将以下语句 转换为 mysql 查询语 return this.lambdaQuery() // 在约定的状态内 .in(SecondBargainEntity::getStatus, statusList) // 已过期 .apply("date_format (deadline,'%Y-%m-%d %H:%i:%s') < date_format('" + LocalDateTime.now() + "','%Y-%m-%d %H:%i:%s')") .last("limit " + batchSize) .list();
时间: 2024-02-14 17:12:19 浏览: 19
以下是将该语句转换成 MySQL 查询语句的代码:
```
SELECT * FROM second_bargain
WHERE `status` IN (statusList)
AND date_format(deadline, '%Y-%m-%d %H:%i:%s') < date_format(NOW(), '%Y-%m-%d %H:%i:%s')
LIMIT batchSize;
```
请注意,`statusList` 和 `batchSize` 需要替换为具体的值。另外,返回结果需要根据具体情况进行处理。
相关问题
vue中怎么通过get请求将数组数据存入mysql 详细代码
在Vue中通过get请求将数组数据存入MySQL,需要使用后端技术来处理接收请求和存储数据。以下是一个简单的示例代码:
前端代码:
```html
<template>
<div>
<button @click="saveData">保存数据</button>
</div>
</template>
<script>
import axios from 'axios'
export default {
name: 'SaveData',
data() {
return {
dataList: [
{ name: '张三', age: 20 },
{ name: '李四', age: 22 },
{ name: '王五', age: 25 }
]
}
},
methods: {
saveData() {
axios.get('/saveData', {
params: {
dataList: this.dataList
}
}).then(res => {
console.log('保存成功!')
}).catch(err => {
console.error(err)
})
}
}
}
</script>
```
后端代码(使用Node.js和Express框架):
```javascript
const express = require('express')
const mysql = require('mysql')
const app = express()
// 创建数据库连接池
const pool = mysql.createPool({
host: 'localhost',
user: 'root',
password: '******',
database: 'test'
})
// 处理保存数据请求
app.get('/saveData', (req, res) => {
const dataList = req.query.dataList
const sql = 'INSERT INTO user (name, age) VALUES ?'
const values = dataList.map(item => [item.name, item.age])
pool.query(sql, [values], (err, result) => {
if (err) {
console.error(err)
res.status(500).send('保存数据失败!')
} else {
console.log(result)
res.send('保存数据成功!')
}
})
})
app.listen(3000, () => {
console.log('服务器已启动!')
})
```
在上面的示例代码中,前端通过axios库发送get请求,将dataList数组作为参数传递给后端。后端接收到请求后,解析请求参数,将数据存入MySQL数据库中。
需要注意的是,为了避免SQL注入攻击,需要使用参数化查询来执行SQL语句。在本例中,使用问号占位符和数组方式来实现参数化查询。
Node.js+MySQL实现的客服系统
以下是一个简单的Node.js和MySQL实现的客服系统的示例代码:
1. 创建数据库和表
首先,需要创建一个MySQL数据库和相应的表,用于存储客户数据和订单信息。可以执行以下SQL语句来创建表:
```
CREATE DATABASE `customer_service`;
USE `customer_service`;
CREATE TABLE `customers` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) NOT NULL,
`email` varchar(255) NOT NULL,
`phone` varchar(20) NOT NULL,
`message` text NOT NULL,
`created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
CREATE TABLE `orders` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`customer_id` int(11) NOT NULL,
`product` varchar(255) NOT NULL,
`quantity` int(11) NOT NULL,
`price` decimal(10,2) NOT NULL,
`created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (`id`),
KEY `fk_customer_id` (`customer_id`),
CONSTRAINT `fk_customer_id` FOREIGN KEY (`customer_id`) REFERENCES `customers` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
```
2. 创建Node.js服务端程序
接下来,可以创建一个Node.js服务端程序,用于处理客户端的请求和响应。可以使用Express框架来创建一个简单的HTTP服务,并使用mysql模块来连接MySQL数据库和执行SQL查询。以下是一个示例程序:
```
const express = require('express');
const mysql = require('mysql');
const app = express();
const connection = mysql.createConnection({
host: 'localhost',
user: 'root',
password: 'password',
database: 'customer_service'
});
connection.connect((err) => {
if (err) {
console.error('Error connecting to database: ' + err.stack);
return;
}
console.log('Connected to database with ID: ' + connection.threadId);
});
app.use(express.json());
app.get('/customers', (req, res) => {
connection.query('SELECT * FROM customers', (err, results) => {
if (err) {
console.error('Error executing query: ' + err.stack);
res.status(500).send('Error executing query');
return;
}
res.send(results);
});
});
app.post('/customers', (req, res) => {
const { name, email, phone, message } = req.body;
connection.query('INSERT INTO customers (name, email, phone, message) VALUES (?, ?, ?, ?)', [name, email, phone, message], (err, results) => {
if (err) {
console.error('Error executing query: ' + err.stack);
res.status(500).send('Error executing query');
return;
}
res.send(results);
});
});
app.get('/orders', (req, res) => {
connection.query('SELECT * FROM orders', (err, results) => {
if (err) {
console.error('Error executing query: ' + err.stack);
res.status(500).send('Error executing query');
return;
}
res.send(results);
});
});
app.post('/orders', (req, res) => {
const { customer_id, product, quantity, price } = req.body;
connection.query('INSERT INTO orders (customer_id, product, quantity, price) VALUES (?, ?, ?, ?)', [customer_id, product, quantity, price], (err, results) => {
if (err) {
console.error('Error executing query: ' + err.stack);
res.status(500).send('Error executing query');
return;
}
res.send(results);
});
});
app.listen(3000, () => {
console.log('Server started on port 3000');
});
```
3. 创建Vue客户端程序
最后,可以创建一个Vue客户端程序,用于展示用户界面和发送HTTP请求。可以使用axios模块来发送HTTP请求,并使用Vue组件来创建用户界面。以下是一个示例程序:
```
<template>
<div>
<h2>Customer List</h2>
<table>
<thead>
<tr>
<th>Name</th>
<th>Email</th>
<th>Phone</th>
<th>Message</th>
<th>Date</th>
</tr>
</thead>
<tbody>
<tr v-for="customer in customers" :key="customer.id">
<td>{{ customer.name }}</td>
<td>{{ customer.email }}</td>
<td>{{ customer.phone }}</td>
<td>{{ customer.message }}</td>
<td>{{ customer.created_at }}</td>
</tr>
</tbody>
</table>
<h2>Order List</h2>
<table>
<thead>
<tr>
<th>Customer</th>
<th>Product</th>
<th>Quantity</th>
<th>Price</th>
<th>Date</th>
</tr>
</thead>
<tbody>
<tr v-for="order in orders" :key="order.id">
<td>{{ customers.find(c => c.id === order.customer_id).name }}</td>
<td>{{ order.product }}</td>
<td>{{ order.quantity }}</td>
<td>{{ order.price }}</td>
<td>{{ order.created_at }}</td>
</tr>
</tbody>
</table>
<form @submit.prevent="submit">
<h2>Contact Us</h2>
<div>
<label>Name:</label>
<input type="text" v-model="name" required>
</div>
<div>
<label>Email:</label>
<input type="email" v-model="email" required>
</div>
<div>
<label>Phone:</label>
<input type="tel" v-model="phone" required>
</div>
<div>
<label>Message:</label>
<textarea v-model="message" required></textarea>
</div>
<button type="submit">Submit</button>
</form>
</div>
</template>
<script>
import axios from 'axios';
export default {
data() {
return {
customers: [],
orders: [],
name: '',
email: '',
phone: '',
message: ''
};
},
mounted() {
axios.get('/customers').then(response => {
this.customers = response.data;
});
axios.get('/orders').then(response => {
this.orders = response.data;
});
},
methods: {
submit() {
axios.post('/customers', { name: this.name, email: this.email, phone: this.phone, message: this.message }).then(response => {
alert('Your message has been sent.');
this.name = '';
this.email = '';
this.phone = '';
this.message = '';
});
}
}
};
</script>
```
以上仅是一个简单的示例代码,实际的客服系统可能要更加复杂和完善,需要根据实际业务需求进行设计和开发。