PHP和MYSQL JSON API查询

我一直在寻找答案，并尝试了多种方法，但无论我如何说，似乎仍然无法弄清楚。我想念一些东西..哈哈。

我有一个从mysql获取数据的php文件。

$query = "SELECT * FROM `UnitMaintbl` WHERE `Unit` LIKE '%{$value}%' ORDER BY Recnum DESC";

这很好用，但是我有一个字段是另一个表的索引，我需要另一个表的描述。所以我需要INNER JOIN两个表。好的，没问题。

$query = "SELECT * FROM `UnitMaintbl` 
INNER JOIN `Statustbl` ON UnitMaintbl.StatusID=Statustbl.StatusDesc
ORDER BY Recnum DESC";

首先，我想让JOIN在任何要测试的单元上工作。然后，我想从表单中将$ Value取回。所以...

$query = "SELECT * FROM `UnitMaintbl` 
INNER JOIN `Statustbl` ON UnitMaintbl.StatusID=Statustbl.StatusDesc
WHERE Unitmaintbl.Unit = '%{$value}%'"
ORDER BY Recnum DESC";

香港专业教育学院尝试了几种不同的帮助方案，但似乎无法正常工作。

非常感谢您的任何帮助。

编辑

<?php


$host = "localhost"; //Your database host server
$db = "PicorpBE"; //Your database name
$user = "username"; //Your database user
$pass = "password"; //Your password
$value=$_GET['Unit']; // Unit Number

$connection = mysql_connect($host, $user, $pass);

//Check to see if we can connect to the server
if(!$connection)
{
    die("Database server connection failed.");  
}
else
{
    //Attempt to select the database
    $dbconnect = mysql_select_db($db, $connection);

    //Check to see if we could select the database
    if(!$dbconnect)
    {
        die("Unable to connect to the specified database!");
    }
    else
    {

    $query = "SELECT * FROM `UnitMaintbl` 
    INNER JOIN `Statustbl` ON UnitMaintbl.StatusID=Statustbl.StatusDesc
WHERE Unitmaintbl.Unit = '%{$value}%'
ORDER BY Recnum DESC";

$resultset = mysql_query($query, $connection);

        $records = array();

        //Loop through all our records and add them to our array
        while($r = mysql_fetch_assoc($resultset))
        {
            $records[] = $r;        
        }

        //Output the data as JSON
        echo json_encode($records);
    }


}

?>

香港专业教育学院重做的PHP，而不是我得到：

[23-Dec-2015 14:26:52] PHP警告：mysqli_query（）[function.mysqli-query]：/home/picorp05/public_html/json.php中第25行的空查询[2015年12月23日14： [26:52] PHP警告：mysqli_close（）期望参数1为mysqli，在第45行的/home/picorp05/public_html/json.php中给出的布尔值

<?php
// Variables From Search

$sunit=$_GET['Unit']; // Unit Number

// Create connection
$con=mysqli_connect("localhost","username","password","dbname");

// Check connection
if (mysqli_connect_errno())
{
  echo "Failed to connect to MySQL: " . mysqli_connect_error();
}

// This SQL statement should select Unit ($sunit) from the table     'UnitMainTbl and
// Join related table. '

$query = "SELECT * FROM `UnitMaintbl` 
         INNER JOIN `Statustbl` ON UnitMaintbl.StatusID=Statustbl.StatusDesc
         WHERE Unitmaintbl.Unit = '%{$sunit}%'
         ORDER BY Recnum DESC";

// Check if there are results
if ($result = mysqli_query($con, $sql))
{
// If so, then create a results array and a temporary one
// to hold the data
$resultArray = array();
$tempArray = array();

// Loop through each row in the result set
while($row = $result->fetch_object())
{
    // Add each row into our results array
    $tempArray = $row;
    array_push($resultArray, $tempArray);
}

// Finally, encode the array to JSON and output the results
echo json_encode($resultArray);
}

// Close connections
mysqli_close($result);
mysqli_close($con);
?>

好的最终代码，无论如何我的前几个测试都可以使用哈哈.. woohoo ..谢谢大家的帮助。

<?php

// Variables From Search
$sunit=$_GET['Unit']; // Unit Number

//open connection to mysql db
$connection = mysqli_connect("localhost","user","pass","PicorpBE") or     die("Error " . mysqli_error($connection));

//fetch table rows from mysql db
$sql = "SELECT * FROM `UnitMaintbl` 
    INNER JOIN `Statustbl` ON UnitMaintbl.StatusID=Statustbl.StatusDesc
    WHERE UnitMaintbl.Unit LIKE '%{$sunit}%'
    ORDER BY Recnum DESC";

$result = mysqli_query($connection, $sql) or die("Error in Selecting " . mysqli_error($connection));

//create an array
$emparray = array();
while($row =mysqli_fetch_assoc($result))
{
    $emparray[] = $row;
}
echo json_encode($emparray);

//close the db connection
mysqli_close($connection);
?>