private void GatherUnionExpressions(SqlNode node, List <SqlExpression> exprs)
{
SqlUnion union = node as SqlUnion;
if (union != null)
{
this.GatherUnionExpressions(union.Left, exprs);
this.GatherUnionExpressions(union.Right, exprs);
}
else
{
SqlSelect sel = node as SqlSelect;
if (sel != null)
{
SqlAliasRef aref = sel.Selection as SqlAliasRef;
if (aref != null)
{
this.GatherUnionExpressions(aref.Alias.Node, exprs);
}
else
{
exprs.Add(sel.Selection);
}
}
}
}
internal override SqlExpression VisitAliasRef(SqlAliasRef aref)
{
SqlNode node = aref.Alias.Node;
if (node is SqlTable || node is SqlTableValuedFunctionCall)
{
return(aref);
}
SqlUnion union = node as SqlUnion;
if (union != null)
{
return(this.ExpandUnion(union));
}
SqlSelect ss = node as SqlSelect;
if (ss != null)
{
return(this.VisitExpression(ss.Selection));
}
SqlExpression exp = node as SqlExpression;
if (exp != null)
{
return(this.VisitExpression(exp));
}
throw Error.CouldNotHandleAliasRef(node.NodeType);
}
internal override SqlExpression VisitAliasRef(SqlAliasRef aref)
{
if (this.ingoreExternalRefs && !this.nodeMap.ContainsKey(aref.Alias))
{
return(aref);
}
return(new SqlAliasRef((SqlAlias)this.Visit(aref.Alias)));
}
internal override SqlExpression VisitAliasRef(SqlAliasRef aref)
{
SqlAlias alias = aref.Alias;
SqlAlias value;
if (this.removedMap.TryGetValue(alias, out value))
{
throw Error.InvalidReferenceToRemovedAliasDuringDeflation();
}
return(aref);
}
internal SqlSelect BuildDefaultQuery(MetaType rowType, bool allowDeferred, SqlLink link, Expression source)
{
if (rowType.HasInheritance && rowType.InheritanceRoot != rowType)
{
throw Error.ArgumentWrongValue("rowType");
}
var sqlTable = sql.Table(rowType.Table, rowType, source);
var sqlAlias = new SqlAlias(sqlTable);
var item = new SqlAliasRef(sqlAlias);
var selection = BuildProjection(item, sqlTable.RowType, allowDeferred, link, source);
return(new SqlSelect(selection, sqlAlias, source));
}
internal override SqlExpression VisitAliasRef(SqlAliasRef aref)
{
if (this.UnwrapSequences != null && this.UnwrapSequences.Unwrap)
{
this.UnwrapSequences = new UnwrapStack(this.UnwrapSequences, false);
this.VisitAlias(aref.Alias);
this.UnwrapSequences = this.UnwrapSequences.Last;
}
else
{
this.VisitAlias(aref.Alias);
}
return(aref);
}
internal SqlSelect BuildDefaultQuery(MetaType rowType, bool allowDeferred, SqlLink link, Expression source)
{
System.Diagnostics.Debug.Assert(rowType != null && rowType.Table != null);
if (rowType.HasInheritance && rowType.InheritanceRoot != rowType)
{
// RowType is expected to be an inheritance root.
throw Error.ArgumentWrongValue("rowType");
}
SqlTable table = sql.Table(rowType.Table, rowType, source);
SqlAlias tableAlias = new SqlAlias(table);
SqlAliasRef tableAliasRef = new SqlAliasRef(tableAlias);
SqlExpression projection = this.BuildProjection(tableAliasRef, table.RowType, allowDeferred, link, source);
return(new SqlSelect(projection, tableAlias, source));
}
internal SqlExpression TranslateEquals(SqlBinary expr)
{
System.Diagnostics.Debug.Assert(
expr.NodeType == SqlNodeType.EQ || expr.NodeType == SqlNodeType.NE ||
expr.NodeType == SqlNodeType.EQ2V || expr.NodeType == SqlNodeType.NE2V);
SqlExpression eLeft = expr.Left;
SqlExpression eRight = expr.Right;
if (eRight.NodeType == SqlNodeType.Element)
{
SqlSubSelect sub = (SqlSubSelect)eRight;
SqlAlias alias = new SqlAlias(sub.Select);
SqlAliasRef aref = new SqlAliasRef(alias);
SqlSelect select = new SqlSelect(aref, alias, expr.SourceExpression);
select.Where = sql.Binary(expr.NodeType, sql.DoNotVisitExpression(eLeft), aref);
return(sql.SubSelect(SqlNodeType.Exists, select));
}
else if (eLeft.NodeType == SqlNodeType.Element)
{
SqlSubSelect sub = (SqlSubSelect)eLeft;
SqlAlias alias = new SqlAlias(sub.Select);
SqlAliasRef aref = new SqlAliasRef(alias);
SqlSelect select = new SqlSelect(aref, alias, expr.SourceExpression);
select.Where = sql.Binary(expr.NodeType, sql.DoNotVisitExpression(eRight), aref);
return(sql.SubSelect(SqlNodeType.Exists, select));
}
MetaType mtLeft = TypeSource.GetSourceMetaType(eLeft, this.services.Model);
MetaType mtRight = TypeSource.GetSourceMetaType(eRight, this.services.Model);
if (eLeft.NodeType == SqlNodeType.TypeCase)
{
eLeft = BestIdentityNode((SqlTypeCase)eLeft);
}
if (eRight.NodeType == SqlNodeType.TypeCase)
{
eRight = BestIdentityNode((SqlTypeCase)eRight);
}
if (mtLeft.IsEntity && mtRight.IsEntity && mtLeft.Table != mtRight.Table)
{
throw Error.CannotCompareItemsAssociatedWithDifferentTable();
}
// do simple or no translation for non-structural types
if (!mtLeft.IsEntity && !mtRight.IsEntity &&
(eLeft.NodeType != SqlNodeType.New || eLeft.SqlType.CanBeColumn) &&
(eRight.NodeType != SqlNodeType.New || eRight.SqlType.CanBeColumn))
{
if (expr.NodeType == SqlNodeType.EQ2V || expr.NodeType == SqlNodeType.NE2V)
{
return(this.TranslateEqualsOp(expr.NodeType, sql.DoNotVisitExpression(expr.Left), sql.DoNotVisitExpression(expr.Right), false));
}
return(expr);
}
// If the two types are not comparable, we return the predicate "1=0".
if ((mtLeft != mtRight) && (mtLeft.InheritanceRoot != mtRight.InheritanceRoot))
{
return(sql.Binary(SqlNodeType.EQ, sql.ValueFromObject(0, expr.SourceExpression), sql.ValueFromObject(1, expr.SourceExpression)));
}
List <SqlExpression> exprs1;
List <SqlExpression> exprs2;
SqlLink link1 = eLeft as SqlLink;
if (link1 != null && link1.Member.IsAssociation && link1.Member.Association.IsForeignKey)
{
exprs1 = link1.KeyExpressions;
}
else
{
exprs1 = this.GetIdentityExpressions(mtLeft, sql.DoNotVisitExpression(eLeft));
}
SqlLink link2 = eRight as SqlLink;
if (link2 != null && link2.Member.IsAssociation && link2.Member.Association.IsForeignKey)
{
exprs2 = link2.KeyExpressions;
}
else
{
exprs2 = this.GetIdentityExpressions(mtRight, sql.DoNotVisitExpression(eRight));
}
System.Diagnostics.Debug.Assert(exprs1.Count > 0);
System.Diagnostics.Debug.Assert(exprs2.Count > 0);
System.Diagnostics.Debug.Assert(exprs1.Count == exprs2.Count);
SqlExpression exp = null;
SqlNodeType eqKind = (expr.NodeType == SqlNodeType.EQ2V || expr.NodeType == SqlNodeType.NE2V) ? SqlNodeType.EQ2V : SqlNodeType.EQ;
for (int i = 0, n = exprs1.Count; i < n; i++)
{
SqlExpression eq = this.TranslateEqualsOp(eqKind, exprs1[i], exprs2[i], !mtLeft.IsEntity);
if (exp == null)
{
exp = eq;
}
else
{
exp = sql.Binary(SqlNodeType.And, exp, eq);
}
}
if (expr.NodeType == SqlNodeType.NE || expr.NodeType == SqlNodeType.NE2V)
{
exp = sql.Unary(SqlNodeType.Not, exp, exp.SourceExpression);
}
return(exp);
}
internal virtual SqlExpression VisitAliasRef(SqlAliasRef aref)
{
return(aref);
}
internal SqlExpression TranslateEquals(SqlBinary expr)
{
var sqlExpression = expr.Left;
var sqlExpression2 = expr.Right;
if (sqlExpression2.NodeType == SqlNodeType.Element)
{
var sqlSubSelect = (SqlSubSelect)sqlExpression2;
var sqlAlias = new SqlAlias(sqlSubSelect.Select);
var sqlAliasRef = new SqlAliasRef(sqlAlias);
var sqlSelect = new SqlSelect(sqlAliasRef, sqlAlias, expr.SourceExpression)
{
Where = sql.Binary(expr.NodeType, sql.DoNotVisitExpression(sqlExpression), sqlAliasRef)
};
return(sql.SubSelect(SqlNodeType.Exists, sqlSelect));
}
if (sqlExpression.NodeType == SqlNodeType.Element)
{
var sqlSubSelect2 = (SqlSubSelect)sqlExpression;
var sqlAlias2 = new SqlAlias(sqlSubSelect2.Select);
var sqlAliasRef2 = new SqlAliasRef(sqlAlias2);
var sqlSelect2 = new SqlSelect(sqlAliasRef2, sqlAlias2, expr.SourceExpression)
{
Where = sql.Binary(expr.NodeType, sql.DoNotVisitExpression(sqlExpression2), sqlAliasRef2)
};
return(sql.SubSelect(SqlNodeType.Exists, sqlSelect2));
}
MetaType sourceMetaType = TypeSource.GetSourceMetaType(sqlExpression, services.Model);
MetaType sourceMetaType2 = TypeSource.GetSourceMetaType(sqlExpression2, services.Model);
if (sqlExpression.NodeType == SqlNodeType.TypeCase)
{
sqlExpression = BestIdentityNode((SqlTypeCase)sqlExpression);
}
if (sqlExpression2.NodeType == SqlNodeType.TypeCase)
{
sqlExpression2 = BestIdentityNode((SqlTypeCase)sqlExpression2);
}
if (sourceMetaType.IsEntity && sourceMetaType2.IsEntity && sourceMetaType.Table != sourceMetaType2.Table)
{
throw Error.CannotCompareItemsAssociatedWithDifferentTable();
}
if (!sourceMetaType.IsEntity && !sourceMetaType2.IsEntity && (sqlExpression.NodeType != SqlNodeType.New || sqlExpression.SqlType.CanBeColumn) && (sqlExpression2.NodeType != SqlNodeType.New || sqlExpression2.SqlType.CanBeColumn))
{
if (expr.NodeType == SqlNodeType.EQ2V || expr.NodeType == SqlNodeType.NE2V)
{
return(TranslateEqualsOp(expr.NodeType, sql.DoNotVisitExpression(expr.Left), sql.DoNotVisitExpression(expr.Right), false));
}
return(expr);
}
if (sourceMetaType != sourceMetaType2 && sourceMetaType.InheritanceRoot != sourceMetaType2.InheritanceRoot)
{
return(sql.Binary(SqlNodeType.EQ, sql.ValueFromObject(0, expr.SourceExpression), sql.ValueFromObject(1, expr.SourceExpression)));
}
var sqlLink = sqlExpression as SqlLink;
var list = (sqlLink == null || !sqlLink.Member.IsAssociation || !sqlLink.Member.Association.IsForeignKey) ? GetIdentityExpressions(sourceMetaType, sql.DoNotVisitExpression(sqlExpression)) : sqlLink.KeyExpressions;
var sqlLink2 = sqlExpression2 as SqlLink;
var list2 = (sqlLink2 == null || !sqlLink2.Member.IsAssociation || !sqlLink2.Member.Association.IsForeignKey) ? GetIdentityExpressions(sourceMetaType2, sql.DoNotVisitExpression(sqlExpression2)) : sqlLink2.KeyExpressions;
SqlExpression sqlExpression3 = null;
var op = (expr.NodeType == SqlNodeType.EQ2V || expr.NodeType == SqlNodeType.NE2V) ? SqlNodeType.EQ2V : SqlNodeType.EQ;
var i = 0;
for (var count = list.Count; i < count; i++)
{
var sqlExpression4 = TranslateEqualsOp(op, list[i], list2[i], !sourceMetaType.IsEntity);
sqlExpression3 = ((sqlExpression3 != null) ? sql.Binary(SqlNodeType.And, sqlExpression3, sqlExpression4) : sqlExpression4);
}
if (expr.NodeType == SqlNodeType.NE || expr.NodeType == SqlNodeType.NE2V)
{
sqlExpression3 = sql.Unary(SqlNodeType.Not, sqlExpression3, sqlExpression3.SourceExpression);
}
return(sqlExpression3);
}
internal override SqlExpression VisitAliasRef(SqlAliasRef aref)
{
throw Error.UnexpectedNode(aref.NodeType);
}