Raw SQL Query without DbSet - Entity Framework Core

Raw SQL Query without DbSet - Entity Framework Core

In Entity Framework Core, you can execute raw SQL queries without using a DbSet by using the DbContext.Database property, which provides access to a set of methods for interacting with the database directly.

Here's an example of how to execute a raw SQL query using DbContext.Database:

using (var context = new MyDbContext())
{
    var results = context.Database.ExecuteSqlRaw("SELECT * FROM MyTable");

    // process results here
}

In this example, we're using the ExecuteSqlRaw method to execute a raw SQL query and return the number of rows affected by the query. You can replace the SQL query with any valid SQL statement.

If you want to retrieve data from the database, you can use the FromSqlRaw method to execute a raw SQL query and map the results to an entity or a custom type:

using (var context = new MyDbContext())
{
    var results = context.MyEntity.FromSqlRaw("SELECT * FROM MyTable WHERE MyColumn = {0}", parameterValue).ToList();

    // process results here
}

In this example, we're using the FromSqlRaw method to execute a raw SQL query and map the results to a list of MyEntity objects. You can replace the SQL query with any valid SQL statement that returns data from the MyTable table. The parameterValue parameter is used to pass a parameter value to the SQL query. You can use this approach to safely parameterize your SQL queries and avoid SQL injection attacks.

Examples

  1. "Raw SQL Query without DbSet in Entity Framework Core"

    • Description: Learn how to execute raw SQL queries in Entity Framework Core without using a DbSet. This example demonstrates a generic approach to execute a raw SQL query and map the results to a DTO (Data Transfer Object).
    // Raw SQL Query without DbSet in Entity Framework Core
using (var context = new YourDbContext())
{
    var sqlQuery = "SELECT Column1, Column2 FROM YourTable WHERE SomeCondition = {0}";
    var parameterValue = "SomeValue";

    var results = context.Set<YourDto>().FromSqlRaw(sqlQuery, parameterValue).ToList();
}

  2. "Entity Framework Core raw SQL query with complex types"

    • Description: Explore executing a raw SQL query without DbSet in Entity Framework Core using complex types. This code demonstrates mapping the result to a complex type or view model.
    // Raw SQL query without DbSet with complex types in Entity Framework Core
using (var context = new YourDbContext())
{
    var sqlQuery = "SELECT Column1, Column2 FROM YourTable WHERE SomeCondition = {0}";
    var parameterValue = "SomeValue";

    var results = context.Set<YourComplexType>().FromSqlRaw(sqlQuery, parameterValue).ToList();
}

  3. "Entity Framework Core raw SQL query with anonymous types"

    • Description: Learn how to execute a raw SQL query without DbSet in Entity Framework Core using anonymous types. This example illustrates creating an anonymous type to represent the query result.
    // Raw SQL query without DbSet with anonymous types in Entity Framework Core
using (var context = new YourDbContext())
{
    var sqlQuery = "SELECT Column1, Column2 FROM YourTable WHERE SomeCondition = {0}";
    var parameterValue = "SomeValue";

    var results = context.Set<YourAnonymousType>().FromSqlRaw(sqlQuery, parameterValue).ToList();
}

  4. "Entity Framework Core raw SQL query for read-only operations"

    • Description: Understand how to perform read-only operations with raw SQL queries without DbSet in Entity Framework Core. This code snippet demonstrates executing a SELECT query without tracking changes.
    // Raw SQL query without DbSet for read-only operations in Entity Framework Core
using (var context = new YourDbContext())
{
    var sqlQuery = "SELECT Column1, Column2 FROM YourTable WHERE SomeCondition = {0}";
    var parameterValue = "SomeValue";

    var results = context.Set<YourDto>().FromSqlRaw(sqlQuery, parameterValue).AsNoTracking().ToList();
}

  5. "Entity Framework Core raw SQL query with JOIN operations"

    • Description: Explore executing raw SQL queries without DbSet in Entity Framework Core for JOIN operations. This example illustrates performing a query involving JOIN clauses.
    // Raw SQL query without DbSet with JOIN operations in Entity Framework Core
using (var context = new YourDbContext())
{
    var sqlQuery = "SELECT t1.Column1, t2.Column2 FROM Table1 t1 JOIN Table2 t2 ON t1.Id = t2.Table1Id WHERE SomeCondition = {0}";
    var parameterValue = "SomeValue";

    var results = context.Set<YourDto>().FromSqlRaw(sqlQuery, parameterValue).ToList();
}

  6. "Entity Framework Core raw SQL query with GROUP BY and aggregates"

    • Description: Learn how to use raw SQL queries without DbSet in Entity Framework Core for GROUP BY and aggregate operations. This code demonstrates querying and aggregating data.
    // Raw SQL query without DbSet with GROUP BY and aggregates in Entity Framework Core
using (var context = new YourDbContext())
{
    var sqlQuery = "SELECT Column1, COUNT(Column2) as Count FROM YourTable GROUP BY Column1";
    var results = context.Set<YourDto>().FromSqlRaw(sqlQuery).ToList();
}

  7. "Entity Framework Core raw SQL query for complex filtering"

    • Description: Explore executing complex raw SQL queries without DbSet in Entity Framework Core for scenarios with intricate filtering conditions. This example demonstrates crafting SQL queries for specific complex filtering requirements.
    // Raw SQL query without DbSet for complex filtering in Entity Framework Core
using (var context = new YourDbContext())
{
    var sqlQuery = "SELECT * FROM YourTable WHERE Column1 LIKE {0} AND Column2 > {1}";
    var parameter1 = "FilterValue1%";
    var parameter2 = 42;

    var results = context.Set<YourDto>().FromSqlRaw(sqlQuery, parameter1, parameter2).ToList();
}

  8. "Entity Framework Core raw SQL query with ORDER BY clause"

    • Description: Learn how to execute raw SQL queries without DbSet in Entity Framework Core with an ORDER BY clause. This code snippet demonstrates incorporating an ORDER BY clause into the SQL query.
    // Raw SQL query without DbSet with ORDER BY clause in Entity Framework Core
using (var context = new YourDbContext())
{
    var sqlQuery = "SELECT Column1, Column2 FROM YourTable ORDER BY Column1 DESC";
    var results = context.Set<YourDto>().FromSqlRaw(sqlQuery).ToList();
}

  9. "Entity Framework Core raw SQL query for data pagination"

    • Description: Understand how to implement data pagination with raw SQL queries without DbSet in Entity Framework Core. This example shows executing a paginated SQL query.
    // Raw SQL query without DbSet for data pagination in Entity Framework Core
using (var context = new YourDbContext())
{
    var sqlQuery = "SELECT Column1, Column2 FROM YourTable ORDER BY Column1 OFFSET {0} ROWS FETCH NEXT {1} ROWS ONLY";
    var skipAmount = 10;
    var pageSize = 5;

    var results = context.Set<YourDto>().FromSqlRaw(sqlQuery, skipAmount, pageSize).ToList();
}

  10. "Entity Framework Core raw SQL query with dynamic columns"

    • Description: Learn how to execute raw SQL queries without DbSet in Entity Framework Core with dynamic columns. This example demonstrates creating dynamic SQL queries based on runtime conditions.
    // Raw SQL query without DbSet with dynamic columns in Entity Framework Core
using (var context = new YourDbContext())
{
    var dynamicColumns = "Column1, Column2";
    var sqlQuery = $"SELECT {dynamicColumns} FROM YourTable WHERE SomeCondition = {{0}}";
    var parameterValue = "SomeValue";

    var results = context.Set<YourDto>().FromSqlRaw(sqlQuery, parameterValue).ToList();
}

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