protected virtual void VisitRelation(IDropBuilder expression, IRelationBuilder relation, ITableConfig leftTable, ITableConfig rightTable)
{
this.Builder.AppendFormat("{0} ", this.Database.QueryFactory.Dialect.ALTER);
this.Builder.AppendFormat("{0} ", this.Database.QueryFactory.Dialect.TABLE);
this.Builder.AppendFormat("{0} ", this.Database.QueryFactory.Dialect.Identifier(rightTable.TableName));
this.Builder.AppendFormat("{0} ", this.Database.QueryFactory.Dialect.DROP);
this.Builder.AppendFormat("{0} ", this.Database.QueryFactory.Dialect.CONSTRAINT);
this.Builder.AppendFormat("{0} ", this.Database.QueryFactory.Dialect.Identifier(Conventions.RelationName(leftTable, rightTable)));
}
protected virtual void VisitRelation(IDropBuilder expression, IRelationBuilder relation)
{
switch (relation.Relation.Flags.GetMultiplicity())
{
case RelationFlags.OneToOne:
case RelationFlags.OneToMany:
this.VisitRelation(expression, relation, relation.Relation.LeftTable, relation.Relation.RightTable);
break;
case RelationFlags.ManyToMany:
this.VisitRelation(expression, relation, relation.Relation.LeftTable, relation.Relation.MappingTable);
this.Builder.AppendFormat("{0} ", this.Database.QueryFactory.Dialect.BATCH);
this.VisitRelation(expression, relation, relation.Relation.RightTable, relation.Relation.MappingTable);
break;
default:
throw new NotImplementedException();
}
}
protected override void VisitDrop(IFragmentBuilder parent, IQueryGraphBuilder graph, IDropBuilder expression)
{
this.Push(new SQLiteDropWriter(parent, graph, this.Database, this, this.Parameters));
this.Peek.Write(expression);
this.Pop();
}
protected virtual void VisitIndex(IDropBuilder expression, IIndexBuilder index)
{
this.Builder.AppendFormat("{0} ", this.Database.QueryFactory.Dialect.DROP);
this.Builder.AppendFormat("{0} ", this.Database.QueryFactory.Dialect.INDEX);
this.Builder.AppendFormat("{0} ", this.Database.QueryFactory.Dialect.Identifier(Conventions.IndexName(index.Index)));
}
protected virtual void VisitTable(IDropBuilder expression, ITableBuilder table)
{
this.Builder.AppendFormat("{0} ", this.Database.QueryFactory.Dialect.DROP);
this.Builder.AppendFormat("{0} ", this.Database.QueryFactory.Dialect.TABLE);
this.Visit(table);
}
protected override void VisitRelation(IDropBuilder expression, IRelationBuilder relation)
{
//TODO: SQLite cannot ALTER TABLE DROP FOREIGN KEY which makes this kind of thing tricky.
}
protected override void VisitDrop(IFragmentBuilder parent, IQueryGraphBuilder graph, IDropBuilder expression)
{
//Nothing to do.
}
protected abstract void VisitDrop(IFragmentBuilder parent, IQueryGraphBuilder graph, IDropBuilder expression);
