OTL 4.0, Example 452 (Simple Insert/Select with VARBINARY)

This example demonstrates simple INSERT and SELECT statements with the VARBINARY datatype as well as constant SQL statements.

Source Code

#include <iostream>
using namespace std;

#include <stdio.h>
#define OTL_ODBC // Compile OTL 4.0/ODBC
// The following #define is required with MyODBC 3.51.11 and higher
#define OTL_ODBC_SELECT_STM_EXECUTE_BEFORE_DESCRIBE
#include <otlv4.h> // include the OTL 4.0 header file

otl_connect db; // connect object

void insert()
// insert rows into table
{
 otl_long_string f2(700); // define long string variable
otl_stream o(1, // buffer size still has to be set to 1 on INSERT
"insert into test_tab values "
"(:f1<int>,:f2<raw[700]>), "
"(:f12<int>,:f22<raw[700]>), "
"(:f13<int>,:f23<raw[700]>), "
"(:f14<int>,:f24<raw[700]>), "
"(:f15<int>,:f25<raw[700]>) ",
// INSERT statement. Multiple sets of values can be used
// to work around the lack of the bulk interface
db // connect object
);
for(int i=1;i<=20;++i){
for(int j=0;j<699;++j)
f2[j]='*';
f2[699]='?';
f2.set_len(700);
o<<i<<f2;
}

}

void select()
{
otl_long_string f2(700); // define long string variable
otl_stream i(10, // buffer size
"select f1, "
// MyODBC does not return SQL_VARBINARY, so the output column type
// has to be overriden explicitly
" f2 :#2<raw[700]> "
"from test_tab "
"where f1>=:f11<int> and f1<=:f12<int>*2",
// SELECT statement
db // connect object
);
// create select stream

float f1;

i<<8<<8; // assigning :f11 = 8, :f12 = 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[0]<<f2[f2.len()-1]<<", len="<<f2.len()<<endl;
}

i<<4<<4; // assigning :f11 = 4, :f12 = 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[0]<<f2[f2.len()-1]<<", len="<<f2.len()<<endl;
}

}

int main()
{
otl_connect::otl_initialize(); // initialize the database API environment
try{

db.rlogon("scott/tiger@mysql35"); // connect to the database

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 int, f2 varbinary(700)) type=innoDB"
); // 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.sqlstate<<endl; // print out SQLSTATE
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 the database

return 0;

}

Output

f1=8, f2=*?, len=700
f1=9, f2=*?, len=700
f1=10, f2=*?, len=700
f1=11, f2=*?, len=700
f1=12, f2=*?, len=700
f1=13, f2=*?, len=700
f1=14, f2=*?, len=700
f1=15, f2=*?, len=700
f1=16, f2=*?, len=700
f1=4, f2=*?, len=700
f1=5, f2=*?, len=700
f1=6, f2=*?, len=700
f1=7, f2=*?, len=700
f1=8, f2=*?, len=700

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

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