OTL 4.0, Example 746 (OTL_ORA_CUSTOM_MAP_NUMBER_ON_SELECT)

This example demonstrates #define OTL_ORA_CUSTOM_MAP_NUMBER_ON_SELECT with a simple SELECT statement.

Source Code

#include <iostream>
using namespace std;

#include <stdio.h>
#define OTL_ORA8 // Compile OTL 4.0/OCI8

// This #define overrides the default (any NUMBER to double) numeric data type
// mapping on SELECT statements / reference cursors.
// This #define maps NUMBER(X) (X in [1..4]) to short int, NUMBER(Y)
// (Y in [5..10]) to int, any other NUMBER to double.
#define OTL_ORA_CUSTOM_MAP_NUMBER_ON_SELECT(ftype,elem_size,desc)      \ { \
if(ftype==extFloat && desc.prec>=5 && desc.prec<=10 && desc.scale==0){ \
ftype=otl_var_int; \
elem_size=sizeof(int); \
}else if(ftype==extFloat && desc.prec>=1 && desc.prec<=4 && desc.scale==0){ \
ftype=otl_var_short; \
elem_size=sizeof(short int); \
}else{ \
ftype=otl_var_double; \
elem_size=sizeof(double); \
} \
}
#include <otlv4.h> // include the OTL 4.0 header file otl_connect db; // connect object void select() { otl_stream i(1, // buffer size "select * from test_tab where f1>=:f<int> and f1<=:f*2", // SELECT statement db // connect object ); // create select stream otl_column_desc* desc; int desc_len; desc=i.describe_select(desc_len); for(int n=0;n<desc_len;++n){ cout<<"========== COLUMN #"<<n+1<<" ==========="<<endl; cout<<"name="<<desc[n].name<<endl; cout<<"dbtype="<<desc[n].dbtype<<endl; cout<<"otl_var_dbtype="<<desc[n].otl_var_dbtype<<endl; cout<<"dbsize="<<desc[n].dbsize<<endl; cout<<"scale="<<desc[n].scale<<endl; cout<<"prec="<<desc[n].prec<<endl; cout<<"nullok="<<desc[n].nullok<<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 number(4), f3 number(10))" ); // create 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

========== COLUMN #1 ===========
name=F1
dbtype=2
otl_var_dbtype=2
dbsize=22
scale=129
prec=0
nullok=1
========== COLUMN #2 ===========
name=F2
dbtype=2
otl_var_dbtype=6
dbsize=22
scale=0
prec=4
nullok=1
========== COLUMN #3 ===========
name=F3
dbtype=2
otl_var_dbtype=4
dbsize=22
scale=0
prec=10
nullok=1

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Copyright © 1996-2017, Sergei Kuchin, email: skuchin@gmail.com, skuchin@gmail.com .

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