nodejs sqlcipher

Node.js 是一个基于 Chrome V8 引擎的 JavaScript 运行环境，而 SQLCipher 是一个开源的 SQLite 加密库。

在Node.js中实现SQL拼接可以通过以下步骤完成：

1、导入必要的模块：你需要安装并导入mysql模块，它是Node.js中用于与MySQL数据库进行交互的常用模块，可以使用以下命令安装它：

npm install mysql

2、创建数据库连接：使用mysql.createConnection()方法创建一个数据库连接对象，你需要提供数据库的主机名、用户名、密码和数据库名称作为参数。

const mysql = require('mysql');
const connection = mysql.createConnection({
  host: 'localhost',
  user: 'your_username',
  password: 'your_password',
  database: 'your_database'
});

3、执行SQL查询：使用连接对象的query()方法执行SQL查询，你可以将要执行的SQL语句作为字符串传递给该方法。

const query = 'SELECT * FROM users';
connection.query(query, (error, results, fields) => {
  if (error) {
    console.error('Error executing query:', error);
    return;
  }
  console.log('Results:', results);
});

4、关闭数据库连接：在完成数据库操作后，记得关闭连接以释放资源，可以使用连接对象的end()方法来关闭连接。

connection.end();

单元表格：

SQL语句	Node.js代码
SELECT * FROM users	`const query = 'SELECT * FROM users'; connection.query(query, callback);`
INSERT INTO users (name, age) VALUES (‘John’, 25)	`const query = 'INSERT INTO users (name, age) VALUES ('John', 25)'; connection.query(query, callback);`
UPDATE users SET age = 30 WHERE name = ‘John’	`const query = 'UPDATE users SET age = 30 WHERE name = 'John''; connection.query(query, callback);`
DELETE FROM users WHERE id = 1	`const query = 'DELETE FROM users WHERE id = 1'; connection.query(query, callback);`
SELECT * FROM users WHERE age > 18	`const query = 'SELECT * FROM users WHERE age > 18'; connection.query(query, callback);`
SELECT * FROM users INNER JOIN orders ON users.id = orders.user_id	`const query = 'SELECT * FROM users INNER JOIN orders ON users.id = orders.user_id'; connection.query(query, callback);`
COUNT(*) FROM users	`const query = 'COUNT(*) FROM users'; connection.query(query, callback);`
LIKE %john%	`const query = 'SELECT * FROM users WHERE name LIKE '%john%''; connection.query(query, callback);`
AND & OR operators	`const query = 'SELECT * FROM users WHERE age > 18 AND name LIKE '%john%''; connection.query(query, callback);`
Order by clause	`const query = 'SELECT * FROM users ORDER BY age DESC'; connection.query(query, callback);`
Group by clause	`const query = 'SELECT age, COUNT(*) as count FROM users GROUP BY age'; connection.query(query, callback);`
Join multiple tables	`const query = 'SELECT * FROM users INNER JOIN orders ON users.id = orders.user_id INNER JOIN products ON orders.product_id = products.id'; connection.query(query, callback);`
Pagination	`const pageNumber = 1; const pageSize = 10; const offset = (pageNumber 1) * pageSize; const query =` SELECT * FROM users LIMIT ${offset}, ${pageSize}`; connection.query(query, callback);`