I'm trying to connect my C++ program to Oracle database(12.2).
My C++ program is (I am using g++ compiler in ubuntu),
#include <occi.h>
#include <iostream>
using namespace std;
int main()
{ oracle::occi::Environment *env = oracle::occi::Environment::createEnvironment();
oracle::occi::Connection *conn = env->createConnection("bsk", "oraclepass");
env->terminateConnection(conn);
oracle::occi::Environment::terminateEnvironment(env);
}
I'm getting the error
undefined reference to `oracle::occi::Environment::createEnvironment(oracle::occi::Environment::Mode, void*, void* (*)(void*, unsigned long), void* (*)(void*, void*, unsigned long), void (*)(void*, void*))'
Employees.cpp:(.text+0x169): undefined reference to `oracle::occi::Environment::terminateEnvironment(oracle::occi::Environment*)'
collect2: error: ld returned 1 exit status
I'm new to database connectivity. Can you please help me with this?
From Oracle's website, here is a valid example:
const string userName = "HR";
const string password = "password";
const string connectString = "";
Environment *env = Environment::createEnvironment();
{
Connection *conn = env->createConnection(userName, password, connectString);
Statement *stmt = conn->createStatement("SELECT blobcol FROM mytable");
ResultSet *rs = stmt->executeQuery();
rs->next();
Blob b = rs->getBlob(1);
cout << "Length of BLOB : " << b.length();
...
stmt->closeResultSet(rs);
conn->terminateStatement(stmt);
env->terminateConnection(conn);
}
Environment::terminateEnvironment(env);
Your code seems to be in the right direction. So, it seems that some libraries are missing!
Again, from a different page on Oracle's website , here are the libraries required:
Make sure these libraries are installed on your machine.
try this instead
$ g++ sample.C -I/opt/oracle/11.0.2/rdbms/public/ -L/opt/oracle/11.0.2/lib/ -locci -lclntsh
Replace /opt/oracle/11.0.2
with your oracle home path, it should work.
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