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    [转]Linux下g++编译C++连接oracle（OCCI）出现的问题及解决方式

    不会飞的鸟发表于 2014-12-18 05:04:00
    love 0
    由于项目原因，开始学习C++，刚接触半个多月，今天参考网上例子，写了个简单的C++连接ORACLE的DEMO，可是使用g++编译时不顺利，不是报这个错就是那个，最后参考网上的解决方式和个人理解，终于调试好了，现把编译中出现的问题和解决方法总结出来。

    源代码
    C++代码
    1. #include
    2. #include
    3. #include "occi.h"
    4. using namespace oracle::occi;
    5. using namespace std;
    7. int main()
    8. {
    9. string usr="sys";
    10. string pwd="orcl";
    11. string SID="ORCL";
    12. string date;
    14. Environment *env=Environment::createEnvironment(Environment::OBJECT);
    15. Connection *conn= env->createConnection(usr,pwd,SID);//all strings
    16. if(conn)
    17. cout<<"success createConnection!"<
    18. else
    19. cout<<"failure createConnection!"<
    21. Statement *stmt = conn->createStatement();
    22. string sSQL = "select to_char(sysdate,'yyyy-mm-dd hh24:mi:ss') from dual";
    23. stmt->setSQL(sSQL);
    26. ResultSet *rs = stmt->executeQuery();
    27. if(rs->next())
    28. {
    29. date = rs->getString(1);
    30. }
    32. cout<<"now time :"<<
    34. env->terminateConnection(conn);
    35. Environment::terminateEnvironment(env);
    37. return 0;
    38. }
    [c++] view plaincopyprint?
    1. #include
    2. #include
    3. #include "occi.h"
    4. using namespace oracle::occi;
    5. using namespace std;
    7. int main()
    8. {
    9. string usr="sys";
    10. string pwd="orcl";
    11. string SID="ORCL";
    12. string date;
    14. Environment *env=Environment::createEnvironment(Environment::OBJECT);
    15. Connection *conn= env->createConnection(usr,pwd,SID);//all strings
    16. if(conn)
    17. cout<<"success createConnection!"<
    18. else
    19. cout<<"failure createConnection!"<
    21. Statement *stmt = conn->createStatement();
    22. string sSQL = "select to_char(sysdate,'yyyy-mm-dd hh24:mi:ss') from dual";
    23. stmt->setSQL(sSQL);
    26. ResultSet *rs = stmt->executeQuery();
    27. if(rs->next())
    28. {
    29. date = rs->getString(1);
    30. }
    32. cout<<"now time :"<<
    34. env->terminateConnection(conn);
    35. Environment::terminateEnvironment(env);
    37. return 0;
    38. }


    本人linux上安装oracle路径：/opt/app/oracle/product/10.2.0/db_1

    编译命令：g++ -o conn -L/opt/app/oracle/product/10.2.0/db_1/lib -L/opt/oracle/product/10.2.0/db_1/rdbms/lib conn_db.cpp -g

    问题一：编译时报如下错误：
    Shell代码
    1. [oracle@localhost demo]$ g++ g++ -o conn -L/opt/app/oracle/product/10.2.0/db_1/lib -L/opt/oracle/product/10.2.0/db_1/rdbms/lib -lclntsh -locci /usr/lib/libstdc++.so.5 conn_db.cpp -g
    2. g++: g++: No such file or directory
    3. conn_db.cpp:3:18: error: occi.h: No such file or directory
    4. conn_db.cpp:4: error: 'oracle' has not been declared
    5. conn_db.cpp:4: error: 'occi' is not a namespace-name
    6. conn_db.cpp:4: error: expected namespace-name before ';' token
    7. conn_db.cpp: In function 'int main()':
    8. conn_db.cpp:14: error: 'Environment' was not declared in this scope
    9. conn_db.cpp:14: error: 'env' was not declared in this scope
    10. conn_db.cpp:14: error: 'Environment' is not a class or namespace
    11. conn_db.cpp:14: error: 'Environment' is not a class or namespace
    12. conn_db.cpp:15: error: 'Connection' was not declared in this scope
    13. conn_db.cpp:15: error: 'conn' was not declared in this scope
    14. conn_db.cpp:21: error: 'Statement' was not declared in this scope
    15. conn_db.cpp:21: error: 'stmt' was not declared in this scope
    16. conn_db.cpp:26: error: 'ResultSet' was not declared in this scope
    17. conn_db.cpp:26: error: 'rs' was not declared in this scope
    18. conn_db.cpp:35: error: 'Environment' is not a class or namespace


    解决：编译时没有引入OCCI头文件，如果没有，先下载对应的 ORACLE client安装，比如我的是oracle10g,下载了oracle-instantclient-basic- 10.2.0.4-1.i386.zip，解压到一个目录下(/home/oracle/oracle/include)，然后在编译文件的时候引进这个解压目录

    编译命令增加OCCI目录：g++ -o conn -I/home/oracle/oracle/include -L/opt/app/oracle/product/10.2.0/db_1/lib -L/opt/oracle/product/10.2.0/db_1/rdbms/lib conn_db.cpp -g


    问题2：找不到对应函数
    Shell代码
    1. [oracle@localhost demo]$ g++ -o conn -I/home/oracle/oracle/include -L/opt/app/oracle/product/10.2.0/db_1/lib -L/opt/oracle/product/10.2.0/db_1/rdbms/lib conn_db.cpp -Wall -O -g
    2. /tmp/cclFs9xq.o: In function `main':
    3. /home/oracle/oracle/demo/conn_db.cpp:14: undefined reference to `oracle::occi::Environment::createEnvironment(oracle::occi::Environment::Mode, void*, void* (*)(void*, unsigned int), void* (*)(void*, void*, unsigned int), void (*)(void*, void*))'
    4. /home/oracle/oracle/demo/conn_db.cpp:35: undefined reference to `oracle::occi::Environment::terminateEnvironment(oracle::occi::Environment*)'
    5. collect2: ld returned 1 exit status

    解决：增加libocci.so和libclntsh.so指定编译

    修改后的编译命令： g++ -o conn -I/home/oracle/oracle/include -L/opt/app/oracle/product/10.2.0/db_1/lib -L/opt/oracle/product/10.2.0/db_1/rdbms/lib conn_db.cpp -lclntsh -locci -Wall -O -g

    另外可能在引入-lclntsh -locci编译时可能会报找不到以下错误：
    Shell代码
    1. [oracle@localhost demo]$ g++ -o conn -I/home/oracle/oracle/include -L/opt/app/oracle/product/10.2.0/db_1/lib -L/opt/oracle/product/10.2.0/db_1/rdbms/lib conn_db.cpp -lclntsh -locci /usr/lib/libstdc++.so.5 -Wall -O -g
    2. /usr/bin/ld: cannot find -lclntsh
    3. collect2: ld returned 1 exit status
    4. [oracle@localhost demo]$

    解决：这是因为没有找到libclntsh.so和libocci.so链接库,你在可以把oracle client安装目录下把这两个文件拷贝到$ORACLE_HOME/lib目录下，或加到/usr/lib目录下就可以了

    问题三：occi在linux编译运行时报libstdc++.so.6冲突的问题
    Java代码
    1. [oracle@localhost demo]$ g++ -o conn -I/home/oracle/oracle/include -L/opt/app/oracle/product/10.2.0/db_1/lib -L/opt/oracle/product/10.2.0/db_1/rdbms/lib conn_db.cpp -lclntsh -locci -Wall -O -g
    2. /usr/bin/ld: warning: libstdc++.so.5, needed by /opt/app/oracle/product/10.2.0/db_1/lib/libocci.so, may conflict with libstdc++.so.6
    [java] view plaincopyprint?
    1. [oracle@localhost demo]$ g++ -o conn -I/home/oracle/oracle/include -L/opt/app/oracle/product/10.2.0/db_1/lib -L/opt/oracle/product/10.2.0/db_1/rdbms/lib conn_db.cpp -lclntsh -locci -Wall -O -g
    2. /usr/bin/ld: warning: libstdc++.so.5, needed by /opt/app/oracle/product/10.2.0/db_1/lib/libocci.so, may conflict with libstdc++.so.6

    解决：OCCI库在linux编译的时候，由于linux版本太高，会提示以上情况，实际上，在大多数linux系统上，还保留有libstdc++5的库，自己手工在编译的时候加上去就好了

    修改后的编译命令：g++ -o conn -I/home/oracle/oracle/include -L/opt/app/oracle/product/10.2.0/db_1/lib -L/opt/oracle/product/10.2.0/db_1/rdbms/lib -lclntsh -locci /usr/lib/libstdc++.so.5 conn_db.cpp -g

    编译通过后执行结果输出：
    Shell代码
    1. [oracle@localhost demo]$ g++ -o conn -I/home/oracle/oracle/include -L/opt/app/oracle/product/10.2.0/db_1/lib -L/opt/oracle/product/10.2.0/db_1/rdbms/lib conn_db.cpp -lclntsh -locci /usr/lib/libstdc++.so.5 -Wall -O -g
    2. [oracle@localhost demo]$ ./conn
    3. success createConnection!
    4. now time :2010-11-14 22:49:24
    5. [oracle@localhost demo]$




    不会飞的鸟 2014-12-18 13:04 发表评论


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