public static TableRef Create(QueryBlock query, Expression expression)
{
if (expression.NodeType.In(ExpressionType.Constant, ExpressionType.MemberAccess))
{
var value = expression.GetValue();
if (value is ITable)
{
return Create(query, (ITable)value);
}
else if (value is ITmpTable)
{
return CreateTmp(query, (IQueryable)value);
}
else if (value is IQueryable)
{
return new QueryBlock(query.QueryBatch, query, ((IQueryable)value).Expression);
}
else
{
throw new NotSupportedException();
}
}
else
{
return new QueryBlock(query.QueryBatch, query, expression);
}
}
public JoinBlock(QueryBlock query, JoinType joinType, TableRef innerRef, StatementBlock on)
{
this.query = query;
JoinType = joinType;
InnerRef = innerRef;
On = on;
}
public QueryBlock(QueryBatch queryBatch, QueryBlock parent, Expression expression) : base(parent)
{
this.QueryBatch = queryBatch ?? parent.QueryBatch;
Cte = new CteBlock(this);
Select = new SelectBlock(this);
Into = new IntoBlock(this);
Where = new WhereBlock(this);
From = new FromBlock(this);
Group = new GroupBlock(this);
Order = new OrderBlock(this);
if (expression != null) Inspect(expression);
}
public void Inspect(Expression innerExpression, LambdaExpression key, LambdaExpression next)
{
topQuery = new QueryBlock(query.QueryBatch, query, innerExpression);
topQuery.QueryMap.Add(new ColumnMap(new TypeMemberPath(lvl), new StatementBlock("1")));
bottomQuery = new QueryBlock(null, query, null);
bottomQuery.From.MainTable = new DummyRef(query, "cte");
var baseQuery = TableRef.Create(bottomQuery, innerExpression);
var resultType = typeof(RecursionEntry<>).MakeGenericType(baseQuery.ResultType);
bottomQuery.QueryMap = new QueryMap(resultType, bottomQuery.From.MainTable.Alias);
//bottomQuery.QueryMap.Add(new ColumnMap(new TypeMemberPath(lvl), new StatementBlock($"[{bottomQuery.From.MainTable.Alias}.{lvl}]")));
CreateJoinExpressionToCte(baseQuery, key, next);
query.QueryMap = new QueryMap();
query.QueryMap.AddRange(baseQuery.QueryMap.RightShift(CtePropertyName));
query.QueryMap.Add(new ColumnMap(new TypeMemberPath(lvl), new StatementBlock(lvl)));
query.From.MainTable = new DummyRef(query, "cte");
}
public CteBlock(QueryBlock query)
{
this.query = query;
}
public GroupBlock(QueryBlock queryBlock)
{
this.queryBlock = queryBlock;
}
public FromBlock(QueryBlock query)
{
this.query = query;
}
public WhereBlock(QueryBlock query)
{
_query = query;
}
public TmpTableRef(QueryBlock parent, Type resultType, string name) : base(parent)
{
_resultType = resultType;
_name = name;
}
public QueryBlock InsertQuery(Expression expression)
{
var result = new QueryBlock(this, null, expression);
queries.Insert(0, result);
return result;
}
public IntoBlock(QueryBlock query)
{
this._query = query;
}
public SelectBlock(QueryBlock query)
{
this.queryBlock = query;
}
protected static TableRef Create(QueryBlock query, ITable table)
{
if (table == null) throw new ArgumentNullException(nameof(table));
return new TableRef(query) { _table = table };
}
protected TableRef(QueryBlock parent)
{
Parent = parent;
}
public DummyRef(QueryBlock parent, string name)
: base(parent)
{
this.name = name;
}
public QueryBlock AddQuery(Expression expresion)
{
var result = new QueryBlock(this, null, expresion);
queries.Add(result);
return result;
}
public OrderBlock(QueryBlock queryBlock)
{
this.queryBlock = queryBlock;
}
protected static TableRef CreateTmp(QueryBlock query, IQueryable tmpTable)
{
var tmpQuery = query.QueryBatch.InsertQuery(tmpTable.Expression);
tmpQuery.Into.Name = query.QueryBatch.GenerateTempTableName();
return new TmpTableRef(query, tmpTable.ElementType, tmpQuery.Into.Name);
}
