OTL 4.0, Example 73 (STL std::strings, ANSI C++ typecasts, Oracle 8)

Example 73 (STL std::strings, ANSI C++ typecasts, Oracle 8)

This example demonstrates OTL streams and std::strings. Also, the example shows how to turn on the ANSI C++ typecasts in OTL.

Source Code

#include <iostream>
#include <string>
#define OTL_ORA8 // Compile OTL 4.0/OCI8
#define OTL_STL // Turn on STL features
#define OTL_ANSI_CPP // Turn on ANSI C++ typecasts

#if (defined(__clang__) || defined(__GNUC__)) && \
(defined(OTL_CPP_14_ON) || defined(OTL_CPP_17_ON))
#include <experimental/string_view>
#define OTL_STD_STRING_VIEW_CLASS std::experimental::string_view
#elif defined(_MSC_VER) && (_MSC_VER>=1910) && defined(OTL_CPP_17_ON)
// VC++ 2017 or higher when /std=c++latest is used
#include <string_view>
#define OTL_STD_STRING_VIEW_CLASS std::string_view
#endif
#include <otlv4.h> // include the OTL 4.0 header file using namespace std; otl_connect db; // connect object 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 ); string f2; for(int i=1;i<=100;++i){ f2="NameXXX"; #if defined(OTL_STD_STRING_VIEW_CLASS)
OTL_STD_STRING_VIEW_CLASS f2_sv(f2.c_str(),f2.length());
o<<i<<f2_sv;
#else
o<<i<<f2;
#endif
} } 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 float f1; string f2; i<<8; // assigning :f = 8 // SELECT automatically executes when all input variables are // assigned. First portion of output rows is fetched to the buffer while(!i.eof()){ // while not end-of-data i>>f1>>f2; cout<<"f1="<<f1<<", f2="<<f2<<endl; } i<<4; // assigning :f = 4 // SELECT automatically executes when all input variables are // assigned. First portion of output rows is fetched to the buffer while(!i.eof()){ // while not end-of-data i>>f1>>f2; cout<<"f1="<<f1<<", f2="<<f2<<endl; } } 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; }

Output

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
f1=4, f2=NameXXX
f1=5, f2=NameXXX
f1=6, f2=NameXXX
f1=7, f2=NameXXX
f1=8, f2=NameXXX








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