@decaf-ts/core
Version:
Core persistence module for the decaf framework
224 lines • 21.7 kB
JavaScript
"use strict";
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
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};
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};
var _a, _b, _c, _d;
Object.defineProperty(exports, "__esModule", { value: true });
exports.Statement = void 0;
const decorator_validation_1 = require("@decaf-ts/decorator-validation");
const Condition_1 = require("./Condition.cjs");
const db_decorators_1 = require("@decaf-ts/db-decorators");
const decorators_1 = require("./../utils/decorators.cjs");
const errors_1 = require("./errors.cjs");
const logging_1 = require("@decaf-ts/logging");
/**
* @description Base class for database query statements
* @summary Provides a foundation for building and executing database queries
*
* This abstract class implements the query builder pattern for constructing
* database queries. It supports various query operations like select, from,
* where, orderBy, groupBy, limit, and offset. It also provides methods for
* executing queries and handling pagination.
*
* @template Q - The query type specific to the database adapter
* @template M - The model type this statement operates on
* @template R - The return type of the query
* @param {Adapter<any, Q, any, any>} adapter - The database adapter to use for executing queries
* @class Statement
* @example
* // Create a statement to query users
* const statement = new SQLStatement(adapter);
* const users = await statement
* .select()
* .from(User)
* .where(Condition.attribute("status").eq("active"))
* .orderBy(["createdAt", "DESC"])
* .limit(10)
* .execute();
*
* // Use pagination
* const paginator = await statement
* .select()
* .from(User)
* .paginate(20); // 20 users per page
*
* @mermaid
* sequenceDiagram
* participant Client
* participant Statement
* participant Adapter
* participant Database
*
* Client->>Statement: select()
* Client->>Statement: from(Model)
* Client->>Statement: where(condition)
* Client->>Statement: orderBy([field, direction])
* Client->>Statement: limit(value)
* Client->>Statement: execute()
* Statement->>Statement: build()
* Statement->>Adapter: raw(query)
* Adapter->>Database: execute query
* Database-->>Adapter: return results
* Adapter-->>Statement: return processed results
* Statement-->>Client: return final results
*/
class Statement extends logging_1.LoggedClass {
constructor(adapter) {
super();
this.adapter = adapter;
}
get log() {
return this.adapter.log.for(Statement);
}
select(selector) {
Object.defineProperty(this, "selectSelector", {
value: selector,
writable: false,
});
return this;
}
distinct(selector) {
this.distinctSelector = selector;
return this;
}
max(selector) {
this.maxSelector = selector;
return this;
}
min(selector) {
this.minSelector = selector;
return this;
}
count(selector) {
this.countSelector = selector;
return this;
}
from(selector) {
this.fromSelector = (typeof selector === "string" ? decorator_validation_1.Model.get(selector) : selector);
if (!this.fromSelector)
throw new errors_1.QueryError(`Could not find selector model: ${selector}`);
return this;
}
where(condition) {
this.whereCondition = condition;
return this;
}
orderBy(selector) {
this.orderBySelector = selector;
return this;
}
groupBy(selector) {
this.groupBySelector = selector;
return this;
}
limit(value) {
this.limitSelector = value;
return this;
}
offset(value) {
this.offsetSelector = value;
return this;
}
async execute() {
try {
const query = this.build();
return (await this.raw(query));
}
catch (e) {
throw new db_decorators_1.InternalError(e);
}
}
async raw(rawInput) {
const results = await this.adapter.raw(rawInput);
if (!this.selectSelector)
return results;
const pkAttr = (0, db_decorators_1.findPrimaryKey)(new this.fromSelector()).id;
const processor = function recordProcessor(r) {
const id = r[pkAttr];
return this.adapter.revert(r, this.fromSelector, pkAttr, id);
}.bind(this);
if (Array.isArray(results))
return results.map(processor);
return processor(results);
}
}
exports.Statement = Statement;
__decorate([
(0, decorators_1.final)(),
__metadata("design:type", Function),
__metadata("design:paramtypes", [Array]),
__metadata("design:returntype", Object)
], Statement.prototype, "select", null);
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__decorate([
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__decorate([
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__decorate([
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__decorate([
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__metadata("design:type", Function),
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__decorate([
(0, decorators_1.final)(),
__metadata("design:type", Function),
__metadata("design:paramtypes", [Array]),
__metadata("design:returntype", Object)
], Statement.prototype, "orderBy", null);
__decorate([
(0, decorators_1.final)(),
__metadata("design:type", Function),
__metadata("design:paramtypes", [Object]),
__metadata("design:returntype", Object)
], Statement.prototype, "groupBy", null);
__decorate([
(0, decorators_1.final)(),
__metadata("design:type", Function),
__metadata("design:paramtypes", [Number]),
__metadata("design:returntype", Object)
], Statement.prototype, "limit", null);
__decorate([
(0, decorators_1.final)(),
__metadata("design:type", Function),
__metadata("design:paramtypes", [Number]),
__metadata("design:returntype", Object)
], Statement.prototype, "offset", null);
__decorate([
(0, decorators_1.final)(),
__metadata("design:type", Function),
__metadata("design:paramtypes", []),
__metadata("design:returntype", Promise)
], Statement.prototype, "execute", null);
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It supports various query operations like select, from,\n * where, orderBy, groupBy, limit, and offset. It also provides methods for\n * executing queries and handling pagination.\n *\n * @template Q - The query type specific to the database adapter\n * @template M - The model type this statement operates on\n * @template R - The return type of the query\n * @param {Adapter<any, Q, any, any>} adapter - The database adapter to use for executing queries\n * @class Statement\n * @example\n * // Create a statement to query users\n * const statement = new SQLStatement(adapter);\n * const users = await statement\n *   .select()\n *   .from(User)\n *   .where(Condition.attribute(\"status\").eq(\"active\"))\n *   .orderBy([\"createdAt\", \"DESC\"])\n *   .limit(10)\n *   .execute();\n *\n * // Use pagination\n * const paginator = await statement\n *   .select()\n *   .from(User)\n *   .paginate(20); // 20 users per page\n *\n * @mermaid\n * sequenceDiagram\n *   participant Client\n *   participant Statement\n *   participant Adapter\n *   participant Database\n *\n *   Client->>Statement: select()\n *   Client->>Statement: from(Model)\n *   Client->>Statement: where(condition)\n *   Client->>Statement: orderBy([field, direction])\n *   Client->>Statement: limit(value)\n *   Client->>Statement: execute()\n *   Statement->>Statement: build()\n *   Statement->>Adapter: raw(query)\n *   Adapter->>Database: execute query\n *   Database-->>Adapter: return results\n *   Adapter-->>Statement: return processed results\n *   Statement-->>Client: return final results\n */\nexport abstract class Statement<Q, M extends Model, R>\n  extends LoggedClass\n  implements Executor<R>, RawExecutor<Q>, Paginatable<M, R, Q>\n{\n  protected readonly selectSelector?: SelectSelector<M>[];\n  protected distinctSelector?: SelectSelector<M>;\n  protected maxSelector?: SelectSelector<M>;\n  protected minSelector?: SelectSelector<M>;\n  protected countSelector?: SelectSelector<M>;\n  protected fromSelector!: Constructor<M>;\n  protected whereCondition?: Condition<M>;\n  protected orderBySelector?: OrderBySelector<M>;\n  protected groupBySelector?: GroupBySelector<M>;\n  protected limitSelector?: number;\n  protected offsetSelector?: number;\n\n  protected constructor(protected adapter: Adapter<any, any, Q, any, any>) {\n    super();\n  }\n\n  protected override get log(): Logger {\n    return (this.adapter as any).log.for(Statement);\n  }\n\n  select<\n    // eslint-disable-next-line @typescript-eslint/no-unused-vars\n    S extends readonly SelectSelector<M>[],\n  >(): SelectOption<M, M[]>;\n  select<S extends readonly SelectSelector<M>[]>(\n    selector: readonly [...S]\n  ): SelectOption<M, Pick<M, S[number]>[]>;\n\n  @final()\n  select<S extends readonly SelectSelector<M>[]>(\n    selector?: readonly [...S]\n  ): SelectOption<M, M[]> | SelectOption<M, Pick<M, S[number]>[]> {\n    Object.defineProperty(this, \"selectSelector\", {\n      value: selector,\n      writable: false,\n    });\n    return this as SelectOption<M, M[]> | SelectOption<M, Pick<M, S[number]>[]>;\n  }\n\n  @final()\n  distinct<S extends SelectSelector<M>>(\n    selector: S\n  ): DistinctOption<M, M[S][]> {\n    this.distinctSelector = selector;\n    return this as DistinctOption<M, M[S][]>;\n  }\n\n  @final()\n  max<S extends SelectSelector<M>>(selector: S): MaxOption<M, M[S]> {\n    this.maxSelector = selector;\n    return this as MaxOption<M, M[S]>;\n  }\n\n  @final()\n  min<S extends SelectSelector<M>>(selector: S): MinOption<M, M[S]> {\n    this.minSelector = selector;\n    return this as MinOption<M, M[S]>;\n  }\n\n  @final()\n  count<S extends SelectSelector<M>>(selector?: S): CountOption<M, number> {\n    this.countSelector = selector;\n    return this as CountOption<M, number>;\n  }\n\n  @final()\n  public from(selector: FromSelector<M>): WhereOption<M, R> {\n    this.fromSelector = (\n      typeof selector === \"string\" ? Model.get(selector) : selector\n    ) as Constructor<M>;\n    if (!this.fromSelector)\n      throw new QueryError(`Could not find selector model: ${selector}`);\n    return this;\n  }\n\n  @final()\n  public where(condition: Condition<M>): OrderAndGroupOption<M, R> {\n    this.whereCondition = condition;\n    return this;\n  }\n\n  @final()\n  public orderBy(\n    selector: OrderBySelector<M>\n  ): LimitOption<M, R> & OffsetOption<R> {\n    this.orderBySelector = selector;\n    return this;\n  }\n\n  @final()\n  public groupBy(selector: GroupBySelector<M>): LimitOption<M, R> {\n    this.groupBySelector = selector;\n    return this;\n  }\n\n  @final()\n  public limit(value: number): OffsetOption<R> {\n    this.limitSelector = value;\n    return this;\n  }\n\n  @final()\n  public offset(value: number): Executor<R> {\n    this.offsetSelector = value;\n    return this;\n  }\n\n  @final()\n  async execute(): Promise<R> {\n    try {\n      const query: Q = this.build();\n      return (await this.raw(query)) as R;\n    } catch (e: unknown) {\n      throw new InternalError(e as Error);\n    }\n  }\n\n  async raw<R>(rawInput: Q): Promise<R> {\n    const results = await this.adapter.raw<R>(rawInput);\n    if (!this.selectSelector) return results;\n    const pkAttr = findPrimaryKey(\n      new (this.fromSelector as Constructor<M>)()\n    ).id;\n\n    const processor = function recordProcessor(\n      this: Statement<Q, M, R>,\n      r: any\n    ) {\n      const id = r[pkAttr];\n      return this.adapter.revert(\n        r,\n        this.fromSelector as Constructor<any>,\n        pkAttr,\n        id\n      ) as any;\n    }.bind(this as any);\n\n    if (Array.isArray(results)) return results.map(processor) as R;\n    return processor(results) as R;\n  }\n\n  protected abstract build(): Q;\n  protected abstract parseCondition(condition: Condition<M>, ...args: any[]): Q;\n  abstract paginate(size: number): Promise<Paginator<M, R, Q>>;\n}\n"]}