383 lines
11 KiB
TypeScript
383 lines
11 KiB
TypeScript
import type { ComparisonOperatorExpression, OperandValueExpressionOrList } from '../parser/binary-operation-parser.js';
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import type { ReferenceExpression } from '../parser/reference-parser.js';
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import type { SqlBool } from '../util/type-utils.js';
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import type { ExpressionOrFactory } from '../parser/expression-parser.js';
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export interface WhereInterface<DB, TB extends keyof DB> {
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/**
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* Adds a `where` expression to the query.
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*
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* Calling this method multiple times will combine the expressions using `and`.
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*
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* Also see {@link whereRef}
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*
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* ### Examples
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*
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* <!-- siteExample("where", "Simple where clause", 10) -->
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*
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* `where` method calls are combined with `AND`:
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*
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* ```ts
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* const person = await db
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* .selectFrom('person')
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* .selectAll()
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* .where('first_name', '=', 'Jennifer')
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* .where('age', '>', 40)
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* .executeTakeFirst()
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* ```
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*
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* The generated SQL (PostgreSQL):
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*
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* ```sql
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* select * from "person" where "first_name" = $1 and "age" > $2
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* ```
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*
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* Operator can be any supported operator or if the typings don't support it
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* you can always use:
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*
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* ```ts
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* import { sql } from 'kysely'
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*
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* sql`your operator`
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* ```
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*
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* <!-- siteExample("where", "Where in", 20) -->
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*
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* Find multiple items using a list of identifiers:
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*
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* ```ts
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* const persons = await db
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* .selectFrom('person')
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* .selectAll()
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* .where('id', 'in', [1, 2, 3])
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* .execute()
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* ```
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*
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* The generated SQL (PostgreSQL):
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*
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* ```sql
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* select * from "person" where "id" in ($1, $2, $3)
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* ```
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*
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* <!-- siteExample("where", "Object filter", 30) -->
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*
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* You can use the `and` function to create a simple equality
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* filter using an object
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*
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* ```ts
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* const persons = await db
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* .selectFrom('person')
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* .selectAll()
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* .where((eb) => eb.and({
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* first_name: 'Jennifer',
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* last_name: eb.ref('first_name')
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* }))
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* .execute()
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* ```
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*
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* The generated SQL (PostgreSQL):
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*
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* ```sql
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* select *
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* from "person"
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* where (
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* "first_name" = $1
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* and "last_name" = "first_name"
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* )
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* ```
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*
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* <!-- siteExample("where", "OR where", 40) -->
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*
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* To combine conditions using `OR`, you can use the expression builder.
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* There are two ways to create `OR` expressions. Both are shown in this
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* example:
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*
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* ```ts
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* const persons = await db
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* .selectFrom('person')
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* .selectAll()
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* // 1. Using the `or` method on the expression builder:
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* .where((eb) => eb.or([
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* eb('first_name', '=', 'Jennifer'),
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* eb('first_name', '=', 'Sylvester')
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* ]))
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* // 2. Chaining expressions using the `or` method on the
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* // created expressions:
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* .where((eb) =>
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* eb('last_name', '=', 'Aniston').or('last_name', '=', 'Stallone')
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* )
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* .execute()
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* ```
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*
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* The generated SQL (PostgreSQL):
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*
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* ```sql
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* select *
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* from "person"
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* where (
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* ("first_name" = $1 or "first_name" = $2)
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* and
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* ("last_name" = $3 or "last_name" = $4)
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* )
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* ```
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*
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* <!-- siteExample("where", "Conditional where calls", 50) -->
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*
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* You can add expressions conditionally like this:
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*
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* ```ts
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* import { Expression, SqlBool } from 'kysely'
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*
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* const firstName: string | undefined = 'Jennifer'
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* const lastName: string | undefined = 'Aniston'
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* const under18 = true
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* const over60 = true
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*
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* let query = db
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* .selectFrom('person')
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* .selectAll()
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*
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* if (firstName) {
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* // The query builder is immutable. Remember to reassign
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* // the result back to the query variable.
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* query = query.where('first_name', '=', firstName)
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* }
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*
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* if (lastName) {
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* query = query.where('last_name', '=', lastName)
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* }
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*
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* if (under18 || over60) {
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* // Conditional OR expressions can be added like this.
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* query = query.where((eb) => {
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* const ors: Expression<SqlBool>[] = []
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*
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* if (under18) {
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* ors.push(eb('age', '<', 18))
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* }
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*
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* if (over60) {
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* ors.push(eb('age', '>', 60))
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* }
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*
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* return eb.or(ors)
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* })
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* }
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*
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* const persons = await query.execute()
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* ```
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*
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* Both the first and third argument can also be arbitrary expressions like
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* subqueries. An expression can defined by passing a function and calling
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* the methods of the {@link ExpressionBuilder} passed to the callback:
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*
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* ```ts
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* const persons = await db
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* .selectFrom('person')
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* .selectAll()
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* .where(
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* (qb) => qb.selectFrom('pet')
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* .select('pet.name')
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* .whereRef('pet.owner_id', '=', 'person.id')
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* .limit(1),
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* '=',
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* 'Fluffy'
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* )
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* .execute()
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* ```
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*
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* The generated SQL (PostgreSQL):
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*
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* ```sql
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* select *
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* from "person"
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* where (
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* select "pet"."name"
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* from "pet"
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* where "pet"."owner_id" = "person"."id"
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* limit $1
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* ) = $2
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* ```
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*
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* A `where in` query can be built by using the `in` operator and an array
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* of values. The values in the array can also be expressions:
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*
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* ```ts
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* const persons = await db
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* .selectFrom('person')
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* .selectAll()
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* .where('person.id', 'in', [100, 200, 300])
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* .execute()
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* ```
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*
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* The generated SQL (PostgreSQL):
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*
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* ```sql
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* select * from "person" where "id" in ($1, $2, $3)
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* ```
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*
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* <!-- siteExample("where", "Complex where clause", 60) -->
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*
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* For complex `where` expressions you can pass in a single callback and
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* use the `ExpressionBuilder` to build your expression:
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*
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* ```ts
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* const firstName = 'Jennifer'
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* const maxAge = 60
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*
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* const persons = await db
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* .selectFrom('person')
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* .selectAll('person')
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* .where(({ eb, or, and, not, exists, selectFrom }) => and([
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* or([
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* eb('first_name', '=', firstName),
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* eb('age', '<', maxAge)
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* ]),
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* not(exists(
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* selectFrom('pet')
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* .select('pet.id')
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* .whereRef('pet.owner_id', '=', 'person.id')
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* ))
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* ]))
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* .execute()
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* ```
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*
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* The generated SQL (PostgreSQL):
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*
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* ```sql
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* select "person".*
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* from "person"
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* where (
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* (
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* "first_name" = $1
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* or "age" < $2
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* )
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* and not exists (
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* select "pet"."id" from "pet" where "pet"."owner_id" = "person"."id"
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* )
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* )
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* ```
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*
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* If everything else fails, you can always use the {@link sql} tag
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* as any of the arguments, including the operator:
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*
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* ```ts
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* import { sql } from 'kysely'
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*
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* const persons = await db
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* .selectFrom('person')
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* .selectAll()
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* .where(
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* sql<string>`coalesce(first_name, last_name)`,
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* 'like',
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* '%' + name + '%',
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* )
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* .execute()
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* ```
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*
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* The generated SQL (PostgreSQL):
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*
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* ```sql
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* select * from "person"
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* where coalesce(first_name, last_name) like $1
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* ```
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*
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* In all examples above the columns were known at compile time
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* (except for the raw {@link sql} expressions). By default kysely only
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* allows you to refer to columns that exist in the database **and**
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* can be referred to in the current query and context.
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*
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* Sometimes you may want to refer to columns that come from the user
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* input and thus are not available at compile time.
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*
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* You have two options, the {@link sql} tag or `db.dynamic`. The example below
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* uses both:
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*
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* ```ts
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* import { sql } from 'kysely'
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* const { ref } = db.dynamic
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*
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* const columnFromUserInput: string = 'id'
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*
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* const persons = await db
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* .selectFrom('person')
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* .selectAll()
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* .where(ref(columnFromUserInput), '=', 1)
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* .where(sql.id(columnFromUserInput), '=', 2)
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* .execute()
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* ```
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*/
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where<RE extends ReferenceExpression<DB, TB>, VE extends OperandValueExpressionOrList<DB, TB, RE>>(lhs: RE, op: ComparisonOperatorExpression, rhs: VE): WhereInterface<DB, TB>;
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where<E extends ExpressionOrFactory<DB, TB, SqlBool>>(expression: E): WhereInterface<DB, TB>;
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/**
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* Adds a `where` clause where both sides of the operator are references
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* to columns.
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*
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* The normal `where` method treats the right hand side argument as a
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* value by default. `whereRef` treats it as a column reference. This method is
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* expecially useful with joins and correlated subqueries.
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*
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* ### Examples
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*
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* Usage with a join:
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*
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* ```ts
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* db.selectFrom(['person', 'pet'])
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* .selectAll()
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* .whereRef('person.first_name', '=', 'pet.name')
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* ```
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*
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* The generated SQL (PostgreSQL):
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*
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* ```sql
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* select * from "person", "pet" where "person"."first_name" = "pet"."name"
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* ```
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*
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* Usage in a subquery:
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*
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* ```ts
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* const persons = await db
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* .selectFrom('person')
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* .selectAll('person')
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* .select((eb) => eb
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* .selectFrom('pet')
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* .select('name')
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* .whereRef('pet.owner_id', '=', 'person.id')
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* .limit(1)
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* .as('pet_name')
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* )
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* .execute()
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* ```
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*
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* The generated SQL (PostgreSQL):
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*
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* ```sql
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* select "person".*, (
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* select "name"
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* from "pet"
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* where "pet"."owner_id" = "person"."id"
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* limit $1
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* ) as "pet_name"
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* from "person"
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*/
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whereRef<LRE extends ReferenceExpression<DB, TB>, RRE extends ReferenceExpression<DB, TB>>(lhs: LRE, op: ComparisonOperatorExpression, rhs: RRE): WhereInterface<DB, TB>;
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/**
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* Clears all where expressions from the query.
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*
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* ### Examples
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*
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* ```ts
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* db.selectFrom('person')
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* .selectAll()
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* .where('id','=',42)
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* .clearWhere()
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* ```
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*
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* The generated SQL(PostgreSQL):
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*
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* ```sql
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* select * from "person"
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* ```
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*/
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clearWhere(): WhereInterface<DB, TB>;
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}
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