Описание

resource pg_prepare (resource connection, string stmtname, string query)

resource pg_prepare (string stmtname, string query)

- pg_prepare() creates a prepared statement for later execution with

pg_execute() or pg_send_execute().

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() 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() can also be created by

executing SQL PREPARE statements. (But pg_prepare() is more flexible since it

does not require parameter types to be pre-specified.) Also, although there

is no PHP function for deleting a prepared statement, the SQL DEALLOCATE

statement can be used for that purpose.

Список параметров

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().

stmtname

- The name to give the prepared statement. Must be unique per-connection. If

"" is specified, then an unnamed statement is created, overwriting any

previously defined unnamed statement.

query

- 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.

Примеры - Пример 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")); ?>

pg_prepare

Описание

Список параметров

Возвращаемые значения

Примеры

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