[英]Fetching data from two MySQL tables simlutenously with PHP + AJAX
I'm creating a search box that queries two MySQL tables and lists the results in real time. 我正在创建一个查询框,该查询框查询两个MySQL表并实时列出结果。 For now though, I have a working prototype that will query only one table.
不过,到目前为止,我有一个可以正常工作的原型,该原型只能查询一个表。 I've written the following PHP code in conjunction with JQuery and it works wonderfully:
我已经与JQuery一起编写了以下PHP代码,并且效果很好:
HTML 的HTML
<input onkeyup="search(this);" type="text">
<ol id="search-results-container"></ol>
Javascript Java脚本
function search(input) {
var inputQuery = input.value;
/* $() creates a JQuery selector object, so we can use its html() method */
var resultsList = $(document.getElementById("search-results-container"));
//Check if string is empty
if (inputQuery.length > 0) {
$.get("search-query.php", {query: inputQuery}).done(function(data) {
//Show results in HTML document
resultsList.html(data);
});
}
else { //String query is empty
resultList.empty();
}
}
and PHP 和PHP
<?php
include("config.php"); //database link
if(isset($_REQUEST["query"])) {
$sql = "SELECT * FROM students WHERE lastname LIKE ? LIMIT 5";
/* Creates $stmt and checks if mysqli_prepare is true */
if ($stmt = mysqli_prepare($link, $sql)) {
//Bind variables to the prepared statement as parameters
mysqli_stmt_bind_param($stmt, "s", $param_query);
//set parameters
$param_query = $_REQUEST["query"] . '%';
//Try and execute the prepared statement
if (mysqli_stmt_execute($stmt)) {
$result = mysqli_stmt_get_result($stmt);
//get number of rows
$count = mysqli_num_rows($result);
if ($count > 0) {
//Fetch result rows as assoc array
$row = mysqli_fetch_array($result, MYSQLI_ASSOC);
echo "<h1>Students:</h1>"; //Header indicates student list
for ($i = 0; $i < $count; $i++) {
$name = $row["lastname"];
echo "<p>$name</p>";
}
}
else { //Count == 0
echo "No matches found.<br>";
}
}
else { //Execution of preped statement failed.
echo "Could not execute MySQL query.<br>";
}
} // end mysqli_prepare
} // end $_RESQUEST isset
?>
The details of the students
table are arbitrary, except for the fact that it has a String column that lists the student's last name. students
表的详细信息是任意的,除了它具有列出学生姓氏的“字符串”列之外。
My problem is that there is also a staff
table which is effectively the same as students
but for a different purpose. 我的问题是, 还有一个
staff
表,该表实际上是相同的students
,但为了不同的目的。 I'd like to query the staff
table at the same time as students
, but have the results separated like so: 我想在与
students
同时查询staff
表时,将结果分开,如下所示:
<h1>Students:</h1>
<p>Student1</p>
<p>Student2</p>
<h1>Staff</h1>
<p>Staff1</p>
<p>Staff2</p>
The obvious answer would be to add another $sql
statement similar to the one on Line 5 and just do both queries serially - effectively doubling the search time - but I'm concerned this will take too long. 显而易见的答案是添加另一个类似于第5行的
$sql
语句,并且只按顺序执行两个查询-有效地使搜索时间加倍-但我担心这将花费很长时间。 Is this a false assumption (that there will be a noticeable time difference), or is there actually a way to do both queries alongside each other? 这是一个错误的假设(会有明显的时差),还是实际上有一种方法可以同时进行两个查询? Thanks in advance!
提前致谢!
If the two tables have identical structures, or if there is a subset of columns which could be made to be the same, then a UNION
query might work here: 如果两个表具有相同的结构,或者如果可以使列的子集相同,则
UNION
查询可能在这里起作用:
SELECT *, 0 AS type FROM students WHERE lastname LIKE ?
UNION ALL
SELECT *, 1 FROM staff WHERE lastname LIKE ?
ORDER BY type;
I removed the LIMIT
clause because you don't have an ORDER BY
clause, which makes using LIMIT
fairly meaningless. 我删除了
LIMIT
子句,因为您没有ORDER BY
子句,这使使用LIMIT
变得毫无意义。
Note that I introduced a computed column type
which the result set, when ordered by it, would place students before staff. 请注意,我介绍了一种计算列
type
,结果集按其排序时会将学生放在工作人员之前。 Then, in your PHP code, you would just need a bit of logic to display the header for students and staff: 然后,在您的PHP代码中,您只需要一些逻辑即可为学生和工作人员显示标题:
$count = mysqli_num_rows($result);
$type = -1;
while ($count > 0) {
$row = mysqli_fetch_array($result, MYSQLI_ASSOC);
$curr_type = $row["type"];
if ($type == -1) {
echo "<h1>Students:</h1>";
$type = 0;
}
else if ($type == 0 && $curr_type == 1) {
echo "<h1>Staff:</h1>";
$type = 1;
}
$name = $row["lastname"];
echo "<p>$name</p>";
--$count;
}
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