Posted November 29, 2018 09:16:52A database diagram is a diagram that lists the dependencies between objects.
It provides an overview of the objects that must be maintained, and is used to build software.
The diagram is written in a language called Visual Basic.
This article will walk you through setting up a Database Diagram using Visual Basic and Windows PowerShell.
The diagram uses the following code:$dbx = Get-DatabaseDiagram -database dbName -type database | Get-DiagramDatabase | Where-Object {$_.
Name -eq “Database Diagram”}The diagram is stored in a file named dbo.xml.
If you open the file, you will see that it is a simple XML file containing the following information:Database DiagmeDatabase DiangmeName is the name of the database that the diagram is generated for.
It is a string that can contain the names of databases, their names, their descriptions, and their versions.
For example, the diagram for the “database name” table would be “dbname.com”In this diagram, each row of the diagram describes the dependencies that need to be maintained between objects in order to run a program.
The objects that need the information are specified in the following rows:Database Name Name of the object to be added to the diagram.
This is a list of the names that are defined for each object.
This object can be the name or an instance of a class, an object, or any other object that implements a database interface.
For more information, see the table “Type of Database Interface” in the Object Database Interface section of the Entity Framework Reference Manual.
Version of the Database Interface SpecificationVersion of an object that defines the database interface that is used for the object.
For each row in the diagram, the information in the column named “Type” is the version of the specification for that object.
For instance, “4.0” is a version of 4.0.0, which is used by all versions of SQL Server.
This table also contains the version number for the version information for all objects that have the Database Diagname parameter.
For more information about Database Diagnostics, see Database Diaggeration.
You can set up the database diagram in Visual Studio by using the DbDependencyManagement cmdlet.
For information about DbDiagManagement, see DbModuleManagement.
In the following example, I create a database using the database name that is specified in my database diagram.
I then add a table named tableName and add a column named tableId in the table that contains the table name.
I add the following method to the method of DbModifyDatabase:$dbo = Get,Modify,Get-Database,TableName,TableId | WhereProperty {$.
TableName -like “TableName”}$db = new-object -type directory -computername $db -database dboTo use this method, I first create the table.
I open the Dbsite.ps1 file and add the methods from the previous section to the following line.
$dbsite = new Dbsiteserver -Nameserver dbname -Namespace root -ServerName $dbhost -DomainName $domainName -DbsiteFile $dbo.ps3Next, I add a new property in the method that defines how the database will be set up.
For this example, if the database contains two objects that share the same tableName, I define the property as follows.
If one of the two objects is a table, I declare that the property to be true.
If both are tables, I do not declare the property.
$tableId = $dbi.
GetTableName($tableName) $objectName = $db.
GetObjectName($objectName)$db.
SetObjectName($tableId,$objectName,$tableName,0)Next, the method is used.
I set up an object named tableNumber, and set the property of the property that indicates which object should be the primary key for the table: $objectNumber = $DbModifiedObjects.
GetKey($tableNumber)If I change the property values, the property changes for the primary keys of both objects.
To verify that the primarykeys are correct, I change my primarykey to false and create the object that will be the key for both tables: $Dbi.
SetPrimaryKey($objectNumber)This procedure changes the value of the primarykey of the table number from false to true, and also sets the property for the property I defined earlier to true.
For the primary Keys property, I set it to true and also set the PropertyName property of my primary object to $objectID.$dbi = new dbsite -Nameservers dbname,DomainName root,ServerName