Sends asynchronous query

# pg_send_query

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

pg_send_query — Sends asynchronous query

### Description

pg_send_query(PgSql\Connection `$connection`, string `$query`): int|bool

pg_send_query() sends a query or queries asynchronously to the `connection`. Unlike pg_query(), it can send multiple queries at once to PostgreSQL and get the results one by one using pg_get_result().

Script execution is not blocked while the queries are executing. Use pg_connection_busy() to check if the connection is busy (i.e. the query is executing). Queries may be cancelled using pg_cancel_query().

Although the user can send multiple queries at once, multiple queries cannot be sent over a busy connection. If a query is sent while the connection is busy, it waits until the last query is finished and discards all its results.

### Parameters

`connection`

  An PgSql\Connection instance.

`query`

  The SQL statement or statements to be executed.

  Data inside the query should be properly escaped.

### Return Values

Returns `true` on success, `false` or `0` on failure. Use pg_get_result() to determine the query result.

### Changelog

Version | Description
--- | ---
8.1.0 | The `connection` parameter expects an PgSql\Connection instance now; previously, a resource was expected.

### Examples

Example #1 pg_send_query() example

`<?php
$dbconn = pg_connect("dbname=publisher") or die("Could not connect");
if (!pg_connection_busy($dbconn)) {
pg_send_query($dbconn, "select * from authors; select count(*) from authors;");
}
$res1 = pg_get_result($dbconn);
echo "First call to pg_get_result(): $res1\n";
$rows1 = pg_num_rows($res1);
echo "$res1 has $rows1 records\n\n";
$res2 = pg_get_result($dbconn);
echo "Second call to pg_get_result(): $res2\n";
$rows2 = pg_num_rows($res2);
echo "$res2 has $rows2 records\n";
?>`

The above example will output:

    First call to pg_get_result(): Resource id #3
    Resource id #3 has 3 records

    Second call to pg_get_result(): Resource id #4
    Resource id #4 has 1 records

### See Also

- pg_query() - Execute a query
- pg_cancel_query() - Cancel an asynchronous query
- pg_get_result() - Get asynchronous query result
- pg_connection_busy() - Get connection is busy or not

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