LWT Using Basic Example from DataStax C/C++ Driver

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#include <assert.h>
#include <inttypes.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>

#include "cassandra.h"

struct Basic_ {
  cass_bool_t bln;
  cass_float_t flt;
  cass_double_t dbl;
  cass_int32_t i32;
  cass_int64_t i64;
};

typedef struct Basic_ Basic;

void print_error(CassFuture* future) {
  const char* message;
  size_t message_length;
  cass_future_error_message(future, &message, &message_length);
  fprintf(stderr, "Error: %.*s\n", (int)message_length, message);
}

CassCluster* create_cluster(const char* hosts) {
  CassCluster* cluster = cass_cluster_new();
  cass_cluster_set_contact_points(cluster, hosts);
  return cluster;
}

CassError connect_session(CassSession* session, const CassCluster* cluster) {
  CassError rc = CASS_OK;
  CassFuture* future = cass_session_connect(session, cluster);

  cass_future_wait(future);
  rc = cass_future_error_code(future);
  if (rc != CASS_OK) {
    print_error(future);
  }
  cass_future_free(future);

  return rc;
}

CassError execute_query(CassSession* session, const char* query) {
  CassError rc = CASS_OK;
  CassFuture* future = NULL;
  CassStatement* statement = cass_statement_new(query, 0);

  future = cass_session_execute(session, statement);
  cass_future_wait(future);

  rc = cass_future_error_code(future);
  if (rc != CASS_OK) {
    print_error(future);
  }

  cass_future_free(future);
  cass_statement_free(statement);

  return rc;
}

CassError insert_into_basic(CassSession* session, const char* key, const Basic* basic) {
  CassError rc = CASS_OK;
  CassStatement* statement = NULL;
  CassFuture* future = NULL;
  const char* query = "INSERT INTO examples.basic (key, bln, flt, dbl, i32, i64) VALUES (?, ?, ?, ?, ?, ?);";

  statement = cass_statement_new(query, 6);

  cass_statement_bind_string(statement, 0, key);
  cass_statement_bind_bool(statement, 1, basic->bln);
  cass_statement_bind_float(statement, 2, basic->flt);
  cass_statement_bind_double(statement, 3, basic->dbl);
  cass_statement_bind_int32(statement, 4, basic->i32);
  cass_statement_bind_int64(statement, 5, basic->i64);

  future = cass_session_execute(session, statement);
  cass_future_wait(future);

  rc = cass_future_error_code(future);
  if (rc != CASS_OK) {
    print_error(future);
  }

  cass_future_free(future);
  cass_statement_free(statement);

  return rc;
}

CassError select_from_basic(CassSession* session, const char* key, Basic* basic) {
  CassError rc = CASS_OK;
  CassStatement* statement = NULL;
  CassFuture* future = NULL;
  const char* query = "SELECT * FROM examples.basic WHERE key = ?";

  statement = cass_statement_new(query, 1);

  cass_statement_bind_string(statement, 0, key);

  future = cass_session_execute(session, statement);
  cass_future_wait(future);

  rc = cass_future_error_code(future);
  if (rc != CASS_OK) {
    print_error(future);
  } else {
    const CassResult* result = cass_future_get_result(future);
    CassIterator* iterator = cass_iterator_from_result(result);

    if (cass_iterator_next(iterator)) {
      const CassRow* row = cass_iterator_get_row(iterator);
      cass_value_get_bool(cass_row_get_column(row, 1), &basic->bln);
      cass_value_get_double(cass_row_get_column(row, 2), &basic->dbl);
      cass_value_get_float(cass_row_get_column(row, 3), &basic->flt);
      cass_value_get_int32(cass_row_get_column(row, 4), &basic->i32);
      cass_value_get_int64(cass_row_get_column(row, 5), &basic->i64);
    }

    cass_result_free(result);
    cass_iterator_free(iterator);
  }

  cass_future_free(future);
  cass_statement_free(statement);

  return rc;
}

CassError update_into_basic(CassSession* session, const char* key, cass_double_t update_dbl, cass_int64_t only_if_i64) {
  CassError rc = CASS_OK;
  CassStatement* statement = NULL;
  CassFuture* future = NULL;
  const char* query = "UPDATE examples.basic SET dbl=? WHERE key = ? IF i64=?";

  statement = cass_statement_new(query, 3);

  cass_statement_bind_double(statement, 0, update_dbl);
  cass_statement_bind_string(statement, 1, key);
  cass_statement_bind_int64(statement, 2, only_if_i64);

  future = cass_session_execute(session, statement);
  cass_future_wait(future);

  rc = cass_future_error_code(future);
  if (rc != CASS_OK) {
    print_error(future);
  } else {
    const CassResult* result = cass_future_get_result(future);
    CassIterator* iterator = cass_iterator_from_result(result);

    if (cass_iterator_next(iterator)) {
      const CassRow* row = cass_iterator_get_row(iterator);
      const char* column_name = NULL;
      size_t column_name_length = 0;
      cass_bool_t bln = cass_false;

      printf("Column count: %lu\n", cass_result_column_count(result));
      cass_result_column_name(result, 0, &column_name, &column_name_length);
      cass_value_get_bool(cass_row_get_column(row, 0), &bln);
      printf("%.*s: %s\n", (int) column_name_length, column_name,
                           (bln == cass_true ? "true" : "false"));
      if (bln == cass_false) {
        cass_int64_t cause = 0;

        cass_result_column_name(result, 1, &column_name, &column_name_length);
        cass_value_get_int64(cass_row_get_column(row, 1), &cause);
        printf("%.*s: %"PRId64"\n", (int) column_name_length, column_name,
                                    cause);
      }
      printf("\n");
    }

    cass_result_free(result);
    cass_iterator_free(iterator);
  }

  cass_future_free(future);
  cass_statement_free(statement);

  return rc;
}

int main(int argc, char* argv[]) {
  CassCluster* cluster = NULL;
  CassSession* session = cass_session_new();
  CassFuture* close_future = NULL;
  char* hosts = "127.0.0.1";

  Basic input = { cass_true, 0.001f, 0.0002, 1, 2 };
  Basic output;

  if (argc > 1) {
    hosts = argv[1];
  }
  cluster = create_cluster(hosts);

  if (connect_session(session, cluster) != CASS_OK) {
    cass_cluster_free(cluster);
    cass_session_free(session);
    return -1;
  }

  execute_query(session,
                "CREATE KEYSPACE examples WITH replication = { \
                           'class': 'SimpleStrategy', 'replication_factor': '3' };");


  execute_query(session,
                "CREATE TABLE examples.basic (key text, \
                                              bln boolean, \
                                              flt float, dbl double,\
                                              i32 int, i64 bigint, \
                                              PRIMARY KEY (key));");

  insert_into_basic(session, "test", &input);
  select_from_basic(session, "test", &output);

  assert(input.bln == output.bln);
  assert(input.flt == output.flt);
  assert(input.dbl == output.dbl);
  assert(input.i32 == output.i32);
  assert(input.i64 == output.i64);

  update_into_basic(session, "test", 0.0003, 2);
  update_into_basic(session, "test", 0.0004, 2);
  update_into_basic(session, "test", 0.0005, 3);
  select_from_basic(session, "test", &output);

  assert(input.bln == output.bln);
  assert(input.flt == output.flt);
  assert(0.0004 == output.dbl);
  assert(input.i32 == output.i32);
  assert(input.i64 == output.i64);

  close_future = cass_session_close(session);
  cass_future_wait(close_future);
  cass_future_free(close_future);

  cass_cluster_free(cluster);
  cass_session_free(session);

  return 0;
}