db2_fetch_both

(PECL ibm_db2 >= 1.0.0)

db2_fetch_both — Returns an array, indexed by both column name and position, representing a row in a result set

Descrizione

db2_fetch_both(resource $stmt, int $row_number = -1): array|false

Returns an array, indexed by both column name and position, representing a row in a result set. Note that the row returned by db2_fetch_both() requires more memory than the single-indexed arrays returned by db2_fetch_assoc() or db2_fetch_array().

Elenco dei parametri

stmt: A valid stmt resource containing a result set.
row_number: Requests a specific 1-indexed row from the result set. Passing this parameter results in a PHP warning if the result set uses a forward-only cursor.

Valori restituiti

Returns an associative array with column values indexed by both the column name and 0-indexed column number. The array represents the next or requested row in the result set. Returns false if there are no rows left in the result set, or if the row requested by row_number does not exist in the result set.

Esempi

Example #1 Iterating through a forward-only cursor

If you call db2_fetch_both() without a specific row number, it automatically retrieves the next row in the result set. The following example accesses columns in the returned array by both column name and by numeric index.

<?php

$sql = "SELECT id, name, breed, weight FROM animals ORDER BY breed";
$stmt = db2_prepare($conn, $sql);
$result = db2_execute($stmt);

while ($row = db2_fetch_both($stmt)) {
    printf ("%-5d %-16s %-32s %10s\n", 
        $row['ID'], $row[0], $row['BREED'], $row[3]);
}
?>

Il precedente esempio visualizzerà:

0     Pook             cat                                    3.20
5     Rickety Ride     goat                                   9.70
2     Smarty           horse                                350.00

Example #2 Retrieving specific rows with db2_fetch_both() from a scrollable cursor

If your result set uses a scrollable cursor, you can call db2_fetch_both() with a specific row number. The following example retrieves every other row in the result set, starting with the second row.

<?php

$sql = "SELECT id, name, breed, weight FROM animals ORDER BY breed";
$result = db2_exec($stmt, $sql, array('cursor' => DB2_SCROLLABLE));

$i=2;
while ($row = db2_fetch_both($result, $i)) {
    printf ("%-5d %-16s %-32s %10s\n", 
        $row[0], $row['NAME'], $row[2], $row['WEIGHT']);
    $i = $i + 2;
}
?>

Il precedente esempio visualizzerà:

0     Pook             cat                                    3.20
5     Rickety Ride     goat                                   9.70
2     Smarty           horse                                350.00

Vedere anche:

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_object() - Returns an object with properties representing columns in the fetched row
db2_fetch_row() - Sets the result set pointer to the next row or requested row
db2_result() - Returns a single column from a row in the result set

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User Contributed Notes 1 note

down

eacosta at openware dot biz ¶

16 years ago

Hello,

Some weeks ago I faced difficulties with walk a big number of 
records from a result set.

I was using the function db2_fetch_both in a method of a database adapter
class to retrieve just one record at a time. The total number of records
were: 5647 and when I reach record number 1600 the function crashed
generating the below message in "Actual result" field.

I am copying table's description next:

TMP_TABLE
-----------------------------------------------------------------
| ID        | TYPE        | SIZE        | NULL        |
-----------------------------------------------------------------
| ID        | INTEGER    | 4        | NO        |
| SERVICE    | VARCHAR    | 30        | NO        |
| ID_v        | VARCHAR    | 30        | NO        |
| INFORMATION    | CLOB        | 65536        | YES        |
| EXP_LEVEL    | INTEGER    | 4        | NO        |
| IP4B        | BIGINT    | 8        | NO        |
| MODIFIED    | INTEGER    | 4        | YES        |
| DETAIL    | VARCHAR    | 200        | YES        |
| FALSPOS    | INTEGER    | 4        | YES        |
-----------------------------------------------------------------

When it crashed I received this message from db2_fetch_both

db2_fetch_array() [function.db2-fetch-array]: Fetch Failure

After reported this message to IBM OpenDev I was helped by a OpenDev IBMer who noticed me 
that it wasn't a ibm_db2 module problem, in fact it was a database configuration 
issue. The OpenDev IBMer looked into my DB2 Client CLI TRACE files and found out what was happen.
So I had to modify APP_CTL_HEAP_SZ and everything seems to works fine now.

-- 
Esteban Acosta Villafañe
Area I+D
http://www.openware.biz/opendev
Linkein Profile: http://www.linkedin.com/in/estebanav

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