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Query methods

Each query method does not mutate the query chain, so calling it conditionally won't have an effect:

ts
let query = db.table.select('id', 'name');

// WRONG: won't have effect
if (params.name) {
  query.where({ name: params.name });
}

// CORRECT: reassign `query` variable
if (params.name) {
  query = query.where({ name: params.name });
}

const results = await query;

Each query method has a mutating pair starting with _:

ts
const query = db.table.select('id', 'name');

// Calling mutating method `_where`:
if (params.name) {
  query._where({ name: params.name });
}

const results = await query;

Mutating methods started with _ are used internally, however, their use is not recommended because it would be easier to make mistakes, code will be less obvious.

NotFoundError handling

When we search for a single record, and it is not found, it can either throw an error, or return undefined.

Unlike other database libraries, Orchid ORM decided to throw errors by default when using methods take, find, findBy, get and the record is not found. It is a good practice to catch common errors in a centralized place (see global error handling), and this allows for a more concise code.

If it's more suitable to get the undefined value instead of throwing, use takeOptional, findOptional, findByOptional, getOptional instead.

take and takeOptional

Takes a single record, adds LIMIT 1.

take throws a NotFoundError when not found, and takeOptional returns undefined.

ts
const taken: TableType = await db.table.where({ key: 'value' }).take();

const takenOptional: TableType | undefined = await db.table
  .where({ key: 'value' })
  .takeOptional();

find

Finds a single record by the primary key (id), throws NotFoundError if not found. Not available if the table has no or multiple primary keys.

ts
const result: TableType = await db.table.find(1);

findOptional

Finds a single record by the primary key (id), returns undefined when not found. Not available if the table has no or multiple primary keys.

ts
const result: TableType | undefined = await db.table.find(123);

findBy

Finds a single unique record, throws NotFoundError if not found. It accepts values of primary keys or unique indexes defined on the table. findBy's argument type is a union of all possible sets of unique conditions.

You can use where(...).take() for non-unique conditions.

ts
await db.table.findBy({ key: 'value' });

findByOptional

Finds a single unique record, returns undefined if not found. It accepts values of primary keys or unique indexes defined on the table. findBy's argument type is a union of all possible sets of unique conditions.

You can use where(...).takeOptional() for non-unique conditions.

ts
await db.table.findByOptional({ key: 'value' });

findBySql

Finds a single record with a given SQL, throws NotFoundError if not found:

ts
await db.user.find`
  age = ${age} AND
  name = ${name}
`;

findBySqlOptional

Finds a single record with a given SQL. Returns undefined when not found.

ts
await db.user.find`
  age = ${age} AND
  name = ${name}
`;

get and getOptional

.get returns a single value, adds LIMIT 1 to the query, and accepts a column name or a raw SQL expression.

get throws a NotFoundError when not found, and getOptional returns undefined.

ts
import { NumberColumn } from 'orchid-orm';
import { sql } from './baseTable';

const firstName: string = await db.table.get('name');

const rawResult: number = await db.table.get(sql((t) => t.integer())`1 + 1`);

const firstNameOptional: string | undefined = await db.table.getOptional(
  'name',
);

rows

.rows returns an array of arrays without field names:

ts
const rows: Array<Array<number | string>> = await db.table
  .select('id', 'name')
  .rows();

rows.forEach((row) => {
  // row is array of column values
  row.forEach((value) => {
    // value is an id or a name
  });
});

pluck

.pluck returns a single array of a single selected column values:

ts
const ids = await db.table.pluck('id');
// ids are an array of all users' id like [1, 2, 3]

exec

.exec won't parse the response at all, and returns undefined:

ts
const nothing = await db.table.take().exec();

all

.all is a default behavior, that returns an array of objects:

ts
const records = db.table
  .take() // .take() will be overridden by .all()
  .all();

none

none will resolve the query into an empty result, without executing a database query.

ts
await db.table.none(); // -> empty array
await db.table.findOptional(123).none(); // -> undefined
await db.table.find(123).none(); // throws NotFoundError

insert, update, and delete are returning a count of affected records.

When they are called with none, query does not execute and 0 is returned.

ts
await db.table.insert(data).none(); // -> 0
await db.table.all().update(data).none(); // -> 0
await db.table.all().delete().none(); // -> 0

select

Takes a list of columns to be selected, and by default, the query builder will select all columns of the table.

The last argument can be an object. Keys of the object are column aliases, value can be a column name, sub-query, or raw SQL expression.

ts
// select columns of the table:
db.table.select('id', 'name', { idAlias: 'id' });

// accepts columns with table names:
db.table.select('user.id', 'user.name', { nameAlias: 'user.name' });

// table name may refer to the current table or a joined table:
db.table
  .join(Message, 'authorId', 'id')
  .select('user.name', 'message.text', { textAlias: 'message.text' });

// select value from the sub-query,
// this sub-query should return a single record and a single column:
db.table.select({
  subQueryResult: Otherdb.table.select('column').take(),
});

// select raw SQL value, specify the returning type via <generic> syntax:
db.table.select({
  raw: sql<number>`1 + 2`,
});

// select raw SQL value, the resulting type can be set by providing a column type in such way:
db.table.select({
  raw: sql`1 + 2`.type((t) => t.integer()),
});

// same raw SQL query as above, but raw value is returned from a callback
db.table.select({
  raw: (q) => q.sql`1 + 2`.type((t) => t.integer()),
});

When you use the ORM and defined relations, select can also accept callbacks with related table queries:

ts
await db.author.select({
  allBooks: (q) => q.books,
  firstBook: (q) => q.books.order({ createdAt: 'ASC' }).take(),
  booksCount: (q) => q.books.count(),
});

When you're selecting a relation that's connected via belongsTo or hasOne, it becomes available to use in order or in where:

ts
// select books with their authors included, order by author name and filter by author column:
await db.books
  .select({
    author: (q) => q.author,
  })
  .order('author.name')
  .where({ 'author.isPopular': true });

selectAll

When querying the table or creating records, all columns are selected by default, but updating and deleting queries are returning affected row counts by default.

Use selectAll to select all columns. If the .select method was applied before it will be discarded.

ts
const selectFull = await db.table
  .select('id', 'name') // discarded by `selectAll`
  .selectAll();

const updatedFull = await db.table.selectAll().where(conditions).update(data);

const deletedFull = await db.table.selectAll().where(conditions).delete();

distinct

Adds a DISTINCT keyword to SELECT:

ts
db.table.distinct().select('name');

Can accept column names or raw SQL expressions to place it to DISTINCT ON (...):

ts
import { sql } from './baseTable';

// Distinct on the name and raw SQL
db.table.distinct('name', sql`raw sql`).select('id', 'name');

as

Sets table alias:

ts
db.table.as('u').select('u.name');

// Can be used in the join:
db.table.join(Profile.as('p'), 'p.userId', 'user.id');

from

Set the FROM value, by default the table name is used.

from determines a set of available tables and columns withing the query, and thus it must not follow select, use select only after from.

ts
// accepts sub-query:
db.table.from(db.otherTable.select('foo', 'bar'));

// accepts alias of `WITH` expression:
q.with('withTable', db.table.select('id', 'name'))
  .from('withTable')
  // `select` is after `from`
  .select('id', 'name');

from can accept multiple sources:

ts
db.table
  // add a `WITH` statement called `withTable
  .with('withTable', db.table.select('one'))
  // select from `withTable` and from `otherTable`
  .from('withTable', db.otherTable.select('two'))
  // source names and column names are properly typed when selecting
  .select('withTable.one', 'otherTable.two');

fromSql

Set the FROM value with custom SQL:

ts
const value = 123;
db.table.fromSql`value = ${value}`;

only

Adds ONLY SQL keyword to the FROM. When selecting from a parent table that has a table inheritance, setting only will make it to select rows only from the parent table.

ts
db.table.only();

// disabling `only` after being enabled
db.table.only().only(false);

offset

Adds an offset clause to the query.

ts
db.table.offset(10);

limit

Adds a limit clause to the query.

ts
db.table.limit(10);

truncate

Truncates the specified table.

ts
// simply truncate
await db.table.truncate();

// restart autoincrementing columns:
await db.table.truncate({ restartIdentity: true });

// truncate also dependant tables:
await db.table.truncate({ cascade: true });

clone

Clones the current query chain, useful for re-using partial query snippets in other queries without mutating the original.

Used under the hood, and not really needed on the app side.

group

For the GROUP BY SQL statement, it is accepting column names or raw SQL expressions.

group is useful when aggregating values.

ts
// Select the category and sum of prices grouped by the category
const results = db.product
  .select('category')
  .selectSum('price', { as: 'sumPrice' })
  .group('category');

Also, it's possible to group by a selected value:

ts
import { sql } from './baseTable';

const results = db.product
  .select({
    month: sql`extract(month from "createdAt")`.type((t) =>
      // month is returned as string, parse it to int
      t.string().parse(parseInt),
    ),
  })
  .selectSum('price', { as: 'sumPrice' })
  // group by month extracted from "createdAt"
  .group('month');

order

Adds an order by clause to the query.

Takes one or more arguments, each argument can be a column name or an object

ts
db.table.order('id', 'name'); // ASC by default

db.table.order({
  id: 'ASC', // or DESC

  // to set nulls order:
  name: 'ASC NULLS FIRST',
  age: 'DESC NULLS LAST',
});

order can refer to the values returned from select sub-queries (unlike where which cannot). So you can select a count of related records and order by it.

For example, comment has many likes. We are selecting few columns of comment, selecting likesCount by a sub-query in a select, and ordering comments by likes count:

ts
db.comment
  .select('title', 'content', {
    likesCount: (q) => q.likes.count(),
  })
  .order({
    likesCount: 'DESC',
  });

orderSql

Order by raw SQL expression.

ts
db.table.orderSql`raw sql`;

having

Build a HAVING clause to the query to filter records by results of aggregate functions.

The argument of having is a function where you call the aggregate function and compare it with some value by using column operators.

ts
db.table.having((q) => q.count().gte(10));
// HAVING count(*) >= 10

Multiple having conditions will be combined with AND:

ts
db.table.having(
  (q) => q.sum('column').gt(5),
  (q) => q.avg('column').lt(10),
);
// HAVING sum(column) > 5 AND avg(column) < 10

After applying a comparison, or and and methods become available:

ts
db.table.having((q) =>
  q.sum('column').equals(5).or(q.min('column').gt(1), q.max('column').lt(10)),
);
// HAVING (sum(column) = 5) OR (min(column) > 1 AND max(column) < 10)

Aggregate functions are exactly the same functions described in aggregate functions, they can accept aggregation options:

ts
db.table.having((q) =>
  q
    .count('id', {
      distinct: true,
      order: { createdAt: 'DESC', filter: { someColumn: { not: null } } },
    })
    .gte(10),
);

Arguments of the aggregate function and of the comparison can be raw SQL:

ts
db.table.having((q) => q.count(q.sql('coalesce(one, two)')).gte(q.sql`2 + 2`));

havingSql

Provide SQL expression for the HAVING SQL statement:

ts
db.table.havingSql`count(*) >= ${10}`;

transform

Transform the result of the query right after loading it.

transform method should be called in the last order, other methods can't be chained after calling it.

The hooks that are going to run after the query will receive the query result before transformation.

Consider the following example of a cursor-based pagination by id:

ts
const lastId: number | undefined = req.query.cursor;

type Result = {
  nodes: { id: number; text: string }[];
  cursor?: number;
};

// result is only for demo, it will be inferred
const posts: Result = await db.post
  .select('id', 'text')
  .where({ id: { lt: lastId } })
  .order({ id: 'DESC' })
  .limit(100)
  .transform((nodes) => ({ nodes, cursor: nodes.at(-1)?.id }));

You can also use the tranform on nested sub-queries:

ts
type Result = {
  nodes: {
    id: number;
    text: string;
    comments: { nodes: { id: number; text: string }[]; cursor?: number };
  }[];
  cursor?: number;
};

const postsWithComments: Result = await db.post
  .select('id', 'text')
  .select({
    comments: (q) =>
      q.comments
        .select('id', 'text')
        .transform((nodes) => ({ nodes, cursor: nodes.at(-1)?.id })),
  })
  .transform((nodes) => ({ nodes, cursor: nodes.at(-1)?.id }));

narrowType

Narrows a part of the query output type. Use with caution, type-safety isn't guaranteed with it. This is similar so using as keyword from TypeScript, except that it applies only to a part of the result.

The syntax ()<{ ... }>() is enforced by internal limitations.

ts
const rows = db.table
  // filter out records where the `nullableColumn` is null
  .where({ nullableColumn: { not: null } });
  // narrows only a specified column, the rest of result is unchanged
  .narrowType()<{ nullableColumn: string }>()

// the column had type `string | null`, now it is `string`
rows[0].nullableColumn

// imagine that table has a enum column kind with variants 'first' | 'second'
// and a boolean `approved`
db.table
  .where({ kind: 'first', approved: true })
  // after applying such `where`, it's safe to narrow the type to receive the literal values
  .narrowType()<{ kind: 'first', approved: true }>();

log

Override the log option, which can also be set in createDb or when creating a table instance:

ts
// turn log on for this query:
await db.table.all().log(true);
await db.table.all().log(); // no argument for true

// turn log off for this query:
await db.table.all().log(false);

clear

Clears the specified operator from the query, and accepts one or more string keys.

The clear key can be one of the following:

  • with
  • select
  • where
  • union
  • using
  • join
  • group
  • order
  • having
  • limit
  • offset
  • counters: removes increment and decrement

Note that currently, it does not affect on resulting TypeScript type, it may be improved in the future.

ts
// Clears select statement but the resulting type still has the `id` column selected.
db.table.select('id').clear('id');

merge

Merge two queries into one, with a decent type safety:

ts
const query1 = db.table.select('id').where({ id: 1 });
const query2 = db.table.select('name').where({ name: 'name' });

// result has a proper type { id: number, name: string }
const result = await query1.merge(query2).take();

Main info such as table name, and column types, will not be overridden by .merge(query), but all other query data will be merged if possible (select, where, join, with, and many others), or will be used from provided query argument if not possible to merge (as, onConflict, returning one or many).

modify

modify allows modifying the query with your function:

ts
const doSomethingWithQuery = (q: typeof db.table) => {
  // can use all query methods
  return q.select('name').where({ active: true }).order({ createdAt: 'DESC' });
};

const record = await db.table.select('id').modify(doSomethingWithQuery).find(1);

record.id; // id was selected before `modify`
record.name; // name was selected by the function

It's possible to apply different selects inside the function, and then the result type will be a union of all possibilities:

Use this sparingly as it complicates dealing with the result.

ts
const doSomethingWithQuery = (q: typeof db.table) => {
  if (Math.random() > 0.5) {
    return q.select('one');
  } else {
    return q.select('two');
  }
};

const record = await db.table.modify(doSomethingWithQuery).find(1);

// TS error: we don't know for sure if the `one` was selected.
record.one;

// use `in` operator to disambiguate the result type
if ('one' in record) {
  record.one;
} else {
  record.two;
}

makeHelper

Use makeHelper to make a query helper - a function where you can modify the query, and reuse this function across different places.

ts
const defaultAuthorSelect = db.author.makeHelper((q) => {
  return q.select('firstName', 'lastName');
});

// this will select id, firstName, lastName with a correct TS type
// and return a single record
const result = await defaultAuthorSelect(db.author.select('id').find(1));

Such helper is available for relation queries inside select:

ts
await db.book.select({
  author: (book) => defaultAuthorSelect(book.author),
});

Helper can accept additional arguments:

ts
const selectFollowing = db.user.makeHelper((q, currentUser: { id: number }) => {
  return q.select({
    following: (q) =>
      q.followers.where({ followerId: currentUser.id }).exists(),
  });
});

// select some columns and the `following` boolean field from users
await selectFollowing(db.user.select('id', 'name'), currentUser);

To get the result type of query helper, use QueryHelperResult type:

ts
import { QueryHelperResult } from 'orchid-orm';

const selectHelper = db.table.makeHelper((q) => q.select('id', 'name'));

// This type is identical to `db.table.select('id', 'name')`
type SelectQuery = QueryHelperResult<typeof selectHelper>;

// Await to get result, the type is `{ id: number, name: string }[]`
type Result = Awaited<QueryHelperResult<typeof selectHelper>>;

toSQL

Call toSQL on a query to get an object with a text SQL string and a values array of binding values:

ts
const sql = db.table.select('id', 'name').where({ name: 'name' }).toSQL();

expect(sql.text).toBe(
  'SELECT "table"."id", "table"."name" FROM "table" WHERE "table"."name" = $1',
);
expect(sql.values).toEqual(['name']);

toSQL is called internally when awaiting a query.

It is caching the result. Not mutating query methods are resetting the cache, but need to be careful with mutating methods that start with _ - they won't reset the cache, which may lead to unwanted results.

toSQL optionally accepts such parameters:

ts
type ToSqlOptions = {
  clearCache?: true;
  values?: [];
};