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- 增加 变异的 IncludeMany，即使不是导航属性，也可以贪婪加载；

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This commit is contained in:
28810
2019-05-14 18:07:27 +08:00
parent 7238f6797b
commit defaa224fb
6 changed files with 96 additions and 11 deletions
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75
FreeSql/Internal/CommonProvider/SelectProvider/Select1Provider.cs
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@@ -316,10 +316,20 @@ namespace FreeSql.Internal.CommonProvider {
static MethodInfo GetEntityValueWithPropertyNameMethod = typeof(EntityUtilExtensions).GetMethod("GetEntityValueWithPropertyName");
static ConcurrentDictionary<Type, ConcurrentDictionary<string, MethodInfo>> _dicTypeMethod = new ConcurrentDictionary<Type, ConcurrentDictionary<string, MethodInfo>>();
public ISelect<T1> IncludeMany<TNavigate>(Expression<Func<T1, ICollection<TNavigate>>> navigateSelector, Action<ISelect<TNavigate>> then = null) where TNavigate : class {
public ISelect<T1> IncludeMany<TNavigate>(Expression<Func<T1, IEnumerable<TNavigate>>> navigateSelector, Action<ISelect<TNavigate>> then = null) where TNavigate : class {
var throwNavigateSelector = new Exception("IncludeMany 参数1 类型错误，表达式类型应该为 MemberAccess");
var expBody = navigateSelector?.Body;
if (expBody == null) return this;
if (expBody.NodeType != ExpressionType.MemberAccess) throw new Exception("IncludeMany 参数1 类型错误，表达式类型应该为 MemberAccess");
MethodCallExpression whereExp = null;
if (expBody.NodeType == ExpressionType.Call) {
throwNavigateSelector = new Exception($"IncludeMany {nameof(navigateSelector)} 参数类型错误，表达式格式应该是 a.collection.Where(c => c.aid == a.id)");
whereExp = (expBody as MethodCallExpression);
if (whereExp.Method.Name != "Where") throw throwNavigateSelector;
expBody = whereExp.Object ?? whereExp.Arguments.FirstOrDefault();
}
if (expBody.NodeType != ExpressionType.MemberAccess) throw throwNavigateSelector;
var collMem = expBody as MemberExpression;
Expression tmpExp = collMem.Expression;
var members = new Stack<MemberInfo>();
@@ -335,11 +345,67 @@ namespace FreeSql.Internal.CommonProvider {
isbreak = true;
break;
default:
throw new Exception("IncludeMany 参数1 类型错误");
throw throwNavigateSelector;
}
}
var tb = _commonUtils.GetTableByEntity(collMem.Expression.Type);
if (tb == null) throw new Exception("IncludeMany 参数1 类型错误");
if (tb == null) throw throwNavigateSelector;
var tbNav = _commonUtils.GetTableByEntity(typeof(TNavigate));
if (tbNav == null) throw new Exception($"类型 {typeof(TNavigate).FullName} 错误，不能使用 IncludeMany");
TableRef tbref = null;
if (whereExp == null) {
tbref = tb.GetTableRef(collMem.Member.Name, true);
} else {
//处理临时关系映射
tbref = new TableRef {
RefType = TableRefType.OneToMany,
Property = tb.Properties[collMem.Member.Name],
RefEntityType = tbNav.Type
};
foreach (var whereExpArg in whereExp.Arguments) {
if (whereExpArg.NodeType != ExpressionType.Lambda) continue;
var whereExpArgLamb = whereExpArg as LambdaExpression;
Action<Expression> actWeiParse = null;
actWeiParse = expOrg => {
var binaryExp = expOrg as BinaryExpression;
if (binaryExp == null) throw throwNavigateSelector;
switch (binaryExp.NodeType) {
case ExpressionType.AndAlso:
actWeiParse(binaryExp.Left);
actWeiParse(binaryExp.Right);
break;
case ExpressionType.Equal:
var leftP1MemberExp = binaryExp.Left as MemberExpression;
var rightP1MemberExp = binaryExp.Right as MemberExpression;
if (leftP1MemberExp == null || rightP1MemberExp == null) throw throwNavigateSelector;
if (leftP1MemberExp.Expression != tmpExp && leftP1MemberExp.Expression != whereExpArgLamb.Parameters[0] ||
rightP1MemberExp.Expression != tmpExp && rightP1MemberExp.Expression != whereExpArgLamb.Parameters[0]) throw throwNavigateSelector;
if (leftP1MemberExp.Expression == tmpExp && rightP1MemberExp.Expression == whereExpArgLamb.Parameters[0]) {
tbref.Columns.Add(tb.ColumnsByCs[leftP1MemberExp.Member.Name]);
tbref.RefColumns.Add(tbNav.ColumnsByCs[rightP1MemberExp.Member.Name]);
return;
}
if (rightP1MemberExp.Expression == tmpExp && leftP1MemberExp.Expression == whereExpArgLamb.Parameters[0]) {
tbref.Columns.Add(tb.ColumnsByCs[rightP1MemberExp.Member.Name]);
tbref.RefColumns.Add(tbNav.ColumnsByCs[leftP1MemberExp.Member.Name]);
return;
}
throw throwNavigateSelector;
default: throw throwNavigateSelector;
}
};
actWeiParse(whereExpArgLamb.Body);
break;
}
if (tbref.Columns.Any() == false) throw throwNavigateSelector;
}
if (collMem.Expression.NodeType != ExpressionType.Parameter)
_commonExpression.ExpressionWhereLambda(_tables, Expression.MakeMemberAccess(collMem.Expression, tb.Properties[tb.ColumnsByCs.First().Value.CsName]), null);
@@ -349,7 +415,6 @@ namespace FreeSql.Internal.CommonProvider {
if (list == null) return;
if (list.Any() == false) return;
var tbref = tb.GetTableRef(collMem.Member.Name, true);
if (tbref.Columns.Any() == false) return;
var t1parm = Expression.Parameter(typeof(T1));