Shawn

Shawn Wildermuth

Stories

Tagged with MGraph


M Language Changes Coming in Next CTP

Oslo

If you haven't been following the new Specification for the M Language that the Oslo team has been cooking up, they have been making changes in response to feedback about the language.  These changes will come to light in the next CTP.  These changes are;

'=>' as label binding operator

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How Relationships are Modeled in "MSchema"

Url: http://wilderminds.blob.core.windows.net/downloads/MappingRelation...

Oslo

I've been playing a lot with M to do my database and test data loads for some internal projects for AgiliTrain and I've noticed an interesting representation for how relationships in MSchema are generating their SQL. In MSchema you have a couple of ways to represent a relationship between tables. The relationship syntax is one feature I really like in MSchema.  For example, let's take the Northwind database's Customers and Orders tables. In MSchema I can define them in a traditional way where the Order has a reference to the Customer table:

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MSchema: An Example - Part 3

Url: http://wilderminds.blob.core.windows.net/downloads/StudentSchema.zip

In Part 1 of this series I showed you how to create database schema with MSchema. Then in Part 2 I showed you how to use MGraph to create data to store the in the database along side database schema. In this last part, I will show you how to use the M tools to put the schema and data in the database.  I use these tools to build my database during a build script.

The first thing we need to do is to compile the schema. You can do this with the m.exe tool that ships with the Oslo SDK. While many of the demo's I've seen have pushed the data into the Repository, I want to push it into a generalized database. (My site isn't ready to be build on top of Oslo since its going to be released quite soon so I am just using the MSchema stack to help me build the database). When we compile the schema we can tell the tool type of target we're going to aim for.  In our case we will target TSQL instead of the repository.  So the first call in my database build script is to build the schema like so:

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