Where(c => searchFrom = This will work but word of caution. NET Type in my EF Core entity model for CustomerLease. Now lets assume what we would do if the LeaseStart was DateTime. We are required to find customer leases that started after a given date. Imagine the following schema for a table called CustomerLease. This is a hot topic when it comes to designing your data access layer but that is a topic for another post. While I don’t have to “construct” SQL with string manipulation, an ORM comes at a cost of not being able to execute the exact SQL I want if I’m using IQueryable to construct my LINQ query. I will do another post about dynamic paging and sorting using EF Core soon.īut this choice comes with trade offs as with any technical decision. But I find constructing paging and sorting dynamically using EF Core IQueryable more appealing than manipulating strings in Dapper. You can easily implement paging and sorting with Dapper too.
I choose to go with EF Core because this specific API had a lot of requirements around paging and sorting (See here for more). When choosing the data access layer for the project I had the option to go with Dapper or EF Core. As developers we have to deal with them often. It’s not uncommon to see these types of data stores though. There are varchar columns for storing boolean, numeric and date/time values. The underlying data is stored in SQL Server 2019 but it is not very well designed. The project involves exposing a set of legacy data through an API. I am working on a greenfield project that uses EF Core 6 with AspNetCore 6 at the moment. Now I can’t write my LINQ query with direct comparison to SearchFrom.
#Sql convert string to int example how to
In this tutorial, you have learned how to use the MySQL CAST() function to convert a value with any type into a value with a specified type.Going down the rabbit hole of EF Core and converting strings to dates
#Sql convert string to int example code
The following statement converts DOUBLE values into CHAR values and uses the results as the arguments of the CONCAT function: SELECT productName,įROM products Code language: SQL (Structured Query Language) ( sql ) WHERE requiredDate BETWEEN CAST( '' AS DATETIME)ĪND CAST( '' AS DATETIME) Code language: SQL (Structured Query Language) ( sql ) However, to be safe, you can use CAST() function to explicitly convert a string into a TIMESTAMP value as follows: SELECT orderNumber, The data type of the requireDate column is DATE, therefore, MySQL has to convert the literal strings: '' and '' into TIMESTAMP values before evaluating the WHERE condition. The query selects orders whose required dates are in January 2003. WHERE requiredDate BETWEEN '' AND '' Code language: SQL (Structured Query Language) ( sql ) See the following query: SELECT orderNumber, Let’s take a look at the orders table in the sample database. The following statement explicitly converts an integer into a string and concatenate the string with another string: SELECT CONCAT( 'MySQL CAST example #', CAST( 2 AS CHAR)) Code language: SQL (Structured Query Language) ( sql ) To explicitly convert a string into an integer, you use the CAST() function as the following statement: SELECT ( 1 + CAST( '1' AS UNSIGNED))/ 2 Code language: SQL (Structured Query Language) ( sql ) In the following example, MySQL converts a string into an integer implicitly before doing calculation: SELECT ( 1 + '1')/ 2 Code language: SQL (Structured Query Language) ( sql ) Let’s take a look at some examples of using the CAST() function. The CAST() function is often used to return a value with a specified type for comparison in the WHERE, JOIN, and HAVING clauses. The target type can be any one of the following types: BINARY, CHAR, DATE, DATETIME, TIME, DECIMAL, SIGNED, UNSIGNED. The CAST() function converts a value of any type into a value that has a specified type. The syntax of the MySQL CAST() function is as follows: CAST(expression AS TYPE) Code language: SQL (Structured Query Language) ( sql ) Summary: in this tutorial, we will show you how to use MySQL CAST function to convert a value of any type into a value with a specified type.
0 kommentar(er)
