Update examples

Author: trowski

examples/2-simple-query.php

@@ -2,13 +2,18 @@
 
 require 'support/bootstrap.php';
 
+use Amp\Mysql\ResultSet;
+
 Amp\Loop::run(function() {
     $db = Amp\Mysql\pool("host=".DB_HOST.";user=".DB_USER.";pass=".DB_PASS.";db=".DB_NAME);
 
-    $query = yield $db->query("SELECT 1");
-    list($one) = yield $query->fetchRow();
+    /** @var \Amp\Mysql\ResultSet $result */
+    $result = yield $db->query("SELECT 1 AS value");
 
-    var_dump($one); // should output string(1) "1"
+    while (yield $result->advance(ResultSet::FETCH_ARRAY)) {
+        $row = $result->getCurrent();
+        var_dump($row[0]);
+    }
 
     $db->close();
 });

examples/3-generic-with-yield.php

@@ -7,10 +7,11 @@
 
     /* Create table and insert a few rows */
     /* we need to wait until table is finished, so that we can insert. */
-    yield $db->query("CREATE TABLE IF NOT EXISTS tmp SELECT 1 AS a, 2 AS b");
+    yield $db->query("CREATE TABLE IF NOT EXISTS tmp (a INT(10), b INT(10))");
 
     print "Table successfully created." . PHP_EOL;
 
+    /** @var \Amp\Mysql\Statement $statement */
     $statement = yield $db->prepare("INSERT INTO tmp (a, b) VALUES (?, ? * 2)");
 
     $promises = [];
@@ -23,6 +24,13 @@
 
     print "Insertion successful (if it wasn't, an exception would have been thrown by now)" . PHP_EOL;
 
+    /** @var \Amp\Mysql\ResultSet $result */
+    $result = yield $db->execute("SELECT a, b FROM tmp");
+
+    while (yield $result->advance()) {
+        var_dump($result->getCurrent());
+    }
+
     yield $db->query("DROP TABLE tmp");
 
     $db->close();

examples/4-multi-rows.php

@@ -11,18 +11,25 @@
 
     $promises = [];
 
-    /* yeah, we need a lot of yields and assigns here... */
     $promises[] = $db->query("SELECT a * b FROM tmp");
+    $promises[] = $db->execute("SELECT POW(a, ?) AS power FROM tmp", 2);
 
-    /* or, maybe, wait until they're all fetched (because you anyway only can continue after having full resultset */
-    $promises[] = $db->query("SELECT a * b FROM tmp");
-
-    list($result1, $result2) = yield $promises;
+    /**
+     * @var \Amp\Mysql\ResultSet $result1
+     * @var \Amp\Mysql\ResultSet $result2
+     */
+    list($result1, $result2) = yield $promises; // Both queries execute simultaneously. Wait for both to finish here.
 
+    print "Query 1 Results:" . PHP_EOL;
     while (yield $result1->advance()) {
         var_dump($result1->getCurrent());
     }
 
+    print  PHP_EOL . "Query 2 Results:" . PHP_EOL;
+    while (yield $result2->advance()) {
+        var_dump($result2->getCurrent());
+    }
+
     yield $db->query("DROP TABLE tmp");
 
     $db->close();

examples/5-multi-stmts.php

@@ -17,8 +17,6 @@
         var_dump($result->getCurrent());
     }
 
-    var_dump(yield $result->getFields());
-
     yield $db->query("DROP TABLE tmp");
 
     $db->close();

examples/support/generic-table.php

@@ -2,7 +2,9 @@
 
 /* Create table and fill in a few rows for examples; for comments see 3-generic-with-yield.php */
 function createGenericTable(\Amp\Mysql\Link $db): Generator {
-    yield $db->query("CREATE TABLE IF NOT EXISTS tmp SELECT 1 AS a, 2 AS b");
+    yield $db->query("DROP TABLE IF EXISTS tmp");
+
+    yield $db->query("CREATE TABLE tmp (a INT(10), b INT(10))");
 
     $statement = yield $db->prepare("INSERT INTO tmp (a, b) VALUES (?, ? * 2)");