoinedTable);
}
}
else
{
sequence.SqlQuery.From.Tables[0].Joins.Add(join.JoinedTable);
//collection.SqlQuery = sequence.SqlQuery;
}
//sql.ParentSql = sequence.SqlQuery;
var col = (IParseContext) new SubQueryContext(collection, sequence.SqlQuery, false);
return(new SelectContext(resultSelector, sequence, col));
}
}
throw new LinqException("Sequence '{0}' cannot be converted to SQL.", expr);
}
protected override IParseContext ParseMethodCall(ExpressionParser parser, IParseContext parent, MethodCallExpression methodCall, SqlQuery sqlQuery)
{
var sequence = parser.ParseSequence(parent, methodCall.Arguments[0], sqlQuery);
var collectionSelector = (LambdaExpression)methodCall.Arguments[1].Unwrap();
var resultSelector = (LambdaExpression)methodCall.Arguments[2].Unwrap();
//if (collectionSelector.Parameters[0] == collectionSelector.Body.Unwrap())
//{
// return resultSelector == null ? sequence : new SelectContext(resultSelector, sequence, sequence);
//}
var context = new SelectManyContext(collectionSelector, sequence);
var expr = collectionSelector.Body.Unwrap();
var crossApply = null != expr.Find(e => e == collectionSelector.Parameters[0]);
/*
if (expr.NodeType == ExpressionType.Call)
{
var call = (MethodCallExpression)collectionSelector.Body;
if (call.IsQueryable("DefaultIfEmpty"))
{
leftJoin = true;
expr = call.Arguments[0];
}
}
*/
parser.SubQueryParsingCounter++;
var collection = parser.ParseSequence(context, expr, new SqlQuery());
parser.SubQueryParsingCounter--;
var leftJoin = collection is DefaultIfEmptyParser.DefaultIfEmptyContext;
var sql = collection.SqlQuery;
if (!leftJoin && crossApply)
{
if (sql.GroupBy.IsEmpty &&
sql.Select.Columns.Count == 0 &&
!sql.Select.HasModifier &&
sql.Where.IsEmpty &&
!sql.HasUnion &&
sql.From.Tables.Count == 1)
{
crossApply = false;
}
}
if (!leftJoin && !crossApply)
{
sequence.SqlQuery.From.Table(sql);
//sql.ParentSql = sequence.SqlQuery;
var col = (IParseContext)new SubQueryContext(collection, sequence.SqlQuery, true);
return new SelectContext(resultSelector, sequence, col);
}
//if (crossApply)
{
if (sql.GroupBy.IsEmpty &&
sql.Select.Columns.Count == 0 &&
!sql.Select.HasModifier &&
//!sql.Where.IsEmpty &&
!sql.HasUnion && sql.From.Tables.Count == 1)
{
var join = leftJoin ? SqlQuery.LeftJoin(sql) : SqlQuery.InnerJoin(sql);
join.JoinedTable.Condition.Conditions.AddRange(sql.Where.SearchCondition.Conditions);
sql.Where.SearchCondition.Conditions.Clear();
if (collection is TableParser.TableContext)
{
var collectionParent = collection.Parent as TableParser.TableContext;
if (collectionParent != null)
{
var ts = (SqlQuery.TableSource)new QueryVisitor().Find(sequence.SqlQuery.From, e =>
{
if (e.ElementType == QueryElementType.TableSource)
{
var t = (SqlQuery.TableSource)e;
return t.Source == collectionParent.SqlTable;
}
return false;
});
ts.Joins.Add(join.JoinedTable);
}
else
{
sequence.SqlQuery.From.Tables[0].Joins.Add(join.JoinedTable);
}
}
else
{
sequence.SqlQuery.From.Tables[0].Joins.Add(join.JoinedTable);
//collection.SqlQuery = sequence.SqlQuery;
}
//sql.ParentSql = sequence.SqlQuery;
var col = (IParseContext)new SubQueryContext(collection, sequence.SqlQuery, false);
return new SelectContext(resultSelector, sequence, col);
}
}
throw new LinqException("Sequence '{0}' cannot be converted to SQL.", expr);
}