.Net Core对MongoDB执行多条件查询

以前项目基本上全部使用mysql数据库, 最近项目排期空出了一点时间leader决定把日志模块迁移到插入/查询性能更好的mongodb上. 多条件查询的写法着实费了些功夫, 撰文记录一下.

一、准备工作

1. 安装过程, 不赘述了

2. 添加referencepackage

dotnet add package mongodb.bson
dotnet add package mongodb.driver

3. appsetting.json添加连接配置

"mongodbhost": {
    "connection": "mongodb://[username]:[password]@[ip]:[port]",
    "database": "[database]",
    "table": ""
  },

4. 获取mongodbconfig 的方法

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"] };
}

 

二、查询方法

这里的查询方法是网上找的, 直接拿来用了. 如果是单一数据源的话, 这里的host可以提取出来成为helper类的属性.

 1 #region findlistbypage 分页查询集合
 2     /// <summary>
 3     /// 分页查询集合
 4     /// </summary>
 5     /// <param name="filter">查询条件</param>
 6     /// <param name="pageindex">当前页</param>
 7     /// <param name="pagesize">页容量</param>
 8     /// <param name="count">总条数</param>
 9     /// <param name="field">要查询的字段,不写时查询全部</param>
10     /// <param name="sort">要排序的字段</param>
11     /// <returns></returns>
12     public static list<t> findlistbypage(filterdefinition<t> filter, int pageindex, int pagesize, out int count, string[] field = null, sortdefinition<t> sort = null)
13     {
14         try
15         {
16             mongodbhostoptions host = tools.appsettingstools.mongodbconfig();
17             host.table = "wsmessagelog";
18             var client = mongodbclient<t>.mongodbinfoclient(host);
19             count = convert.toint32(client.countdocuments(filter));
20             //不指定查询字段
21             if (field == null || field.length == 0)
22             {
23                 if (sort == null) return client.find(filter).skip((pageindex - 1) * pagesize).limit(pagesize).tolist();
24                 //进行排序
25                 return client.find(filter).sort(sort).skip((pageindex - 1) * pagesize).limit(pagesize).tolist();
26             }
27 
28             //指定查询字段
29             var fieldlist = new list<projectiondefinition<t>>();
30             for (int i = 0; i < field.length; i++)
31             {
32                 fieldlist.add(builders<t>.projection.include(field[i].tostring()));
33             }
34             var projection = builders<t>.projection.combine(fieldlist);
35             fieldlist?.clear();
36 
37             //不排序
38             if (sort == null) return client.find(filter).project<t>(projection).skip((pageindex - 1) * pagesize).limit(pagesize).tolist();
39 
40             //排序查询
41             return client.find(filter).sort(sort).project<t>(projection).skip((pageindex - 1) * pagesize).limit(pagesize).tolist();
42 
43         }
44         catch (exception ex)
45 　　{
46 　　　　throw ex;
47 　　}
48 }
49 #endregion

 

三、调用查询方法

这里还踩了一个坑. mongodb里存储的时间是格林尼治时间, 插入8:00, 查询时会发现变成了0:00,所以定义时间属性的时候需要加个标签

[bsondatetimeoptions(kind = datetimekind.local)]
public datetime logtime { get; set; }

   这里的oprlogmodel是定义了查询条件的类.

 1 public static logpager<log_operate> get_operate_log_mongo(oprlogmodel qmodel)
 2 {
 3 　　logpager<log_operate> pager = new logpager<log_operate>();
 4 　　filterdefinition<log_operate> filters;
 5 
 6　　 var sortbuilder = builders<log_operate>.sort;
 7 　　var sort = sortbuilder.descending("operate_time");
 8 
 9 　　#region 用户权限过滤
10 　　ienumerable<string> idlist = dev_devicerepository.getbinding(qmodel.user_id);
11　　 filters = builders<log_operate>.filter.in("device_id", idlist);
12 　　#endregion
13 
14 　　if (!string.isnullorempty(qmodel.device_id))
15    {
16    　　var filters_did = builders<log_operate>.filter.eq("device_id", qmodel.device_id);
17    　　filters = builders<log_operate>.filter.and(filters, filters_did);
18 　　}
19 　　if (qmodel.sdate != null)
20 　　{
21 　　　　var filters_sdate = builders<log_operate>.filter.gte<datetime>("operate_time", convert.todatetime(qmodel.sdate));
22 　　　　filters = builders<log_operate>.filter.and(filters, filters_sdate);
23 　　}
24 　　if (qmodel.edate != null)
25 　　{
26 　　　　var filters_edate = builders<log_operate>.filter.lte<datetime>("operate_time", convert.todatetime(qmodel.edate));
27 　　　　filters = builders<log_operate>.filter.and(filters, filters_edate);
28 　　} 
29 　　int total;
30 　　pager.data = mongotools<log_operate>.findlistbypage(filters, qmodel.pageindex, (qmodel.pageindex - 1) * qmodel.pagesize, out total, null, sort);
31 　　pager.total = total;
32 　　return pager;
33 }
34 #endregion

也可以先定义一个空的filterdefinition, 然后与各查询条件通过and聚合:

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);