Question

调用Select函数时出现以下错误：

传入的表格数据流（TDS）远程过程调用（RPC）协议流不正确。表值参数3 （“@ SearchTableVar”），第0行，第0列：数据类型0xF3（用户定义 table type）指定了一个非零长度的数据库名称。数据库表值参数不允许使用name，只允许使用模式名称和类型名称有效。

C＃代码

//DTO
public class SP_SearchEntity_Result
{
    public string ID { get; set; }
    public string NAME { get; set; }
}

//Businesslogic
public IQueryable Select(int PageIndex, int PageSize, List<KeyValuePair<string, string>> SearchBy, List<KeyValuePair<string, System.Data.SqlClient.SortOrder>> SortBy)
{
    SqlDatabase obj = (SqlDatabase)DatabaseFactory.CreateDatabase();//System.Configuration.ConfigurationManager.ConnectionStrings["MySqlServer"].ConnectionString
    return obj.ExecuteSprocAccessor<SP_SearchEntity_Result>("SP_SearchEntity", PageIndex, PageSize, SearchBy.ToDataTable(), SortBy.ToDataTable()).AsQueryable<SP_SearchEntity_Result>();
}

//Extension methods
public static DataTable ToDataTable(this List<KeyValuePair<string, string>> source)
{
    DataTable dataTable = new DataTable("Test");
    dataTable.Columns.Add("KEY",typeof(System.String));
    dataTable.Columns.Add("VALUE", typeof(System.String));

    foreach (KeyValuePair<string, string> data in source)
    {
        var dr = dataTable.NewRow();
        dr["KEY"] = data.Key;
        dr["VALUE"] = data.Value;
        dataTable.Rows.Add(dr);
    }

    return dataTable;
}

public static DataTable ToDataTable(this List<KeyValuePair<string, System.Data.SqlClient.SortOrder>> source)
{
    DataTable dataTable = new DataTable("Test");
    dataTable.Columns.Add("KEY", typeof(System.String));
    dataTable.Columns.Add("VALUE", typeof(System.String));

    foreach (KeyValuePair<string, System.Data.SqlClient.SortOrder> data in source)
    {
        var dr = dataTable.NewRow();
        dr["KEY"] = data.Key;
        dr["VALUE"] = data.Value == System.Data.SqlClient.SortOrder.Ascending ? "ASC" : "DESC";
        dataTable.Rows.Add(dr);
    }

    return dataTable;
}

存储过程返回结果中的两个表

SQL proc定义

CREATE TYPE KeyValueTableVariable AS TABLE
(
    [KEY] NVARCHAR(800),
    [VALUE] NVARCHAR(800)
)
GO
CREATE PROCEDURE SP_SearchEntity
@PageIndex INT=NULL,      
@PageSize INT=NULL,     
@SearchTableVar dbo.KeyValueTableVariable READONLY,
@SortTableVar dbo.KeyValueTableVariable READONLY 
AS
BEGIN
    /*Bla bla bla*/
    SELECT '1' as [ID], 'Nitin' as [NAME]
    SELECT '1' as [COUNT]
END

Answer 1

将表值参数传递给SQL Server有许多要求/限制。参见例如“将表值参数传递给存储过程”下的示例：

然后代码定义SqlCommand，将CommandType属性设置为StoredProcedure。使用SqlParameter方法填充AddWithValue，SqlDbType设置为Structured。

请注意，仅使用AddWithValue是不够的 - SqlDbType必须更改为Structured。

我相信 ExecuteSprocAccessor方法不执行此更改（或者可能像其他一些示例中那样TypeName必须设置为表类型的名称）。我不能通过企业库源代码追逐这一切，但由于我在解决方案的任何地方都找不到“结构化”这个词，这就是我得出这个结论的原因。

因此，如果您想使用TVP，我认为您必须放弃企业库并使用SqlClient类型自行编写数据访问代码。（因为您正在使用TVP，所以您已经放弃了切换到不同RDBMS的可能性。）

Answer 2

我发现存储过程参数的xml数据类型更容易使用。不是将参数转换为DataTables，而是将它们转换为XML以用于以下示例：

CREATE PROCEDURE SP_SearchEntity
@PageIndex INT=NULL,      
@PageSize INT=NULL,     
@SearchTableVar xml=NULL,
@SortTableVar xml=NULL
AS
BEGIN
    /*Bla bla bla*/
    SELECT '1' as [ID], 'Nitin' as [NAME]
    SELECT '1' as [COUNT]
END

以下是KeyValuePair和查询序列化为XML后的示例：

declare @sampleXml xml = '
<ArrayOfKeyValuePairOfstringstring xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/System.Collections.Generic">
  <KeyValuePairOfstringstring>
    <key>foo</key>
    <value>bar</value>
  </KeyValuePairOfstringstring>
  <KeyValuePairOfstringstring>
    <key>hello</key>
    <value>world</value>
  </KeyValuePairOfstringstring>
</ArrayOfKeyValuePairOfstringstring>'

select
        Node.Elem.value('*:key[1]', 'nvarchar(800)') as [Key]
        ,Node.Elem.value('*:value[1]', 'nvarchar(800)') as Value
    from @sampleXml.nodes(N'/*:ArrayOfKeyValuePairOfstringstring/*:KeyValuePairOfstringstring') Node(Elem)
go

和XML Serializer：

// from Plinqo: http://www.codesmithtools.com/product/frameworks
public static string ToXml<T>(this T item)
{
    var settings = new XmlWriterSettings();
    settings.Indent = true;
    settings.OmitXmlDeclaration = true;

    var sb = new System.Text.StringBuilder();
    using (var writer = XmlWriter.Create(sb, settings))
    {
        var serializer = new DataContractSerializer(typeof(T));
        serializer.WriteObject(writer, item);
    }

    return sb.ToString();
}

<小时/> 编辑：返回多个结果集并将它们绑定到对象

我将告诉你如何做到这一点，但我不确定这是你想要做什么，基于你的模拟SQL。如果您真的只是返回返回的对象的计数，您可以在IQueryable之后计算结果。

首先，您需要一种绑定对象的方法，您可以通过扩展MVC来获得这些方法。这些模型绑定器希望您的查询返回与您的模型属性匹配的列名。

using System;
using System.Collections.Generic;
using System.Web.Mvc;

public partial class ModelBinder
{
    /// <summary>
    /// Binds the values of an Dictionary to a POCO model
    /// </summary>
    public virtual T BindModel<T>(IDictionary<string, object> dictionary)
    {
        DictionaryValueProvider<object> _dictionaryValueProvider = new DictionaryValueProvider<object>(dictionary, null);
        return BindModel<T>(_dictionaryValueProvider);
    }

    /// <summary>
    /// Binds the values of an IValueProvider collection to a POCO model
    /// </summary>
    public virtual T BindModel<T>(IValueProvider dictionary)
    {
        Type _modelType = typeof(T);
        var _modelConstructor = _modelType.GetConstructor(new Type[] { });
        object[] _params = new object[] { };
        string _modelName = _modelType.Name;
        ModelMetadata _modelMetaData = ModelMetadataProviders.Current.GetMetadataForType(() => _modelConstructor.Invoke(_params), _modelType);
        var _bindingContext = new ModelBindingContext() { ModelName = _modelName, ValueProvider = dictionary, ModelMetadata = _modelMetaData };
        DefaultModelBinder _binder = new DefaultModelBinder();
        ControllerContext _controllerContext = new ControllerContext();
        T _object = (T)_binder.BindModel(_controllerContext, _bindingContext);

        return _object;
    }
}

模型绑定的示例约定：

public partial class Person 
{
    public int Id { get; set; }
    public string Name { get; set; }
    public Project Project { get; set; }
    public List<Person> Friends { get; set; }
}

public partial class Project 
{
    public int Id { get; set; }
    public string Name { get; set; }
}   

select 
    1 as [Id]
    , 'NitinJs' as [Name]
    , 5 as [Project.Id]
    , 'Model Binding' as [Project.Name]
    , 2 as [Friends[0]].Id]
    , 'John' as [Friends[0]].Name]
    , 3 as [Friends[1]].Id]
    , 'Jane' as [Friends[1]].Name]

现在，您需要一种方法来读取您的数据结果并将它们绑定到模型：

/// <summary>
/// Reads a record from a SqlDataReader, binds it to a model, and adds the object to the results parameter
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="reader"></param>
/// <param name="modelName"></param>
/// <param name="results"></param>
private void ReadAs<T>(SqlDataReader reader, string modelName, List<T> results, string commandText) 
{
    Dictionary<string, object> _result = new Dictionary<string, object>();
    for (int i = 0; i < reader.FieldCount; i++)
    {
        string _key = modelName + "." + reader.GetName(i);
        object _value = reader.GetValue(i);

        if (_result.Keys.Contains(_key))    // Dictionaries may not have more than one instance of a key, but a query can return the same column twice
        {                                   // Since we are returning a strong type, we ignore columns that exist more than once.
            throw new Exception("The following query is returning more than one field with the same key, " + _key + ": " + commandText); // command.CommandText
        }

        _result.Add(_key, _value);
    }

    T _object = new ModelBinder().BindModel<T>(_result);

    if (_object != null)
    {
        results.Add((T)_object);
    }        
}

接下来，您需要一种与数据库建立开放连接的方法（注意：您可能希望从配置中获取_dbConnectionString）：

public SqlConnection GetOpenConnection()
{
    _sqlConnection = new SqlConnection(_dbConnectionString); 
    _sqlConnection.Open();
    return _sqlConnection;
}

最后，您需要连接到数据库以获取结果集：

/// <summary>
/// Executes a SqlCommand that expects four result sets and binds the results to the given models
/// </summary>
/// <typeparam name="T1">Type: the type of object for the first result set</typeparam>
/// <typeparam name="T2">Type: the type of object for the second result set</typeparam>
/// <returns>List of Type T: the results in a collection</returns>
public void ExecuteAs<T1, T2>(SqlCommand command, List<T1> output1, List<T2> output2)
{
    string _modelName1 = typeof(T1).Name;
    string _modelName2 = typeof(T2).Name;
    string _commandText = command.CommandText;

    using (SqlConnection connection = GetOpenConnection())
    {
        using (command)
        {
            command.Connection = connection;
            command.CommandTimeout = _defaultCommandTimeout;
            using (SqlDataReader reader = command.ExecuteReader())
            {
                while (reader.Read())                                               // Call Read before accessing data.
                {
                    ReadAs<T1>(reader, _modelName1, output1, _commandText);
                }

                reader.NextResult();

                while (reader.Read())                                               // Call Read before accessing data.
                {
                    ReadAs<T2>(reader, _modelName2, output2, _commandText);
                }
            } // end using reader
        } // end using command
    } // end using connection
}

然后你的select方法看起来更像这样：

public void SelectInto<SP_SearchEntity_Result, int>(int PageIndex, int PageSize, List<KeyValuePair<string, string>> SearchBy, List<KeyValuePair<string, System.Data.SqlClient.SortOrder>> SortBy, List<<SP_SearchEntity_Result> result1, List<int> result2)
{
    SqlCommand command = new SqlCommand("SP_SearchEntity");
    command.CommandType = System.Data.CommandType.StoredProcedure;
    command.Parameters.Add("PageIndex", SqlDbType.Int).Value = PageIndex;
    command.Parameters.Add("SearchTableVar", SqlDbType.Xml).Value = SearchBy.ToXml();

    List<KeyValuePair<string, string>> SortByCastToString = // modify your ToDataTable method so you can pass a List<KeyValuePair<string, string>> for SortBy
    command.Parameters.Add("SortTableVar", SqlDbType.Xml).Value = SortByCastToString.ToXml();

    ExecuteAs<SP_SearchEntity_Result, int>(command, result1, result2); 
}

public void SomeCallingMethod()
{
    List<SP_SearchEntity_Result> _results = new List<SP_SearchEntity_Result>{};
    List<int> _counts = new List<int>{};
    // ...
    // setup your SearchBy and SortBy
    // ...

    SelectInto<SP_SearchEntity_Result, int>(1, 20, SearchBy, SortBy, _results, _counts);
}

Answer 3

使用企业库数据访问应用程序块v6.0.1304，TVP作为存储过程的参数对我来说很有用。我的C＃代码如下所示：

public static DataSet SomeHelperMethod(DataTable tvp1, DataTable tvp2)
{
    DbCommand cmd = <SqlDatabase>.GetStoredProcCommand("StoredProcName");

    SqlParameter p1 = new SqlParameter("@p1", tvp1);
    p1.SqlDbType = SqlDbType.Structured;
    cmd.Parameters.Add(p1);

    SqlParameter p2= new SqlParameter("@p2", tvp2);
    p2.SqlDbType = SqlDbType.Structured;
    cmd.Parameters.Add(p2);

    return <SqlDatabase>.ExecuteDataSet(cmd);
}

表值参数不允许使用数据库名称

3 个答案: