public JoinBlock(QueryBlock query, JoinType joinType, TableRef innerRef, StatementBlock on)
{
this.query = query;
JoinType = joinType;
InnerRef = innerRef;
On = on;
}
public void ApplyJoin(JoinType joinType, TableRef inner, LambdaExpression outerKeySelector, LambdaExpression innerKeySelector, LambdaExpression membersSelector)
{
var left = new StatementBlock(query.QueryBatch, outerKeySelector.Body, new QueryMapWithLambdaParam(query.QueryMap, outerKeySelector.Parameters[0]));
var right = new StatementBlock(query.QueryBatch, innerKeySelector.Body, new QueryMapWithLambdaParam(inner.QueryMap, innerKeySelector.Parameters[0]));
Joins.Add(new JoinBlock(query, joinType, inner, new StatementBlock($"{left} = {right}")));
var p1 = new QueryMapWithLambdaParam(query.QueryMap, membersSelector.Parameters[0]);
var p2 = new QueryMapWithLambdaParam(inner.QueryMap, membersSelector.Parameters[1]);
query.QueryMap = new MapTransformer(p1, p2).Transform(membersSelector.Body);
}
public void Inspect(Expression innerExpression, LambdaExpression key, LambdaExpression next)
{
topQuery = new QueryBlock(query.QueryBatch, query, innerExpression);
topQuery.QueryMap.Add(new ColumnMap(new TypeMemberPath(lvl), new StatementBlock("1")));
bottomQuery = new QueryBlock(null, query, null);
bottomQuery.From.MainTable = new DummyRef(query, "cte");
var baseQuery = TableRef.Create(bottomQuery, innerExpression);
var resultType = typeof(RecursionEntry<>).MakeGenericType(baseQuery.ResultType);
bottomQuery.QueryMap = new QueryMap(resultType, bottomQuery.From.MainTable.Alias);
//bottomQuery.QueryMap.Add(new ColumnMap(new TypeMemberPath(lvl), new StatementBlock($"[{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");
}
/// <summary>
/// select h.*, lvl + 1 as lvl
/// from cte as c
/// inner join Hierarchy h on h.parentId = c.Id
/// </summary>
private void CreateJoinExpressionToCte(TableRef baseQuery, LambdaExpression key, LambdaExpression next)
{
var resultType = typeof(RecursionEntry<>).MakeGenericType(baseQuery.ResultType);
var outter_p = Expression.Parameter(resultType);
var inner_p = Expression.Parameter(baseQuery.ResultType);
var cteInit = Expression.Bind(resultType.GetMember(CtePropertyName)[0], inner_p);
var lvlPlusOne = Expression.Add(Expression.MakeMemberAccess(outter_p, resultType.GetMember(LevelPropertyName)[0]), Expression.Constant(1));
var lvlInit = Expression.Bind(resultType.GetMember(LevelPropertyName)[0], lvlPlusOne);
var memberInit = Expression.MemberInit(Expression.New(resultType), cteInit, lvlInit);
bottomQuery.From.ApplyJoin(JoinType.Inner, baseQuery, ChangeToCteMemberAccess(resultType, next), key, Expression.Lambda(memberInit, outter_p, inner_p));
}
internal void CopyFrom(TableRef inner)
{
throw new NotImplementedException();
}
