UPDATE

以下示例也适用于 execute 方法。

¥The examples below also work for the execute method.

query(sql)

query(sql: string)

promise.js

try {
  const sql = 'UPDATE `users` SET `age` = 20 WHERE `name` = "Josh" LIMIT 1';

  const [result, fields] = await connection.query(sql);

  console.log(result);
  console.log(fields);
} catch (err) {
  console.log(err);
}

callback.js

const sql = 'UPDATE `users` SET `age` = 20 WHERE `name` = "Josh" LIMIT 1';

connection.query(sql, (err, result, fields) => {
  if (err instanceof Error) {
    console.log(err);
    return;
  }

  console.log(result);
  console.log(fields);
});

• 结果：包含 ResultSetHeader 对象，该对象提供有关服务器执行的操作的详细信息。

  ¥result: contains a ResultSetHeader object, which provides details about the operation executed by the server.

• fields 包含有关操作的额外元数据（如果可用）

  ¥fields contains extra meta data about the operation, if available

信息

用于查询（.query()）的连接可以通过 createConnection、createPool 或 createPoolCluster 方法获得。

¥The connection used for the query (.query()) can be obtained through the createConnection, createPool or createPoolCluster methods.

---

query(options)

query(options: QueryOptions)

promise.js

try {
  const sql = 'UPDATE `users` SET `age` = 20 WHERE `name` = "Josh" LIMIT 1';

  const [result, fields] = await connection.query({
    sql,
    // ... other options
  });

  console.log(result);
  console.log(fields);
} catch (err) {
  console.log(err);
}

callback.js

const sql = 'UPDATE `users` SET `age` = 20 WHERE `name` = "Josh" LIMIT 1';

connection.query(
  {
    sql,
    // ... other options
  },
  (err, result, fields) => {
    if (err instanceof Error) {
      console.log(err);
      return;
    }

    console.log(result);
    console.log(fields);
  }
);

• 结果：包含 ResultSetHeader 对象，该对象提供有关服务器执行的操作的详细信息。

  ¥result: contains a ResultSetHeader object, which provides details about the operation executed by the server.

• fields 包含有关操作的额外元数据（如果可用）

  ¥fields contains extra meta data about the operation, if available

信息

用于查询（.query()）的连接可以通过 createConnection、createPool 或 createPoolCluster 方法获得。

¥The connection used for the query (.query()) can be obtained through the createConnection, createPool or createPoolCluster methods.

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词汇表

¥Glossary

ResultSetHeader

ResultSetHeader Specification

QueryOptions

QueryOptions Specification