public TableContext(ExpressionBuilder builder, BuildInfo buildInfo)
{
Builder = builder;
Parent = buildInfo.Parent;
Expression = buildInfo.Expression;
SelectQuery = buildInfo.SelectQuery;
var mc = (MethodCallExpression)Expression;
var attr = builder.GetTableFunctionAttribute(mc.Method);
if (!typeof(ITable <>).IsSameOrParentOf(mc.Method.ReturnType))
{
throw new LinqException("Table function has to return Table<T>.");
}
OriginalType = mc.Method.ReturnType.GetGenericArgumentsEx()[0];
ObjectType = GetObjectType();
SqlTable = new SqlTable(builder.MappingSchema, ObjectType);
EntityDescriptor = Builder.MappingSchema.GetEntityDescriptor(ObjectType);
SelectQuery.From.Table(SqlTable);
var args = mc.Arguments.Select(a => builder.ConvertToSql(this, a));
attr.SetTable(SqlTable, mc.Method, mc.Arguments, args);
Init();
}
static T Find <T>(ExpressionBuilder builder, BuildInfo buildInfo, Func <int, IBuildContext, T> action)
{
var expression = buildInfo.Expression;
switch (expression.NodeType)
{
case ExpressionType.Constant:
{
var c = (ConstantExpression)expression;
if (c.Value is IQueryable)
{
return(action(1, null));
}
break;
}
case ExpressionType.Call:
{
var mc = (MethodCallExpression)expression;
if (mc.Method.Name == "GetTable")
{
if (typeof(ITable <>).IsSameOrParentOf(expression.Type))
{
return(action(2, null));
}
}
var attr = builder.GetTableFunctionAttribute(mc.Method);
if (attr != null)
{
return(action(5, null));
}
break;
}
case ExpressionType.MemberAccess:
if (typeof(ITable <>).IsSameOrParentOf(expression.Type))
{
return(action(3, null));
}
// Looking for association.
//
if (buildInfo.IsSubQuery && buildInfo.SelectQuery.From.Tables.Count == 0)
{
var ctx = builder.GetContext(buildInfo.Parent, expression);
if (ctx != null)
{
return(action(4, ctx));
}
}
break;
case ExpressionType.Parameter:
{
if (buildInfo.IsSubQuery && buildInfo.SelectQuery.From.Tables.Count == 0)
{
var ctx = builder.GetContext(buildInfo.Parent, expression);
if (ctx != null)
{
return(action(4, ctx));
}
}
break;
}
}
return(action(0, null));
}
static BuildContextType FindBuildContext(ExpressionBuilder builder, BuildInfo buildInfo, out IBuildContext?parentContext)
{
parentContext = null;
var expression = buildInfo.Expression;
switch (expression.NodeType)
{
case ExpressionType.Constant:
{
var c = (ConstantExpression)expression;
if (c.Value is IQueryable queryable)
{
if (typeof(CteTable <>).IsSameOrParentOf(c.Value.GetType()))
{
return(BuildContextType.CteConstant);
}
// Avoid collision with ArrayBuilder
var elementType = queryable.ElementType;
if (builder.MappingSchema.IsScalarType(elementType) && typeof(EnumerableQuery <>).IsSameOrParentOf(c.Value.GetType()))
{
break;
}
if (queryable.Expression.NodeType == ExpressionType.NewArrayInit)
{
break;
}
return(BuildContextType.TableConstant);
}
break;
}
case ExpressionType.Call:
{
var mc = (MethodCallExpression)expression;
switch (mc.Method.Name)
{
case "GetTable":
{
if (typeof(ITable <>).IsSameOrParentOf(expression.Type))
{
return(BuildContextType.GetTableMethod);
}
break;
}
case "AsCte":
return(BuildContextType.AsCteMethod);
case "FromSql":
return(BuildContextType.FromSqlMethod);
case "FromSqlScalar":
return(BuildContextType.FromSqlScalarMethod);
}
var attr = builder.GetTableFunctionAttribute(mc.Method);
if (attr != null)
{
return(BuildContextType.TableFunctionAttribute);
}
if (mc.IsAssociation(builder.MappingSchema))
{
parentContext = builder.GetContext(buildInfo.Parent, expression);
if (parentContext != null)
{
return(BuildContextType.Association);
}
}
break;
}
case ExpressionType.MemberAccess:
if (typeof(ITable <>).IsSameOrParentOf(expression.Type))
{
return(BuildContextType.MemberAccess);
}
// Looking for association.
//
if (buildInfo.IsSubQuery /* && buildInfo.SelectQuery.From.Tables.Count == 0*/)
{
parentContext = builder.GetContext(buildInfo.Parent, expression);
if (parentContext != null)
{
return(BuildContextType.Association);
}
}
break;
case ExpressionType.Parameter:
{
if (buildInfo.IsSubQuery && buildInfo.SelectQuery.From.Tables.Count == 0)
{
// It should be handled by GroupByElementBuilder
//
if (typeof(IGrouping <,>).IsSameOrParentOf(expression.Type))
{
break;
}
parentContext = builder.GetContext(buildInfo.Parent, expression);
if (parentContext != null)
{
return(BuildContextType.Association);
}
}
break;
}
}
return(BuildContextType.None);
}
static BuildContextType FindBuildContext(ExpressionBuilder builder, BuildInfo buildInfo, out IBuildContext parentContext)
{
parentContext = null;
var expression = buildInfo.Expression;
switch (expression.NodeType)
{
case ExpressionType.Constant:
{
var c = (ConstantExpression)expression;
if (c.Value is IQueryable)
{
if (typeof(CteTable <>).IsSameOrParentOf(c.Value.GetType()))
{
return(BuildContextType.CteConstant);
}
return(BuildContextType.TableConstant);
}
break;
}
case ExpressionType.Call:
{
var mc = (MethodCallExpression)expression;
switch (mc.Method.Name)
{
case "GetTable":
if (typeof(ITable <>).IsSameOrParentOf(expression.Type))
{
return(BuildContextType.GetTableMethod);
}
break;
case "AsCte":
return(BuildContextType.AsCteMethod);
}
var attr = builder.GetTableFunctionAttribute(mc.Method);
if (attr != null)
{
return(BuildContextType.TableFunctionAttribute);
}
if (mc.IsAssociation(builder.MappingSchema))
{
parentContext = builder.GetContext(buildInfo.Parent, expression);
if (parentContext != null)
{
return(BuildContextType.Association);
}
}
break;
}
case ExpressionType.MemberAccess:
if (typeof(ITable <>).IsSameOrParentOf(expression.Type))
{
return(BuildContextType.MemberAccess);
}
// Looking for association.
//
if (buildInfo.IsSubQuery && buildInfo.SelectQuery.From.Tables.Count == 0)
{
parentContext = builder.GetContext(buildInfo.Parent, expression);
if (parentContext != null)
{
return(BuildContextType.Association);
}
}
break;
case ExpressionType.Parameter:
{
if (buildInfo.IsSubQuery && buildInfo.SelectQuery.From.Tables.Count == 0)
{
parentContext = builder.GetContext(buildInfo.Parent, expression);
if (parentContext != null)
{
return(BuildContextType.Association);
}
}
break;
}
}
return(BuildContextType.None);
}
