Question

我可以在mangodb中执行以下查询

MySQL的：

SELECT * FROM users WHERE user_id like "bc%;

MangoDB：

db.users.find( { user_id: /^bc/ } )

以上查询正在运行。但是以下查询不起作用，请我给出建议。

MySQL的：

SELECT * FROM users WHERE user_id like "%bc";

MangoDB：

db.users.find( { user_id: /bc^/ } );

Answer 1

那必须是：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
<style>
.container{
    width:960px;
    margin:auto;
}
.header{
    width:960px;
    height:100px;
    background-color:#06F;
    float:left;
}
.trolley{
    width:150px;
    height:30px;
    background-color:white;
    float:right;
    border-radius:10px;
    color:black;
    border:1px solid black;
    line-height:30px;
    font-family:"Calibri";
    cursor: pointer;
}
.shop{
    width:960px;
    height:700px;
    background-color:white;
    float:left;
    font-family:"Calibri Light";
    padding:20px;
}
#shoppingTab{
    display:none;
    height:400px;
    width:400px;
    background-color:#CCC;
    color:black;
    position:relative;
    margin-top:1px;
    border-radius:10px;
    color:black;
    border:1px solid black;
    padding-left:10px;
    float:right;
}
html{
    background-color:#00F;
}
.product{
    height:200px;
    width:150px;
    float:left;
    border: 1px solid black;
    border-radius:10px;
    margin-right:20px;
    font-size:16px;
    text-align:center;
    cursor:pointer;
}
.product:hover{
    border:1px solid blue;
}
</style>
</head>

<body>
<div class="container">
    <div class="header">
        <span id="name"></span><div class="trolley" onmouseover="tabDisplay('block')" onmouseout="tabDisplay('none')"><center>Shopping Cart <span style='font-family:webdings'>&#164;</span> <span id="NOI" style="background-color:red; border-radius:360px; color:white; padding-left:5px;padding-right:5px">0</span></center>
            <div id="shoppingTab">You have selected <span id="NOI2">0</span> items. Your total is $<span id="totalPrice">0</span><br/><span id="itemsList"></span></div>
        </div>
    </div>
    <div class="shop" style="font-size:28px">Welcome, <span id="name2"></span>.<hr /><br/>Products<br/><hr />

    <div class="product" onclick="addToCart('sunglasses', 0, 70)">Pair of sunglasses ($70)<br /><br /><span onclick="change(1)">Click to add to cart</span></div>
    <div class="product" onclick="addToCart('shoes', 1, 180)">Pair of shoes ($180)<br /><br /><span onclick="change(3)">Click to add to cart</span></div>
    <div class="product" onclick="addToCart('belt', 2, 20)">A belt ($20)<br /><br /><span onclick="change(3)">Click to add to cart</span></div>
    </div>

</div>
</body>
</html>
<script>
var customerName = "";
var numberOfItems = 0;
var total = 0;
var items = [];
var stat = []

for(var a = 1; a <= 3; a++){
    stat[a] = false;
}

function update(){
    document.getElementById("NOI").innerHTML = numberOfItems;
    document.getElementById("NOI2").innerHTML = numberOfItems;
    document.getElementById("totalPrice").innerHTML = total;
    document.getElementById("itemsList").innerHTML = items.join("<br />");
}
function tabDisplay(displayStatus){
    shoppingTab.style.display = displayStatus;
}

function addToCart(productName, productID, price){
    items[productID] = productName;
    total += price;
    numberOfItems++;
    update();
}

function removeFromCart(productName, productID, price){
    items.splice(productID, 1);
    total -= price;
    if(stat[productID]){
    numberOfItems--;
    }
    update();
}

function change(i){
    if(stat[i] == false){
        stat[i] = true;
    }else{
        stat[i] = false;
    }
}

function setCookie(cname,cvalue,exdays) {
    var d = new Date();
    d.setTime(d.getTime() + (exdays*24*60*60*1000));
    var expires = "expires=" + d.toGMTString();
    document.cookie = cname+"="+cvalue+"; "+expires;
}

function getCookie(cname) {
    var name = cname + "=";
    var ca = document.cookie.split(';');
    for(var i=0; i<ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0)==' ') c = c.substring(1);
        if (c.indexOf(name) == 0) {
            return c.substring(name.length, c.length);
        }
    }
    return "";
}

function checkCookie() {
    var user = getCookie("customer");
    if (user != "") {
        customerName = getCookie("customer");
        document.getElementById("name").innerHTML = customerName;
        alert("Welcome again, " + user + ".");
    } else {
        document.getElementById("name").innerHTML = "please set up an account";
       user = prompt("Please enter your name:","");
       if (user != "" && user != null) {
           setCookie("customer", user, 30);
           document.getElementById("name").innerHTML = user;
       }
    }
}

function changeCookie(){
    var user = getCookie("customer");
    user = prompt("Please enter your name:","");
       if (user != "" && user != null) {
           setCookie("customer", user, 30);
       }
       document.getElementById("name").innerHTML = user;
}
checkCookie();
</script>

或类似的

db.users.find({"name": /.*m.*/})

你正在寻找某处包含“m”的东西（SQL的'％'运算符相当于regexp的'。*'），而不是将“m”锚定到字符串开头的东西。

请查看更多信息： How to query MongoDB with "like"?

Answer 2

在Regex中，^字符标记主题的开头。因此将它放在右侧是没有意义的。

相反，与^类似的“字符串结尾”为$：

db.users.find( { user_id: /bc$/ } );

这转换为：查找user_id属性的最后两个字符为“bc”的用户。

如何使用＆＃34;值％＆＃34;在mangodb中使用like keyword

2 个答案: