sqlcmd 失败，“;”附近的语法不正确升级到 .NET 8 后

Question

我们从 .NET 6 升级到 .NET 8，现在 dotnet-ef 工具会在两者之间生成换行符，这是 sqlcmd 不喜欢的。它是兼容级别 150 的 Azure SQL 数据库。

dotnet ef migrations script --project hidden --startup-project hidden --output AppDbContext.sql --context AppDbContext --verbose --idempotent

sqlcmd -S "hidden" -d "hidden" -U "hidden" -P "hidden" -i "D:\AppDbContext.sql"
Msg 102, Level 15, State 1, Server hidden, Line 11
Incorrect syntax near ';'.

我手动运行了SQL，看起来它不是空的

BEGIN...END

：

IF NOT EXISTS (
    SELECT * FROM [Historical].[EFMigration]
    WHERE [MigrationId] = N'20210814000018_AddSPHedgeReport'
)
BEGIN




END;
GO

EF6 没有用来生成这个。

using Microsoft.EntityFrameworkCore.Migrations;

namespace hidden
{
    public partial class AddSPHedgeReport : Migration
    {
        protected override void Up(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.AddColumn<string?>(
                name: "FixedProperty",
                schema: "Reports",
                table: "SectionColumn",
                nullable: true);
            migrationBuilder.RunScripts("20210813");

        }

        protected override void Down(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.DropColumn(
                name: "FixedProperty",
                schema: "Reports",
                table: "SectionColumn");
        }

    }
}

另一个失败的例子：

#nullable disable

using Microsoft.EntityFrameworkCore.Migrations;

namespace hidden
{
    public partial class AuditTables : Migration
    {
        protected override void Up(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.RunScripts("20220920");
        }

        protected override void Down(MigrationBuilder migrationBuilder)
        {

        }
    }
}

这是

ScriptHelper

的作用：

public static class ScriptHelper
{
    public static void RunScripts(this MigrationBuilder migrationBuilder, string version)
    {
        var assembly = Assembly.GetExecutingAssembly();
        var resourceNames = assembly.GetManifestResourceNames().Where(str => str.EndsWith(version + ".sql"));
        foreach (var resourceName in resourceNames)
        {
            using (var stream = assembly.GetManifestResourceStream(resourceName))
            using (var reader = new StreamReader(stream))
            {
                var sql = reader.ReadToEnd();
                migrationBuilder.Sql(sql);
            }
        }
    }
}

Answer 1

使用

Trim()

方法可以有效地删除 SQL 脚本中的前导和尾随空格，增强其兼容性并防止执行过程中出现与格式相关的错误。

public static class ScriptHelper
{
    public static void RunScripts(this MigrationBuilder migrationBuilder, string version)
    {
        var assembly = Assembly.GetExecutingAssembly();
        var resourceNames = assembly.GetManifestResourceNames().Where(str => str.EndsWith(version + ".sql"));
        foreach (var resourceName in resourceNames)
        {
            using var stream = assembly.GetManifestResourceStream(resourceName);
            using var reader = new StreamReader(stream);
            //Removes white spaces or characters specified in an array of characters from the beginning and end of a string.
            var sql = reader.ReadToEnd().Trim();
                
            if (!string.IsNullOrWhiteSpace(sql))
            {
                migrationBuilder.Sql(sql);
            }
        }
    }
}