sequelize 更新多行

Question

更新多行，使用批量更新是一个好的解决方案还是类似于下面的代码？. 我想用 id 和文件名更新所有记录。我确实尝试在循环内更新，但迁移挂断并在此块中花费太长时间。是因为迭代吗？还是更新语法有问题？谢谢你。＃代码 for (let i = 0; i < documents.length; i++) {        const prefix = Date.now().toString();        const fileParts = documents[i].filename.split('.');        const finalname = `${fileParts[0]}-${prefix}.${fileParts[1]}`;        // eslint-disable-next-line no-await-in-loop        await queryInterface.sequelize.query(`UPDATE ${EmployeeDocumentsModel.tableName} SET filename='${finalname}' WHERE id=${documents[i].id};`, { transaction });      }＃代码module.exports = {  up: async (queryInterface) => {    const transaction = await queryInterface.sequelize.transaction();    try       const documents = await sequelizeClient.query(        `SELECT id, filename, COUNT(filename) FROM ${EmployeeDocumentsModel.tableName} GROUP BY filename      HAVING COUNT(filename) > 1;`,        { type: QueryTypes.SELECT },      );      // eslint-disable-next-line no-plusplus      for (let i = 0; i < documents.length; i++) {        const prefix = Date.now().toString();        const fileParts = documents[i].filename.split('.');        const finalname = `${fileParts[0]}-${prefix}.${fileParts[1]}`;        // eslint-disable-next-line no-await-in-loop        await queryInterface.sequelize.query(`UPDATE ${EmployeeDocumentsModel.tableName} SET filename='${finalname}' WHERE id=${documents[i].id};`, { transaction });      }      // eslint-disable-next-line no-unused-vars      // const file = await sequelizeClient.query(      //   `DELETE d1 from ${EmployeeDocumentsModel.tableName} d1 inner join ${EmployeeDocumentsModel.tableName} d2 on d2.id < d1.id and d2.filename = d1.filename and d2.employeeId = d1.employeeId`,      //   { type: QueryTypes.DELETE },      // );

Answer 1

我认为最大的问题是每次更新都在等待前一次完成：

for (let i = 0; i < documents.length; i++) {

    // ...

    await queryInterface.sequelize.query(`UPDATE ${EmployeeDocumentsModel.tableName} SET filename='${finalname}' WHERE id=${documents[i].id};`, { transaction });

}

如果将其更改为：

const promises = [];

for (let i = 0; i < documents.length; i++) {

    // ...

    promises.push(queryInterface.sequelize.query(`UPDATE ${EmployeeDocumentsModel.tableName} SET filename='${finalname}' WHERE id=${documents[i].id};`, { transaction }));

}

await Promise.all(promises);

你应该看到一个很大的加速。