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Using parameters with EntityFramework and `FromSql`

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生来不讨喜
生来不讨喜 2021-01-04 06:37 
     public List GetPostsByCompanyId(int id, int s, int d, int p)
{
    string command = @\"select Id,Title,Cities = STUFF(
     (SELECT  \',
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  • 佛祖请我去吃肉
    佛祖请我去吃肉 (楼主)
    2021-01-04 07:17

    While I am calling on SQL stored proc via EF Core, I like to build an array of SqlParameter to help me mash the SQL with params needed in the FromSql call, like this:

    using (var scope = _services.CreateScope())
{
    var parameters = new []
    {
        new SqlParameter("param1", System.Data.SqlDbType.VarChar, 10) { Value = someInboundMethodParam },
        new SqlParameter("param2", System.Data.SqlDbType.VarChar, 50) { Value = Environment.UserName },

        // etc..
    };

    var sql = new System.Text.StringBuilder("exec YourStoreProc");

    sql.Append(string.Join(separator: ",", values: parameters.Select(p => $" @{ p.ParameterName }")));

    var ctx = scope.ServiceProvider.GetRequiredService();

    return await ctx
        .Query()
        .AsNoTracking()
        .FromSql(sql.ToString(), parameters.ToArray())
        .FirstOrDefaultAsync(cancellationToken);
}



    Over some iterations, I built up the following to help me compose the SQL:
    


    public static string GetStoredProcSql(string name, SqlParameter[] parameters)
{
    var stringOfParameters =
        string.Join(
            separator: ",",
            values: parameters.Select(GetStringOfParameterNameValuePairs)
        );
    return $"exec [{name}] {stringOfParameters};";
}

public static string GetStringOfParameterNameValuePairs(SqlParameter parameter)
{
    var name = parameter.ParameterName;
    var value =
        ShouldSqlDbTypeValueRequireQuotes(parameter)
            ? $"\'{parameter.Value}\'"
            : parameter.Value;
    return $" @{name}={value}";
}

public static bool ShouldSqlDbTypeValueRequireQuotes(SqlParameter parameter)
{
    return new Enum[] {
        // SqlDbTypes that require their values be wrapped in single quotes:
        SqlDbType.VarChar,
        SqlDbType.NVarChar
    }.Contains(parameter.SqlDbType);
}

    


    And to use:
    


    public async Task> GetJobList(
    CancellationToken cancellationToken,
    int pageStart = 1,
    int pageSize = 10
)
{
    using (var scope = _services.CreateScope())
    {
        var logger = scope.ServiceProvider.GetRequiredService>();

        logger.LogInformation($"Getting list of share creation jobs..");

        var ctxJob = scope.ServiceProvider.GetRequiredService();

        var sql = SqlDataHelper.GetStoredProcSql(  // use here!
            "GetJobList",
            new[]
            {
                new SqlParameter("pageStart", System.Data.SqlDbType.Int) { Value = pageStart },
                new SqlParameter("pageSize", System.Data.SqlDbType.Int) { Value = pageSize },
                //new SqlParameter("filterFieldValuePairs", System.Data.SqlDbType.VarChar) { Value = filter },
                new SqlParameter("itemType", System.Data.SqlDbType.VarChar, 10) { Value = "Share" },
            });

        return await ctxJob
            .Query()
            .AsNoTracking()
            .FromSql(sql)
            .ToListAsync(cancellationToken);
    }
}

    
    
    
             
    
                                                        
    
            
            
    
              
                
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