Add prepare tests

Author: matyhtf

examples/parpare.php

@@ -0,0 +1,21 @@
+<?php
+
+use Swoole\Event;
+
+go(function () {
+    $pg = new Swoole\Coroutine\PostgreSQL();
+    $conn = $pg->connect("host=127.0.0.1;port=5432;dbname=test;user=postgres;password=postgres");
+    if (!$conn) {
+        var_dump($pg->error);
+        return;
+    }
+
+    $prepare_result = $pg->prepare('key', "INSERT INTO weather(city, temp_lo, temp_hi, prcp, date) 
+                        VALUES ($1, $2, $3, $4, $5)  RETURNING id");
+    var_dump($prepare_result);
+    $execute_result = $pg->execute('key', ['Beijing', rand(1000, 99999), 10, 0.75, '1993-11-23']);
+
+    var_dump($execute_result);
+});
+
+Event::wait();

tests/unit/PostgreSQLTest.php

@@ -35,6 +35,18 @@ public function testInsert()
         });
     }
 
+    public function testPrepare()
+    {
+        run(function () {
+            $pg = $this->getConn();
+            $prepare_result = $pg->prepare('key', "INSERT INTO weather(city, temp_lo, temp_hi, prcp, date) 
+                        VALUES ($1, $2, $3, $4, $5)  RETURNING id");
+            $this->assertNotFalse($prepare_result, (string) $pg->error);
+            $execute_result = $pg->execute('key', ['Beijing', rand(1000, 99999), 10, 0.75, '1993-11-23']);
+            $this->assertNotFalse($execute_result, (string) $pg->error);
+        });
+    }
+
     public function testQuery()
     {
         run(function () {