/usr/share/doc/php5-mysqlnd-ms/examples/rw_split.php is in php5-mysqlnd-ms 1.5.2-3build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/*
Simple read/write split demo.
See README for hints and instructions!
*/
function run_query($conn, $query) {
global $queries;
/* PECL/mysqlnd_ms will either choose the master or one of the slaves */
$ret = $conn->query($query);
/* After the query has been send, $conn either points to master or slave.
By recording the connection thread id we can reverse-engineer which
queries have been send via which connection. One cannot tell based on
the thread id if a connection is a master or slave connection but
common sense will tell you if you look at the recorded data... */
if (!isset($queries[$conn->thread_id]))
$queries[$conn->thread_id] = array($query);
else
$queries[$conn->thread_id][] = $query;
if (!$ret)
/* KLUDGE - you will do proper error handling, won't you? */
die(sprintf("[%d] %s\n", $conn->errno, $conn->error));
return $ret;
}
require_once("./config.php");
printf("\n");
if (!($conn = new mysqli("myapp", DB_USER, DB_PASSWORD, DB_SCHEMA)) || mysqli_connect_errno()) {
die(sprintf("Please check the *config.json used and config.php, failed to connect: [%d] %s\n",
mysqli_connect_errno(), mysqli_connect_error()));
}
$queries = array();
printf("Creating a test table. Statements should be send to the master...\n");
run_query($conn, "DROP TABLE IF EXISTS test");
run_query($conn, "CREATE TABLE test(id INT)");
run_query($conn, "INSERT INTO test(id) VALUES (1)");
printf("Dumping list of connections. Should be only one, the master connection...\n");
foreach ($queries as $thread_id => $details) {
printf("\t... Connection %d has run\n", $thread_id);
foreach ($details as $query)
printf("\t\t... %s\n", $query);
}
printf("Running a SELECT, it should be send to the slaves...\n");
run_query($conn, "SELECT 1 FROM DUAL");
printf("Dropping the test table. Statement should be send to the master...\n");
run_query($conn, "DROP TABLE IF EXISTS test");
printf("Dumping list of connections. Should be two: master and slave...\n");
foreach ($queries as $thread_id => $details) {
printf("\t... Connection %d has run\n", $thread_id);
foreach ($details as $query)
printf("\t\t... %s\n", $query);
}
printf("\n");
?>
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