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DatabaseDriver.ts
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DatabaseDriver.ts
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import { EntityManagerType, FindOneOptions, FindOptions, IDatabaseDriver, PopulateOptions } from './IDatabaseDriver';
import { EntityData, EntityMetadata, EntityProperty, FilterQuery, AnyEntity, Dictionary, Primary } from '../typings';
import { MetadataStorage } from '../metadata';
import { Connection, QueryResult, Transaction } from '../connections';
import { Configuration, ConnectionOptions, Utils } from '../utils';
import { QueryOrder, QueryOrderMap } from '../enums';
import { Platform } from '../platforms';
import { Collection, wrap } from '../entity';
import { DriverException, EntityManager, LockMode } from '../index';
export abstract class DatabaseDriver<C extends Connection> implements IDatabaseDriver<C> {
[EntityManagerType]: EntityManager<this>;
protected readonly connection!: C;
protected readonly replicas: C[] = [];
protected readonly platform!: Platform;
protected readonly logger = this.config.getLogger();
protected metadata!: MetadataStorage;
protected constructor(protected readonly config: Configuration,
protected readonly dependencies: string[]) { }
abstract async find<T extends AnyEntity<T>>(entityName: string, where: FilterQuery<T>, options?: FindOptions<T>, ctx?: Transaction): Promise<T[]>;
abstract async findOne<T extends AnyEntity<T>>(entityName: string, where: FilterQuery<T>, options?: FindOneOptions<T>, ctx?: Transaction): Promise<T | null>;
abstract async nativeInsert<T extends AnyEntity<T>>(entityName: string, data: EntityData<T>, ctx?: Transaction): Promise<QueryResult>;
abstract async nativeUpdate<T extends AnyEntity<T>>(entityName: string, where: FilterQuery<T>, data: EntityData<T>, ctx?: Transaction): Promise<QueryResult>;
abstract async nativeDelete<T extends AnyEntity<T>>(entityName: string, where: FilterQuery<T>, ctx?: Transaction): Promise<QueryResult>;
abstract async count<T extends AnyEntity<T>>(entityName: string, where: FilterQuery<T>, ctx?: Transaction): Promise<number>;
createEntityManager<D extends IDatabaseDriver = IDatabaseDriver>(useContext?: boolean): D[typeof EntityManagerType] {
return new EntityManager(this.config, this, this.metadata, useContext) as unknown as EntityManager<D>;
}
async aggregate(entityName: string, pipeline: any[]): Promise<any[]> {
throw new Error(`Aggregations are not supported by ${this.constructor.name} driver`);
}
async loadFromPivotTable<T extends AnyEntity<T>, O extends AnyEntity<O>>(prop: EntityProperty, owners: Primary<O>[][], where?: FilterQuery<T>, orderBy?: QueryOrderMap, ctx?: Transaction): Promise<Dictionary<T[]>> {
throw new Error(`${this.constructor.name} does not use pivot tables`);
}
async syncCollection<T extends AnyEntity<T>, O extends AnyEntity<O>>(coll: Collection<T, O>, ctx?: Transaction): Promise<void> {
const pk = this.metadata.get(coll.property.type).primaryKeys[0];
const data = { [coll.property.name]: coll.getIdentifiers(pk) } as EntityData<T>;
await this.nativeUpdate<T>(coll.owner.constructor.name, wrap(coll.owner, true).__primaryKey, data, ctx);
}
mapResult<T extends AnyEntity<T>>(result: EntityData<T>, meta: EntityMetadata, populate: PopulateOptions[] = []): T | null {
if (!result || !meta) {
return null;
}
const ret = Object.assign({}, result) as any;
Object.values(meta.properties).forEach(prop => {
if (prop.fieldNames && prop.fieldNames.length > 1 && prop.fieldNames.every(joinColumn => joinColumn in ret)) {
const temp: any[] = [];
prop.fieldNames.forEach(joinColumn => {
temp.push(ret[joinColumn]);
delete ret[joinColumn];
});
ret[prop.name] = temp;
} else if (prop.fieldNames && prop.fieldNames[0] in ret) {
Utils.renameKey(ret, prop.fieldNames[0], prop.name);
}
if (prop.type === 'boolean' && ![null, undefined].includes(ret[prop.name])) {
ret[prop.name] = !!ret[prop.name];
}
});
return ret as T;
}
async connect(): Promise<C> {
await this.connection.connect();
await Promise.all(this.replicas.map(replica => replica.connect()));
return this.connection;
}
async reconnect(): Promise<C> {
await this.close(true);
return this.connect();
}
getConnection(type: 'read' | 'write' = 'write'): C {
if (type === 'write' || this.replicas.length === 0) {
return this.connection as C;
}
const rand = Utils.randomInt(0, this.replicas.length - 1);
return this.replicas[rand] as C;
}
async close(force?: boolean): Promise<void> {
await Promise.all(this.replicas.map(replica => replica.close(force)));
await this.connection.close(force);
}
getPlatform(): Platform {
return this.platform;
}
setMetadata(metadata: MetadataStorage): void {
this.metadata = metadata;
this.connection.setMetadata(metadata);
}
getDependencies(): string[] {
return this.dependencies;
}
async ensureIndexes(): Promise<void> {
throw new Error(`${this.constructor.name} does not use ensureIndexes`);
}
protected getPivotOrderBy(prop: EntityProperty, orderBy?: QueryOrderMap): QueryOrderMap {
if (orderBy) {
return orderBy;
}
if (prop.orderBy) {
return prop.orderBy;
}
if (prop.fixedOrder) {
return { [`${prop.pivotTable}.${prop.fixedOrderColumn}`]: QueryOrder.ASC };
}
return {};
}
protected getPrimaryKeyFields(entityName: string): string[] {
const meta = this.metadata.get(entityName, false, false);
return meta ? meta.primaryKeys : [this.config.getNamingStrategy().referenceColumnName()];
}
protected getPivotInverseProperty(prop: EntityProperty): EntityProperty {
const pivotMeta = this.metadata.get(prop.pivotTable);
let inverse: string;
if (prop.owner) {
const pivotProp1 = pivotMeta.properties[prop.type + '_inverse'];
inverse = pivotProp1.mappedBy;
} else {
const pivotProp1 = pivotMeta.properties[prop.type + '_owner'];
inverse = pivotProp1.inversedBy;
}
return pivotMeta.properties[inverse];
}
protected createReplicas(cb: (c: ConnectionOptions) => C): C[] {
const replicas = this.config.get('replicas', [])!;
const ret: C[] = [];
const props = ['dbName', 'clientUrl', 'host', 'port', 'user', 'password', 'multipleStatements', 'pool', 'name'] as const;
replicas.forEach((conf: Partial<ConnectionOptions>) => {
props.forEach(prop => (conf[prop] as any) = prop in conf ? conf[prop] : this.config.get(prop));
ret.push(cb(conf as ConnectionOptions));
});
return ret;
}
async lockPessimistic<T extends AnyEntity<T>>(entity: T, mode: LockMode, ctx?: Transaction): Promise<void> {
throw new Error(`Pessimistic locks are not supported by ${this.constructor.name} driver`);
}
/**
* @inheritDoc
*/
convertException(exception: Error): DriverException {
return this.platform.getExceptionConverter().convertException(exception);
}
protected rethrow<T>(promise: Promise<T>): Promise<T> {
return promise.catch(e => {
throw this.convertException(e);
});
}
}