Posts on Claudio Bosticco

SQL Server Reset Table Index

Fri, 01 Nov 2024 12:08:35 +0100

In case a table has an auto-incremental ID column, it may sometimes be appropriate to reset its base value (for example, after a truncate table).

DBCC CHECKIDENT ('tableName', RESEED, 1)

SQL Server Count All Rows in All Tables

Fri, 01 Nov 2024 12:08:10 +0100

This query is used to count all rows in all tables of a database.

CREATE TABLE #counts
(
 table_name varchar(255),
 row_count int
)

EXEC sp_MSForEachTable @command1='INSERT #counts (table_name, row_count) SELECT ''?'', COUNT(*) FROM ?'
SELECT table_name, row_count FROM #counts ORDER BY row_count DESC
DROP TABLE #counts

SQL Server Backup Database via Query

Fri, 01 Nov 2024 12:06:50 +0100

To backup a SQL Server database using a SQL query, you need to use the following command:

BACKUP DATABASE DatabaseName TO DISK ='C:\DBSQLBACKUP\DatabaseName.bak'

Linux Disk Space Maintenance

Fri, 01 Nov 2024 12:06:08 +0100

This section illustrates commands for optimizing space on Linux servers.

Delete files with a certain extension

You can use the find command specifying:

directory to search (recursively)
the -name tag to filter by extension
the -delete tag to launch deletion of found files

find /var/opt/docker -name *.bak -delete

Find files larger than 1GB

You can use the find command specifying:

directory to search (recursively)
the -name tag to filter by extension
the -size tag to filter only files with size equal to or greater than 1 GB
the -printf tag to print filename and size in KB

find /var/opt/docker -name '*.ldf' -size +1G -printf "%p %k KB\n"

EF Migrations

Fri, 01 Nov 2024 12:05:12 +0100

This section illustrates useful commands for managing migrations.

Adding a migration

To add a migration, navigate to the folder where the solution file is located and use the following command:


dotnet ef migrations add <<MigrationName>> --context LogicWayContext -p LogicWay.Core -s LogicWay

It is important to specify the -p flag to indicate the project where the context is located and where to create the migration file, and also the -s flag to specify the solution, from which the command can determine which startup project contains the database connection string.

JavaScript Filter Map Reduce

Fri, 01 Nov 2024 12:03:32 +0100

These three functions are used to quickly manage data within lists. They are the JavaScript equivalent of LINQ.

Filter

The filter function allows you to extract certain elements from the array based on a function.

const numbers = [1, 4, 5, 6, 4, 2, 5, 6, 3, 1];
const even = numbers.filter((x) => x % 2 === 0);
console.log("Even numbers: ", even);

Map

The map function allows you to apply a function to each element of the list.

const numbers = [1, 4, 5, 6, 4, 2, 5, 6, 3, 1];
const squares = numbers.map((x) => x * x);
console.log("Squares: ", squares);

Reduce

The reduce function allows you to perform a function on each element of the list and returns an “accumulated” result.

7zip Guide

Fri, 01 Nov 2024 12:03:03 +0100

7-Zip can be used via console. To simplify its use, simply add the path to the executable to the system PATH.

Extract files

7z.exe e sourcefile.zip

Prevent Double Click Button ASP WebForms

Fri, 01 Nov 2024 11:59:00 +0100

To prevent inadvertent double-clicking of a Button in an ASP.NET WebForms project, you need to set the UseSubmitBehavior="false" tag:


<asp:Button runat="server" OnClick="Execute_Click" Text="Execute"
UseSubmitBehavior="false" OnClientClick="CheckDouble(this)"/>

and invoke the following JavaScript:

var submit = 0;
function CheckDouble(bt) {
 //alert(submit);
 if (submit > 0) {
 bt.disabled = true;
 alert(
 "You have already clicked the button. Wait for the operation to complete"
 );
 return false;
 }
 submit++;
 return true;
}