OTL 4.0, Example 760 (VARCHAR2 as JSON table column)

Example 760 (VARCHAR2 as JSON table)


This code example shows how to use OTL with a VARCHAR2 table column that has "IS JSON" constraint. It's not really that different from any other VARCHAR2 column. See the Oracle manual for more detail on how JSON columns can be selected from the underlying table.

Source Code

#include <iostream>
#include <string>
using namespace std;
#define OTL_ORA12C // Compile OTL 4.0/OCI12
#define OTL_STL // Enable STL compatibility mode
#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 {
 string f2; 
otl_stream o(3,
"insert into test_tab values(:f1<int>,:f2<char[4001]>)",
// SQL statement
db // connect object
);

string json_str(json_sample);

o<<1<<json_str;
o<<2<<json_str;
} void select() {  string f2;

otl_stream i(3,
"select * from test_tab where f1>=:f<int> and f1<=:f*2",
// SELECT statement
db // connect object
);
// create select stream

int f1;

i<<1; // assigning :f = 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 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(4000), check(f2 is 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 Oracle  return 0; }

Output

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 } ] }
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