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QueryExpressionMap.ts
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QueryExpressionMap.ts
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import { Alias } from "./Alias"
import { ObjectLiteral } from "../common/ObjectLiteral"
import { OrderByCondition } from "../find-options/OrderByCondition"
import { JoinAttribute } from "./JoinAttribute"
import { QueryBuilder } from "./QueryBuilder"
import { QueryBuilderCteOptions } from "./QueryBuilderCte"
import { RelationIdAttribute } from "./relation-id/RelationIdAttribute"
import { RelationCountAttribute } from "./relation-count/RelationCountAttribute"
import { DataSource } from "../data-source/DataSource"
import { EntityMetadata } from "../metadata/EntityMetadata"
import { SelectQuery } from "./SelectQuery"
import { ColumnMetadata } from "../metadata/ColumnMetadata"
import { RelationMetadata } from "../metadata/RelationMetadata"
import { SelectQueryBuilderOption } from "./SelectQueryBuilderOption"
import { TypeORMError } from "../error"
import { WhereClause } from "./WhereClause"
/**
* Contains all properties of the QueryBuilder that needs to be build a final query.
*/
export class QueryExpressionMap {
// -------------------------------------------------------------------------
// Public Properties
// -------------------------------------------------------------------------
/**
* Strategy to load relations.
*/
relationLoadStrategy: "join" | "query" = "join"
/**
* Indicates if QueryBuilder used to select entities and not a raw results.
*/
queryEntity: boolean = false
/**
* Main alias is a main selection object selected by QueryBuilder.
*/
mainAlias?: Alias
/**
* All aliases (including main alias) used in the query.
*/
aliases: Alias[] = []
/**
* Represents query type. QueryBuilder is able to build SELECT, UPDATE and DELETE queries.
*/
queryType:
| "select"
| "update"
| "delete"
| "insert"
| "relation"
| "soft-delete"
| "restore" = "select"
/**
* Data needs to be SELECT-ed.
*/
selects: SelectQuery[] = []
/**
* Max execution time in millisecond.
*/
maxExecutionTime: number = 0
/**
* Whether SELECT is DISTINCT.
*/
selectDistinct: boolean = false
/**
* SELECT DISTINCT ON query (postgres).
*/
selectDistinctOn: string[] = []
/**
* FROM-s to be selected.
*/
// froms: { target: string, alias: string }[] = [];
/**
* If update query was used, it needs "update set" - properties which will be updated by this query.
* If insert query was used, it needs "insert set" - values that needs to be inserted.
*/
valuesSet?: ObjectLiteral | ObjectLiteral[]
/**
* Optional returning (or output) clause for insert, update or delete queries.
*/
returning: string | string[]
/**
* Extra returning columns to be added to the returning statement if driver supports it.
*/
extraReturningColumns: ColumnMetadata[] = []
/**
* Optional on conflict statement used in insertion query in postgres.
*/
onConflict: string = ""
/**
* Optional on ignore statement used in insertion query in databases.
*/
onIgnore: boolean = false
/**
* Optional on update statement used in insertion query in databases.
*/
onUpdate: {
conflict?: string | string[]
columns?: string[]
overwrite?: string[]
skipUpdateIfNoValuesChanged?: boolean
}
/**
* JOIN queries.
*/
joinAttributes: JoinAttribute[] = []
/**
* RelationId queries.
*/
relationIdAttributes: RelationIdAttribute[] = []
/**
* Relation count queries.
*/
relationCountAttributes: RelationCountAttribute[] = []
/**
* WHERE queries.
*/
wheres: WhereClause[] = []
/**
* HAVING queries.
*/
havings: { type: "simple" | "and" | "or"; condition: string }[] = []
/**
* ORDER BY queries.
*/
orderBys: OrderByCondition = {}
/**
* GROUP BY queries.
*/
groupBys: string[] = []
/**
* LIMIT query.
*/
limit?: number
/**
* OFFSET query.
*/
offset?: number
/**
* Number of rows to skip of result using pagination.
*/
skip?: number
/**
* Number of rows to take using pagination.
*/
take?: number
/**
* Use certain index for the query.
*
* SELECT * FROM table_name USE INDEX (col1_index, col2_index) WHERE col1=1 AND col2=2 AND col3=3;
*/
useIndex?: string
/**
* Locking mode.
*/
lockMode?:
| "optimistic"
| "pessimistic_read"
| "pessimistic_write"
| "dirty_read"
| "pessimistic_partial_write"
| "pessimistic_write_or_fail"
| "for_no_key_update"
| "for_key_share"
/**
* Current version of the entity, used for locking.
*/
lockVersion?: number | Date
/**
* Tables to be specified in the "FOR UPDATE OF" clause, referred by their alias
*/
lockTables?: string[]
/**
* Indicates if soft-deleted rows should be included in entity result.
* By default the soft-deleted rows are not included.
*/
withDeleted: boolean = false
/**
* Parameters used to be escaped in final query.
*/
parameters: ObjectLiteral = {}
/**
* Indicates if alias, table names and column names will be ecaped by driver, or not.
*
* todo: rename to isQuotingDisabled, also think if it should be named "escaping"
*/
disableEscaping: boolean = true
/**
* Indicates if virtual columns should be included in entity result.
*
* todo: what to do with it? is it properly used? what about persistence?
*/
enableRelationIdValues: boolean = false
/**
* Extra where condition appended to the end of original where conditions with AND keyword.
* Original condition will be wrapped into brackets.
*/
extraAppendedAndWhereCondition: string = ""
/**
* Indicates if query builder creates a subquery.
*/
subQuery: boolean = false
/**
* Indicates if property names are prefixed with alias names during property replacement.
* By default this is enabled, however we need this because aliases are not supported in UPDATE and DELETE queries,
* but user can use them in WHERE expressions.
*/
aliasNamePrefixingEnabled: boolean = true
/**
* Indicates if query result cache is enabled or not.
*/
cache: boolean = false
/**
* Time in milliseconds in which cache will expire.
* If not set then global caching time will be used.
*/
cacheDuration: number
/**
* Cache id.
* Used to identifier your cache queries.
*/
cacheId: string
/**
* Options that define QueryBuilder behaviour.
*/
options: SelectQueryBuilderOption[] = []
/**
* Property path of relation to work with.
* Used in relational query builder.
*/
relationPropertyPath: string
/**
* Entity (target) which relations will be updated.
*/
of: any | any[]
/**
* List of columns where data should be inserted.
* Used in INSERT query.
*/
insertColumns: string[] = []
/**
* Used if user wants to update or delete a specific entities.
*/
whereEntities: ObjectLiteral[] = []
/**
* Indicates if entity must be updated after insertion / updation.
* This may produce extra query or use RETURNING / OUTPUT statement (depend on database).
*/
updateEntity: boolean = true
/**
* Indicates if listeners and subscribers must be called before and after query execution.
*/
callListeners: boolean = true
/**
* Indicates if query must be wrapped into transaction.
*/
useTransaction: boolean = false
/**
* Extra parameters.
*
* @deprecated Use standard parameters instead
*/
nativeParameters: ObjectLiteral = {}
/**
* Query Comment to include extra information for debugging or other purposes.
*/
comment?: string
/**
* Items from an entity that have been locally generated & are recorded here for later use.
* Examples include the UUID generation when the database does not natively support it.
* These are included in the entity index order.
*/
locallyGenerated: { [key: number]: ObjectLiteral } = {}
commonTableExpressions: {
queryBuilder: QueryBuilder<any> | string
alias: string
options: QueryBuilderCteOptions
}[] = []
// -------------------------------------------------------------------------
// Constructor
// -------------------------------------------------------------------------
constructor(protected connection: DataSource) {
if (connection.options.relationLoadStrategy) {
this.relationLoadStrategy = connection.options.relationLoadStrategy
}
}
// -------------------------------------------------------------------------
// Accessors
// -------------------------------------------------------------------------
/**
* Get all ORDER BY queries - if order by is specified by user then it uses them,
* otherwise it uses default entity order by if it was set.
*/
get allOrderBys() {
if (
!Object.keys(this.orderBys).length &&
this.mainAlias!.hasMetadata &&
this.options.indexOf("disable-global-order") === -1
) {
const entityOrderBy = this.mainAlias!.metadata.orderBy || {}
return Object.keys(entityOrderBy).reduce((orderBy, key) => {
orderBy[this.mainAlias!.name + "." + key] = entityOrderBy[key]
return orderBy
}, {} as OrderByCondition)
}
return this.orderBys
}
// -------------------------------------------------------------------------
// Public Methods
// -------------------------------------------------------------------------
/**
* Creates a main alias and adds it to the current expression map.
*/
setMainAlias(alias: Alias): Alias {
// if main alias is already set then remove it from the array
// if (this.mainAlias)
// this.aliases.splice(this.aliases.indexOf(this.mainAlias));
// set new main alias
this.mainAlias = alias
return alias
}
/**
* Creates a new alias and adds it to the current expression map.
*/
createAlias(options: {
type: "from" | "select" | "join" | "other"
name?: string
target?: Function | string
tablePath?: string
subQuery?: string
metadata?: EntityMetadata
}): Alias {
let aliasName = options.name
if (!aliasName && options.tablePath) aliasName = options.tablePath
if (!aliasName && typeof options.target === "function")
aliasName = options.target.name
if (!aliasName && typeof options.target === "string")
aliasName = options.target
const alias = new Alias()
alias.type = options.type
if (aliasName) alias.name = aliasName
if (options.metadata) alias.metadata = options.metadata
if (options.target && !alias.hasMetadata)
alias.metadata = this.connection.getMetadata(options.target)
if (options.tablePath) alias.tablePath = options.tablePath
if (options.subQuery) alias.subQuery = options.subQuery
this.aliases.push(alias)
return alias
}
/**
* Finds alias with the given name.
* If alias was not found it throw an exception.
*/
findAliasByName(aliasName: string): Alias {
const alias = this.aliases.find((alias) => alias.name === aliasName)
if (!alias)
throw new TypeORMError(
`"${aliasName}" alias was not found. Maybe you forgot to join it?`,
)
return alias
}
findColumnByAliasExpression(
aliasExpression: string,
): ColumnMetadata | undefined {
const [aliasName, propertyPath] = aliasExpression.split(".")
const alias = this.findAliasByName(aliasName)
return alias.metadata.findColumnWithPropertyName(propertyPath)
}
/**
* Gets relation metadata of the relation this query builder works with.
*
* todo: add proper exceptions
*/
get relationMetadata(): RelationMetadata {
if (!this.mainAlias)
throw new TypeORMError(`Entity to work with is not specified!`) // todo: better message
const relationMetadata =
this.mainAlias.metadata.findRelationWithPropertyPath(
this.relationPropertyPath,
)
if (!relationMetadata)
throw new TypeORMError(
`Relation ${this.relationPropertyPath} was not found in entity ${this.mainAlias.name}`,
) // todo: better message
return relationMetadata
}
/**
* Copies all properties of the current QueryExpressionMap into a new one.
* Useful when QueryBuilder needs to create a copy of itself.
*/
clone(): QueryExpressionMap {
const map = new QueryExpressionMap(this.connection)
map.queryType = this.queryType
map.selects = this.selects.map((select) => select)
map.maxExecutionTime = this.maxExecutionTime
map.selectDistinct = this.selectDistinct
map.selectDistinctOn = this.selectDistinctOn
this.aliases.forEach((alias) => map.aliases.push(new Alias(alias)))
map.relationLoadStrategy = this.relationLoadStrategy
map.mainAlias = this.mainAlias
map.valuesSet = this.valuesSet
map.returning = this.returning
map.onConflict = this.onConflict
map.onIgnore = this.onIgnore
map.onUpdate = this.onUpdate
map.joinAttributes = this.joinAttributes.map(
(join) => new JoinAttribute(this.connection, this, join),
)
map.relationIdAttributes = this.relationIdAttributes.map(
(relationId) => new RelationIdAttribute(this, relationId),
)
map.relationCountAttributes = this.relationCountAttributes.map(
(relationCount) => new RelationCountAttribute(this, relationCount),
)
map.wheres = this.wheres.map((where) => ({ ...where }))
map.havings = this.havings.map((having) => ({ ...having }))
map.orderBys = Object.assign({}, this.orderBys)
map.groupBys = this.groupBys.map((groupBy) => groupBy)
map.limit = this.limit
map.offset = this.offset
map.skip = this.skip
map.take = this.take
map.lockMode = this.lockMode
map.lockVersion = this.lockVersion
map.lockTables = this.lockTables
map.withDeleted = this.withDeleted
map.parameters = Object.assign({}, this.parameters)
map.disableEscaping = this.disableEscaping
map.enableRelationIdValues = this.enableRelationIdValues
map.extraAppendedAndWhereCondition = this.extraAppendedAndWhereCondition
map.subQuery = this.subQuery
map.aliasNamePrefixingEnabled = this.aliasNamePrefixingEnabled
map.cache = this.cache
map.cacheId = this.cacheId
map.cacheDuration = this.cacheDuration
map.relationPropertyPath = this.relationPropertyPath
map.of = this.of
map.insertColumns = this.insertColumns
map.whereEntities = this.whereEntities
map.updateEntity = this.updateEntity
map.callListeners = this.callListeners
map.useTransaction = this.useTransaction
map.nativeParameters = Object.assign({}, this.nativeParameters)
map.comment = this.comment
map.commonTableExpressions = this.commonTableExpressions.map(
(cteOptions) => ({
alias: cteOptions.alias,
queryBuilder:
typeof cteOptions.queryBuilder === "string"
? cteOptions.queryBuilder
: cteOptions.queryBuilder.clone(),
options: cteOptions.options,
}),
)
return map
}
}