如何使用 id 将两个表从一张表更新到另一张表？

Question

我正在编写一个 Node JS 脚本，我想用它来更新远程数据库中的 2 个表。 到目前为止，该脚本执行以下操作：

• 它连接到远程数据库，选择自给定时间以来的新值。
• 它连接到本地数据库，将新的/编辑过的行插入或更新到表 A。
• 使用表 A 中的 id 作为主键更新或插入新行到第二个表。 我已经完成了任务 1 和 2。

到目前为止我的代码：

let mysql = require('mysql');

let con = mysql.createConnection({ //Server A
    host: "192.168.1.10",
    user: "user1",
    password: "pswd1",
    database: "a_database"
});

let con2 = mysql.createConnection({ //Server B
    host: "192.168.1.11",
    user: "user2",
    password: "pswd2",
    database: "b_database"
});

let sqlSelectDatabaseA = "SELECT uid,name,email,city,street,number FROM users \n" +
    "WHERE uid IN (SELECT DISTINCT u.uid FROM logs l INNER JOIN users u ON l.id = u.uid ORDER BY uid;";

let sqlSelectId = "SELECT max(id) AS ID FROM addresses";

let sqlInsertUsers = "INSERT INTO users (username,email,mobile,city,street,client_number,contactAddress) VALUES ? ON DUPLICATE KEY UPDATE \n" +
"username=VALUES(username),email=VALUES(email),mobile=VALUES(mobile),city=VALUES(city),street=VALUES(street);"; //I've solved the insert/update in this sql command
let sqlInsertAddresses = "INSERT INTO addresses (country,city,street,number) VALUES ?"; //Here I would need update too

con.connect(async function(err) {
    if (err) throw err;
    con.query(sqlSelectDatabaseA, function (err, result) {
        if (err) throw err;
        con2.connect(function(err) {
            if (err) throw err;
            con2.query(sqlSelectId, function (err, result2) {
                if (err) throw err;
                let addressId = result2[0].ID;
                let values1 = [];
                let values2 = [];
                for (let i = 0; i < result.length; i++) {
                    addressId++;
                    values1[i] = [result[i].city,result[i].street,result[i].number];
                    values2[i] = [result[i].name,result[i].email,result[i].city,result[i].street + ' ' + result[i].number,result[i].uid,++addressId];
                }
                con2.query(sqlInsertAddresses, [values1], function (err, result3) {
                    if (err)
                        throw err;
                    console.log("Number of records inserted/updated in addresses table : " + result3.affectedRows); //Now I only insert the addresses, don't check them if they exist, this would be the task, to achieve a check if it exists or not, if exists, update it, if not, insert it
                    con2.query(sqlInsertUsers, [values2], function (err, result4) {
                        if (err) throw err;
                        console.log("Number of records inserted/updated in users table: " + result4.affectedRows);
                        con.end();
                        con2.end();
                    });
                });

            });

        });
    });
});

我想找到一个解决方案，将 users.contactAddress 中的值用作地址表上的主键。 如果具有给定主键的记录存在，则仅更新值，如果不存在，则插入新记录。

如果可能，没有新的 sql 命令。 但如果没有其他办法，那也行。

例子：

• 在日志表中出现了一个新行，它看起来像 |logId|userId|
• 该脚本使用该行的用户 ID，连接到数据库 A，从用户表中获取新值
• 脚本使用数据库 A 中的值插入或更新数据库 B 中的用户表
• 根据是否发生更新或插入，它向地址表添加一行，或更新地址表中的值，其中 id (PRIMARY KEY) 等于更新用户记录的 contactAddress 字段

数据库结构

CREATE TABLE IF NOT EXISTS usersA (
  `uid` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(255) NOT NULL,
  `email` varchar(255) NOT NULL,
  `mobile` varchar(255) NOT NULL,
  `city` varchar(255) NOT NULL,
  `street` varchar(255) NOT NULL,
  `number` bigint(20) NOT NULL,
  PRIMARY KEY (`uid`)
);
CREATE TABLE IF NOT EXISTS logsA (
  `logId` int(11) NOT NULL AUTO_INCREMENT,
  `userId` varchar(255) NOT NULL,
  PRIMARY KEY (`logId`)
);
CREATE TABLE IF NOT EXISTS addressesB (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `city` varchar(255) NOT NULL,
  `street` varchar(255) NOT NULL,
  `buildingNumber` varchar(255) NOT NULL, 
  PRIMARY KEY (`id`)
);
CREATE TABLE IF NOT EXISTS usersB (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(255) NOT NULL,
  `mobile` varchar(255) NOT NULL,
  `email` varchar(255) NOT NULL,
  `city` varchar(255) NOT NULL,
  `street` varchar(255) NOT NULL,
  `klient_number` bigint(20) NOT NULL,
  `contactAddress` bigint(20) NOT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `klient_number` (`klient_number`)
);
INSERT INTO usersA (username,email,mobile,city,street,number) VALUES("John Smith", "john.smith@gmail.com", "0000", "city", "street", 15);
INSERT INTO usersA (username,email,mobile,city,street,number) VALUES("Kate Smith", "kate.smith@gmail.com", "0000", "city_updated", "street1", 11);
INSERT INTO usersA (username,email,mobile,city,street,number) VALUES("Will Smith", "will.smith@gmail.com", "0000", "city2", "street2", 6);
INSERT INTO usersB (username,email,mobile,city,street,klient_number, contactAddress) VALUES("John Smith", "john.smith@gmail.com", "0000", "city", "street 15", 1, 1);
INSERT INTO usersB (username,email,mobile,city,street,klient_number, contactAddress) VALUES("Kate Smith", "kate.smith@gmail.com", "0000", "city 1", "street1 11", 2, 2);
INSERT INTO addressesB (city, street, buildingNumber) VALUES ("city", "street", "15");
INSERT INTO addressesB (city, street, buildingNumber) VALUES ("city 1", "street1", "11");
INSERT INTO logsA (userId) VALUES (2);
INSERT INTO logsA (userId) VALUES (3);

预期结果：脚本从 usersA 表中选择用户，检查 usersB 表中的用户。 如果在 usersA 表中存在与 PRIMARY KEY 具有相同 klient_number 的记录（因此，uid），则它会更新，否则它会插入。 它在地址表中做同样的事情。

感谢您的帮助！

Answer 1

也许你在追求这样的事情：

INSERT INTO usersB 
(username
,mobile
,email
,city
,street
,klient_number) 
SELECT username
     , mobile
     , email
     , city
     , CONCAT_WS(' ',street,number)
     , uid 
  FROM usersA a 
    ON DUPLICATE KEY 
UPDATE username = a.username
     , mobile = a.mobile
     , email = a.email
     , city = a.city
     , street = CONCAT_WS(' ',a.street,a.number)
     , klient_number = a.uid;

Query OK, 3 rows affected, 1 warning (0.00 sec)
Records: 3  Duplicates: 1  Warnings: 0

SELECT * FROM usersB;
+----+------------+--------+----------------------+--------------+------------+---------------+----------------+
| id | username   | mobile | email                | city         | street     | klient_number | contactAddress |
+----+------------+--------+----------------------+--------------+------------+---------------+----------------+
|  1 | John Smith | 0000   | john.smith@gmail.com | city         | street 15  |             1 |              1 |
|  2 | Kate Smith | 0000   | kate.smith@gmail.com | city_updated | street1 11 |             2 |              2 |
|  3 | Will Smith | 0000   | will.smith@gmail.com | city2        | street2 6  |             3 |              0 |
+----+------------+--------+----------------------+--------------+------------+---------------+----------------+