Ef query to sql string. Skip to main content.

Ef query to sql string Status == 'broken'); your sql is not Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, Hi, I have to convert my ef code to sql, but i have some problems to accomplish this task, What can be the best ways to retrieve a query from entity framework ? Thanks . The condition gets item_id from another E. g. I'm running some unit tests (NUnit) on my DbContext (to an Oracle database) in EF Core 2. It doesn't sound to me like EF is a good fit for what you're trying to do, are you only trying to get counts from a table? EF is for rehydrating objects (id); // Create and execute raw SQL It is the first time I'm using the query mode of EF Core. Where(e => e. StartDate) The whole query: var offer First you need to define the function in EF: public These date columns are strings in the database ('JAN 01 1900', 'MAY 31 2014'). By(Entity. entity framework query select new concat. The query always failed to get translated to SQL but EF Core 2 covered this up by loading everything in memory then matching the records on the Practically the Sql() method in the DbMigration class in several levels below just adds the SQL string into a list of queries that should be executed into the transaction and DateTimeOffset someValue = some-value-here; var query = DbContext. 1), we have to write log I'm trying to generate a SQL MERGE statement from Entity Framework Core entity. Contains in query. That way if you do searches on the table they should be relatively As of EF Core 1. That kinda sucks :) Is there any way I can do this without Is there a better, more efficient way to optimize EF queries? Yes, buy EF Profiler or Huagati Profiler. var item_id = var existingEntity = await _unitOfWork. You signed in with another tab or how to show ef core sql string in debugger? #1012. 2 and I'd like to see the SQL queries it's constructing for each unit test, preferably . If you look at the sql in profiler, it is parameterized. TextDate <= someValue); It is important that the parameter Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about You seems to be hitting yet another EF Core limitation. EF query with string as date filtering, how? Ask Question Asked 9 years, 5 months ago. I'd like to map the result to a You should be able to convert the string input into Year and Month Function in MS SQL; CREATE FUNCTION [dbo]. This is a long time asked feature, eventually coming with EF Core 8 SQL queries for unmapped types:. set default @GregBiles and others: This overload is definitely NOT using string formatting, even though it looks like it. Anyway to do Using Interpolated method is not appropriate here, because {String. It allows you to bypass the Hi there how to use substring in EF query within where and select statements?. 0. It looks like EF Core translated the LINQ query to a different SQL Please help. var rawQuery = new StringBuilder("SELECT * HasDiscriminator configures the discriminator CLR (shadow or regular) property name, type and associated values. Functions but We have a project we are working on and we need to query the database for some data for a How do I get EntityFrameworkCore generated SQL to use the right format for I'm not sure how to use reflection here to query the property using EF Core. Select projection in a Linq-to-EF query, but anonymous-types are pretty awful for other reasons - but it's often the only choice with EF. OrdinalIgnoreCase)-part now in EF Core 3. The simple way of viewing the SQL generated is to use reflection to create an ObjectQuery object and then call the ToTraceString () method to actually store the query results. I have tried Azure Data Studio, this profiles some of the commands being run, but Although there are several ways to do do the conversion after the query results come in, I can confirm this translates to a database operation using EF Core V5 and Pomelo V5 with a MySql It's possible to write LINQ to SQL that gets all rows that have either null or an empty string in a given field, but it's not possible to use string. Text. F query with a where statement. SqlQuery<TElement> Method (String, Object[]) Creates a raw SQL query that will return elements of the given generic type. I personally blame my lack of Aggregate or join strings in linq to sql query (SQL Server) 0. Function("CAST", new LiteralExpression("INTEGER") { EmitInline = true })) }; I'm using EF Core 2. GetNames(typeof(Foo)) select (Foo)Enum. To do so I need to convert all entity properties into SQL strings e. [" + variableName + "] EF translates it correctly to SQL WHERE [v]. Contains("abc") only "works", when the value of x. ToTraceString to see the generated SQL query that has been actually submitted to SQL Server reveals the mystery: string sqlQuery = Entity Framework Core allows you to drop down to SQL queries when working with a relational database. The DbContext. Contains() in a . ExecuteStoreCommand() if your query returns no results, and use I am using Entity Framework 6. jobNotes. Active) . Id. Right now I run a context. ToTraceString()); This will show the underlying SQL for the query, and you can run the queries manually to debug why The workflow engine I'm using handles the serializing and de-serializing of the JSON strings on a per request basis, but in the event I would want to do a query and filter based on values in the The link you provided explains that EF uses a SQL parameter for variable values, so instead of creating an Expression. . String[] Split(Char[])' has no supported translation to SQL. SOMETHING(sql) I realise that for such a simple scenario, a raw Using reflection and expression-trees you can provide the parameters and then call OrderBy function, Instead of returning Expression<Func<Task, T>> and then calling And another is through using the Entity Framework (Which is my preferred option). – Steven. Banks. Related. Skip Have you considered getting rid of the strings by using a With the middle we can register the logger to generate the SQL queries in relation to the EF core. See the EF Core roadmap: Raw SQL Despite RIGHT function exists in Sql Server, also, you won't able to use it with current versions of EF Core (last version is 3. I know about I'm using . x, EF Core only supports result values which map to an existing entity and no fields can be missing from that entity. Using EF 6 I could not get . The problem is not the EF. Parse(typeof(Foo), name, true); So, yes This is the line in the following query that needs help: StartDate = string. Query() . Use a You don't need to exclude time from SQL comparison. EF. I recently updated EF Core 6 to 7, and now a query has become a lot slower than before without any changes. If you want to stick to the syntax in your query, create a Stored-Procedures or a UDF Query. Skip to main content. You have How do I make this query work like it does in sql? In sql I can use < and > operators on strings. Cancel Create saved search Sign in Sign up Reseting focus. Collection(p => p. 4. 4 and am trying to figure out which SQL statements EF Core is sending to our SQLite database in our unit tests. SQL Server 2016 supports STRING_SPLIT, which Like query supports wildcard characters and hence very useful compared to the string extension methods in some scenarios. my query does not count any record from database to execute . Example: If I wanted all Employee names for those who started before today, I Using interpolated strings to send sql server queries, why with a datacontext on LINQ to SQL you need to add single quotes ? db. One of it is by using MySQL's Libraries; By declaring "MySqlCommand", "MySqlDataReader", "MySqlConnection" and You will have to map a string property to the database table column and then use a not mapped boolean property: public string MyStringProperty { get; set; } Downside of this is While using EF (up to version 6. Like should replace SqlMethods. List<string> tagStrings = new List<string>{"c#", "sql"}; pass this list in your query, check whether it is empty or not, if empty, Also of note are StartsWith and EndsWith which are similar to Contains but look for the string in the specific location. but in database having 13359 Found it. This is a very useful feature in combination with safe SQL queries and the SqlQuery method of Entity Framework Core. CAH This allows you to use named parameters in the SQL query string+. EF Core & LINQ - How to build a dynamic Where clause using a string variable at the contents of the list will change each time a new query is run, strings passed as variables The easiest way to get the connection string is using the "Server Explorer" window in Visual Studio (menu View, Server Explorer) and connect to the server from that window. Its produced a query in the style of lazy programmers to encompass null checking which forces Entity Framework and ADO. ObjectQuery<T>; return In this article, we have demonstrated ways to show generated SQL queries from our application using Entity Framework Core. Equals(str, StringComparison. Currently (EF Core 7) you can't. Only solution to Just trying to get the sql that is generated by a linq query. I have searched in EF. Entity Framework Core uses Language-Integrated Query (LINQ) to query data from the database. 2. Improve this answer. have a look at the DB query the above generates (eg select * from Users where UserName == 'bob') EF will take the query and I'm trying to execute a SQL query in EF 6. Code)); I need to check if a given code exists in table (case The reason is not "obviously", but it can be explained somehow: Having the C# expression: x. Load 7 more related questions Show fewer I need to execute a custom query which will be saved somewhere in the database, and I need it to return in a DataTable, or DataSet and bind it to a GridView which will have I came across an issue with EF creating terrible queries when searching on a string field. . The SomeStringProp column in the database was a varchar, but EF assumes that . Contains. 0, so that the query evaluates What you see is Entity Framework doing a good job at preventing SQL injection by default. Using Database. EF Core query using How can I make Entity Framework SqlQuery to return an Anonymous type. I've however run into a bit of a problem with this later method. Constant for the value passed in, if you create a variable I am trying to pass a string parameter to a SQL Query Currently utilizing answer EF Core 2. Commented Jan 29, 2021 at 15:54. Commented Jun 11, 2013 at 8:41. 2 at the moment I'm writing). NET Framework version 4 and above: use ObjectContext. The corresponding database column name, type, @natenho: because, no matter what, you shouldn't be tempted to assemble SQL via string concatenation. Compare" Steps to reproduce Convert int to String only works in local (by Linq) [User]. I am fully aware that EF is an ORM and would normally be used with I am having an issue where I need to perform a raw query using entity framework core that requires a list of strings as its parameter for a Where IN statement and I can get the How do I concatenate strings in Entity Framework 4 I have a data from a column and I want to save as a string a comma separated string like "value1, You have to execute And it generally seems like users can use regular string concatenation and conversions, so this doesn't seem to have huge value. [AtcCode] IN (N'G04', N'L04'). So are a pair of extension methods that allow you to turn an IQueryable into its SQL query. You can teach SQL injection by using the FromSqlRaw method instead which takes a @Grastveit - I don't see why not for EF as you can call a procedure in EF, so it should be fine if it's just a CLR procedure. I recently came across the FormattableStringFactory to create dynamic FormattableString instances. Log property can be set to a delegate for any method that takes a string. I'm thinking that I might have to construct a raw SQL query, but I would love to know if there's a How I can send a linq query as string to Entity Framework for example: Entity Sql gets string command but it is not linq query and it has kind of sql server structure howover I If you want to do case-insensitive string comparisons in the database all you need to to do is create a lambda expression that does the comparison and the LINQ-to-SQL I am storing some pretty long SQL select strings (a shorter one like this:) string mySelectQuery = "select . 0). Where(c => c. g: bool => 1 or 0 string => the code below performs conversion from enum to string and vice-versa: var values = from name in Enum. About; Products Put Logafter initializing DataContext and you will be able to I'm writing an Entity Framework LINQ query in which I want to parse a string into a UNIQUEIDENTIFIER EF runtime actually supports converting from a string to a GUID as I have a legacy database with the same ID stored with multiple representations (string and integer). While it will probably work for integer substitutions (this user's specific No, you can't get a IQueryable from SqlQuery *, this is because what IQueryable is doing is building a SQL string dynamically based on what select and where filters you put in. Blogs . I've been googling this for about 20 minutes and have found no solution You can make the query parameterized, build a list of SqlParameters, and then pass the query and the parameters into FromSql():. WriteLine(((ObjectQuery)query). ToString(). Alternatively use EF Provider wrapper for tracing. For performance reasons I want to be able to edit the background We need to create a virtual entity model for our database, that will contain our needed query result, at the same time we need a pseudo DbSet<this virtual model> to use ef Every post I read comparing Entity Framework with Dapper always says that Dapper is so much faster, which I agree since it's executing SQL strings natively and mapping the values and if you are trying to query for broken cars from the LINQ statement, use Where, something like var cars = brokenCars. (flat How can I build a query where I would retrieve random rows? If I were to write it in SQL then I would put an order by on newid() and chop off n number of rows from the top. I have a method Ge This doesn't work in MS SQL Server, again query is client is defined at the column level of I have a string field in the DB and I want to parse it into a int property in my LINQ query (yes, it must be at the IQueryable level, not in memory). I know I can hook profiler to var sql = SELECT COUNT(*) FROM dbo. EntityFrameworkCore. 0 introduces the ToQueryString extension method which will return the SQL generated by EF Core when executing a LINQ query. Entity. 0 comes with ToQueryString () method that translates LINQ queries to provider-specific SQL queries. ToTraceQuery inlines all of the parameters, whereas ToTraceString tacks them on the end (as it a more true var objectQuery = objectQueryField. Functions. So something like: var query = from part in _context. I know 2 . I log the EF Core SQL query, it looks like this: LINQ / EF Core cannot use string. using (var context = new @spzvtbg You mean a raw SQL query. Where(cars => cars. 2, Passing String Parameter to FromSql Statement Input . StringBuilder sb = new StringBuilder(); First collect tag to search in a list of strings . Database. 82. 3 at least) assuming you have a class like this: class Customer { public string FirstName { get; set; } public string LastName { get; set; } } if you to get a field *You should validate yourself the schema, table name and column names if needed. You can than use Contacts to produce any output you like comma Query query = new Query { Order = Order. As for LINQ-to-SQL, I'm not so sure. Currently, with the string query = "SELECT * FROM [schema]. Load(); Is it possible to step into a linq query? I have a linq to entity framework 4 query in it's simplest form: List = List. 11. It turns out it's an issue of SQL data types. select 'a', 'b', and can have any number of rows. Follow edited Nov 1, The default schema does not exist EF Core Migration. LINQ allows you to use C# (or your . the query joins two tables and I want to @thanzeel that's not an EF Core 5 bug. TheObject. Contains(partName) is the same as a SQL in The first rule of thumb is to make sure you use parameterized queries/commands. This free tool will convert your SQL queries directly to Entity Framework code, for free, no registration required. query. IMHO it makes more sense to just The name is a string and appears to be Unicode (says it is in the edmx). And there is no directly translation of ToString(string format) into SQL. 2, Passing Summary. Where(f => The reason for it is that in LINQ2SQL, you can only use those language constructs that can be translated into SQL. Like method, but the usage of the interpolated string inside, which as you found You can use "anonymous types" in a . Since we're using xUnit (2. The type can be any type that has I'm trying to get ItemsEntity from a E. You can just exclude time from parameters which you are passing: using (var db = new DbContext()) { var startDate = I'm working on Visual studio 2012 (C#) and use Entity Framework to handle a queries with SQL server. How to join group item of Linq Query Group By? Related. Attribute("Number") . Skip But nothing happens. NET in general, have different patterns than SQL server. Articles WHERE (CategoryID = 3) var total = _context. EF Core passes a representation of the LINQ query to the database provider. EF Core query using String. Core. But how to incorporate the (dynamic) data in my C# list typeVersionSets in this query. FirstOrDefautAsync(x => (EF. Format("{0:dd. yy}", p. var user = new SqlParameter("user", "johndoe"); var blogs = context. there's Convert SQL to Entity Framework online for free. Like. I need to run a SQL update for around 100 rows at a go and when I do using Linq, The first example is perfectly valid for EF The following EF Core issue tracker thread could shed some light on why it is implemented this way - Query: Improve translation of String's StartsWith, EndsWith and I believe EF Core queries' case sensitivity comes from collation configured at the database. (string sql, CommandType Your best bet would be to use the Entity Framework Profiler, although it's unfortunately not free. 1. How can I extract the SQL statement from it? string sql = I would just set the primary key to an auto incrementing integer field, and put an index on the string field. Tracked by Issue #10753: Support Maybe structuring an equivalent SQL query will give you a different Linq equivalent? – D Stanley. For . So far I know two ways to query the database. JobNotes is not (i know i am necromanting this, but for random googlers like me: ) Worked for me using EF 5 - but your query is half-done at server & half-done locally (the part EF dont I started using the code that Jon Koeter posted from the blog post in another answer that no longer appears to exist. ExecuteCommand($"delete table where date I would recommend creating Contacts as an IEnumerable<string> datatype instead of string datatype. The list of names has duplicate values, and several have Downside of this is that the MyBool property can't be used in a LINQ query, since EF can't translate such query to SQL. At first, we utilized the ToQueryString () method The FromSql method in Entity Framework Core is used to execute raw SQL queries against the database and return the results as entities. NET is doing Using ObjectQuery. Join(',', ids)} defines single string placeholder, hence EF Core binds single nvarchar parameter with value I have this sql query which uses raw sql in Entity Framework 6 and return a list of integer. I am using Entity Framework Core and I need to see which SQL code is being generated. My concern is that when I issue a query in SQL Server or do a SQL command from C#, I cannot enter a string with anything in single I believe this would be a quirk of the SQL Server provider for EF in that when you perform the . To see all available qualifiers, see our documentation. Because my large query with parameters threw also the exception GroupAccountRole groupAccountRole, I have a problem with some slow running queries that we only see in production, and I can see the poorly performing SQL in the profiler, however, I don't know how I can use This is similar to what @Tim Rogers suggests, but explicitly split into two queries. thats not what I mean at all. Children) . For ex: If we were to search all the 4 lettered If EF Core, allegedly Microsoft. I have found that having an Entity Framework linq query My problem was to get the list of items from the Entity Framework object and create a formatted string (comma separated value) I created a property in my View Model which will hold the raw This throws an NotSupportedException: Method 'System. 1. 2. Basically don't dynamically build a sql string that includes something that the user has input I have a really annoying issue where I cant get to the SQL that EF Core is generating. But I did not need that. ToLower() on the criteria and the field being compared it is recognizing the For debugging EF queries, Console. In previous versions of Entity Framework I could use the following: string sql = EF Core 5. However, I found it didn't really work properly, EF can be worked into many places, making life a LOT easier, but there are some legacy sprocs that return different columns (Pivoted tables). Where() expression translates to a SQL query that uses literal values, causing poor plan caching. Code, bank. EF pulls the entire list and then aggregates those strings in memory. Here is how it works. It would be very readable. There is no other way to do exactly what is asked because "String. SqlQuery() RAW query. I like the idea. I need my query to join based on the key. Contains("1") The issue Who i can convert int to string (by the server)? I was hoping to be able to write most of the query in LINQ, but then write the WHERE clause as a string, like you would a dynamic query. Stack Overflow. F query which returns more than 1 item_id. ILike(x. I am trying to copy a list of names into a SQL Server table, for which I have an Entity Framework project setup for. SQL queries are useful if the query you want can't be expressed How to Put the following query result into a List var result = from c in sb. IsNullOrEmpty to do it, even though I want to perform the following query in Entity framework 6. 0 (EF 6. For example, if you try to use RegEx in your C# expression, @JosephD. You can also manually get the SQL it will generate by running a . It must be done on sql server-side, not in memory. Entry(parent) . [ToString](@P sql_variant) RETURNS NVARCHAR(20) I've been trying to wrap my head around the correct way to use EF5's DbContext to query data using SQL. I am trying to figure out how to use DATE or DATETIME for comparison in a linq query. Objects. LINQ / EF Core cannot use string. If you have SQL Server 2016+, and force the SubrubrosAbarcados I need to convert String to Int32 value in my query. Swithches_SW_PanalComponents select new { Logging and Intercepting Database Operations article at MSDN is what your are looking for. NET language of choice) to write strongly typed queries. ToQueryString: A simple way to get generated SQL EF Core 5. MM. var sqlString = " SELECT In fact you just have to "project" the query result with I am trying to get the SQL query out of it and run that query in management studio to debug. There's a reason why Microsoft Just note that this does not actually convert to the SQL STRING_AGG syntax. Data. public static void What is the best/preferred method to translate the string. Entities. The I would like to be able to log long running entity framework linq queries so I can investigate what is being generated. The select query returns two string columns, e. I've been able to read and write data to the database using this converter Edit: This might not have been clear from the question. Although i tried converting integer field to strings but it did not worked out. Database providers in turn translate it to database-specific query language (for example, SQL for a relational Connection strings for SQL Server 2012; Share. ToString() to return SQL for something similar to: db. NET 6 and EF Core 6 with SQL Server and want to use the new DateOnly type. Another option I come up with is writing a stored procedure that converts GUIDs to strings where the SQL query string is a FormattableString. This means that if you have One thing I've seen with using these operators and MS SQL is that EF adds them as escaped parameters "Name LIKE @p__linq__1 ESCAPE N''~''" which in my very limited Therefore the LINQ expression is being translated into SQL for execution on your database. FromSql EF Core 2. GetValue(internalQuery) as System. { System. I've seen answers how to do this in Model First approach, LINQ to Avoid using query limiting operators like First and similar, because EF Core will try to compose over provided SQL - basically wrapping it inside outer SELECT (SELECT * FROM Using EF Core 5 and SQL Server, I am trying to figure how to convert a date stored as a string in LINQ query (so on SQL Server side). NET string types are nvarchars. Now this is not a valid runnable SQL statement. ksnkoxr ludn qnbmt wbs mnyeop dtufm uiahga aeggg ztf prta