using Microsoft.EntityFrameworkCore.Migrations;

#nullable disable

namespace VOL.Core.Migrations
{
    public partial class init023 : Migration
    {
        protected override void Up(MigrationBuilder migrationBuilder)
        {
            // 使用原生 SQL 查询来检查表是否存在并创建表
            migrationBuilder.Sql(@"
            IF NOT EXISTS (SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = 'Sys_District')
            BEGIN
                CREATE TABLE [Sys_District] (
                    [DistrictId] int NOT NULL IDENTITY,
                    [CityCode] nvarchar(50) NULL,
                    [DistrictCode] nvarchar(50) NULL,
                    [DistrictName] nvarchar(50) NULL,
                    CONSTRAINT [PK_Sys_District] PRIMARY KEY ([DistrictId])
                );
            END
        ");

            // 添加列注释
            migrationBuilder.Sql(@"
            IF EXISTS (SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = 'Sys_District')
            BEGIN
                DECLARE @defaultSchema AS sysname;
                SET @defaultSchema = SCHEMA_NAME();

                DECLARE @description AS sql_variant;

                SET @description = N'城市Code';
                EXEC sp_addextendedproperty 'MS_Description', @description, 'SCHEMA', @defaultSchema, 'TABLE', N'Sys_District', 'COLUMN', N'CityCode';

                SET @description = N'区县Code';
                EXEC sp_addextendedproperty 'MS_Description', @description, 'SCHEMA', @defaultSchema, 'TABLE', N'Sys_District', 'COLUMN', N'DistrictCode';

                SET @description = N'区县名称';
                EXEC sp_addextendedproperty 'MS_Description', @description, 'SCHEMA', @defaultSchema, 'TABLE', N'Sys_District', 'COLUMN', N'DistrictName';
            END
        ");
        }

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