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How to get list of all databases using MongodbClient class. (C# application)


How to get list of all databases using MongodbClient class. (C# application)

By : Lawrence H Cornelius
Date : November 28 2020, 04:01 AM
Any of those help I am using MongoDB driver, to communicate with Mongo database. I have a need where I need display all available databases. The library has only on method that says 'GetDatabase("dbname"). What is the way to get all dbs available in ny code. , Here is how you can get the list of dbs
code :
MongoClient client = new MongoClient("mongodb://localhost:27017");
List<string> dbs = new List<string>();
using (IAsyncCursor<BsonDocument> cursor = client.ListDatabases())
{
    while (cursor.MoveNext())
    {
        foreach (var doc in cursor.Current)
            dbs.Add((string)doc["name"]); // database name
    }
}


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In mysql, the show databases; command doesn't list all of my databases

In mysql, the show databases; command doesn't list all of my databases


By : Gala
Date : March 29 2020, 07:55 AM
it fixes the issue You're logging into HeidiSQL as root, so it's showing you all databases, but you're logging into mysql.exe as the current Windows user (since that's the default), so it's only showing you the databases that that user can see. If you run mysql.exe with --user=root --password=..., it will show you all databases.
SQL Server : Search for a string across all the databases and list all the databases, tables and corresponding columns

SQL Server : Search for a string across all the databases and list all the databases, tables and corresponding columns


By : Harish Raghav
Date : March 29 2020, 07:55 AM
help you fix your problem I am wondering if there is a way I can view all the databases and the corresponding tables where a specific string is present in SQL Server 2012. , You can use this stored procedure with value for search like this :
code :
exec SearchAllDatabases @SearchTerm = '%B2%'
  CREATE PROCEDURE dbo.SearchAllDatabases
  @SearchTerm NVARCHAR(255) = NULL
AS
BEGIN
  SET NOCOUNT ON;
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;

IF @SearchTerm IS NULL OR @SearchTerm NOT LIKE N'%[^%^_]%'
  BEGIN
    RAISERROR(N'Please enter a valid search term.', 11, 1);
RETURN;
  END

  CREATE TABLE #results
  (
    [database]   SYSNAME,
    [schema]     SYSNAME,
    [table]      SYSNAME,
    [column]     SYSNAME,
    ExampleValue NVARCHAR(1000)
  );

  DECLARE
    @DatabaseCommands  NVARCHAR(MAX) = N'', 
    @ColumnCommands NVARCHAR(MAX) = N'';

  SELECT @DatabaseCommands = @DatabaseCommands + N'
    EXEC ' + QUOTENAME(name) + '.sys.sp_executesql
        @ColumnCommands, N''@SearchTerm NVARCHAR(MAX)'', @SearchTerm;'
    FROM sys.databases
    WHERE database_id  > 4  -- non-system databases
      AND[state]      = 0-- online
      AND user_access  = 0; -- multi-user

    SET @ColumnCommands = N'DECLARE @q NCHAR(1),
          @SearchCommands NVARCHAR(MAX);

SELECT @q = NCHAR(39),
  @SearchCommands = N''DECLARE @VSearchTerm VARCHAR(255) = @SearchTerm;'';

    SELECT @SearchCommands = @SearchCommands + CHAR(10) + N''

      SELECT TOP(1)
        [db]     = DB_NAME(),
        [schema] = N'' + @q + s.name + @q + '', 
        [table]  = N'' + @q + t.name + @q + '',
        [column] = N'' + @q + c.name + @q + '',
        ExampleValue = LEFT('' + QUOTENAME(c.name) + '', 1000)
      FROM '' + QUOTENAME(s.name) + ''.'' + QUOTENAME(t.name) + ''
      WHERE '' + QUOTENAME(c.name) + N'' LIKE @'' + CASE
        WHEN c.system_type_id IN(35, 167, 175) THEN ''V'' 
        ELSE '''' END + ''SearchTerm;'' 

    FROM sys.schemas AS s
    INNER JOIN sys.tables AS t
    ON s.[schema_id] = t.[schema_id]
    INNER JOIN sys.columns AS c
    ON t.[object_id] = c.[object_id]
    WHERE c.system_type_id IN (35, 99, 167, 175, 231, 239)
      AND c.max_length >= LEN(@SearchTerm);

PRINT @SearchCommands;
EXEC sys.sp_executesql @SearchCommands,
  N''@SearchTerm NVARCHAR(255)'', @SearchTerm;';

  INSERT #Results
  (
    [database],
    [schema],
    [table],
    [column],
    ExampleValue
  )
  EXEC[master].sys.sp_executesql @DatabaseCommands,
   N'@ColumnCommands NVARCHAR(MAX), @SearchTerm NVARCHAR(255)', 
    @ColumnCommands, @SearchTerm;

  SELECT[Searched for] = @SearchTerm;

  SELECT[database],[schema],[table],[column],ExampleValue
FROM #Results 
    ORDER BY[database],[schema],[table],[column];
END
GO
How to properly mock MongoDbClient

How to properly mock MongoDbClient


By : user3123362
Date : March 29 2020, 07:55 AM
I wish this help you ProjectsContext is tightly coupled to implementation concerns/details (ie: MongoClient) that make testing it isolation difficult.
IMongoDatabase is the true dependency and should be explicitly injected into the target class.
code :
public class ProjectsContext : IProjectsContext {
    private const string ProjectsCollectionName = "Projects";
    private readonly IMongoDatabase database;
    private IMongoCollection<Project> projects;

    public ProjectsContext(IMongoDatabase database) {
        this.database = database;
    }

    public IMongoCollection<Project> Projects {
        get {
            if (projects is null)
                projects = database.GetCollection<Project>(ProjectsCollectionName);
            return projects;
        }
    }
}
//...ConfigureServices

services.AddScoped<IMongoDatabase>(sp => {
    var dbParams = sp.GetRequiredService<IDatabaseParameters>();
    var client = new MongoClient(dbParams.ConnectionString);
    return client.GetDatabase(dbParams.DatabaseName);
});

//...
[Fact(DisplayName = "Create a Project Context")]
public void CreateProjectContext() {
    // Arrange
    var collectionMock = Mock.Of<IMongoCollection<Project>>();
    var dbMock = new Mock<IMongoDatabase>();
    dbMock.Setup(_ => _.GetCollection<Project>(It.IsAny<string>()))
        .Returns(collectionMock);

    // Act
    var result = new ProjectsContext(dbMock.Object);

    // Assert
    result.Should().NotBeNull()
        .And.BeAssignableTo<IProjectsContext>();
    //Write a test to assert the ProjectCollection
    result.Projects.Should().Be(collectionMock);
}
Script to list the SQL Server Databases, Size and Utilisation by Specific Application or Service

Script to list the SQL Server Databases, Size and Utilisation by Specific Application or Service


By : Mitch
Date : March 29 2020, 07:55 AM
will help you Using EXEC sp_databases may show the wrong sizes for the DB. Here's a nice, reliable query that will give all database names, sizes and statuses, although not which apps are utilising the DBs:
Python using mysql connector list databases LIKE and then use those databases in order and run query

Python using mysql connector list databases LIKE and then use those databases in order and run query


By : grizzlytine
Date : March 29 2020, 07:55 AM
will be helpful for those in need Alas, the two-args form of execute does not support "meta" parameters, such as names of databases, tables, or fields (roughly, think of identifiers you wouldn't quote if writing the query out manually). So, the failing statement:
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