我正在使用自定义数据处理扩展来调用存储过程。使用扩展程序在报表设计器中创建数据集时出现以下错误。我用C#编写了代码。
无法更新查询的字段列表。验证你可以 连接到数据源,您的查询语法是 正确。(详细信息 - 对象引用未设置为。的实例 对象。)
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Data;
using System.Data.SqlClient;
using Microsoft.ReportingServices.DataProcessing;
using System.Diagnostics;
using System.Text.RegularExpressions;
namespace DataBaseDPE
{
public class DBConnection:Microsoft.ReportingServices.DataProcessing.IDbConnectionExtension
{
private string mconnstring;
private string localname = "Database Connection";
private ConnectionState mState = ConnectionState.Open;
public DBConnection()
{
Debug.WriteLine("DataSetConnection: Default Constructor");
}
public DBConnection(string Dconnection)
{
Debug.WriteLine("DataSetConnection Constructor overloaded with Connection String ");
mconnstring = Dconnection;
}
public Microsoft.ReportingServices.DataProcessing.IDbTransaction BeginTransaction()
{
return (null);
}
public string ConnectionString
{
get
{
return mconnstring;
}
set
{
mconnstring = value;
}
}
public int ConnectionTimeout
{
get
{
return 0;
}
}
public ConnectionState State
{
get
{
return mState;
}
}
public void Open()
{
mState = ConnectionState.Open;
return;
}
public void Close()
{
mState = ConnectionState.Closed;
return;
}
public Microsoft.ReportingServices.DataProcessing.IDbCommand CreateCommand()
{
return new DBCommand(this);
}
public string LocalizedName
{
get
{
return localname;
}
set
{
localname = value;
}
}
public void SetConfiguration(string configuration)
{
try
{
SqlConnection sqlconn = new SqlConnection("Data Source=localhost;Initial Catalog=AdventureWorks2000;Integrated Security=True;");
}
catch (Exception e)
{
throw new Exception(e.Message, null);
}
}
public void Dispose()
{
}
public string Impersonate
{ get; set; }
public bool IntegratedSecurity
{ get; set; }
public string Password
{ get; set; }
public string UserName
{ get; set; }
}
}
using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.ReportingServices.DataProcessing;
using System.Data.SqlClient;
namespace DataBaseDPE
{
public class DBCommand : Microsoft.ReportingServices.DataProcessing.IDbCommand
{
DBConnection mconnection = null;
private string mCmdText;
private int mCmdTimeOut = 30;
private CommandType CmdType;
public DBCommand()
{
}
public DBCommand(string CmdText)
{
mCmdText = CmdText;
}
public DBCommand(DBConnection aConnection)
{
mconnection = aConnection;
}
public void Cancel()
{
throw new NotImplementedException();
}
public string CommandText
{
get
{
return mCmdText;
}
set
{
mCmdText = value;
}
}
public int CommandTimeout
{
get
{
return mCmdTimeOut;
}
set
{
mCmdTimeOut = value;
}
}
public CommandType CommandType
{
get
{
return CmdType;
}
set
{
CmdType = value;
}
}
public IDataParameter CreateParameter()
{
return (null);
}
public class MySqlDataReader:Microsoft.ReportingServices.DataProcessing.IDataReader
{
private System.Data.IDataReader sourceDataReader;
private System.Data.DataTable dt;
private System.Data.DataSet ds;
private int fieldCount = 0;
private string fieldName;
private int fieldOrdinal;
private Type fieldType;
private object fieldValue;
private int currentRow = 0;
public MySqlDataReader(System.Data.IDataReader datareader)
{
this.sourceDataReader = datareader;
}
public MySqlDataReader(System.Data.DataTable dt)
{
// TODO: Complete member initialization
this.dt = dt;
}
public MySqlDataReader(System.Data.DataSet ds)
{
// TODO: Complete member initialization
this.ds = ds;
}
public int FieldCount
{
get
{
fieldCount = ds.Tables[0].Columns.Count;
return fieldCount;
}
}
public Type GetFieldType(int i)
{
fieldType =
ds.Tables[0].Columns[i].DataType;
return fieldType;
}
public string GetName(int i)
{
fieldName = ds.Tables[0].Columns[i].ColumnName;
return fieldName;
}
public int GetOrdinal(string name)
{
fieldOrdinal =
ds.Tables[0].Columns[name].Ordinal;
return fieldOrdinal;
}
public object GetValue(int i)
{
fieldValue =
ds.Tables[0].Rows[this.currentRow][i];
return fieldValue;
}
public bool Read()
{
currentRow++;
if (currentRow >= ds.Tables[0].Rows.Count)
{
return (false);
}
else
{
return (true);
}
}
public void Dispose()
{
}
}
public IDataReader ExecuteReader(CommandBehavior behavior)
{
string query = "SampleSP";
SqlConnection readerconn = new SqlConnection("Data Source=localhost;Initial Catalog=AdventureWorks2000;Integrated Security=SSPI");
SqlCommand readercmd = new SqlCommand(query);
readerconn.Open();
readercmd = readerconn.CreateCommand();
readercmd.CommandText = query;
readercmd.CommandType = System.Data.CommandType.StoredProcedure;
readerconn.Close();
SqlDataAdapter adapter = new SqlDataAdapter(query,readerconn);
readerconn.Open();
adapter.SelectCommand = readercmd;
System.Data.DataTable dt = new System.Data.DataTable();
adapter.Fill(dt);
System.Data.DataSet ds = new System.Data.DataSet();
adapter.Fill(ds);
return new MySqlDataReader(ds);
}
public IDataParameterCollection Parameters
{
get { return (null); }
}
public IDbTransaction Transaction
{
get
{
return (null);
}
set
{
throw new NotImplementedException();
}
}
public void Dispose()
{
}
}
}
答案 0 :(得分:1)
我得到了解决方案,在上面的代码中我没有实现IDataParameter和IDataParameterCollection接口。在实现它们之后,我的代码正在运行,现在我能够获得SSRS报告的数据集。