TypeORM toSQL - JavaScript

TypeORM toSQL is a powerful tool for generating SQL statements based on your TypeORM entities. It provides a useful way to test out queries and quickly generate SQL code without having to manually write it.

Installation

TypeORM toSQL can be installed using npm. Run the following command to install the package:

npm install typeorm-tosql

Usage

To use TypeORM toSQL, you will need to first create your TypeORM entities. Once your entities are defined, you can use the toSQL method provided by the package to generate your SQL statements. Here is an example:

import { createConnection } from 'typeorm';
import { Post } from './entity/Post';
import toSQL from 'typeorm-tosql';

createConnection().then(async (connection) => {
  const postRepo = connection.getRepository(Post);

  const query = postRepo.createQueryBuilder()
    .select('title')
    .addSelect('COUNT(*)', 'count')
    .groupBy('title')
    .having('COUNT(*) > 1')
    .orderBy('count');

  const sql = await toSQL(query);
  console.log(sql);
})
.catch((error) => {
  console.log(error);
});

In this example, we first imported the createConnection function from TypeORM and the toSQL function from the typeorm-tosql package. We then created a connection to our database and retrieved a repository for our Post entity.

Next, we created a query using the createQueryBuilder method provided by TypeORM. This query selects the title column from our Post entity and counts the number of times each title appears. It then filters out any titles that only appear once and orders the results by count in ascending order.

Finally, we passed our query to the toSQL function provided by the typeorm-tosql package. This function returns the generated SQL code for our query, which we log to the console.

Conclusion

TypeORM toSQL is a powerful tool for quickly generating SQL code based on your TypeORM entities. By using this package, you can save time and avoid errors that can occur when manually writing SQL statements.