通过控制面板->管理工具->Event Viewer->Windows Log->Application Logs, 可以看到可以看到是如下错误
“C:\Windows\oraocci11d.dll”的激活上下文生成失败。 找不到从属程序集 Microsoft.VC90.DebugCRT,processorArchitecture="x86",publicKeyToken="1fc8b3b9a1e18e3b",type="win32",version="9.0.21022.8"。 请使用 sxstrace.exe 进行详细诊断。
原因:
1. 没有安装Microsoft.VC90.DebugCRT,processorArchitecture="x86"
2. 使用了DEBUG版本的oraocci11d.lib 和oraocci11d.dll 动态链接库
解决办法
1. 安装Microsoft.VC90.DebugCRT
2. 或者不要使用DEBUG版本的occi 动态链接库
还有一个ResultSet->getString()的内存错误
解决办法:
- 我用的是VC++2010, 下载与VC++2010对应的OCCI DLL库
- 并且occi 的版本要和oci.dll版本匹配,否则可能会出现"11g无法定位程序输入点OCIPHeapAllocUc于动态连接库OCI.DLL上"的问题
- http://www.oracle.com/technetwork/database/occidownloads-083553.html
总之:VC++版本, OCCI DLL版本, OCI DLL版本三者必须一致。
OCCI示例代码
1 void test() { 2 3 std::string userName = "scott"; 4 std::string password = "tiger"; 5 std::string connectString = "ORCL"; 6 //Environment::createEnvironment("AL32UTF8","UTF8"); 7 oracle::occi::Environment *env = oracle::occi::Environment::createEnvironment("AL32UTF8","UTF8"); 8 { 9 oracle::occi::Connection *conn = env->createConnection( 10 userName, password, connectString); 11 oracle::occi::Statement *stmt = conn->createStatement( 12 "SELECT DEPTNO, DNAME FROM DEPT"); 13 oracle::occi::ResultSet *rs = stmt->executeQuery(); 14 while( rs->next() ) { 15 //oracle::occi::Blob b = rs->getBlob(1); 16 int i =rs->getInt(1); 17 std::string dn =rs->getString(2); 18 //std::cout << "Length of BLOB : " << b.length() << std::endl; 19 //std::cout << "dname : " << dname << std::endl; 20 std::cout << "deptno : " << i << std::endl; 21 std::cout << "dname : " << dn << std::endl; 22 } 23 stmt->closeResultSet(rs); 24 conn->terminateStatement(stmt); 25 env->terminateConnection(conn); 26 } 27 28 oracle::occi::Environment::terminateEnvironment(env); 29 }