pg_prepare() returns a query result resource if
query could be prepared. It returns FALSE on failure or if
connection is not a valid connection. Details about the error can
be retrieved using the pg_last_error()
function if connection is valid.
pg_prepare() prepares an SQL statement for
the PostgreSQL database connection specified by the
connection resource. The
connection must be a valid connection that
was returned by pg_connect() or
pg_pconnect(). The return value of this
function is an query result resource. The stmtname
is the name of the prepared query, for future use with
pg_execute() or pg_send_execute().
Note: connection is an optional parameter for
pg_prepare(). If
connection is not set, default
connection is used. Default connection is the last connection
made by pg_connect() or
pg_pconnect().
Although connection can be omitted, it
is not recommended, since it could be a cause of hard to find
bug in script.
Parameters to pg_prepare() are specified
using placeholders in the query. It is not necessary to quote
parameters as quoting and escaping is done automatically.
Placeholders are indicated in the query
by $1, $2, $3 and so on.
Using prepared queries means you can prepare one and
then execute many times, with different parameters. PostgreSQL
will cache the query plan on the prepare, then re-use it for
each execute, resulting in speed improvements. There is no
need to use a prepared query if it will only be executed once.
In this case, it is simpler to use pg_query_params().
Examples
Example 1. Using pg_prepare()
<?php // Connect to a database named "mary" $dbconn = pg_connect("dbname=mary");
// Prepare a query for execution $result = pg_prepare($dbconn, "my_query", 'SELECT * FROM shops WHERE name = $1');
// Execute the prepared query. Note that it is not necessary to escape // the string "Joe's Widgets" in any way $result = pg_execute($dbconn, "my_query", array("Joe's Widgets"));
// Execute the same prepared query, this time with a different parameter $result = pg_execute($dbconn, "my_query", array("Clothes Clothes Clothes"));
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Php pg prepare syntax tutorial
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