Entity Framework Core - 使用带有输出参数的存储过程

Question

我正在尝试将存储过程与新的 Entity Framework Core 一起使用。我需要尽快开始新项目，它将是 ASP.Net 5，但不确定 Entity Framework 是否适合这项工作。该应用程序将每分钟触发几个存储过程，我需要输出参数。 EF 会对此有好处还是我应该使用 ADO.Net？

我已经尝试过 FromSql 和 database.ExecuteSqlCommand 但没有成功。

using (AppDbContext db = factory.Create())
        {
            var in1 = new SqlParameter
            {
                ParameterName = "ParamIn1",
                DbType = System.Data.DbType.Int64,
                Direction = System.Data.ParameterDirection.Input
            };
            var in2 = new SqlParameter
            {
                ParameterName = "ParamIn2",
                DbType = System.Data.DbType.String,
                Direction = System.Data.ParameterDirection.Input
            };
            var out1 = new SqlParameter
            {
                ParameterName = "ParamOut1",
                DbType = System.Data.DbType.Int64,
                Direction = System.Data.ParameterDirection.Output
            };
            var out2 = new SqlParameter
            {
                ParameterName = "ParamOut2",
                DbType = System.Data.DbType.String,
                Direction = System.Data.ParameterDirection.Output
            };

            var result = db.Database.ExecuteSqlCommand("exec spTestSp", in1, in2, out1, out2);
        }

Answer 1

应该可以，但我相信您还需要在命令语句中包含参数名称和OUT 关键字

var sql = "exec spTestSp @ParamIn1, @ParamIn2, @ParamOut1 OUT, @ParamOut2 OUT";
var result = db.Database.ExecuteSqlCommand(sql, in1, in2, out1, out2);

var out1Value = (long) out1.Value;
var out2Value = (string) out2.Value;

Answer 2

StoredProcedureEFCore 扩展支持输出参数

那么用法是这样的

List<Model> rows = null;

ctx.LoadStoredProc("dbo.ListAll")
   .AddParam("limit", 300L)
   .AddParam("limitOut", out IOutParam<long> limitOut)
   .Exec(r => rows = r.ToList<Model>());

long limitOutValue = limitOut.Value;

ctx.LoadStoredProc("dbo.ReturnBoolean")
   .AddParam("boolean_to_return", true)
   .ReturnValue(out IOutParam<bool> retParam)
   .ExecNonQuery();

bool b = retParam.Value;

ctx.LoadStoredProc("dbo.ListAll")
   .AddParam("limit", 1L)
   .ExecScalar(out long l);

Answer 3

上面由@Nkosi 和部分由@Whistler 描述的解决方案的完整示例，以方便未来的读者！

在我的示例中，我试图执行数据库中存在的存储过程以获取特定路径。

string tableName = "DocumentStore";
string path;

        var in1 = new SqlParameter
        {
            ParameterName = "TableName",
            Value = tableName,
            Size = Int32.MaxValue,
            DbType = System.Data.DbType.String,
            Direction = System.Data.ParameterDirection.Input
        };

        var out1 = new SqlParameter
        {
            ParameterName = "Path",
            DbType = System.Data.DbType.String,
            Size = Int32.MaxValue,
            Direction = System.Data.ParameterDirection.Output
        };

        //_context is DbContext Object
        _context.Database.ExecuteSqlCommand("EXEC GetFileTableRootPath @TableName, @Path OUT", in1,out1);

        path = out1.Value.ToString();

Answer 4

**This is a working example**

1)  Create sample SP

--exec [dbo].sampleCalc 100,0,''
CREATE PROCEDURE[dbo].sampleCalc
   @inputPara int,
   @outputPara1 INT OUTPUT,
   @outputPara2 varchar(50) OUTPUT
AS
BEGIN
    set @outputPara1 = @inputPara + 100
    set @outputPara2 = 'result is ' + convert(varchar(50), @outputPara1)
    print @outputPara1
    print @outputPara2
END

2) C#

var param = new SqlParameter[] {
new SqlParameter() {
 ParameterName = "@inputPara",
 SqlDbType =  System.Data.SqlDbType.Int,
 Direction = System.Data.ParameterDirection.Input,
 Value = 100
},
new SqlParameter() {
 ParameterName = "@outputPara1",
 SqlDbType =  System.Data.SqlDbType.Int,
 Direction = System.Data.ParameterDirection.Output,
},
new SqlParameter() {
 ParameterName = "@outputPara2",
 SqlDbType =  System.Data.SqlDbType.VarChar,
 Direction = System.Data.ParameterDirection.Output,
 Size = 50
}};


var sql = "exec sampleCalc @inputPara, @outputPara1 OUT, @outputPara2 OUT";
var resultObj = _context.Database.ExecuteSqlRaw(sql, param.ToArray());

var out1Value = param[1].Value.ToString();
var out2Value = param[2].Value.ToString();