This example demonstrates simple INSERT and SELECT statements
with the PostgreSQL 9.3 (and higher) JSON datatype as well as
constant SQL statements. JSON columns can be bound with
varchar_long variables on INSERT/UPDATE/DELETE.
#include <iostream>
#include <string>
using namespace std;
#include <stdio.h>
// #define OTL_ODBC_UNIX // uncomment this line if UnixODBC is used
#define OTL_ODBC_ALTERNATE_RPC
#if !defined(_WIN32) && !defined(_WIN64)
#define OTL_ODBC
#else
#define OTL_ODBC_POSTGRESQL // required with PG ODBC on Windows
#endif
#define OTL_STL
#include <otlv4.h> // include the OTL 4.0 header file
otl_connect db; // connect object
const char* json_sample=
"{ \"PONumber\" : 1600,"
" \"Reference\" : \"ABULL-20140421\","
" \"Requestor\" : \"Alexis Bull\","
" \"User\" : \"ABULL\","
" \"CostCenter\" : \"A50\","
" \"ShippingInstructions\" : { \"name\" : \"Alexis Bull\","
" \"Address\": { \"street\" : \"200 Sporting Green\","
" \"city\" : \"South San Francisco\","
" \"state\" : \"CA\","
" \"zipCode\" : 99236,"
" \"country\" : \"United States of America\" },"
" \"Phone\" : [ { \"type\" : \"Office\", \"number\" : \"909-555-7307\" },"
" { \"type\" : \"Mobile\", \"number\" : \"415-555-1234\" } ] },"
" \"Special Instructions\" : null,"
" \"AllowPartialShipment\" : false,"
" \"LineItems\" : [ { \"ItemNumber\" : 1,"
" \"Part\" : { \"Description\" : \"One Magic Christmas\","
" \"UnitPrice\" : 19.95,"
" \"UPCCode\" : 13131092899 },"
" \"Quantity\" : 9.0 },"
" { \"ItemNumber\" : 2,"
" \"Part\" : { \"Description\" : \"Lethal Weapon\","
" \"UnitPrice\" : 19.95,"
" \"UPCCode\" : 85391628927 },"
" \"Quantity\" : 5.0 } ] }";
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
);
string json_str(json_sample);
o<<1<<json_str;
o<<2<<json_str;
}
void select()
{
string f2;
db.set_max_long_size(80000); // set maximum long string size for connect object
otl_stream i(10, // buffer size
"select f1, f2 :#2<varchar_long> "
"from test_tab "
"where f1>=:f11<int> "
" and f1<=:f12<int>*2",
// SELECT statement
db // connect object
);
// create select stream
int f1;
i<<1<<1; // assigning :f11 = 1, :f12 = 1
// 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;
cout<<"======================================================"<<endl;
}
}
int main()
{
otl_connect::otl_initialize(); // initialize ODBC environment
try{
db.rlogon("scott/tiger@postgresql"); // 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 json)"
); // 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 the database
return 0;
}
f1=1, f2={ "PONumber" : 1600, "Reference" : "ABULL-20140421", "Requestor" : "Alexis Bull", "User" : "ABULL", "CostCenter" : "A50", "ShippingInstructions" : { "name" : "Alexis Bull", "Address": { "street" : "200 Sporting Green", "city" : "South San Francisco", "state" : "CA", "zipCode" : 99236, "country" : "United States of America" }, "Phone" : [ { "type" : "Office", "number" : "909-555-7307" }, { "type" : "Mobile", "number" : "415-555-1234" } ] }, "Special Instructions" : null, "AllowPartialShipment" : false, "LineItems" : [ { "ItemNumber" : 1, "Part" : { "Description" : "One Magic Christmas", "UnitPrice" : 19.95, "UPCCode" : 13131092899 }, "Quantity" : 9.0 }, { "ItemNumber" : 2, "Part" : { "Description" : "Lethal Weapon", "UnitPrice" : 19.95, "UPCCode" : 85391628927 }, "Quantity" : 5.0 } ] }
======================================================
f1=2, f2={ "PONumber" : 1600, "Reference" : "ABULL-20140421", "Requestor" : "Alexis Bull", "User" : "ABULL", "CostCenter" : "A50", "ShippingInstructions" : { "name" : "Alexis Bull", "Address": { "street" : "200 Sporting Green", "city" : "South San Francisco", "state" : "CA", "zipCode" : 99236, "country" : "United States of America" }, "Phone" : [ { "type" : "Office", "number" : "909-555-7307" }, { "type" : "Mobile", "number" : "415-555-1234" } ] }, "Special Instructions" : null, "AllowPartialShipment" : false, "LineItems" : [ { "ItemNumber" : 1, "Part" : { "Description" : "One Magic Christmas", "UnitPrice" : 19.95, "UPCCode" : 13131092899 }, "Quantity" : 9.0 }, { "ItemNumber" : 2, "Part" : { "Description" : "Lethal Weapon", "UnitPrice" : 19.95, "UPCCode" : 85391628927 }, "Quantity" : 5.0 } ] }
======================================================
Copyright © 1996-2024, Sergei Kuchin, email: skuchin@gmail.com, skuchin@gmail.com .
Permission to use, copy, modify and redistribute this document for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.