#include<CSql.h>int main(){    Connection conn;    DbRetVal rv = OK;    //check whether connection open fails for non existing user    rv = conn.open("user1", "passwd");    if (rv == OK) return 1;    //open with dba to create new user    rv = conn.open("praba", "manager");    if (rv != OK) return 2;    UserManager *uMgr = conn.getUserManager();    uMgr->createUser("user1", "passwd");    rv = conn.close();    if (rv != OK) return 3;    //check whether the newly created user name works    rv = conn.open("user1", "passwd");    if (rv != OK) return 4;    rv = conn.close();    if (rv != OK) return 5;    //check whether the newly created user name fails if     //wrong password is passed    rv = conn.open("user1", "wrongpasswd");    if (rv == OK) return 6;    //open with dba to delete the newly created user    rv = conn.open("praba", "manager");    if (rv != OK) return 7;    uMgr = conn.getUserManager();    uMgr->deleteUser("user1");    rv = conn.close();    if (rv != OK) return 8;    //check whether it is deleted by connecting with that user    //name and password. It should fail    rv = conn.open("user1", "passwd");    if (rv == OK) return 9;    return 0;}