# db2_fetch_row

(PECL ibm_db2 >= 1.0.0)

db2_fetch_row — Sets the result set pointer to the next row or requested row

### 说明

db2_fetch_row ( resource `$stmt` [, int `$row_number` ] ) : bool

Use db2_fetch_row() to iterate through a result set, or to point to a specific row in a result set if you requested a scrollable cursor.

To retrieve individual fields from the result set, call the db2_result() function.

Rather than calling db2_fetch_row() and db2_result(), most applications will call one of db2_fetch_assoc(), db2_fetch_both(), or db2_fetch_array() to advance the result set pointer and return a complete row as an array.

### 参数

`stmt`

  A valid stmt resource.

`row_number`

  With scrollable cursors, you can request a specific row number in the result set. Row numbering is 1-indexed.

### 返回值

Returns `TRUE` if the requested row exists in the result set. Returns `FALSE` if the requested row does not exist in the result set.

### 范例

Example #1 Iterating through a result set

The following example demonstrates how to iterate through a result set with db2_fetch_row() and retrieve columns from the result set with db2_result().

    <?php
    $sql = 'SELECT name, breed FROM animals WHERE weight < ?';
    $stmt = db2_prepare($conn, $sql);
    db2_execute($stmt, array(10));
    while (db2_fetch_row($stmt)) {
        $name = db2_result($stmt, 0);
        $breed = db2_result($stmt, 1);
        print "$name $breed";
    }
    ?>

以上例程会输出：

    cat Pook
    gold fish Bubbles
    budgerigar Gizmo
    goat Rickety Ride

Example #2 i5/OS recommended alternatives to db2_fetch_row/db2_result

On i5/OS it is recommended that you use db2_fetch_both(), db2_fetch_array(), or db2_fetch_object() over db2_fetch_row()/db2_result(). In general db2_fetch_row()/db2_result() have more issues with various column types in EBCIDIC to ASCII translation, including possible truncation in DBCS applications. You may also find the performance of db2_fetch_both(), db2_fetch_array(), and db2_fetch_object() to be superior to db2_fetch_row()/db2_result().

    <?php
      $conn = db2_connect("","","");
      $sql = 'SELECT SPECIFIC_SCHEMA, SPECIFIC_NAME, ROUTINE_SCHEMA, ROUTINE_NAME, ROUTINE_TYPE, ROUTINE_CREATED, ROUTINE_BODY, IN_PARMS, OUT_PARMS, INOUT_PARMS, PARAMETER_STYLE, EXTERNAL_NAME, EXTERNAL_LANGUAGE FROM QSYS2.SYSROUTINES FETCH FIRST 2 ROWS ONLY';
      $stmt = db2_exec($conn, $sql, array('cursor' => DB2_SCROLLABLE));
      while ($row = db2_fetch_both($stmt)){
        echo "<br>db2_fetch_both {$row['SPECIFIC_NAME']} {$row['ROUTINE_CREATED']} {$row[5]}";
      }
      $stmt = db2_exec($conn, $sql, array('cursor' => DB2_SCROLLABLE));
      while ($row = db2_fetch_array($stmt)){
        echo "<br>db2_fetch_array {$row[1]}  {$row[5]}";
      }
      $stmt = db2_exec($conn, $sql, array('cursor' => DB2_SCROLLABLE));
      while ($row = db2_fetch_object($stmt)){
        echo "<br>db2_fetch_object {$row->SPECIFIC_NAME} {$row->ROUTINE_CREATED}";
      }
      db2_close($conn);
    ?>

以上例程会输出：

    db2_fetch_both MATCH_ANIMAL 2006-08-25-17.10.23.775000 2006-08-25-17.10.23.775000
    db2_fetch_both MULTIRESULTS 2006-10-17-10.11.05.308000 2006-10-17-10.11.05.308000
    db2_fetch_array MATCH_ANIMAL 2006-08-25-17.10.23.775000
    db2_fetch_array MULTIRESULTS 2006-10-17-10.11.05.308000
    db2_fetch_object MATCH_ANIMAL 2006-08-25-17.10.23.775000
    db2_fetch_object MULTIRESULTS 2006-10-17-10.11.05.308000

### 参见

- db2_fetch_array() - Returns an array, indexed by column position, representing a row in a result set
- db2_fetch_assoc() - Returns an array, indexed by column name, representing a row in a result set
- db2_fetch_both() - Returns an array, indexed by both column name and position, representing a row in a result set
- db2_fetch_object() - Returns an object with properties representing columns in the fetched row
- db2_result() - Returns a single column from a row in the result set