/// <summary>
/// <![CDATA[
/// 将聚合子表达式解析为嵌入式子查询条件。
/// 例如：
/// 将表达式
/// book.ChapterList.Cast<Chapter>().Any(c => c.Name == chapterName)
/// 转换为：
/// f.Exists(f.Query(chapter,
/// where: f.And(
/// f.Constraint(chapter.Column(Chapter.BookIdProperty), book.IdColumn),
/// f.Constraint(chapter.Column(Chapter.NameProperty), chapterName)
/// )
/// ))
/// SQL：
/// SELECT * FROM [Book] b
/// WHERE EXISTS(
/// SELECT * FROM [Chapter] c
/// WHERE c.BookId = b.Id AND
/// c.Name = {0}
/// )
/// ]]>
/// </summary>
/// <param name="exp">需要解析的表达式</param>
/// <param name="parentQuery"></param>
/// <param name="propertyFinder">The property finder.</param>
internal IConstraint Build(Expression exp, IQuery parentQuery, PropertyFinder propertyFinder)
{
_parentQuery = parentQuery;
_parentPropertyFinder = propertyFinder;
this.Visit(exp);
var res = f.Exists(_query);
if (!_isAny)
{
res = f.Not(res);
}
//如果父查询中需要反转条件，则返回 NOT 语句。
if (propertyFinder.ReverseConstraint)
{
res = f.Not(res);
}
//把可空外键的不可空条件，与 Exists 条件合并后返回。
if (propertyFinder.NullableRefConstraint != null)
{
var op = propertyFinder.ReverseConstraint ? BinaryOperator.Or : BinaryOperator.And;
res = f.Binary(propertyFinder.NullableRefConstraint, op, res);
}
return(res);
}
/// <summary>
/// <![CDATA[
/// 将聚合子表达式解析为嵌入式子查询条件。
/// 例如：
/// 将表达式
/// book.ChapterList.Cast<Chapter>().Any(c => c.Name == chapterName)
/// 转换为：
/// f.Exists(f.Query(chapter,
/// where: f.And(
/// f.Constraint(chapter.Column(Chapter.BookIdProperty), book.IdColumn),
/// f.Constraint(chapter.Column(Chapter.NameProperty), chapterName)
/// )
/// ))
/// SQL：
/// SELECT * FROM [Book] b
/// WHERE EXISTS(
/// SELECT * FROM [Chapter] c
/// WHERE c.BookId = b.Id AND
/// c.Name = {0}
/// )
/// ]]>
/// </summary>
/// <param name="exp">需要解析的表达式</param>
/// <param name="parentQuery"></param>
/// <param name="propertyFinder">The property finder.</param>
internal IConstraint Build(Expression exp, IQuery parentQuery, PropertyFinder propertyFinder)
{
_parentQuery = parentQuery;
_parentPropertyFinder = propertyFinder;
this.Visit(exp);
var res = f.Exists(_query);
if (!_isAny) res = f.Not(res);
//如果父查询中需要反转条件，则返回 NOT 语句。
if (propertyFinder.ReverseConstraint)
{
res = f.Not(res);
}
//把可空外键的不可空条件，与 Exists 条件合并后返回。
if (propertyFinder.NullableRefConstraint != null)
{
var op = propertyFinder.ReverseConstraint ? BinaryOperator.Or : BinaryOperator.And;
res = f.Binary(propertyFinder.NullableRefConstraint, op, res);
}
return res;
}
