在Visual Studio2008里尝试连接MySql数据库,一直会得到如下的错误信息未能打开倒以下数据库的连接:"无法加载名称为
MySql.Data.VisualStudio.StoredProcedureColumnEnumerator
的类型"请检查连接并重试因此始终无法正确添加数据源到VS里,不知道这个问题应该如何解决呢?
MySql.Data.VisualStudio.StoredProcedureColumnEnumerator
的类型"请检查连接并重试因此始终无法正确添加数据源到VS里,不知道这个问题应该如何解决呢?
Added: branches/6.0/MySql.VisualStudio/DDEX/StoredProcedureColumnEnumerator.cs
===================================================================using System;
using Microsoft.VisualStudio.Data;
using System.Data.Common;
using Microsoft.VisualStudio.Data.AdoDotNet;
using System.Data;namespace MySql.Data.VisualStudio
{
class StoredProcedureColumnEnumerator : DataObjectEnumerator
{
public override DataReader EnumerateObjects(string typeName, object[] items,
object[] restrictions, string sort, object[] parameters)
{
DbConnection conn = (DbConnection)Connection.GetLockedProviderObject();
try
{
string spName = String.Format("{0}.{1}", restrictions[1],restrictions[2]); if (conn.State != ConnectionState.Open)
conn.Open(); string[] parmRest = new string[5];
parmRest[1] = (string)restrictions[1];
parmRest[2] = (string)restrictions[2];
parmRest[3] = (string)restrictions[3];
DataTable parmTable = conn.GetSchema("Procedure Parameters", parmRest); DbCommand cmd = conn.CreateCommand();
cmd.CommandText = spName;
cmd.CommandType = CommandType.StoredProcedure; foreach (DataRow row in parmTable.Rows)
{
if (row["ORDINAL_POSITION"].Equals(0)) continue; DbParameter p = cmd.CreateParameter();
p.ParameterName = row["PARAMETER_NAME"].ToString();
p.Value = GetDefaultValue(row["DATA_TYPE"].ToString());
cmd.Parameters.Add(p);
} using (IDataReader reader = cmd.ExecuteReader(CommandBehavior.SchemaOnly))
{
DataTable dt = reader.GetSchemaTable();
dt.Columns.Add(new DataColumn("RoutineName", typeof(string)));
foreach (DataRow row in dt.Rows)
{
row["RoutineName"] = restrictions[2];
string basedb = row["BaseSchemaName"] as string;
if (String.IsNullOrEmpty(basedb) || row["BaseSchemaName"] == DBNull.Value)
row["BaseSchemaName"] = cmd.Connection.Database;
} return new AdoDotNetDataTableReader(dt);
}
}
finally
{
Connection.UnlockProviderObject();
}
} private object GetDefaultValue(string dataType)
{
if (dataType == "VARCHAR" || dataType == "VARBINARY" ||
dataType == "ENUM" || dataType == "SET" || dataType == "CHAR")
return "";
return 0;
}
}
}
然后再你的程序项目文件中引用。
<Compile Include="DDEX\MySqlDataViewCommandHandler.cs" />
<Compile Include="DDEX\MySqlDataViewSupport.cs" />
<Compile Include="DbObjects\ColumnWithTypeDescriptor.cs" />
<Compile Include="DDEX\StoredProcedureColumnEnumerator.cs" />
<Compile Include="Editors\CustomPropertyDescriptor.cs" />
<Compile Include="Editors\ForeignKeyDialog.cs">
<SubType>Form</SubType>
嗯,我按2楼的方法再试一下好了。希望能够暂时解决。
<Compile Include="DDEX\MySqlDataViewCommandHandler.cs" />
<Compile Include="DDEX\MySqlDataViewSupport.cs" />
<Compile Include="DbObjects\ColumnWithTypeDescriptor.cs" />
<Compile Include="DDEX\StoredProcedureColumnEnumerator.cs" />
<Compile Include="Editors\CustomPropertyDescriptor.cs" />
<Compile Include="Editors\ForeignKeyDialog.cs">
<SubType>Form </SubType> ”上面这段是什么意思呢,是不是说要把CS文件放在DDEX文件夹里呢,哪里可以找到DDEX文件夹?
<Compile Include="DDEX\StoredProcedureColumnEnumerator.cs" /> 名字和路径你自己都可以定义。