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Improve query performance for invoice listing

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nicolas.dorier
2020-07-27 13:27:47 +09:00
parent 82582d24ea
commit ba316d02ca
2 changed files with 20 additions and 8 deletions
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17
BTCPayServer/Extensions.cs
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@@ -4,6 +4,7 @@ using System.Globalization;
using System.Linq;
using System.Net;
using System.Net.WebSockets;
using System.Reflection;
using System.Security.Claims;
using System.Text;
using System.Threading;
@@ -449,5 +450,21 @@ namespace BTCPayServer
};
return controller.View("PostRedirect", redirectVm);
}
public static string ToSql<TEntity>(this IQueryable<TEntity> query) where TEntity : class
{
var enumerator = query.Provider.Execute<IEnumerable<TEntity>>(query.Expression).GetEnumerator();
var relationalCommandCache = enumerator.Private("_relationalCommandCache");
var selectExpression = relationalCommandCache.Private<Microsoft.EntityFrameworkCore.Query.SqlExpressions.SelectExpression>("_selectExpression");
var factory = relationalCommandCache.Private<Microsoft.EntityFrameworkCore.Query.IQuerySqlGeneratorFactory>("_querySqlGeneratorFactory");
var sqlGenerator = factory.Create();
var command = sqlGenerator.GetCommand(selectExpression);
string sql = command.CommandText;
return sql;
}
private static object Private(this object obj, string privateField) => obj?.GetType().GetField(privateField, BindingFlags.Instance | BindingFlags.NonPublic)?.GetValue(obj);
private static T Private<T>(this object obj, string privateField) => (T)obj?.GetType().GetField(privateField, BindingFlags.Instance | BindingFlags.NonPublic)?.GetValue(obj);
}
}