This example demonstrates STL-compliant OTL stream itertors, std::strings, and ANSI C++ typecasts.
#include <iostream> #include <vector> #include <iterator> #include <string>
#define OTL_ORA7 // Compile OTL 4.0/OCI7 #define OTL_STL // Turn on STL features #define OTL_ANSI_CPP // Turn on ANSI C++ typecasts #include <otlv4.h> // include the OTL 4.0 header file using namespace std; otl_connect db; // connect object // row container class class row{ public: int f1; string f2; // default constructor row(){f1=0;} // destructor ~row(){} // copy constructor row(const row& row) { f1=row.f1; f2=row.f2; } // assignment operator row& operator=(const row& row) { f1=row.f1; f2=row.f2; return *this; } }; // redefined operator>> for reading row& from otl_stream otl_stream& operator>>(otl_stream& s, row& row) { s>>row.f1>>row.f2; return s; } // redefined operator<< for writing row& into otl_stream otl_stream& operator<<(otl_stream& s, const row& row) { s<<row.f1<<row.f2; return s; } // redefined operator<< writing row& into ostream ostream& operator<<(ostream& s, const row& row) { s<<"f1="<<row.f1<<", f2="<<row.f2; return s; } void insert() // insert rows into table { otl_stream o(50, // buffer size "insert into test_tab values(:f1<int>,:f2<char[31]>)", // SQL statement db // connect object ); row r; // single row buffer vector<row> vo; // vector of rows // populate the vector for(int i=1;i<=100;++i){ r.f1=i; r.f2="NameXXX"; vo.push_back(r); } cout<<"vo.size="<<vo.size()<<endl; // insert vector into table copy(vo.begin(), vo.end(), otl_output_iterator<row>(o) ); } void select() { otl_stream i(50, // buffer size "select * from test_tab where f1>=:f<int> and f1<=:f*2", // SELECT statement db // connect object ); // create select stream vector<row> v; // vector of rows // assigning :f = 8 i<<8; // SELECT automatically executes when all input variables are // assigned. First portion of out rows is fetched to the buffer // copy all rows to be fetched into the vector copy(otl_input_iterator<row,ptrdiff_t>(i), otl_input_iterator<row,ptrdiff_t>(), back_inserter(v)); cout<<"Size="<<v.size()<<endl; // send the vector to cout copy(v.begin(), v.end(), ostream_iterator<row>(cout, "\n")); // clean up the vector v.erase(v.begin(),v.end()); i<<4; // assigning :f = 4 // SELECT automatically executes when all input variables are // assigned. First portion of out rows is fetched to the buffer // copy all rows to be fetched to the vector copy(otl_input_iterator<row,ptrdiff_t>(i), otl_input_iterator<row,ptrdiff_t>(), back_inserter(v)); cout<<"Size="<<v.size()<<endl; // send the vector to cout copy(v.begin(), v.end(), ostream_iterator<row>(cout, "\n")); } int main() { otl_connect::otl_initialize(); // initialize OCI environment try{ db.rlogon("scott/tiger"); // connect to Oracle otl_cursor::direct_exec ( db, "drop table test_tab", otl_exception::disabled // disable OTL exceptions ); // drop table otl_cursor::direct_exec ( db, "create table test_tab(f1 number, f2 varchar2(30))" ); // create table insert(); // insert records into table select(); // select records from table } catch(otl_exception& p){ // intercept OTL exceptions cerr<<p.msg<<endl; // print out error message cerr<<p.stm_text<<endl; // print out SQL that caused the error cerr<<p.var_info<<endl; // print out the variable that caused the error } db.logoff(); // disconnect from Oracle return 0; }
vo.size=100 Size=9 f1=8, f2=NameXXX f1=9, f2=NameXXX f1=10, f2=NameXXX f1=11, f2=NameXXX f1=12, f2=NameXXX f1=13, f2=NameXXX f1=14, f2=NameXXX f1=15, f2=NameXXX f1=16, f2=NameXXX Size=5 f1=4, f2=NameXXX f1=5, f2=NameXXX f1=6, f2=NameXXX f1=7, f2=NameXXX f1=8, f2=NameXXX
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