EF 迁移 CLI 创建不正确的列数据类型

Question

在 Visual Studio 代码的 ASP.NET Core MVC 教程的第 4 部分中，

dotnet ef migrations add InitialCreate

的 ef 迁移 cli 命令正在生成列类型不正确的迁移文件。

运行

dotnet ef migrations add InitialCreate

后，该命令应采用以下 Movie.cs 类：

using System.ComponentModel.DataAnnotations;

namespace MvcMovie.Models;

public class Movie
{
    public int Id { get; set; }
    public string? Title { get; set; }
    [DataType(DataType.Date)]
    public DateTime ReleaseDate { get; set; }
    public string? Genre { get; set; }
    public decimal Price { get; set; }
}

预期的输出应该是迁移文件“Migrations/{time-stamp}_InitialCreate.cs”，其内容如下：

using System;
using Microsoft.EntityFrameworkCore.Migrations;

#nullable disable

namespace MvcMovie.Migrations
{
    public partial class InitialCreate : Migration
    {
        protected override void Up(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.CreateTable(
                name: "Movie",
                columns: table => new
                {
                    Id = table.Column<int>(type: "int", nullable: false)
                        .Annotation("SqlServer:Identity", "1, 1"),
                    Title = table.Column<string>(type: "nvarchar(max)", nullable: true),
                    ReleaseDate = table.Column<DateTime>(type: "datetime2", nullable: false),
                    Genre = table.Column<string>(type: "nvarchar(max)", nullable: true),
                    Price = table.Column<decimal>(type: "decimal(18,2)", nullable: false)
                },
                constraints: table =>
                {
                    table.PrimaryKey("PK_Movie", x => x.Id);
                });
        }

        protected override void Down(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.DropTable(
                name: "Movie");
        }
    }
}

实际输出是：

using System;
using Microsoft.EntityFrameworkCore.Migrations;

#nullable disable

namespace MvcMovie.Migrations
{
    /// <inheritdoc />
    public partial class InitialCreate : Migration
    {
        /// <inheritdoc />
        protected override void Up(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.CreateTable(
                name: "Movie",
                columns: table => new
                {
                    Id = table.Column<int>(type: "INTEGER", nullable: false)
                        .Annotation("Sqlite:Autoincrement", true),
                    Title = table.Column<string>(type: "TEXT", nullable: true),
                    ReleaseDate = table.Column<DateTime>(type: "TEXT", nullable: false),
                    Genre = table.Column<string>(type: "TEXT", nullable: true),
                    Price = table.Column<decimal>(type: "TEXT", nullable: false)
                },
                constraints: table =>
                {
                    table.PrimaryKey("PK_Movie", x => x.Id);
                });
        }

        /// <inheritdoc />
        protected override void Down(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.DropTable(
                name: "Movie");
        }
    }
}

如上所示，某些属性（如

Price

）会生成“TEXT”类型的列，而不是“decimal(18,2)”类型。

Answer 1

从您的自动增量规范来看，您似乎正在使用 SQLite - 这不支持十进制类型，因此它将回退到使用

TEXT

。