Ef Core Dbquery Stored Procedure

Entity Framework Core has made unit testing CRUD functions much easier, see here for an example of using the In Memory Database, it allows you to search, add, remove and update rows. In this post, we'll talk about how to use a reader to make specific SQL calls based on a repository. I am new to EF Core 2. You can use Entity Framework to map your stored procedures, or you can call them manually. We will use entity framework core Bulk extension to insert, update and delete multiple records. Save files to a table in Database using FileUpload control by RamiVemula · September 9, 2010 At times, it is required to store and retrieve user data in the form of files (typically say PDF, Word, Excel, Text files etc) to and from the database. What we are going to talk about is how to use stored procedures and how you should try to structure your tables and thoughts about them when working with Entity Framework Core 2. You can also use stored procedure for add, update or delete operation when you call DBContext. The following is a. Many a times, we use Entity Framework (EF), Microsoft’s recommended data access technology for an application, to execute (MS SQL Server) Stored Procedure (SP), and retrieve the results emitted by them. With Entity Framework in ASP. Query Types, introduced in Entity Framework Core 2. NET Core: Using Stored Procedures with ADO. Ho bisogno di accedere alle stored procedure utilizzando il mio contesto. If an Entity Framework function mapped to a stored procedure is to have a return value other than null, the value must be provided by the Oracle stored procedure as an OUT parameter of the type SYS_REFCURSOR. NET MVC: Use Entity Framework to return multiple result sets from a Generic Repository If you have a simple generic repository, it doesn't make sense to put everything into one repository. The concept behind CatFactory is to import an existing database from SQL Server instance and then to scaffold a target technology. In this chapter, we will use stored procedures for CUD (create, update, delete) operations for an entity when we call the SaveChanges() method in the database-first approach. At the time of writing this article, EF Core's prescribed way of executing a stored procedure is context. 2 application using EF Core. This means that a stored procedure must return all. Second, syntax highlighting, automatic formatting and intellisense are … Read more LINQ and Entity Framework … sigh. 0 a try and do a benchmark and compare it to Dapper. NET, nor MVC — but all the parts work together and are moving forward. FromSql("EXEC Sp_YourSp") but that is only possible if your stored procedure returns data from a particular DB Set (one table or one entity). The context class (derived from DbContext) must include the DbSet type properties for the entities which map to database tables and views. Create the SQL Server Stored Procedure to Use in Excel. With EF Core struggling to accommodate basic database features such as views and stored procedures, developers are looking elsewhere for their data access needs. You can use Entity Framework to map your stored procedures, or you can call them manually. Use AsEnumerable or AsAsyncEnumerable method right after FromSqlRaw or FromSqlInterpolated methods to make sure that EF Core doesn't try to compose over a stored procedure. The procedures add many procedural elements e. tOracleSP Properties Component family Databases/Oracle Basic settings Use an existing connection Select this check box and in the Component List. Status = 10"); On a new project, I am trying to use Entity Framework Core 2. Anyone who has to deal with legacy code and legacy database will run into a situation where they will need to interface with an existing stored procedure. Create Database Table and Stored Procedures. Working with Stored Procedures in Entity Framework - Part 1. Net MVC 5 Razor. The RTM version of EF Core should be available very soon (end June 2016) but will only include support for calling stored procedures that return entities. To call a stored procedure using Connector/NET, you create a MySqlCommand object and pass the stored procedure name as the CommandText property. So, we have the Student model and the Students table, then we use something like context. With Entity Framework Core removing dbData. A common question about the Entity Framework(EF) is how to use stored procedures within the framework for insert, update and delete operations. (showing articles 1361 to 1380 of 1642). This is useful when the stored procedure inserts data into the database. As much as I dislike using stored procedures in my applications, I often do have to call stored procedures to fetch data from legacy databases. This section guides you through the step by step procedure on how to create a basic web application for the CRUD operations using Entity Framework Core and Asp. The support for stored procedure in EF Core is similar to the earlier versions of EF Code first. Improving EF Core performance with Compiled Queries 20 September 2017 Comments Posted in ef core, performance. When calling a stored procedure that INSERT s a new record into a table with an IDENTITY field, you may want to get back the ID for the newly inserted row. NET Core (Sql Server 2017). An expertly written guide to EF Core—quite possibly the only reference you’ll ever need. 1: Query Types (Working with Views) So far, each of the models we use represents a table in our database, and, we use that model to make queries to that table. alter PROCEDURE GetLecturasEnRangoDeFechas -- Add the parameters for the stored procedure here @fecha as smalldatetime, @idParteMaquina int, @inicio int, @inicioMasDuracion int, @dia smalldatetime AS BEGIN -- SET NOCOUNT ON added to prevent extra result sets from -- interfering with SELECT statements. EF Core does not support all the features offered by Entity Framework 6. In the post I’m going to explain how to map results of a stored procedure to a custom created entity which we have created with the Entity Framework designer. Entity Framework Core (previously known as Entity Framework 7) is a new version of EF designed for use with the new ASP. The above issue is the reason why I feel this article is necessary. tOracleSP Properties Component family Databases/Oracle Basic settings Use an existing connection Select this check box and in the Component List. In this article, you will learn how to execute stored procedures in MVC Core using Entity Framework Core. But unlike FromSql() method, it returns the number of affected rows. ToList() to be able to bring a list of students from the database. 0, alongside. DA: 24 PA: 2 MOZ Rank: 90. Stored procedures typically return resultsets, such as the results of a SELECT query. However, this is no longer available in Entity Framework Core. View Bartłomiej Tyla’s profile on LinkedIn, the world's largest professional community. In a past article, I demonstrated how to return multiple result sets. [storedProcedureName] @Query". We have used stored procedures to handle CRUD operations at the database level. posted on April 14, 2016 by long2know in ASP. no joined tables). Using EF with stored procedures is not recommended. , user-defined type and stored. The stored procedures are executing using the DbContext. Here is a simple stored procedure, it will insert a customer record into a Customers table when executed. In the application where one has used entity framework, one can use entity framework itself to call stored procedure. Entity Framework Core Tutorial Stored Procedure Introduction. I had a lot more content that I could have ever possibly covered in 75 minutes. Estoy usando stored procedure, SQL Server, EF (code first). Step 1: Create a new empty asp. Entity Framework (EF) Core is the lightweight cross-platform version of Entity Framework, the Object/Relational Mapping (O/RM) framework for. It did client evaluation when the SQL was non-composable like a stored procedure. x) framework and ASP. EF Core is now at version 2. 0 with relevant code examples. Хранимые процедуры в Entity Framework Core, определение и вызов хранимых процедур из базы данных в C#, выходные параметры процедур. Here is a simple stored procedure, it will insert a customer record into a Customers table when executed. In this post, we'll talk about how to use a reader to make specific SQL calls based on a repository. Create Database Table and Stored Procedures. aId WHERE b. NET Core API ASP. That post was built on a pre-release version of Entity Framework so I thought I’d provide an updated post on top of the DbContext API surface we ended up shipping. 2 / efcore essa stored procedure torna uma select , como eu faria para buscar o resultado dessa select e trabalhar esses dados com o for each?. And because of this design-time support, there are certain limitations in terms of what your stored procedure can or cannot do. The table on Sheet 2 is based on a stored procedure I've put in as a connection source. Code for calling stored procedure in the Code-Behind to insert a single value from a text box. Estoy intentado llamar este stored procedure desde C#. In this recipe, we will learn how to use stored procedures in EF. How to call a stored procedure using entity framework(edm) Posted on February 27, 2012 by chikkanti First u need to create some database including tables and related stored procedures after completing this task we need to add that data base to our front end as entity framework for that we do some procedure. Here Mudassar Ahmed Khan has explained a simple tutorial with an example, how to call Stored Procedure using Entity Framework in ASP. Calling these crossed methods throws NotSupportedException at. [storedProcedureName] @Query". 5 Service Pack 1. The above issue is the reason why I feel this article is necessary. The code is therefore based on the new. A common scenario is when you wish to generate an SQL query dynamically. Step 1: Create a new empty asp. That applies to Entity Framework Core 1. How to execute SqlQuery with Entity Framework Core 2. ef core Stored Procedure C# asp. GitHub Gist: star and fork AbubakarSiddiq's gists by creating an account on GitHub. Map Stored Procedures to Custom. They were creating an ASP. The following code will execute a stored procedure using Entity Framework Core. NET Core and is an extensible, lightweight and cross-platform version of Entity Framework. I am trying to use EF Core. Efficient querying with LINQ, AutoMapper and Future queries 11 March, 2014. This is extended tool for EntityFrameworkCore. com: using-stored-procedures-entity-framework-scalar-return-values. NET Core has an excellent Dependency Injection feature through which this framework provides you with an object of any class that you want. Name it Demo. Experience in any one of the Frontend Frameworks like Angular or React is added advantage. Let's say i have the following stored procedure, which return results using "SELECT" instead of RETURN. Ever since the beginning of last year, I've been following the development of. It was released along with. Working with Stored Procedures in Entity Framework - Part 1. EF Core can serve as an object-relational mapper (O/RM), enabling. Status = 10"); On a new project, I am trying to use Entity Framework Core 2. Entity Framework (EF) Core is the lightweight cross-platform version of Entity Framework, the Object/Relational Mapping (O/RM) framework for. Use EF's "black box" entity mapping, or roll your own. Alternatively, you can also execute stored procedure using SqlQuery method. Entity Framework performs below expectation when fetching large data, so often we use stored procedure to fetch data. NET objects, and eliminating the need for most of the data-access code they. SqlQuery Je ne trouve pas de solution pour construire une requête SQL brute pour ma requête de recherche en texte intégral qui retournera les données des tables et aussi le rang. This works really well and EF does all the heavy lifting of mapping the result sets to the objects. The latest version of Microsoft Asp. Under the covers, Entity Framework is executing the stored procedure as well. However, I didn't manage to successfully call a stored procedure and then process the value. Here are some of the more popular opti. Sono di applicazione Asp. I wanted to pass in two parameters and get one back, no problem, I've done this with ADO. In the previous chapter, we have seen how to read data using a stored procedure. View Graham Plowman’s profile on LinkedIn, the world's largest professional community. Maybe you are working with a legacy database or maybe you simple like this approach. 2 / efcore essa stored procedure torna uma select , como eu faria para buscar o resultado dessa select e trabalhar esses dados com o for each?. I had a Web API application that I was using to test something that had no database interaction at all that I needed to add database interaction too. Stephen Byrne, Action Point. The Reverse POCO Generator is a T4 template packaged as a Visual Studio extension allowing you to scaffold Entity Framework elements based on an existing database. After many many hours, I have finally figured out how to take an IQueryable object and get the actual SQL statement and parameters. [storedProcedureName] @Query". What is Entity Framework Core? Entity Framework Core (EF Core) is the latest version of the Entity Framework from Microsoft. Before EF Core 3. The database table where the information will be inserted is the Student table. A common scenario is when you wish to generate an SQL query dynamically. public class EmployeeDBContext : DbContext. O EF Core 2. You need to place CALL before your sql stored procedure from memory :) i. EF Core can serve as an object-relational mapper (O/RM), enabling. Let's say i have the following stored procedure, which return results using "SELECT" instead of RETURN. posted on April 14, 2016 by long2know in ASP. You can either use stored procedure or SQL query for all add, update and delete operations with the. 0 Models, Views, Controllers, View Models, Web API, Middle-Tier, Data-Tier (linq-to-entities using the Entity Framework Core), and Stored Procedures or Ad-Hoc SQL in One Click*. Everyone I know does not use EF Core because of this lack of functionality, the few that use, are mapping stored procedures with EF 6. net Core, Entity Framework, MVC and Web API Extensive Experience with SQL Server database, writing PL-SQL, Stored Procedures, Views, Triggers. 0, “Shadow Properties” is one of the new feature of Entity Framework Core. NET Entity Framework Database development with the. However, at times you may need to execute raw queries against the database. 0 (EF Core) as much as any other component of what is broadly termed “. (VS 2008 SP1, 3. We are facing the same issue; we have so many stored procedures and queries that return complex results that do not belong in a DbSet/DbQuery. I frequently get asked if Entity Framework (EF) in a Code First environment supports calling stored procedures. In EF Core there is not quite yet an elegant way to fetch data from multiple tables by a stored procedure. 2 and EF Core, now I'm getting these and I can't figure it out how to fix it or what is wrong. Estou tentando executar um stored procedure em uma chamado no net core 2. We are facing the same issue; we have so many stored procedures and queries that return complex results that do not belong in a DbSet/DbQuery. There are several disadvantages to this method versus new techniques like LINQ and EF. When using Dapper to query a stored procedure from my database with one parameter, it works exactly as expected. aId WHERE b. ExecuteSqlCommand() There are some limitations on the execution of database stored procedures using FromSql or ExecuteSqlCommand methods in EF Core2: Result must be an entity type. Tracing all SQL generated by Entity Framework by Paul Kiddie • March 3, 2013 •. Hope you already know it. Why? Because if the result sets are linked, you should join them and combine into single result sets. First step is to write a method that create a DbCommand from the DbContext. Entity Framework Core provides mechanisms for executing raw SQL queries directly against the database in circumstances where you cannot use LINQ to represent the query (e. Getting Started with Entity Framework Core (PostgreSQL) Entity Framework (EFCore) Core is a lightweight and extensible version of the popular Entity Framework data access stored in the. In this chapter we consider an usage of stored procedures with ORM tools. It can also specify that EF should use your stored procedures for inserting, updating, or deleting entities. I do this so I can optimise the stored procedure with indexes and just make the call from EF Core. I have a need to execute raw SQL query. 0 Preview 1 available. If the username and password are correct but the user has not been activated then the code returned is -2. A preview of what LinkedIn members have to say about Mohsin: “ I know mohsin since 2008 and now he is working at Basecamp data solution as a Technical leader now. EF Code First - Views and Stored Procedures 18 December 2016, C#, Entity Framework. public class EmployeeDBContext : DbContext. I just wrapped up doing my new Entity Framework Core for Enterprise Applications talk at VSLive Austin 2017. (VS 2008 SP1, 3. The short answer is: "In EF6 -- which works. NET web applications so far. Hello Ammad Javaid, Thank you for the bug report. EF Core can serve as an object-relational mapper (O/RM), enabling. 1 was released store functions (i. Status = 10"); On a new project, I am trying to use Entity Framework Core 2. This article presented an overview on the new capabilities in Entity Framework Core 2. Entity Framework Core (EF Core) is a lightweight, extensible, and cross-platform version of Entity Framework. Social para Farmacéuticos de la Provincia de Buenos Aires July 2011 – Present 8 years 5 months. The support for stored procedure in EF Core is similar to the earlier versions of EF Code first. Net CORE - Call stored procedures and Queries Discussion of open issues, suggestions and bugs regarding ADO. Angular 5, ASP. I am your host, Jamie "GaProgMan" Taylor, and this is episode 35: Entity Framework Core with Jon Smith. Discover an ADO. We can also replace the database from SQL Server instance with an in-memory database. As you know, Dapper ORM is free as open source software, it's a micro ORM framework allows you to access data form your database. Estoy usando stored procedure, SQL Server, EF (code first). You can also use stored procedure for add, update or delete operation when you call DBContext. Save files to a table in Database using FileUpload control by RamiVemula · September 9, 2010 At times, it is required to store and retrieve user data in the form of files (typically say PDF, Word, Excel, Text files etc) to and from the database. Graham has 12 jobs listed on their profile. because the results of a view or stored procedure don. 0, I use this code:. However, this is no longer available in Entity Framework Core. The following stored procedure is based on a view which is inserted into a temp table and then updated. FirebirdClient) Data Provider. net MVC (I am using asp 5 mvc 6) So I want to use stored procedures and I found that Dapper-dot-net is solution. If you have been using Entity Framework 6. Even after all these years, I’m still a big fan of ORMs. What is stored procedure in SQL? Why to create stored procedure? Ways of creating stored procedure using SSMS ( SQL Server Management studio) Creating stored procedure; Defining input parameters for stored procedure. Net MVC Core 1. Ghag’s profile on LinkedIn, the world's largest professional community. In EF Core there is not quite yet an elegant way to fetch data from multiple tables by a stored procedure. Entity Framework Core provides mechanisms for executing raw SQL queries directly against the database in circumstances where you cannot use LINQ to represent the query (e. 1, which means that in the examples above, the data is obtained from the database and then the grouping is performed in the client application by C# code if you are working with older versions of EF Core. NET version of the ADO. Call Stored Procedure in Entity Framework - YouTube. NET Core Support : Connect to an Entity Framework Data Source Create a Query or Select a Stored Procedure. Avec Entity Framework, la suppression de Base dbData. 0 MVC views. Entity Framework performs below expectation when fetching large data, so often we use stored procedure to fetch data. Entity framework stored procedure calling. As mentioned in my earlier post Quick summary of what’s new in Entity Framework Core 1. Хранимые процедуры в Entity Framework Core, определение и вызов хранимых процедур из базы данных в C#, выходные параметры процедур. We are facing the same issue; we have so many stored procedures and queries that return complex results that do not belong in a DbSet/DbQuery. Entity Framework Core is a lightweight and extensible version of the popular Entity Framework data access technology. I'm working with asp core 2. You need to place CALL before your sql stored procedure from memory :) i. In the previous tutorial about Entity Framework you learned how to create Entity Data Model and use classes generated from the model to work with the database of SQL Server Expression in a Console Application. Use Entity Framework Function Imports for creating user-defined methods mapped to stored procedures. Ho bisogno di accedere alle stored procedure utilizzando il mio contesto. Entity Framework (EF) Core is a lightweight, extensible, open source and cross-platform version of the popular Entity Framework data access technology. Entity Framework Core & Micro-Orms with Asp. The concept behind CatFactory is to import an existing database from SQL Server instance and then to scaffold a target technology. x) framework and ASP. Returning Data with a SELECT Statement. This tip assumes that readers have already hands on and knowledge of basics of entity framework, ASP. Code for calling stored procedure in the Code-Behind to insert a single value from a text box. Stay tuned for the next installment in this Dapper series. DocumentsInfo. Before EF Core 3. Additionally, the parameters for a stored procedure can also be retrieved via the. The Stored Procedure will be called by passing the parameter value using Entity Framework in ASP. The above issue is the reason why I feel this article is necessary. Saurabh Pati April 28, 2019. They don’t even wanna talk about it. Some provider configuration settings changed their default value. 1 enable you to return non-entity types that map to tables or views and can serve as the return type from FromSql method calls. (C# version on Codeguru. Hope you already know it. Net CORE - Call stored procedures and Queries Discussion of open issues, suggestions and bugs regarding ADO. Implementing flexible logic : Sometimes, with stored procedures it is hard to implement flexible logic compared with dynamic SQL. This means that a stored procedure must return all. To me using Dapper felt like writing SQL, which I try to avoid when possible. You will learn how to build data models, use EF Core to bridge your software with your data store, and how to incorporate all of this into desktop, mobile, and web applications. Therefore, I hope that by now you have had the chance to take it for a spin and use it in your code. As mentioned earlier the context is per session. EntityFrameworkCore. All database operations inside scripts are executed under snapshot isolation scoped to the collection if it is a single-partition collection, or documents with the same partition key value within a collection, if the collection is partitioned. 1 Release Candidate 1 available since 7 may 2018, you can take advantage of the proposed new feature which is Query type. C# Stored Procedure with Parameter call a MySQL stored procedure from within C# how to use stored procedure in c# with example Insert a record using by sql stored procedure in C# Windows Form SQL Server Stored Procedure with C#. Stored procedures can speed up your code by reducing trips to your database -- even if you only have one SQL statement to execute. Con Entity Framework Core eliminando dbData. pdf), Text File (. Stored Procedures The first thing we cover is the use of stored procedures in Entity Framework Core 2. Raw SQL queries can be used to execute a stored procedure. It is important to note that executing stored procedures through EF Core will not return related data (e. EF Code First - Views and Stored Procedures 18 December 2016, C#, Entity Framework. NET Core, things are a little trickier. Sadly, Entity Framework stored procedure functionality is more limited in. 1 Creating a Database with Code First in EF Core. How do you use the stored procedure in an entity framework in ASP. Entity Framework Core & Micro-Orms with Asp. NET platforms, including. At the time of writing this article, EF Core's prescribed way of executing a stored procedure is context. 2 / efcore essa stored procedure torna uma select , como eu faria para buscar o resultado dessa select e trabalhar esses dados com o for each?. With writes, I want tracked entities, managed relationships, cascades and the like. This post will show you how to utilize Entity Framework 6 to execute a stored procedure and materialize multiple result sets. 0 code-first approach? With my previous project, I had an. 0 with relevant code examples. 1? defined a property of type DbQuery I can't find a solution to build a raw SQL Query for my full-text search query that will return the tables data and also the rank. 2, and we have made some preview versions of the provider available. In this post, I'll detail what client libraries are available, as well as show code samples for each of them. Entity Framework Core (previously known as Entity Framework 7) is a new version of EF designed for use with the new ASP. In this episode I interviewed Jon about just what Entity Framework Core is, and how you can use it to speed up the development of your applications. 0 with stored procedure. One of the best books I've read about agile methodologies. SqlQuery seems like this is missing in EF Core even with DbQuery feature 👍. This Video Learning Path is aimed at developers who are somewhat familiar with Entity Framework and. 0 Preview 1 available. Bekijk het profiel van Robbie Luijben op LinkedIn, de grootste professionele community ter wereld. NET CORE (ASP. The Stored Procedure will be called by passing the parameter value using Entity Framework in ASP. FirebirdClient) Data Provider. Everyone I know does not use EF Core because of this lack of functionality, the few that use, are mapping stored procedures with EF 6. Improving EF Core performance with Compiled Queries 20 September 2017 Comments Posted in ef core, performance. Here is a simple stored procedure, it will return all the records from Authors table when executed. So you don’t have to manually create the class object in your code. Sono di applicazione Asp. I have found the blog post where that describes how to use Update stored procedures with EF. The latest version of Microsoft Asp. Entity Framework Core (previously known as Entity Framework 7) is a new version of EF designed for use with the new ASP. Stored Procedure in Entity Framework. Entity Framework Code first does a great job of mapping resultsets to custom types and I didn’t want to lose that functionality since it’s a huge time saver. We can also replace the database from SQL Server instance with an in-memory database. In a past article, I demonstrated how to return multiple result sets from a stored procedure. My stored procedure takes number of 'Context' and I don't know how to deal this, al. Today, I am talking about how to call stored procedure from Entity Framework Core. In this tutorial, we are going to cover Entity Framework Core (EF Core) bulk insert, update and delete options using Asp. Con Entity Framework Core eliminando dbData. NET provider for Oracle 2 posts • Page 1 of 1. We started this effort before EF Core 2. Commonly Used Types: Microsoft. NET objects, and eliminating the need for most of the data-access code they. The DbSet class represents an entity set that can be used for create, read, update, and delete operations. Stored Procedure to Validate the User Credentials The following stored procedure is used to validate the user credentials, this stored procedure first checks whether the username and password are correct else returns -1. As mentioned in my earlier post Quick summary of what’s new in Entity Framework Core 1. Entity Framework Core was created. Creation and maintenance, in Microsoft SQL Server database, triggers , stored procedures, functions and etc Development fullstack of applications web with ASP. Entity Framework Core & Micro-Orms with Asp. Fully-Implemented Stored Procedures — These allowed for more efficient server-side data processing and operations such as inserts, updates, and deletions. However, these software principles and patterns apply equally well to the older Entity Framework, version 6 (EF6. Execute stored procedure using Entity Framework Core in. 1? defined a property of type DbQuery I can't find a solution to build a raw SQL Query for my full-text search query that will return the tables data and also the rank. Entity Framework Code first does a great job of mapping resultsets to custom types and I didn't want to lose that functionality since it's a huge time saver. 0 and copy objects to projects. We implemented this procedure in Part 139 of SQL Server tutorial. You cannot use a mixture of stored procedure and query to add, update and delete operation on the same entity. This post is about how you can develop a generic data access layer (DAL) with full CRUD (Create, Read, Update and Delete) support using Entity Framework 5 with plain old CLR objects (POCOs) and short-lived contexts in a disconnected and stateless N-tier application. In EF Core there is not quite yet an elegant way to fetch data from multiple tables by a stored procedure. 1 Query types are non-entity types (classes) that form part of the conceptual model and can be mapped to tables and views that don't have an identity column specified, or to a DbQuery type. NET version of the ADO. ETAT DES LIEUX : EF CORE 1. Query Types is a new addition to EF Core 2. Our application queries the database primarily using Linq queries backed by Entity Framework but we sometimes call legacy stored procedures. This article presented an overview on the new capabilities in Entity Framework Core 2. NET and SQL server with the help of Visual Studio 2017. The fact-checkers, whose work is more and more important for those who prefer facts over lies, police the line between fact and falsehood on a day-to-day basis, and do a great job. Today, my small contribution is to pass along a very good overview that reflects on one of Trump’s favorite overarching falsehoods. Namely: Trump describes an America in which everything was going down the tubes under  Obama, which is why we needed Trump to make America great again. And he claims that this project has come to fruition, with America setting records for prosperity under his leadership and guidance. “Obama bad; Trump good” is pretty much his analysis in all areas and measurement of U.S. activity, especially economically. Even if this were true, it would reflect poorly on Trump’s character, but it has the added problem of being false, a big lie made up of many small ones. Personally, I don’t assume that all economic measurements directly reflect the leadership of whoever occupies the Oval Office, nor am I smart enough to figure out what causes what in the economy. But the idea that presidents get the credit or the blame for the economy during their tenure is a political fact of life. Trump, in his adorable, immodest mendacity, not only claims credit for everything good that happens in the economy, but tells people, literally and specifically, that they have to vote for him even if they hate him, because without his guidance, their 401(k) accounts “will go down the tubes.” That would be offensive even if it were true, but it is utterly false. The stock market has been on a 10-year run of steady gains that began in 2009, the year Barack Obama was inaugurated. But why would anyone care about that? It’s only an unarguable, stubborn fact. Still, speaking of facts, there are so many measurements and indicators of how the economy is doing, that those not committed to an honest investigation can find evidence for whatever they want to believe. Trump and his most committed followers want to believe that everything was terrible under Barack Obama and great under Trump. That’s baloney. Anyone who believes that believes something false. And a series of charts and graphs published Monday in the Washington Post and explained by Economics Correspondent Heather Long provides the data that tells the tale. The details are complicated. Click through to the link above and you’ll learn much. But the overview is pretty simply this: The U.S. economy had a major meltdown in the last year of the George W. Bush presidency. Again, I’m not smart enough to know how much of this was Bush’s “fault.” But he had been in office for six years when the trouble started. So, if it’s ever reasonable to hold a president accountable for the performance of the economy, the timeline is bad for Bush. GDP growth went negative. Job growth fell sharply and then went negative. Median household income shrank. The Dow Jones Industrial Average dropped by more than 5,000 points! U.S. manufacturing output plunged, as did average home values, as did average hourly wages, as did measures of consumer confidence and most other indicators of economic health. (Backup for that is contained in the Post piece I linked to above.) Barack Obama inherited that mess of falling numbers, which continued during his first year in office, 2009, as he put in place policies designed to turn it around. By 2010, Obama’s second year, pretty much all of the negative numbers had turned positive. By the time Obama was up for reelection in 2012, all of them were headed in the right direction, which is certainly among the reasons voters gave him a second term by a solid (not landslide) margin. Basically, all of those good numbers continued throughout the second Obama term. The U.S. GDP, probably the single best measure of how the economy is doing, grew by 2.9 percent in 2015, which was Obama’s seventh year in office and was the best GDP growth number since before the crash of the late Bush years. GDP growth slowed to 1.6 percent in 2016, which may have been among the indicators that supported Trump’s campaign-year argument that everything was going to hell and only he could fix it. During the first year of Trump, GDP growth grew to 2.4 percent, which is decent but not great and anyway, a reasonable person would acknowledge that — to the degree that economic performance is to the credit or blame of the president — the performance in the first year of a new president is a mixture of the old and new policies. In Trump’s second year, 2018, the GDP grew 2.9 percent, equaling Obama’s best year, and so far in 2019, the growth rate has fallen to 2.1 percent, a mediocre number and a decline for which Trump presumably accepts no responsibility and blames either Nancy Pelosi, Ilhan Omar or, if he can swing it, Barack Obama. I suppose it’s natural for a president to want to take credit for everything good that happens on his (or someday her) watch, but not the blame for anything bad. Trump is more blatant about this than most. If we judge by his bad but remarkably steady approval ratings (today, according to the average maintained by 538.com, it’s 41.9 approval/ 53.7 disapproval) the pretty-good economy is not winning him new supporters, nor is his constant exaggeration of his accomplishments costing him many old ones). I already offered it above, but the full Washington Post workup of these numbers, and commentary/explanation by economics correspondent Heather Long, are here. On a related matter, if you care about what used to be called fiscal conservatism, which is the belief that federal debt and deficit matter, here’s a New York Times analysis, based on Congressional Budget Office data, suggesting that the annual budget deficit (that’s the amount the government borrows every year reflecting that amount by which federal spending exceeds revenues) which fell steadily during the Obama years, from a peak of $1.4 trillion at the beginning of the Obama administration, to $585 billion in 2016 (Obama’s last year in office), will be back up to $960 billion this fiscal year, and back over $1 trillion in 2020. (Here’s the New York Times piece detailing those numbers.) Trump is currently floating various tax cuts for the rich and the poor that will presumably worsen those projections, if passed. As the Times piece reported: