ex258_oci8.cpp

一个跨平台的数据库操作库文件,可以轻松在linux和windows下进行数据库读写以及其他的操作,支持多种数据库,代码包含很多example,初学者很容易上手. OTL 是 Oracle, Odbc

#include <iostream>
using namespace std;

#include <stdio.h>

#define OTL_ORA9I // Compile OTL 4.0/OCI9i
// #define OTL_ORA8
// #define OTL_ORA8I

#if defined(_MSC_VER) // VC++

// Enabling support for 64-bit signed integers
// Since 64-bit integers are not part of the ANSI C++
// standard, this definition is compiler specific.
#define OTL_BIGINT __int64

// Defining a bigint constant that is larger than
// the max 32-bit integer value.
const OTL_BIGINT BIGINT_VAL1=12345678901234000;

// Defining a string-to-bigint conversion 
// that is used by OTL internally.
// Since 64-bit ineteger conversion functions are
// not part of the ANSI C++ standard, the code
// below is compiler specific
#define OTL_STR_TO_BIGINT(str,n)                \
{                                               \
  n=_atoi64(str);                               \
}

// Defining a bigint-to-string conversion 
// that is used by OTL internally.
// Since 64-bit ineteger conversion functions are
// not part of the ANSI C++ standard, the code
// below is compiler specific
#if (_MSC_VER >= 1400) // VC++ 8.0 or higher
#define OTL_BIGINT_TO_STR(n,str)                \
{                                               \
  _i64toa_s(n,str,sizeof(str),10);              \
}
#else
#define OTL_BIGINT_TO_STR(n,str)                \
{                                               \
  _i64toa(n,str,10);                            \
}
#endif

#elif defined(__GNUC__) // GNU C++

#include <stdlib.h>

// Enabling support for 64-bit signed integers
// Since 64-bit integers are not part of the ANSI C++
// standard, this definition is compiler specific.
#define OTL_BIGINT long long

const OTL_BIGINT BIGINT_VAL1=12345678901234000LL;

// Defining a string-to-bigint conversion 
// that is used by OTL internally.
// Since 64-bit ineteger conversion functions are
// not part of the ANSI C++ standard, the code
// below is compiler specific.
#define OTL_STR_TO_BIGINT(str,n)                \
{                                               \
  n=strtoll(str,0,10);                          \
}

// Defining a bigint-to-string conversion 
// that is used by OTL internally.
// Since 64-bit ineteger conversion functions are
// not part of the ANSI C++ standard, the code
// below is compiler specific
#define OTL_BIGINT_TO_STR(n,str)                \
{                                               \
  sprintf(str,"%lld",n);                        \
}


#endif

#include <otlv4.h> // include the OTL 4.0 header file

otl_connect db; // connect object

void insert()
// insert rows into table
{ 
 otl_stream o(50, // buffer size
              "insert into test_tab values(:f1<bigint>,:f2<char[31]>)", 
                 // SQL statement
              db // connect object
             );
 char tmp[32];

 for(OTL_BIGINT i=BIGINT_VAL1;i<=BIGINT_VAL1+100;++i){
  int ndx=static_cast<int>(i-BIGINT_VAL1);
#if defined(_MSC_VER)
#if (_MSC_VER >= 1400) // VC++ 8.0 or higher
  sprintf_s(tmp,sizeof(tmp),"Name%d",ndx);
#else
  sprintf(tmp,"Name%d",ndx);
#endif
#else
  sprintf(tmp,"Name%d",ndx);
#endif
  o<<i<<tmp;
 }
}

void select()
{ 
 otl_stream i(50, // buffer size
              "select f1 :#1<bigint>, f2 "
                // the default mapping of f1 needs to be overriden 
                // explicitly when bigint's are used in a combination
                // OTL/OCIx, because the default mapping maps
                // Oracle NUMBERs into double containers, which are not 
                // big enough to hold 64-bit signed integer values.
              "from test_tab "
              "where f1>=:f<bigint> "
              "  and f1<=:ff<bigint>",
                 // SELECT statement
              db // connect object
             ); 
   // create select stream
 
 OTL_BIGINT f1;
 char f2[31];
#if defined(_MSC_VER)
 char f1str[40];
#endif

 i<<BIGINT_VAL1+8
  <<BIGINT_VAL1+16; // assigning :f = 8; :ff = 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=";
#if defined(_MSC_VER)
#if (_MSC_VER >= 1400) // VC++ 8.0 or higher
  _i64toa_s(f1,f1str,sizeof(f1str),10);
#else
  _i64toa(f1,f1str,10);
#endif
  cout<<f1str<<", f2="<<f2<<endl;
#elif defined(__GNUC__)
  cout<<f1<<", f2="<<f2<<endl;
#endif
 }

}

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;

}