EF获取多个数据集以及MySQL分页数据查询优化

 1 /// <summary>
 2 /// 获取分页数据以及总条数（EF获取多个数据集）
 3 /// </summary>
 4 /// <typeparam name="T">实体类</typeparam>
 5 /// <param name="sql">SQL语句（分页查询+SELECT FOUND_ROWS查询）</param>
 6 /// <param name="parameters">SQL参数</param>
 7 /// <param name="db">数据库上下文</param>
 8 /// <param name="queryData">返回数据</param>
 9 /// <param name="rowCount">总行数</param>
10 /// <param name="needReturnTotal">是否需要返回总行数</param>
11 public void GetQueryDataAndRowCount<T>(string sql, List<MySqlParameter> parameters, DbContext db, out List<T> queryData, out int rowCount, bool needReturnTotal = true)
12 {
13     var data = new List<T>();
14     var count = 0;
15     try
16     {
17         var cmd = db.Database.Connection.CreateCommand();
18         cmd.CommandText = sql;
19         if (parameters.Count > 0)
20         {
21             cmd.Parameters.AddRange(parameters.ToArray());
22         }
23         db.Database.Connection.Open();
24         var reader = cmd.ExecuteReader();
25         if (reader.HasRows)
26         {
27             data = ((IObjectContextAdapter)db).ObjectContext.Translate<T>(reader).ToList();
28             if (needReturnTotal)
29             {
30                 reader.NextResult();
31                 count = ((IObjectContextAdapter)db).ObjectContext.Translate<int>(reader).FirstOrDefault();
32             }
33         }
34     }
35     finally
36     {
37         db.Database.Connection.Close();
38     }
39     queryData = data;
40     rowCount = count;
41 }