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Update mongodb

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This commit is contained in:
sunkaixuan
2025-06-29 14:26:00 +08:00
parent b060b98f33
commit 4a4cbcfea5
2 changed files with 57 additions and 22 deletions
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14
Src/Asp.NetCore2/MongoDbTest/UnitTest/QueryLeftJoin2.cs
View File

@@ -58,6 +58,20 @@ namespace MongoDbTest
.LeftJoin<School>((s, sc) => s.SchoolId == sc.Id)
.Select((s, sc) => s).ToList();
if (dt3.First().Name != "张三") Cases.ThrowUnitError();
var dt5 = db.Queryable<Student>()
.LeftJoin<School>((s, sc) => s.SchoolId == sc.Id )
.Select((s, sc) => new {
studentName = s.Name,
schoolName = sc.Name
}).ToList();
var dt4 = db.Queryable<Student>()
.LeftJoin<School>((s, sc) => s.SchoolId.ToLower() == sc.Id.ToString())
.Select((s,sc)=>new {
studentName=s.Name,
schoolName=sc.Name
}).ToList();
if (dt3.First().Name != "张三") Cases.ThrowUnitError();
}
[SqlSugar.SugarTable("UnitStudentdu2s31")]
public class Student : MongoDbBase

65
Src/Asp.NetCore2/SqlSugar.MongoDbCore/MongoDb/SqlBuilder/MongoDbQueryBuilder.cs
View File

@@ -194,35 +194,34 @@ namespace SqlSugar.MongoDb
{
foreach (var item in this.JoinQueryInfos)
{
// 解析 JoinWhere JSON，假设格式为 { "SchoolId" : { "$eq" : "_id" } }
var joinWhereDoc = MongoDB.Bson.Serialization.BsonSerializer.Deserialize<BsonDocument>(item.JoinWhere);
// 只支持单字段等值连接
var localField = joinWhereDoc.GetElement(0).Name;
var eqObj = joinWhereDoc[localField].AsBsonDocument;
var foreignField = eqObj.GetElement(0).Value.AsString;
var isExp = joinWhereDoc.Contains("$expr");
var localField = isExp ? string.Empty : joinWhereDoc.GetElement(0).Name;
var eqObj = isExp ? null : joinWhereDoc[localField].AsBsonDocument;
var foreignField = isExp ? string.Empty : eqObj.GetElement(0).Value.AsString;
// from: 目标集合名（假设 JoinQueryInfo 有 TableName/ShortName 字段，需根据实际情况调整）
// as: 关联后的别名（假设 JoinQueryInfo 有 ShortName 字段）
string from = item.TableName ?? item.ShortName ?? "Unknown";
string asName = item.ShortName;
var asNamePrefix = $"{asName}.";
var isValueKey = foreignField.StartsWith(asNamePrefix) && !localField.StartsWith(asNamePrefix);
var isKeyValue = !foreignField.StartsWith(asNamePrefix) && localField.StartsWith(asNamePrefix);
var isValueKey = !isExp && foreignField.StartsWith(asNamePrefix) && !localField.StartsWith(asNamePrefix);
var isKeyValue = !isExp && !foreignField.StartsWith(asNamePrefix) && localField.StartsWith(asNamePrefix);
var isEasyJoin = isKeyValue || isValueKey;
if (isKeyValue)
{
localField = localField.TrimStart(asNamePrefix.toCharArray());
{
localField = localField.TrimStart(asNamePrefix.ToCharArray());
var oldLocalField = localField;
localField = foreignField;
foreignField = oldLocalField;
}
else if(isValueKey)
else if (isValueKey)
{
foreignField = foreignField.TrimStart(asNamePrefix.toCharArray());
foreignField = foreignField.TrimStart(asNamePrefix.ToCharArray());
}
if (isEasyJoin)
{
// $lookup
{
// $lookup 简单等值连接
var lookupDoc = new BsonDocument("$lookup", new BsonDocument
{
{ "from", from },
@@ -232,28 +231,50 @@ namespace SqlSugar.MongoDb
});
operations.Add(lookupDoc.ToJson(UtilMethods.GetJsonWriterSettings()));
}
else
{
// 解析$expr表达式
var exprDoc = joinWhereDoc.Contains("$expr") ? joinWhereDoc["$expr"] : joinWhereDoc;
// 构造let变量（可扩展，当前假设无变量）
var letDoc = new BsonDocument();
// 构造pipeline
var pipelineArray = new BsonArray
{
new BsonDocument("$match", new BsonDocument("$expr", exprDoc))
};
var lookupDoc = new BsonDocument("$lookup", new BsonDocument
{
{ "from", from },
{ "let", letDoc },
{ "pipeline", pipelineArray },
{ "as", asName }
});
operations.Add(lookupDoc.ToJson(UtilMethods.GetJsonWriterSettings()));
}
// $unwind
BsonValue unwindDoc = null;
if (item.JoinType == JoinType.Left)
{
unwindDoc=new BsonDocument("$unwind", new BsonDocument
unwindDoc = new BsonDocument("$unwind", new BsonDocument
{
{ "path", $"${asName}" },
{ "preserveNullAndEmptyArrays", true }
{ "path", $"${asName}" },
{ "preserveNullAndEmptyArrays", true }
});
}
else if(item.JoinType==JoinType.Inner)
else if (item.JoinType == JoinType.Inner)
{
// InnerJoin: 不保留空数组和null
unwindDoc = new BsonDocument("$unwind", new BsonDocument
{
{ "path", $"${asName}" }
});
}
else
else
{
throw new Exception(" No Support "+item.JoinType);
throw new Exception(" No Support " + item.JoinType);
}
operations.Add(unwindDoc.ToJson(UtilMethods.GetJsonWriterSettings()));
}