MYSQL_FETCH_FIELD(3) 1 MYSQL_FETCH_FIELD(3)mysql_fetch_field - Get column information from a result and return as an objectSYNOPSIS
Warning
This extension is deprecated as of PHP 5.5.0, and will be removed in the future. Instead, the MySQLi or PDO_MySQL extension should
be used. See also MySQL: choosing an API guide and related FAQ for more information. Alternatives to this function include:
omysqli_fetch_field(3)
o PDOStatement::getColumnMeta
object mysql_fetch_field (resource $result, [int $field_offset])
DESCRIPTION
Returns an object containing field information. This function can be used to obtain information about fields in the provided query result.
o $
result -The result resource that is being evaluated. This result comes from a call to mysql_query(3).
o $field_offset
- The numerical field offset. If the field offset is not specified, the next field that was not yet retrieved by this function is
retrieved. The $field_offset starts at 0.
Returns an object containing field information. The properties of the object are:
o name - column name
o table - name of the table the column belongs to, which is the alias name if one is defined
o max_length - maximum length of the column
o not_null - 1 if the column cannot be
NULL
o primary_key - 1 if the column is a primary key
o unique_key - 1 if the column is a unique key
o multiple_key - 1 if the column is a non-unique key
o numeric - 1 if the column is numeric
o blob - 1 if the column is a BLOB
o type - the type of the column
o unsigned - 1 if the column is unsigned
o zerofill - 1 if the column is zero-filled
Example #1
mysql_fetch_field(3) example
<?php
$conn = mysql_connect('localhost', 'mysql_user', 'mysql_password');
if (!$conn) {
die('Could not connect: ' . mysql_error());
}
mysql_select_db('database');
$result = mysql_query('select * from table');
if (!$result) {
die('Query failed: ' . mysql_error());
}
/* get column metadata */
$i = 0;
while ($i < mysql_num_fields($result)) {
echo "Information for column $i:<br />
";
$meta = mysql_fetch_field($result, $i);
if (!$meta) {
echo "No information available<br />
";
}
echo "<pre>
blob: $meta->blob
max_length: $meta->max_length
multiple_key: $meta->multiple_key
name: $meta->name
not_null: $meta->not_null
numeric: $meta->numeric
primary_key: $meta->primary_key
table: $meta->table
type: $meta->type
unique_key: $meta->unique_key
unsigned: $meta->unsigned
zerofill: $meta->zerofill
</pre>";
$i++;
}
mysql_free_result($result);
?>
Note
Field names returned by this function are case-sensitive.
Note
If field or tablenames are aliased in the SQL query the aliased name will be returned. The original name can be retrieved for
instance by using mysqli_result::fetch_field.
mysql_field_seek(3).
PHP Documentation Group MYSQL_FETCH_FIELD(3)
Check Out this Related Man Page
MYSQL_FETCH_ARRAY(3) 1 MYSQL_FETCH_ARRAY(3)mysql_fetch_array - Fetch a result row as an associative array, a numeric array, or bothSYNOPSIS
Warning
This extension is deprecated as of PHP 5.5.0, and will be removed in the future. Instead, the MySQLi or PDO_MySQL extension should
be used. See also MySQL: choosing an API guide and related FAQ for more information. Alternatives to this function include:
omysqli_fetch_array(3)
o PDOStatement::fetch
array mysql_fetch_array (resource $result, [int $result_type = MYSQL_BOTH])
DESCRIPTION
Returns an array that corresponds to the fetched row and moves the internal data pointer ahead.
o $
result -The result resource that is being evaluated. This result comes from a call to mysql_query(3).
o $result_type
- The type of array that is to be fetched. It's a constant and can take the following values: MYSQL_ASSOC, MYSQL_NUM, and
MYSQL_BOTH.
Returns an array of strings that corresponds to the fetched row, or FALSE if there are no more rows. The type of returned array depends on
how $result_type is defined. By using MYSQL_BOTH (default), you'll get an array with both associative and number indices. Using
MYSQL_ASSOC, you only get associative indices (as mysql_fetch_assoc(3) works), using MYSQL_NUM, you only get number indices (as
mysql_fetch_row(3) works).
If two or more columns of the result have the same field names, the last column will take precedence. To access the other column(s) of the
same name, you must use the numeric index of the column or make an alias for the column. For aliased columns, you cannot access the con-
tents with the original column name.
Example #1
Query with aliased duplicate field names
SELECT table1.field AS foo, table2.field AS bar FROM table1, table2
Example #2
mysql_fetch_array(3) with MYSQL_NUM
<?php
mysql_connect("localhost", "mysql_user", "mysql_password") or
die("Could not connect: " . mysql_error());
mysql_select_db("mydb");
$result = mysql_query("SELECT id, name FROM mytable");
while ($row = mysql_fetch_array($result, MYSQL_NUM)) {
printf("ID: %s Name: %s", $row[0], $row[1]);
}
mysql_free_result($result);
?>
Example #3
mysql_fetch_array(3) with MYSQL_ASSOC
<?php
mysql_connect("localhost", "mysql_user", "mysql_password") or
die("Could not connect: " . mysql_error());
mysql_select_db("mydb");
$result = mysql_query("SELECT id, name FROM mytable");
while ($row = mysql_fetch_array($result, MYSQL_ASSOC)) {
printf("ID: %s Name: %s", $row["id"], $row["name"]);
}
mysql_free_result($result);
?>
Example #4
mysql_fetch_array(3) with MYSQL_BOTH
<?php
mysql_connect("localhost", "mysql_user", "mysql_password") or
die("Could not connect: " . mysql_error());
mysql_select_db("mydb");
$result = mysql_query("SELECT id, name FROM mytable");
while ($row = mysql_fetch_array($result, MYSQL_BOTH)) {
printf ("ID: %s Name: %s", $row[0], $row["name"]);
}
mysql_free_result($result);
?>
Note
Performance
An important thing to note is that using mysql_fetch_array(3) is not significantly slower than using mysql_fetch_row(3), while it
provides a significant added value.
Note
Field names returned by this function are case-sensitive.
Note
This function sets NULL fields to the PHP NULL value.
mysql_fetch_row(3), mysql_fetch_assoc(3), mysql_data_seek(3), mysql_query(3).
PHP Documentation Group MYSQL_FETCH_ARRAY(3)