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来自Dapper 是否支持 SQL 2008 表值参数的代码？效果很好。

但是随着 MSSQL SQL_VARIANT 列的出现（通常）麻烦......

private static string ConnectionString = @"data source=192.168.1.1;initial catalog=;persist security info=False;user id=sa;password=";

private static void TestTVP2()
    {
        var connection = new SqlConnection(ConnectionString);
        connection.Open();

        var nums =
            connection
            .Query<BigIntKeySqlVariantValueType.TypeFields>("[dbo].[pmesAttributeValueUpdate]", new BigIntKeySQLVariantValueTVP(new[]
                    {
                        new BigIntKeySqlVariantValueType.TypeFields{ParameterName = 9976669, ParameterValue= 8.5}
                    }, "@tvp")
                ).ToList();

        foreach (var num in nums)
        {
            Console.WriteLine(num.BigIntKeySqlVariantValueTypeId + " " + num.ParameterName + " " +
                              num.ParameterValue);
        }
    }


internal class BigIntKeySQLVariantValueTVP : SqlMapper.IDynamicParameters
{
    private readonly IEnumerable<BigIntKeySqlVariantValueType.TypeFields> _values;
    private readonly string _parametername;

    public BigIntKeySQLVariantValueTVP(IEnumerable<BigIntKeySqlVariantValueType.TypeFields> values, string parametername)
    {
        this._values = values;
        this._parametername = parametername;
    }

    public void AddParameters(IDbCommand command)
    {
        var sqlCommand = (SqlCommand)command;
        sqlCommand.CommandType = CommandType.StoredProcedure;

        var numberList = new List<SqlDataRecord>();

        // Create an SqlMetaData object that describes our table type.
        SqlMetaData[] tvpDefinition =
            {
                new SqlMetaData(
                    "BigIntKeySQLVariantValueTypeId", SqlDbType.BigInt, true, false, SortOrder.Unspecified, -1),
                new SqlMetaData("ParameterName", SqlDbType.BigInt),
                new SqlMetaData("ParameterValue", SqlDbType.Variant),
            };

        foreach (var n in _values)
        {
            // Create a new record, using the metadata array above.
            var rec = new SqlDataRecord(tvpDefinition);

            rec.SetInt64(1, n.ParameterName); // Set the value.
            rec.SetValue(2, n.ParameterValue);

            numberList.Add(rec); // Add it to the list.
        }

        // Add the table parameter.
        var p = sqlCommand.Parameters.Add(_parametername, SqlDbType.Structured);
        p.Direction = ParameterDirection.Input;
        p.TypeName = "BigIntKeySQLVariantValueType";
        p.Value = numberList;
    }

    public void AddParameters(IDbCommand command, SqlMapper.Identity identity)
    {
        AddParameters(command);
    }
}

public class BigIntKeySqlVariantValueType 
{
    /// <summary>
    /// Type POCO
    /// </summary>
    public struct TypeFields
    {
        public long BigIntKeySqlVariantValueTypeId { get; private set; }

        public long ParameterName { get; set; }

        public object ParameterValue { get; set; }
    }
}

下面是 Dapper 生成的代码，如 SQL Profiler 中所示：

declare @p1 dbo.BigIntKeySQLVariantValueType
insert into @p1 values(9976669,8,5)
exec [dbo].[pmesAttributeValueUpdate] @tvp=@p1

我的表值类型：

CREATE TYPE [dbo].[BigIntKeySQLVariantValueType] AS TABLE(
    [BigIntKeySQLVariantValueTypeId] [bigint] IDENTITY(1,1) NOT NULL,
    [ParameterName] [bigint] NULL,
    [ParameterValue] [sql_variant] NULL,
    PRIMARY KEY CLUSTERED 
(
    [BigIntKeySQLVariantValueTypeId] ASC
)WITH (IGNORE_DUP_KEY = OFF)
)

Dapper 生成的代码应该是：

insert into @p1 values(9976669,8.5)

如何用点“替换”逗号SqlParameter

        // Add the table parameter.
        var p = sqlCommand.Parameters.Add(_parametername, SqlDbType.Structured);
        p.Direction = ParameterDirection.Input;
        p.TypeName = "BigIntKeySQLVariantValueType";
        p.Value = numberList;
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1 回答 1

0

事实证明，逗号而不是句点的值仅显示在 SQL Profiler 和 Console.Write 中。

向数据库传递正确的浮点值。

于 2013-04-18T11:54:31.050 回答