OTL 4.0, Example 665 (XML as varchar_long/otl_long_string on SELECT, and as varchar_long/otl_long_string

 on INSERT)

This example demonstrates simple INSERT and SELECT statements with the XML datatype as well as constant SQL statements. XML columns can be bound with varchar_long variables on INSERT/UPDATE/DELETE. On SELECT, XML gets bound to varchar_long by default.

Source Code

#include <iostream>
using namespace std;

#include <stdio.h>
#define OTL_ODBC_MSSQL_2008 // Compile OTL 4/ODBC, MS SQL 2008
#include <otlv4.h> // include the OTL 4.0 header file

otl_connect db; // connect object

void insert()
// insert rows into table
{
db.set_max_long_size(80000); // set maximum long string size for connect object
otl_stream o(10, // buffer size
"insert into test_tab values(:f1<int>,:f2<varchar_long>) ",
// SQL statement
db // connect object
);
char tmp[80001];

for(int i=1;i<=20;++i){
sprintf(tmp,"<TAG>MyXML%d</TAG>",i);
int len=(int)strlen(tmp);
otl_long_string f2(tmp,len,len); // define long string variable
o<<i<<f2;
}

}

void select()
{
otl_long_string f2(80000); // define long string variable
db.set_max_long_size(80000); // set maximum long string size for connect object

otl_stream i(10, // buffer size
"select f1, f2 "
"from test_tab "
"where f1>=:f11<int> "
" and f1<=:f12<int>*2",
// SELECT statement
db // connect object
);
// create select stream

int 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="<<(char*)&f2[0]<<endl;
}

}

int main()
{
otl_connect::otl_initialize(); // initialize ODBC environment
try{

db.rlogon("scott/tiger@mssql2008"); // connect to MS SQL

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 xml)"
); // 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 MS SQL

return 0;

}

Output

f1=8, f2=<TAG>MyXML8</TAG>
f1=9, f2=<TAG>MyXML9</TAG>
f1=10, f2=<TAG>MyXML10</TAG>
f1=11, f2=<TAG>MyXML11</TAG>
f1=12, f2=<TAG>MyXML12</TAG>
f1=13, f2=<TAG>MyXML13</TAG>
f1=14, f2=<TAG>MyXML14</TAG>
f1=15, f2=<TAG>MyXML15</TAG>
f1=16, f2=<TAG>MyXML16</TAG>

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

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