从接受用户定义表类型列表的 dapper 调用存储过程

本文关键字:列表 dapper 调用 存储过程 类型 用户 定义 | 更新日期: 2023-09-27 18:27:58

我有一个存储过程InsertCars它接受用户定义的表类型列表CarType .

CREATE TYPE dbo.CarType
AS TABLE
(
    CARID int null,
    CARNAME varchar(800) not null,
);
CREATE PROCEDURE dbo.InsertCars
    @Cars AS CarType READONLY
AS
-- RETURN COUNT OF INSERTED ROWS
END

我需要从 Dapper 调用此存储过程。我用谷歌搜索了一下,找到了一些解决方案。

 var param = new DynamicParameters(new{CARID= 66, CARNAME= "Volvo"});
 var result = con.Query("InsertCars", param, commandType: CommandType.StoredProcedure);

但是我得到一个错误:

过程或函数 InsertCars 指定的参数过多

存储过程InsertCars还返回插入的行数;我需要获取此值。

问题的根源在哪里?

我的问题是我在通用列表List<Car> Cars中有汽车,我想通过此列表来存储程序。它存在优雅的方式怎么做?

public class Car
{
    public CarId { get; set; }
    public CarName { get; set; }
}

谢谢你的帮助

编辑

我找到了解决方案

Dapper 是否支持 SQL 2008 表值参数?

Dapper 是否支持 SQL 2008 表值参数 2?

所以我尝试制作自己的愚蠢的助手类

class CarDynamicParam : Dapper.SqlMapper.IDynamicParameters
{
    private Car car;
    public CarDynamicParam(Car car)
    {
        this.car = car;
    }
    public void AddParameters(IDbCommand command, SqlMapper.Identity identity)
    {
        var sqlCommand = (SqlCommand)command;
        sqlCommand.CommandType = CommandType.StoredProcedure;
        var carList = new List<Microsoft.SqlServer.Server.SqlDataRecord>();
        Microsoft.SqlServer.Server.SqlMetaData[] tvpDefinition =
                                                                {
                                                                    new Microsoft.SqlServer.Server.SqlMetaData("CARID", SqlDbType.Int),
                                                                    new Microsoft.SqlServer.Server.SqlMetaData("CARNAME", SqlDbType.NVarChar, 100),
                                                                };
        var rec = new Microsoft.SqlServer.Server.SqlDataRecord(tvpDefinition);
        rec.SetInt32(0, car.CarId);
        rec.SetString(1, car.CarName);
        carList.Add(rec);
        var p = sqlCommand.Parameters.Add("Cars", SqlDbType.Structured);
        p.Direction = ParameterDirection.Input;
        p.TypeName = "CarType";
        p.Value = carList;
    }
}

var result = con.Query("InsertCars", new CarDynamicParam(car), commandType: CommandType.StoredProcedure);

我得到例外

使用多映射 API 时,请确保在具有 Id 以外的键时设置 splitOn 参数。

堆栈跟踪:

   at Dapper.SqlMapper.GetDynamicDeserializer(IDataRecord reader, Int32 startBound, Int32 length, Boolean returnNullIfFirstMissing) in c:'Dev'Dapper'Dapper'SqlMapper.cs:line 1308
   at Dapper.SqlMapper.GetDeserializer(Type type, IDataReader reader, Int32 startBound, Int32 length, Boolean returnNullIfFirstMissing) in c:'Dev'Dapper'Dapper'SqlMapper.cs:line 1141
   at Dapper.SqlMapper.<QueryInternal>d__d`1.MoveNext() in c:'Dev'Dapper'Dapper'SqlMapper.cs:line 819
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at Dapper.SqlMapper.Query[T](IDbConnection cnn, String sql, Object param, IDbTransaction transaction, Boolean buffered, Nullable`1 commandTimeout, Nullable`1 commandType) in c:'Dev'Dapper'Dapper'SqlMapper.cs:line 770
   at Dapper.SqlMapper.Query(IDbConnection cnn, String sql, Object param, IDbTransaction transaction, Boolean buffered, Nullable`1 commandTimeout, Nullable`1 commandType) in c:'Dev'Dapper'Dapper'SqlMapper.cs:line 715

怎么了?

固定:

呼叫con.Execute而不是con.Query

从接受用户定义表类型列表的 dapper 调用存储过程

我的问题是我在通用列表列表汽车中有汽车,我想将此列表传递给存储过程。它存在优雅的方式怎么做?

您需要将泛型列表 Car 转换为数据表,然后将其传递给存储过程。 需要注意的一点是,字段的顺序必须与数据库中用户定义的表类型中定义的顺序相同。否则,数据将无法正确保存。并且它还必须具有相同数量的列

我使用此方法将列表转换为数据表。你可以像你的List.ToDataTable((一样称呼它

public static DataTable ToDataTable<T>(this List<T> iList)
    {
        DataTable dataTable = new DataTable();
        PropertyDescriptorCollection propertyDescriptorCollection =
            TypeDescriptor.GetProperties(typeof(T));
        for (int i = 0; i < propertyDescriptorCollection.Count; i++)
        {
            PropertyDescriptor propertyDescriptor = propertyDescriptorCollection[i];
            Type type = propertyDescriptor.PropertyType;
            if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>))
                type = Nullable.GetUnderlyingType(type);

            dataTable.Columns.Add(propertyDescriptor.Name, type);
        }
        object[] values = new object[propertyDescriptorCollection.Count];
        foreach (T iListItem in iList)
        {
            for (int i = 0; i < values.Length; i++)
            {
                values[i] = propertyDescriptorCollection[i].GetValue(iListItem);
            }
            dataTable.Rows.Add(values);
        }
        return dataTable;
    }

我知道这有点旧了,但我想无论如何我都会发布这个,因为我试图让它更容易一点。 我希望我已经使用我创建的 NuGet 包来做到这一点,该包将允许以下代码:

public class CarType
{
  public int CARID { get; set; }
  public string CARNAME{ get; set; }
}
var cars = new List<CarType>{new CarType { CARID = 1, CARNAME = "Volvo"}};
var parameters = new DynamicParameters();
parameters.AddTable("@Cars", "CarType", cars)
 var result = con.Query("InsertCars", parameters, commandType: CommandType.StoredProcedure);

NuGet 包:https://www.nuget.org/packages/Dapper.ParameterExtensions/0.2.0仍处于早期阶段,因此可能无法处理所有内容!

请阅读自述文件,并随时在 GitHub 上做出贡献:https://github.com/RasicN/Dapper-Parameters

您也可以使用查询方法以及执行方法。参数的类型必须是 DataTable,并且可以作为匿名参数集合的一部分提供。如果你的需求很简单,并且不需要构建 DataTable 的通用解决方案,那么一个小的非泛型函数是最简单的:

private DataTable CreateDataTable( IEnumerable<AlertChannelContainer> alertData )
{
    DataTable table = new DataTable();
    table.Columns.Add( "ChannelOrdinal", typeof( int ) );
    table.Columns.Add( "Value", typeof( decimal ) );
    foreach ( var alertChannel in alertData )
    {
        var dataRow = table.NewRow();
        dataRow["ChannelOrdinal"] = alertChannel.ChannelOrdinal;
        dataRow["Value"] = alertChannel.Value;
            table.Rows.Add( dataRow );
    }
    return table;
}

然后就这样称呼它:

var result = await connection.QuerySingleAsync<AlertMetadata>( 
    "[dbo].[InsertAlert]",
    new
    {
        eventId,
        deviceId,
        timestamp,
        alertThresholds = JsonConvert.SerializeObject( rules ),
        data = CreateDataTable( alertData )
    },
    commandType: CommandType.StoredProcedure );

使用反射将对象属性映射到数据表列的成本很高。进一步采用 Ehsan 的解决方案,在性能是一个问题的地方,您可以缓存类型属性映射。正如 Ehsan 还指出的那样,类中的顺序必须与数据库中的顺序相同,并且必须有相等数量的列。这可以通过根据类型定义对列重新排序来克服。

public static class DataTableExtensions
{
    private static readonly EntityPropertyTypeMap PropertyTypeMap = new EntityPropertyTypeMap();
    public static DataTable ToDataTable<T>(this ICollection<T> values)
    {
        if (values is null)
        {
            throw new ArgumentNullException(nameof(values));
        }
        var table = new DataTable();
        var properties = PropertyTypeMap.GetPropertiesForType<T>().Properties;
        foreach (var prop in properties)
        {
            table.Columns.Add(prop.Name, Nullable.GetUnderlyingType(prop.PropertyType) ?? prop.PropertyType);
        }
        foreach (var value in values)
        {
            var propertyCount = properties.Count();
            var propertyValues = new object[propertyCount];
            if (value != null)
            {
                for (var i = 0; i < propertyCount; i++)
                {
                    propertyValues[i] = properties[i].GetValue(value);
                }
            }
            table.Rows.Add(propertyValues);
        }
        return table;
    }
}

public static class DapperExtensions
{
    private static readonly SqlSchemaInfo SqlSchemaInfo = new SqlSchemaInfo();
    public static DataTable ConvertCollectionToUserDefinedTypeDataTable<T>(this SqlConnection connection, ICollection<T> values, string dataTableType = null)
    {
        if (dataTableType == null)
        {
            dataTableType = typeof(T).Name;
        }
        var data = values.ToDataTable();
        data.TableName = dataTableType;
        var typeColumns = SqlSchemaInfo.GetUserDefinedTypeColumns(connection, dataTableType);
        data.SetColumnsOrder(typeColumns);
        return data;
    }
    public static DynamicParameters AddTableValuedParameter(this DynamicParameters source, string parameterName, DataTable dataTable, string dataTableType = null)
    {
        if (dataTableType == null)
        {
            dataTableType = dataTable.TableName;
        }
        if (dataTableType == null)
        {
            throw new NullReferenceException(nameof(dataTableType));
        }
        source.Add(parameterName, dataTable.AsTableValuedParameter(dataTableType));
        return source;
    }
    private static void SetColumnsOrder(this DataTable table, params string[] columnNames)
    {
        int columnIndex = 0;
        foreach (var columnName in columnNames)
        {
            table.Columns[columnName].SetOrdinal(columnIndex);
            columnIndex++;
        }
    }
}
class EntityPropertyTypeMap
{
    private readonly ConcurrentDictionary<Type, TypePropertyInfo> _mappings;
    public EntityPropertyTypeMap()
    {
        _mappings = new ConcurrentDictionary<Type, TypePropertyInfo>();
    }
    public TypePropertyInfo GetPropertiesForType<T>()
    {
        var type = typeof(T);
        return GetPropertiesForType(type);
    }
    private TypePropertyInfo GetPropertiesForType(Type type)
    {
        return _mappings.GetOrAdd(type, (key) => new TypePropertyInfo(type));
    }
}

class TypePropertyInfo
{
    private readonly Lazy<PropertyInfo[]> _properties;
    public PropertyInfo[] Properties => _properties.Value;
    public TypePropertyInfo(Type objectType)
    {
        _properties = new Lazy<PropertyInfo[]>(() => CreateMap(objectType), true);
    }
    private PropertyInfo[] CreateMap(Type objectType)
    {
        var typeProperties = objectType
            .GetProperties(BindingFlags.DeclaredOnly |
                           BindingFlags.Public |
                           BindingFlags.Instance)
            .ToArray();
        return typeProperties.Where(property => !IgnoreProperty(property)).ToArray();
    }
    private static bool IgnoreProperty(PropertyInfo property)
    {
        return property.SetMethod == null || property.GetMethod.IsPrivate || HasAttributeOfType<IgnorePropertyAttribute>(property);
    }
    private static bool HasAttributeOfType<T>(MemberInfo propInfo)
    {
        return propInfo.GetCustomAttributes().Any(a => a is T);
    }
}
public class SqlSchemaInfo
{
    private readonly ConcurrentDictionary<string, string[]> _udtColumns = new ConcurrentDictionary<string, string[]>();
    public string[] GetUserDefinedTypeColumns(SqlConnection connection, string dataTableType)
    {
        return _udtColumns.GetOrAdd(dataTableType, (x) =>
            connection.Query<string>($@"
                    SELECT name FROM 
                    (
                        SELECT column_id, name
                        FROM sys.columns
                        WHERE object_id IN (
                          SELECT type_table_object_id
                          FROM sys.table_types
                          WHERE name = '{dataTableType}'
                        )
                    ) Result
                    ORDER BY column_id").ToArray());
    }
}

[AttributeUsage(AttributeTargets.Property)]
public sealed class IgnorePropertyAttribute : Attribute
{
}

除了上面的Ehsan和Pawan尼泊尔答案之外,我想出了一个适用于.NET Core和.NET的解决方案。以下是执行此操作的步骤。

1.创建扩展方法以将模型转换为数据表(感谢Ehsan提供上面的扩展方法(。

public static DataTable ToDataTable<T>(this List<T> iList)
    {
        DataTable dataTable = new DataTable();
        PropertyDescriptorCollection propertyDescriptorCollection =
            TypeDescriptor.GetProperties(typeof(T));
        for (int i = 0; i < propertyDescriptorCollection.Count; i++)
        {
            PropertyDescriptor propertyDescriptor = propertyDescriptorCollection[i];
            Type type = propertyDescriptor.PropertyType;
            if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>))
                type = Nullable.GetUnderlyingType(type);

            dataTable.Columns.Add(propertyDescriptor.Name, type);
        }
        object[] values = new object[propertyDescriptorCollection.Count];
        foreach (T iListItem in iList)
        {
            for (int i = 0; i < values.Length; i++)
            {
                values[i] = propertyDescriptorCollection[i].GetValue(iListItem);
            }
            dataTable.Rows.Add(values);
        }
        return dataTable;
    }

2.将模型转换为数据表。

var cars = new List<CarType>{new CarType { CARID = 1, CARNAME = "Volvo"}};
DataTable dt = cars.ToDataTable();

3.最后添加UDT作为动态参数并将其传递给查询

 var parameters = new DynamicParameters();
 parameters.Add("@paramFromStoredProcedure", 
 dt.AsTableValuedParameter("YourUDTNameInDataBase"));
 //Pass it to query
var result = con.Query<dynamic>("InsertCars", parameters , commandType: CommandType.StoredProcedure);

另一种解决方案是这样称呼它

var param = new DynamicParameters(new{CARID= 66, CARNAME= "Volvo"});
var result = con.Query<dynamic>("InsertCars", param);

删除:new CarDynamicParam(car(,命令类型:CommandType.StorageProcedure

直接使用表类型的参数,它将起作用。

如果你可以使用Datatable(.net core不支持它(,那么它很容易。

创建数据表 -> 添加

与表类型匹配的必需列 -> 添加所需行。最后就用这样的dapper来称呼它。

var result = con.Query<dynamic>("InsertCars", new{paramFromStoredProcedure=yourDataTableInstance}, commandType: CommandType.StoredProcedure);

添加到上面的 JCisar 结果中,您可以创建一个通用函数,该函数既可用于单个参数,也可用于此处。您可以将返回类型设置为预期结果。

要调用它,你可以做

var cars = new List<CarType>{new CarType { CARID = 1, CARNAME = "Volvo"}};
var parameters = new DynamicParameters();
parameters.AddTable("@Cars", "CarType", cars)

调用函数

ExecuteStordProcedureDynamic("ProcedureName", parameters)

public IEnumerable<T> ExecuteStordProcedureDynamic<T>(String ProcedureName, DynamicParameters Param) where T : class
        {
            using (SqlConnection conn = new SqlConnection(ConnectionString))
            {
                conn.Open();
                var result= conn.Query<T>(ProcedureName, Param, commandType: CommandType.StoredProcedure);
                return result;
            }
        }