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Query Methods

setAdapter(adapter)

Sets adapter to given one

getAdapter()

Returns currently set Adapter instance

setCollection(collection)

Sets collection to given one

expr()

Read more in Expression section.

Returns a new Expression object

func()

Read more in Functions section.

Returns a new Functions object

all()

Returns a promise, resolving with an array of results after execution

first()

Returns a promise, resolving with with a single object result after execution

run()

Returns a promise, with the direct result of execution

toModels(results)

Converts results to model(s), if query is for a Collection

toModel(result)

Alias to .toModels()

tap(fn)

Taps into the query builder chain, so you can perform something in between.

Example:

db.query()
  .select('id', 'title')
  .tap(function () {
    // `this` is the Query object here
  })
  .run()

select()

Selects columns to be fetched.

Can be called in various ways.

Array
query.select(['id', 'title']);
Arguments
query.select('id', 'title');
Object
query.select('id', {
  someTitle: 'title' //
}); // `SELECT id, title as someTitle`

Function

query.select('id', function (column) {
  return column('title')
    .upper()
    .trim();
}); // `SELET id, TRIM(UPPER(title))`

Read more about column Functions in its own section.

distinct(fields)

Selects DISTINCT columns given as an array

from (table, alias = null)

Specify the table where to fetch results from

  • .from('users') would result in SELECT * FROM users
  • .from('users', 'User') would result in SELECT * FROM users AS User

table(table)

Not all query operations are SELECTs, but still require setting a table.

.table() can be used in those scenarios.

where()

Sets conditions to the Query object.

Conditions can be set in various ways. For e.g, the same query for finding results where id = 1 can be written as follows:

Plain object:

query.where({
  id: 1
});

Function:

query.where(function (expr) {
  // `expr` is an Expression object here
  expr.eq('id', 1);
});

Read more about Expressions in its own section.

andWhere()

Same as .where() but with AND operator

orWhere()

Same as .where() but with OR operator

notWhere()

Same as .where() but with NOT operator

limit(number)

Limit query results

page(number)

Call it only if .limit() was called before.

Paginates results to certain page.

offset(number)

Offsets results. Do not use it together with .page().

orderBy(name, direction)

Accepts options in two ways:

Arguments

query.orderBy('created', 'asc');

*Object

query.orderBy({
  created: 'asc'
});

groupBy(column)

Groups results set by given column.

Can be a string or an array of columns.

count()

Count the number of results

Example:

query
  .from('users')
  .where({active: 1})
  .count()
  .run()
  .then(function (count) {
    // `count` is an integer here
  });

truncate()

Empties a table.

create(row)

Insert a single or multiple objects into the table

update(row)

Update with given row

delete()

Delete records based on current Query conditions

join(options)

Base method for joining tables.

For example, a LEFT join:

query
  .select('*')
  .from('posts', 'Post')
  .join({
    type: 'LEFT',
    table: 'authors',
    alias: 'Author',
    on: function (expr) {
      expr.eq('Post.author_id', 'Author.id');
    }
  })
  .run()

You can also pass nest: true to avoid overriding column values, by returning the results nested per table.

There are also other handy methods for various kinds of JOINs

innerJoin(options)

Wrapper for INNER join.

leftJoin(options)

Wrapper for LEFT join.

leftOuterJoin(options)

Wrapper for LEFT OUTER join.

rightJoin(options)

Wrapper for RIGHT join.

rightOuterJoin(options)

Wrapper for RIGHT OUTER join.

outerJoin(options)

Wrapper for OUTER join.

fullOuterJoin(options)

Wrapper for FULL OUTER join.

debug()

Prints out the currently developed Query as a string in console

transact(t)

Returns self for further chaining.

Read more in Transaction section.