zoukankan      html  css  js  c++  java
  • Find Out What Your Entity Framework Query Is Really Doing

    Assuming that you're using Entity Framework 6, you already have a logging tool that can give you some insights into the SQL your queries are generating and the time they take to run. The Database property of your DbContext object has a Log property that will give you that information. To turn on logging, you just have to set the Log property to a method that will write to a log. This example sets up logging to write Entity Framework messages to to the Debug window:

    Dim db As SalesOrderEntities
    db = New SalesOrderEntities()
    db.Database.Log = AddressOf Debug.WriteLine

    In C#, you won't need the AddressOf keyword. You don't have to touch your code to make this change and you can also write your output to file by making some changes in your config file. To turn on logging to a file from your config file, just add a reference to the DatabaseLogger in the System.Data.Entity.Infrastructure.Interception namespace and point it to a file with XML, like this:

    <interceptors>
      <interceptor type=
        "System.Data.Entity.Infrastructure.Interception.DatabaseLogger, EntityFramework">
        <parameters>
          <parameter value="C:LogsMyApplication.txt"/>
        </parameters>
      </interceptor>
    </interceptors>

    Here's what the output looks like (slightly edited):

    Opened connection at 08-Nov-16 12:15:51 PM -05:00
    
    SELECT TOP (1) 
      [c].[Id] AS [Id], 
      [c].[FirstName] AS [FirstName], 
      [c].[LastName] AS [LastName], 
      [c].[CustCreditStatus] AS [CustCreditStatus], 
      [c].[CreditLimit] AS [CreditLimit], 
      [c].[RenewalDate] AS [RenewalDate], 
      [c].[Valid] AS [Valid]
      FROM [dbo].[Customers] AS [c]
    -- Executing at 08-Nov-16 12:15:51 PM -05:00
    -- Completed in 3 ms with result: SqlDataReader
    Closed connection at 08-Nov-16 12:15:51 PM -05:00
    

    when I used the First method on one of my tables.

  • 相关阅读:
    Grid自动添加行
    C#中Trim()、TrimStart()、TrimEnd()的用法
    input事件
    JS判断元素文本值是否为空
    JS转换Date日期格式
    Bootstrap 内联标签和徽章
    each()详解
    highcharts图表属性
    Highcharts去掉一些小图标
    div怎么在底部设计一个倒三角形
  • 原文地址:https://www.cnblogs.com/nele/p/6251606.html
Copyright © 2011-2022 走看看