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# dbx_query

(PHP 4 >= 4.0.6)

dbx_query -- Send a query and fetch all results (if any)

## Description

object dbx_query ( object link_identifier, string sql_statement [, long flags])

dbx_query() returns an object or `1` on success, and `0` on failure. The result object is returned only if the query given in `sql_statement` produces a result set.

Example 1. How to handle the returned value
    <?php
    $link   = dbx_connect(DBX_ODBC, "", "db", "username", "password")
        or die("Could not connect");

    $result = dbx_query($link, 'SELECT id, parentid, description FROM table');

    if ( is_object($result) ) {
        // ... do some stuff here, see detailed examples below ...
        // first, print out field names and types
        // then, draw a table filled with the returned field values
    }
    else if ( $result == 1 ) {
        echo("Query executed successfully, but no result set returned");
    }
    else {
        exit("Query failed");
    }

    dbx_close($link);
    ?>

The `flags` parameter is used to control the amount of information that is returned. It may be any combination of the following constants with the bitwise OR operator (|). The DBX_COLNAMES_* flags override the dbx.colnames_case setting from `php.ini`.

`DBX_RESULT_INDEX`

  It is always set, that is, the returned object has a data property which is a 2 dimensional array indexed numerically. For example, in the expression `data[2][3]` `2` stands for the row (or record) number and `3` stands for the column (or field) number. The first row and column are indexed at 0.

  If `DBX_RESULT_ASSOC` is also specified, the returning object contains the information related to `DBX_RESULT_INFO` too, even if it was not specified.

`DBX_RESULT_INFO`

  It provides info about columns, such as field names and field types.

`DBX_RESULT_ASSOC`

  It effects that the field values can be accessed with the respective column names used as keys to the returned object's data property.

  Associated results are actually references to the numerically indexed data, so modifying `data[0][0]` causes that `data[0]['field_name_for_first_column']` is modified as well.

`DBX_COLNAMES_UNCHANGED` (CVS only)

  The case of the returned column names will not be changed.

`DBX_COLNAMES_UPPERCASE` (CVS only)

  The case of the returned column names will be changed to uppercase.

`DBX_COLNAMES_LOWERCASE` (CVS only)

  The case of the returned column names will be changed to lowercase.

Note that `DBX_RESULT_INDEX` is always used, regardless of the actual value of `flags` parameter. This means that the following combinations is effective only:

- `DBX_RESULT_INDEX`

- `DBX_RESULT_INDEX` | `DBX_RESULT_INFO`

- `DBX_RESULT_INDEX` | `DBX_RESULT_INFO` | `DBX_RESULT_ASSOC` - this is the default, if `flags` is not specified.

The returing `object` has four or five properties depending on `flags`:

handle

  It is a valid handle for the connected database, and as such it can be used in module specific functions (if required).

      $result = dbx_query ($link, "SELECT id FROM table");
      mysql_field_len ($result->handle, 0);

cols and rows

  These contain the number of columns (or fields) and rows (or records) respectively.

      $result = dbx_query ($link, 'SELECT id FROM table');
      echo $result->rows; // number of records
      echo $result->cols; // number of fields

info (optional)

  It is returned only if either `DBX_RESULT_INFO` or `DBX_RESULT_ASSOC` is specified in the `flags` parameter. It is a 2 dimensional array, that has two named rows (`name` and `type`) to retrieve column information.

  Example 2. lists each field's name and type
      $result = dbx_query ($link, 'SELECT id FROM table',
                           DBX_RESULT_INDEX | DBX_RESULT_INFO);

      for ($i = 0; $i < $result->cols; $i++ ) {
          echo $result->info['name'][$i] . "\n";
          echo $result->info['type'][$i] . "\n";
      }

data

  This property contains the actual resulting data, possibly associated with column names as well depending on `flags`. If `DBX_RESULT_ASSOC` is set, it is possible to use `$result->data[2]["field_name"]`.

  Example 3. outputs the content of data property into HTML table
      $result = dbx_query ($link, 'SELECT id, parentid, description FROM table');

      echo "<table>\n";
      foreach ( $result->data as $row ) {
          echo "<tr>\n";
          foreach ( $row as $field ) {
              echo "<td>$field</td>";
          }
          echo "</tr>\n";
      }
      echo "</table>\n";

> Note: Always refer to the module-specific documentation as well.

> Column names for queries on an Oracle database are returned in lowercase.

See also: dbx_escape_string() and dbx_connect().

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