pvWay.MsSqlLoggerService.Core 1.0.2

MsSQLLoggerService for .Net Core

This service implements the ILoggerService from the MethodResultWrapper nuGet package using an Ms Sql database table as persistence layer

Pre-conditions for this service to work property

The connection string provided should allow inserting rows into a table that should conform to the following DDL.

Log table definition example

    CREATE TABLE [dbo].[ApplicationLog] (

	    [Id]			INT			IDENTITY(1,1) NOT NULL,
	    [UserId]		VARCHAR(36) NULL,
        [CompanyId]		VARCHAR(36) NULL, 
	    [SeverityCode]	CHAR(1) NOT NULL, -- [D]Debug... [F] Fatal (see SeverityEnum)
	    [MachineName]	VARCHAR(50) NOT NULL, -- Environment.MachineName
	    [Topic]			VARCHAR(50) NULL, -- enables to group log items for a given Topic
	    [Context]		VARCHAR(256) NOT NULL, -- membername, filepath, line number...
	    [Message]		NVARCHAR(MAX) NOT NULL, -- the message
	    [CreateDateUtc] DATETIME NOT NULL, -- timestamp in universal central time

	    CONSTRAINT [PK_Log] 
		    PRIMARY KEY CLUSTERED ([Id] DESC)
    );


    GO
    CREATE NONCLUSTERED INDEX [IX_TOPIC]
	    ON [dbo].[ApplicationLog] ([Topic] ASC)
        WHERE [Topic] IS NOT NULL;
    

Columns

Id

The Id column is not required and will not be populted by the service. However it might be convenient to have a primary column sorted DESC so that the last logs will be at the top of a select statement by default.

If you define this column make sure the database will fill it accordingly by for example using the IDENTITY keyword

UserId

• You can provide your own column name for this column
• The UserId column persists the identification of the connected user if any
• This column should be nullable
• This column should be of type varchar
• The logger will truncate any info exceding the max column length

CompanyId

• You can provide your own column name for this column
• The CompanyId column persists the identification of the company of the connected user if any
• This column should be nullable
• This column should be of type varchar
• The logger will truncate any info exceding the max column length

SeverityCode

• You can provide your own column name for this column
• The SeverityCode column persists the MethodResultWrapper.SeverityEnum code
• This column should be non nullable
• This column should be of type char (one char is enough)

   // Sevirity enum and corresponding codes
   // -------------------------------------
   public enum SeverityEnum
    {
        Ok, // "O"
        Debug, // "D"
        Info, // "I"
        Warning, // "W"
        Error, // "E"
        Fatal, // "F"
    }

MachineName

This column is certainly usefull in web farms

• You can provide your own column name for this column
• The MachineName column persists Environment.MachineName
• This column should be non nullable
• This column should be of type varchar
• The logger will truncate any info exceding the max column length

Topic

This column lets you group logs for a given topic

• You can provide your own column name for this column
• This column should be nullable
• This column should be of type varchar
• The logger will truncate any info exceding the max column length

Context

Where does it happened

• You can provide your own column name for this column
• The Context column persists method name, filepath and code line number.
• This column should be non nullable.
• This column should be of type varchar
• The logger will truncate any info exceding the max column length

Message

What happened

• You can provide your own column name for this column
• The Message column persists the message info
• This column should be non nullable.
• This column should be of type nvarchar(MAX)

CreateDateUtc

When does it happened

• You can provide your own column name for this column
• The Message column persists the UTC date.
• This column should be non nullable.
• This column should be of type datetime

Usage

using System;
using pvWay.MethodResultWrapper;
using pvWay.MsSqlLoggerService;

namespace MsSqlLoggerServiceLab
{
    internal static class Program
    {
        private static void Main(/*string[] args*/)
        {
            const string cs = "data source=Localhost;initial catalog=iota_PRD_20200208;" +
                              "integrated security=True;MultipleActiveResultSets=True;";

            var ls = new Logger(
                cs,
                SeverityEnum.Debug,
                "dbo",
                "Log",
                "UserId",
                "CompanyId",
                "MachineName",
                "SeverityCode",
                "Context",
                "Topic",
                "Message",
                "CreateDateUtc");

            ls.Log(new Exception());

            Console.WriteLine("hit enter to quit");
            Console.ReadLine();
        }
    }
}