Question

连接达梦数据库失败？代码如下，返回的 DataSource 为空

   UGDsConnection *connection = new UGDsConnection;

    connection->m_nType = UGint(UGEngineType::DMPlus);

    connection->m_strAlias = _T("dameng");

    connection->m_strServer = _T("192.168.1.126");

    connection->m_strUser = _T("SUPERMAP");

    connection->m_strPassword = _T("dameng888");

    connection->m_strDatabase = _T("");

    UGDataSource* pDataSource = NULL;

    UGWorkspace *pUGWorkspace = new UGWorkspace;

    if(pUGWorkspace==NULL)

    {

        AfxMessageBox(L"pUGWorkspace false");

    }

    pDataSource = pUGWorkspace->OpenDataSource(*connection);

    if(pDataSource==NULL)

    {

        AfxMessageBox(L"pDataSource false");

    }

Answer 1

您好，iObjects C++ 组件打开达梦数据源，需注意以下几点：

1. 达梦客户端环境配置成功，已添加到系统环境变量，且通过 iDesktopX 或 iServer 可正常连接达梦数据源；
2. 若 iDesktopX 或 iServer 可以正常连接达梦数据源，而 iObjects C++ 组件无法连接，则可以把达梦客户端的依赖库（特别是 dmoci.dll），全部拷贝到 iObjects C++ 的依赖库目录下，再尝试连接达梦数据源；
3. 注意 iObjects C++ 组件接口的使用方式，打开达梦数据源可参考 SuperMap iObjects C++ 之工作空间、数据源、数据集管理_supermap ioobject c++ appenddatasettomap(dataset);-CSDN博客 教程，对打开数据源的代码参数进行微调，改成达梦数据源的参数即可，可参考以下代码示例：

// 构建数据源信息
UGDataSource* datasource = UGDataSourceManager::CreateDataSource(UGEngineType::DMPlus);
UGDsConnection& dsConn = datasource->GetConnectionInfo();
dsConn.m_strServer = _U("");
dsConn.m_strAlias = _U("");
dsConn.m_strUser = _U("");
dsConn.m_strPassword = _U("");
dsConn.m_strDatabase = _U("");
dsConn.m_nType = UGEngineType::DMPlus;

// 打开数据源
if (!datasource->Open())
{
  datasource->Close();
  delete datasource;
}
else
{
  // 数据源打开成功，添加到当前工作空间中
  if (!m_workspace->m_DataSources.Insert(dsConn.m_strAlias, datasource) || !m_workspace->Save()) {}
}

希望可以帮到您。

Comments

运行环境：LInux+QT

已将达梦客户端的依赖库libdmoci.so放入执行目录下。但是执行下面代码后，datasource 依然为空。

UGDataSource* datasource = UGDataSourceManager::CreateDataSource(UGEngineType::DMPlus);

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不止是拷贝 libdmoci.so 一个库文件，把达梦客户端安装目录下的依赖库文件全部拷贝过去试试呢

如果还是失败的话，就把 iObjects C++ 组件的 log 目录下的日志文件内容贴出来看下，应该在您的程序输出目录下能找到日志文件

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日志文件为空，没有任何内容。

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建议您在 iObjects C++ 组件的 bin 目录下找对 SuperMap.xml 文件，打开编辑，找到 <LogLevel> 标签，将标签值从 error 修改为 debug 并保存。

保存后再重新执行您的程序，若依然打开达梦数据源失败，再看 log 目录下的异常日志输出内容。

---

2024-03-07 16:23:12 [info] Compact File open: /data/超图/supermap-iobjectscpp/bin/bin/Marker.sym, ThreadID: 2706426880, Timespan(ms): 0, ResourceID: -100, SourceCode: ../../../Src/CompactFile/UGCompactFile.cpp(108)
2024-03-07 16:23:12 [warning] Index corresponding to ID not exist, ThreadID: 2706426880, Timespan(ms): 3, ResourceID: EDd003, SourceCode: ../../../Src/Symbol/UGSymbolGroup.cpp(281)
2024-03-07 16:23:12 [warning] Failed to remove the symbol of the appointed ID., ThreadID: 2706426880, Timespan(ms): 0, ResourceID: EGa022, SourceCode: ../../../Src/Symbol/UGSymbolGroup.cpp(360)
2024-03-07 16:23:12 [info] Compact File open: /data/超图/supermap-iobjectscpp/bin/bin/Line.lsl, ThreadID: 2706426880, Timespan(ms): 0, ResourceID: -100, SourceCode: ../../../Src/CompactFile/UGCompactFile.cpp(108)
2024-03-07 16:23:12 [warning] Index corresponding to ID not exist, ThreadID: 2706426880, Timespan(ms): 0, ResourceID: EDd003, SourceCode: ../../../Src/Symbol/UGSymbolGroup.cpp(281)
2024-03-07 16:23:12 [warning] Failed to remove the symbol of the appointed ID., ThreadID: 2706426880, Timespan(ms): 0, ResourceID: EGa022, SourceCode: ../../../Src/Symbol/UGSymbolGroup.cpp(360)
2024-03-07 16:23:12 [info] Compact File open: /data/超图/supermap-iobjectscpp/bin/bin/Fill.bru, ThreadID: 2706426880, Timespan(ms): 1, ResourceID: -100, SourceCode: ../../../Src/CompactFile/UGCompactFile.cpp(108)
2024-03-07 16:23:12 [warning] Index corresponding to ID not exist, ThreadID: 2706426880, Timespan(ms): 1, ResourceID: EDd003, SourceCode: ../../../Src/Symbol/UGSymbolGroup.cpp(281)
2024-03-07 16:23:12 [warning] Failed to remove the symbol of the appointed ID., ThreadID: 2706426880, Timespan(ms): 0, ResourceID: EGa022, SourceCode: ../../../Src/Symbol/UGSymbolGroup.cpp(360)

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建议私信我您的联系方式，我远程调试看下

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最终处理方案：客户环境使用的达梦客户端依赖库有问题，重新发给客户可用的达梦客户端依赖库后，客户使用 iObjects C++ 11.0.1 官网版本组件可正常连接达梦数据源