dbx_query
(PHP 4 >= 4.0.6, PHP 5 <= 5.0.5, PECL dbx >= 1.1.0) dbx_query — Send a query and fetch all results (if any)
Описание
mixed dbx_query
( object $link_identifier
, string $sql_statement
[, int $flags
] )
Список параметров
-
link_identifier
-
The DBX link object returned by dbx_connect()
-
sql_statement
-
SQL statement.
-
flags
-
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_RESULT_UNBUFFERED (PHP 5)
-
This flag will not create the data property, and
the rows property will initially be 0. Use this
flag for large datasets, and use dbx_fetch_row() to
retrieve the results row by row.
The dbx_fetch_row() function will return rows that
are conformant to the flags set with this query. Incidentally, it will
also update the rows each time it is called.
-
DBX_COLNAMES_UNCHANGED (available from PHP 4.3.0)
-
The case of the returned column names will not be changed.
-
DBX_COLNAMES_UPPERCASE (available from PHP 4.3.0)
-
The case of the returned column names will be changed to
uppercase.
-
DBX_COLNAMES_LOWERCASE (available from PHP 4.3.0)
-
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 only the following combinations are effective:
-
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.
Возвращаемые значения
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 (i.e. a SELECT query, even if the result set is
empty).
The returned 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).
-
cols and rows
-
These contain the number of columns (or fields) and rows (or records)
respectively.
-
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.
Пример #1 lists each field's name and type
<?php
$result = dbx_query($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"].
Пример #2 outputs the content of data property into HTML table
<?php
$result = dbx_query($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";
?>
Пример #3 How to handle UNBUFFERED queries
<?php
$result = dbx_query ($link, 'SELECT id, parentid, description FROM table', DBX_RESULT_UNBUFFERED);
echo "<table>\n";
while ($row = dbx_fetch_row($result)) {
echo "<tr>\n";
foreach ($row as $field) {
echo "<td>$field</td>";
}
echo "</tr>\n";
}
echo "</table>\n";
?>
Примеры
Пример #4 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($result) ) {
// ... do some stuff here, see detailed examples below ...
// first, print out field names and types
// then, draw a table filled with the returned field values
} else {
exit("Query failed");
}
dbx_close($link);
?>
Примечания
Замечание:
Always refer to the module-specific documentation as well.
Column names for queries on an Oracle database are returned in lowercase.
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