PHP pg_query_params function
pg_query_params
(PHP 5 >= 5.1.0RC1)
pg_query_params -- Submits a command to the server and waits for the result, with the ability to pass parameters separately from the SQL command text.Descriptionresource pg_query_params ( resource connection, string query, array params )resource pg_query_params ( string query, array params )
Submits a command to the server and waits for the result, with the ability
to pass parameters separately from the SQL command text.
pg_query_params() is like pg_query(),
but offers additional functionality: parameter
values can be specified separately from the command string proper.
pg_query_params() is supported only against PostgreSQL 7.4 or
higher connections; it will fail when using earlier versions.
If parameters are used, they are referred to in the query
string as $1, $2, etc. params specifies the actual values of the
parameters. A NULL value in this array means the corresponding parameter is SQL
NULL.
The primary advantage of pg_query_params() over pg_query()
is that parameter values
may be separated from the query string, thus avoiding the need for tedious
and error-prone quoting and escaping. Unlike pg_query(),
pg_query_params() allows at
most one SQL command in the given string. (There can be semicolons in it,
but not more than one nonempty command.)
connection
PostgreSQL database connection resource. When
connection is not present, the default connection
is used. The default connection is the last connection made by
pg_connect() or pg_pconnect().
The parameterised SQL statement. Must contain only a single statement.
(multiple statements separated by semi-colons are not allowed.) If any parameters
are used, they are referred to as $1, $2, etc.
An array of parameter values to substitute for the $1, $2, etc. placeholders
in the original prepared query string. The number of elements in the array
must match the number of placeholders.
Return Values
A query result resource on success, or FALSE on failure.
Examples
Example 1. Using pg_query_params()
$dbconn = pg_connect("dbname=mary");
// Find all shops named Joe's Widgets. Note that it is not necessary to
// escape "Joe's Widgets"
$result = pg_query_params($dbconn, 'SELECT * FROM shops WHERE name = $1', array("Joe's Widgets"));
// Compare against just using pg_query
$str = pg_escape_string("Joe's Widgets");
$result = pg_query($dbconn, "SELECT * FROM shops WHERE name = '{$str}'");
See Also
pg_query()
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- Published:
- 2.26.07 / 12am
- Category:
- PHP Functions
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