static IBuildContext BuildCteContext(ExpressionBuilder builder, BuildInfo buildInfo)
{
var methodCall = (MethodCallExpression)buildInfo.Expression;
Expression bodyExpr;
IQueryable query = null;
string name = null;
bool isRecursive = false;
switch (methodCall.Arguments.Count)
{
case 1:
bodyExpr = methodCall.Arguments[0].Unwrap();
break;
case 2:
bodyExpr = methodCall.Arguments[0].Unwrap();
name = methodCall.Arguments[1].EvaluateExpression() as string;
break;
case 3:
query = methodCall.Arguments[0].EvaluateExpression() as IQueryable;
bodyExpr = methodCall.Arguments[1].Unwrap();
name = methodCall.Arguments[2].EvaluateExpression() as string;
isRecursive = true;
break;
default:
throw new InvalidOperationException();
}
builder.RegisterCte(query, bodyExpr, () => new CteClause(null, bodyExpr.Type.GetGenericArgumentsEx()[0], isRecursive, name));
var cte = builder.BuildCte(bodyExpr,
cteClause =>
{
var info = new BuildInfo(buildInfo, bodyExpr, new SelectQuery());
var sequence = builder.BuildSequence(info);
if (cteClause == null)
{
cteClause = new CteClause(sequence.SelectQuery, bodyExpr.Type.GetGenericArgumentsEx()[0], isRecursive, name);
}
else
{
cteClause.Body = sequence.SelectQuery;
cteClause.Name = name;
}
return(Tuple.Create(cteClause, sequence));
}
);
var cteBuildInfo = new BuildInfo(buildInfo, bodyExpr, buildInfo.SelectQuery);
var cteContext = new CteTableContext(builder, cteBuildInfo, cte.Item1, bodyExpr);
return(cteContext);
}
public CteTableContext(ExpressionBuilder builder, BuildInfo buildInfo, CteClause cte, Expression cteExpression)
: base(builder, buildInfo, new SqlCteTable(builder.MappingSchema, cte))
{
_cte = cte;
_cteExpression = cteExpression;
}
