(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)
Sends a query and fetch all results.
link_identifier
The DBX link object returned by dbx_connect()
sql_statement
SQL statement.
Data inside the query should be properly escaped.
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
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
DBX_RESULT_ASSOC
DBX_RESULT_UNBUFFERED
DBX_COLNAMES_UNCHANGED
DBX_COLNAMES_UPPERCASE
DBX_COLNAMES_LOWERCASE
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.
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
:
It is a valid handle for the connected database, and as such it can be used in module specific functions (if required).
<?php
$result = dbx_query($link, "SELECT id FROM table");
mysql_field_len($result->handle, 0);
?>
These contain the number of columns (or fields) and rows (or records) respectively.
<?php
$result = dbx_query($link, 'SELECT id FROM table');
echo $result->rows; // number of records
echo $result->cols; // number of fields
?>
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 #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";
}
?>
flags
.
If DBX_RESULT_ASSOC
is set, it is possible to use
$result->data[2]["field_name"].
Example #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";
?>
Example #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";
?>
版本 | 说明 |
---|---|
5.0.0 |
Introduced DBX_RESULT_UNBUFFERED .
|
4.3.0 |
Introduced DBX_COLNAMES_UNCHANGED ,
DBX_COLNAMES_UPPERCASE , and
DBX_COLNAMES_LOWERCASE .
|
Example #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);
?>
Note:
Always refer to the module-specific documentation as well.
Column names for queries on an Oracle database are returned in lowercase.