How does Net Core perform a multi conditional query against MongoDB
- 2021-11-13 07:09:37
- OfStack
MySQL database was basically used in previous projects. Recently, leader decided to migrate the log module to MongoDB with better insert/query performance. The writing method of multi-condition query really took some effort, and wrote a record.
1. Preparations
1. The installation process is not repeated
2. Add ReferencePackage
dotnet add package mongodb.bson
dotnet add package mongodb.driver
3. appsetting. json Add Connection Configuration
"MongodbHost": {
"Connection": "mongodb://[username]:[password]@[ip]:[port]",
"DataBase": "[database]",
"Table": ""
},
4. Method to get MongoDBConfig
public static MongodbHostOptions MongodbConfig()
{
var builder = new ConfigurationBuilder()
.SetBasePath(Directory.GetCurrentDirectory())
.AddJsonFile("appsettings.json");
IConfiguration Configuration = builder.Build();
var option = Configuration.GetSection("MongodbHost");
return new MongodbHostOptions { Connection = option["Connection"], DataBase = option["DataBase"], Table = option["Table"] };
}
2. Query method
The query method here is found online, directly used. If it is a single 1 data source, here host can be extracted into helper class attributes.
#region FindListByPage Paged query set
/// <summary>
/// Paged query set
/// </summary>
/// <param name="filter"> Query criteria </param>
/// <param name="pageIndex"> Current page </param>
/// <param name="pageSize"> Page capacity </param>
/// <param name="count"> Total number of articles </param>
/// <param name="field"> Fields to query , Query all when not writing </param>
/// <param name="sort"> Fields to sort </param>
/// <returns></returns>
public static List<T> FindListByPage(FilterDefinition<T> filter, int pageIndex, int pageSize, out int count, string[] field = null, SortDefinition<T> sort = null)
{
try
{
MongodbHostOptions host = Tools.AppSettingsTools.MongodbConfig();
host.Table = "WSMessageLog";
var client = MongodbClient<T>.MongodbInfoClient(host);
count = Convert.ToInt32(client.CountDocuments(filter));
// Do not specify query fields
if (field == null || field.Length == 0)
{
if (sort == null) return client.Find(filter).Skip((pageIndex - 1) * pageSize).Limit(pageSize).ToList();
// Sort
return client.Find(filter).Sort(sort).Skip((pageIndex - 1) * pageSize).Limit(pageSize).ToList();
}
// Specify query fields
var fieldList = new List<ProjectionDefinition<T>>();
for (int i = 0; i < field.Length; i++)
{
fieldList.Add(Builders<T>.Projection.Include(field[i].ToString()));
}
var projection = Builders<T>.Projection.Combine(fieldList);
fieldList?.Clear();
// Do not sort
if (sort == null) return client.Find(filter).Project<T>(projection).Skip((pageIndex - 1) * pageSize).Limit(pageSize).ToList();
// Sort query
return client.Find(filter).Sort(sort).Project<T>(projection).Skip((pageIndex - 1) * pageSize).Limit(pageSize).ToList();
}
catch (Exception ex)
{
throw ex;
}
}
#endregion
3. Call the query method
There is also a pit. The time stored in MongoDB is Greenwich Mean Time. Insert 8:00, and you will find that it becomes 0:00 when querying, so you need to add a label when defining the time attribute
[BsonDateTimeOptions(Kind = DateTimeKind.Local)]
public DateTime logtime { get; set; }
Here, OprLogModel is a class that defines query conditions.
public static LogPager<log_operate> Get_operate_log_mongo(OprLogModel qModel)
{
LogPager<log_operate> pager = new LogPager<log_operate>();
FilterDefinition<log_operate> filters;
var sortbuilder = Builders<log_operate>.Sort;
var sort = sortbuilder.Descending("operate_time");
#region User rights filtering
IEnumerable<string> IdList = dev_deviceRepository.GetBinding(qModel.user_id);
filters = Builders<log_operate>.Filter.In("device_id", IdList);
#endregion
if (!string.IsNullOrEmpty(qModel.device_id))
{
var filters_did = Builders<log_operate>.Filter.Eq("device_id", qModel.device_id);
filters = Builders<log_operate>.Filter.And(filters, filters_did);
}
if (qModel.sDate != null)
{
var filters_sdate = Builders<log_operate>.Filter.Gte<DateTime>("operate_time", Convert.ToDateTime(qModel.sDate));
filters = Builders<log_operate>.Filter.And(filters, filters_sdate);
}
if (qModel.eDate != null)
{
var filters_edate = Builders<log_operate>.Filter.Lte<DateTime>("operate_time", Convert.ToDateTime(qModel.eDate));
filters = Builders<log_operate>.Filter.And(filters, filters_edate);
}
int total;
pager.data = MongoTools<log_operate>.FindListByPage(filters, qModel.pageindex, (qModel.pageindex - 1) * qModel.pagesize, out total, null, sort);
pager.total = total;
return pager;
}
#endregion
You can also define an empty filterdefinition first, and then aggregate it with each query condition through And:
FilterDefinition<log_operate> filters = FilterDefinition<log_operate>.Empty;
var filters_idlist = Builders<log_operate>.Filter.In("device_id", IdList);
filters = Builders<log_operate>.Filter.And(filters, filters_idlist);
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