Parses the string as the given numeric typeĮncoded date/time preserving DateTime.Kind The string representation of the enum value In the table any_numeric_type means one of int, short, long, byte, uint, ushort, ulong, sbyte, char, decimal, float, or double. The following table summarizes commonly-used pre-defined conversions from model/property types to database provider types. Var converter = new BoolToZeroOneConverter() This is functionally the same as creating an instance of the built-in BoolToZeroOneConverter and setting it explicitly: protected override void OnModelCreating(ModelBuilder modelBuilder) HasConversion() on a bool property will cause EF Core to convert bool values to numerical zero and one values: protected override void OnModelCreating(ModelBuilder modelBuilder) In many cases EF will choose the appropriate built-in converter based on the type of the property in the model and the type requested in the database, as shown above for enums. Built-in convertersĪs mentioned above, EF Core ships with a set of pre-defined ValueConverter classes, found in the namespace. This can be useful when multiple properties use the same conversion. V => (EquineBeast)Enum.Parse(typeof(EquineBeast), v)) For example: protected override void OnModelCreating(ModelBuilder modelBuilder) The ValueConverter can instead be created explicitly. The ValueConverter classĬalling HasConversion as shown above will create a ValueConverter instance and set it on the property. Then the enum values will be saved as strings in the database without any further configuration in OnModelCreating. For example, if the entity type is defined like so: The same thing can be achieved by explicitly specifying the database column type. Instead, EF Core will pick the conversion to use based on the property type in the model and the requested database provider type.įor example, enum to string conversions are used as an example above, but EF Core will actually do this automatically when the provider type is configured as string using the generic type of HasConversion: protected override void OnModelCreating(ModelBuilder modelBuilder) Then, override ConfigureConventions in your context type and configure the converter as follows: protected override void ConfigureConventions(ModelConfigurationBuilder configurationBuilder)ĮF Core contains many pre-defined conversions that avoid the need to write conversion functions manually. To do this, define your value converter as a class: public class Currenc圜onverter : ValueConverter Rather than doing this manually for each property, you can use pre-convention model configuration to do this once for your entire model. It's common for the same value converter to be configured for every property that uses the relevant CLR type. See GitHub issue #13850 for more information. This makes the implementation of conversions easier and allows them to be shared amongst nullable and non-nullable properties. A null in a database column is always a null in the entity instance, and vice-versa. Character strings that are larger than the page size of the table can be stored as a Character Large Object (CLOB).A null value will never be passed to a value converter. The minimum length of the CHARACTER data type is 1 and it can have a maximum length up to the table page size.

If no length is specified during the declaration, the default length is 1. The length of the character string should be specified in the data type declaration for example, CHARACTER(n) where n represents the desired length of the character string. The CHARACTER data type accepts character strings, including Unicode, of a fixed length. CLOB or CHARACTER LARGE OBJECT or CHAR LARGE OBJECT.PointBase supports the following data types for its column and parameter declarations. Tables are provided at the end of the chapter to show the mappings between PointBase data types and industry standard and other common non-standard data types. The following sections describe each PointBase data type in detail and discuss converting data types. Data types define what type of data a column can contain. This chapter describes all of the SQL data types that PointBase supports.

Sql convert string to int example