09-16-2019
Normally we write the processing of SQL statements in a server-side scripting language meant for the web, using "created for the web languages" like PHP or Javascript.
Also, depending on how you write your SQL select query, the results of the select query are generally in an array and so the script generally needs to process an array, not a simple string or text file.
However, if you are looking for a single element only from the SQL select query, the results of the SQL query are often still in an array, a single element array.
So, in the general case, you should write your script to process an array as the input to your script which is the output of the SQL query.
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LEARN ABOUT PHP
pg_prepare
PG_PREPARE(3) PG_PREPARE(3)
pg_prepare - Submits a request to create a prepared statement with the given parameters, and waits for completion.
SYNOPSIS
resource pg_prepare ([resource $connection], string $stmtname, string $query)
DESCRIPTION
pg_prepare(3) creates a prepared statement for later execution with pg_execute(3) or pg_send_execute(3). This feature allows commands that
will be used repeatedly to be parsed and planned just once, rather than each time they are executed. pg_prepare(3) is supported only
against PostgreSQL 7.4 or higher connections; it will fail when using earlier versions.
The function creates a prepared statement named $stmtname from the $query string, which must contain a single SQL command. $stmtname may
be "" to create an unnamed statement, in which case any pre-existing unnamed statement is automatically replaced; otherwise it is an error
if the statement name is already defined in the current session. If any parameters are used, they are referred to in the $query as $1, $2,
etc.
Prepared statements for use with pg_prepare(3) can also be created by executing SQL PREPARE statements. (But pg_prepare(3) is more flexi-
ble since it does not require parameter types to be pre-specified.) Also, although there is no PHP function for deleting a prepared state-
ment, the SQL DEALLOCATE statement can be used for that purpose.
PARAMETERS
o $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(3) or pg_pconnect(3).
o $stmtname
- The name to give the prepared statement. Must be unique per-connection. If "" is specified, then an unnamed statement is cre-
ated, overwriting any previously defined unnamed statement.
o $query
- The parameterized 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.
RETURN VALUES
A query result resource on success or FALSE on failure.
EXAMPLES
Example #1
Using pg_prepare(3)
<?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"));
?>
SEE ALSO
pg_execute(3), pg_send_execute(3).
PHP Documentation Group PG_PREPARE(3)