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Update mongodb

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This commit is contained in:
sunkaixuan
2025-05-02 15:25:47 +08:00
parent 52f20ee74c
commit 5d6dc94b50
2 changed files with 34 additions and 25 deletions
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31
Src/Asp.NetCore2/MongoDb.Ado.data/ExecuteScalarItems/ExecuteScalarHandler.cs Normal file
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@@ -0,0 +1,31 @@
using MongoDB.Bson;
using MongoDB.Driver;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace MongoDb.Ado.data
{
public class ExecuteScalarHandler
{
public object Handle(IMongoCollection<BsonDocument> collection, string json)
{
var filter = string.IsNullOrWhiteSpace(json) ? FilterDefinition<BsonDocument>.Empty : BsonDocument.Parse(json);
// 设置投影排除 "_id" 字段，确保返回的结果不包含 _id 字段
var projection = Builders<BsonDocument>.Projection.Exclude("_id");
// 执行查询并限制返回一条记录
var document = collection.Find(filter).Project(projection).FirstOrDefault();
// 如果查询到结果且文档非空，则获取第一个字段的值
if (document != null && document.Elements.Any())
{
var firstElement = document.Elements.First(); // 获取第一个字段（列）
return firstElement.Value; // 返回该字段的值
}
return null; //
}
}
}

28
Src/Asp.NetCore2/MongoDb.Ado.data/MongoDbCommand.cs
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@@ -68,33 +68,11 @@ namespace MongoDb.Ado.data
}
public override object ExecuteScalar()
{
var (operation, collectionName, json) = ParseCommand(_commandText);
{
var (operation, collectionName, json) = ParseCommand(_commandText);
var collection = GetCollection(collectionName);
if (operation == "find")
{
var filter = string.IsNullOrWhiteSpace(json) ? FilterDefinition<BsonDocument>.Empty : BsonDocument.Parse(json);
// 设置投影排除 "_id" 字段，确保返回的结果不包含 _id 字段
var projection = Builders<BsonDocument>.Projection.Exclude("_id");
// 执行查询并限制返回一条记录
var document = collection.Find(filter).Project(projection).FirstOrDefault();
// 如果查询到结果且文档非空，则获取第一个字段的值
if (document != null && document.Elements.Any())
{
var firstElement = document.Elements.First(); // 获取第一个字段（列）
return firstElement.Value; // 返回该字段的值
}
return null; // 如果没有结果或没有字段，返回 null
}
return null;
return new ExecuteScalarHandler().Handle(collection, json);
}
protected override DbDataReader ExecuteDbDataReader(CommandBehavior behavior)
{
var (operation, collectionName, json) = ParseCommand(_commandText);