OTL 4.0, Constant SQL statements

Constant SQL statements

A SQL statement / PL/SQL block / stored procedure call is considered to be constant if it does not have any bind variables. OTL 4.0 has a static (in class) function to execute constant statements.

Examples

// static otl_cursor::direct_exec()

  otl_cursor::direct_exec
   (db, // connect object
    "create table test_tab(f1 int, f2 varchar(30))"
    );  // create table
  otl_cursor::direct_exec
   (db, // connect object
    "drop table test_tab", // SQL statement or PL/SQL block
    otl_exception::disabled // disable OTL exceptions,
                            // in other words, ignore any
                            // database error
   ); // drop table

// or otl_connect::direct_exec()

  db.direct_exec // connect object  
("create table test_tab(f1 int, f2 varchar(30))"
   );  // create table

  db.direct_exec // connect object  
    ("drop table test_tab", // SQL statement or PL/SQL block
    otl_exception::disabled // disable OTL exceptions,
                            // in other words, ignore any
                            // database error
   ); // drop table


// or otl_connect::operator<<(const char*)

  db<<"create table test_tab(f1 number, f2 varchar2(30))";
try{
db<<"drop table test_tab""; // SQL statement or PL/SQL block
}catch(otl_exception&){
// ignore a database error
}

otl_cursor is one of the OTL 4.0 internal classes. It is not recommended to use the OTL 4.0 low level classes and functions except for the direct_exec() because it is a special case and it will not be discontinued in the future releases of the OTL.

The direct_exec() function may return the following values of the long int datatype:

Here is an example of the direct_exec(), returning a row processed count:

// static otl_cursor::direct_exec

  long rpc=otl_cursor::direct_exec
            (db, // connect object
             "delete from test_tab where f1>=95"
            ); 

  cout<<"Rows deleted: "<<rpc<<endl;

// or otl_connect:direct_exec

  long rpc=db.direct_exec // connect object
            ("delete from test_tab where f1>=95"
            ); 

  cout<<"Rows deleted: "<<rpc<<endl;



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