Join Olivia Stone for an in-depth discussion in this video Database query, part of LINQ with C# Essential Training.
- With everything set up to create and execute LINQ queries…with the SQL Database,…I can create my LINQ queries in almost the exact same way…as I had before.…I've created a Where query to find the customers in Oregon.…Notice that instead of an IEnumerable,…I've specified that the return query…will have implemented the IQueryable Interface.…Up until now, I've been looking…at what are called Local queries,…and they're called that because they use collections…that are local to the application.…When working with databases,…now I am looking to execute queries on data…in a remote location,…and these are called Interpreted queries.…
The queries will ultimately need to be translated…to the query language specific to the data source.…In this case, the LINQ queries will ultimately be translated…to SQL queries when they execute.…IQueryable inherits from IEnumerable,…and helps with that translation between the LINQ queries…and the query language for the data source.…Now that the query has been defined,…I'll run it and see the same results as I had before…
Author
Olivia Stone
Released
11/30/2015In LINQ with C# Essential Training, engineer Olivia Chiu introduces techniques for querying, updating, and transforming data with LINQ. She covers standard queries—such as finding overlaps in two datasets and creating hierarchies—as well as complex chained queries. She also shows how to group and join LINQ queries with lambda expressions, and use LINQ to query SQL databases and XML documents. Last but not least, Olivia provides tips for optimizing the performance of your queries.
- Creating and executing a LINQ query
- Returning results
- Changing the data source type
- Performing standard queries
- Working with lambda expressions
- Chaining and complex queries
- Querying SQL and XML
- Performing tree queries
- Using sequences, elements, and scalars
- Allocating memory
Skill Level Intermediate
Duration
Views
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Introduction
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Welcome55s
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Use the exercise files1m 6s
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1. Introduction to LINQ
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Common use cases1m 45s
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2. Basic LINQ Queries
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Select a data source3m 6s
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Create a query1m 33s
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Execute a query1m 56s
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3. Data Transformation
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Return results as a new type1m 39s
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4. Type Relationships
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5. Standard Queries
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Parse basic groups4m 30s
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Create hierachy in a dataset3m 50s
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6. Lambda Expressions
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Lambda expressions3m 25s
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Index and distinct operators2m 22s
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Take and skip operators2m 47s
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7. Complex Queries
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Chaining2m 9s
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Use the into keyword3m 45s
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Use the let keyword3m 4s
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8. LINQ to SQL
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Database setup3m 58s
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Database query1m 48s
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Database updates2m 56s
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9. LINQ to XML
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Tree creation4m 10s
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Tree queries1m 43s
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10. Other Operators
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11. Performance
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Memory allocation1m 54s
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Best practices1m 40s
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Conclusion
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Next steps44s
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Video: Database query