@decaf-ts/for-postgres
Version:
template for ts projects
182 lines • 18.3 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.PostgresPaginator = void 0;
const core_1 = require("@decaf-ts/core");
/**
* @description Paginator for PostgreSQL query results
* @summary Implements pagination for PostgreSQL queries using LIMIT and OFFSET for efficient navigation through result sets
* @template M - The model type that extends Model
* @template R - The result type
* @param {PostgresAdapter<any, any, any>} adapter - The PostgreSQL adapter
* @param {PostgresQuery} query - The PostgresSQL query to paginate
* @param {number} size - The page size
* @param {Constructor<M>} clazz - The model constructor
* @class PostgresPaginator
* @example
* // Example of using PostgreSQLPaginator
* const adapter = new MyPostgreSQLAdapter(pool);
* const query = { table: "users" };
* const paginator = new PostgreSQLPaginator(adapter, query, 10, User);
*
* // Get the first page
* const page1 = await paginator.page(1);
*
* // Get the next page
* const page2 = await paginator.page(2);
*/
class PostgresPaginator extends core_1.Paginator {
/**
* @description Gets the total number of pages
* @summary Returns the total number of pages based on the record count and page size
* @return {number} The total number of pages
*/
get total() {
return this._totalPages;
}
/**
* @description Gets the total record count
* @summary Returns the total number of records matching the query
* @return {number} The total record count
*/
get count() {
return this._recordCount;
}
/**
* @description Creates a new PostgreSQLPaginator instance
* @summary Initializes a paginator for PostgreSQL query results
* @param {PostgresAdapter} adapter - The PostgreSQL adapter
* @param {PostgreSQLQuery} query - The PostgreSQL query to paginate
* @param {number} size - The page size
* @param {Constructor<M>} clazz - The model constructor
*/
constructor(adapter, query, size, clazz) {
super(adapter, query, size, clazz);
}
/**
* @description Prepares a query for pagination
* @summary Modifies the raw query to include pagination parameters
* @param {PostgresQuery} rawStatement - The original PostgreSQL query
* @return {PostgresQuery} The prepared query with pagination parameters
*/
prepare(rawStatement) {
const query = { ...rawStatement };
return query;
}
/**
* @description Retrieves a specific page of results
* @summary Executes the query with pagination and processes the results
* @param {number} [page=1] - The page number to retrieve
* @return {Promise<R[]>} A promise that resolves to an array of results
* @throws {PagingError} If trying to access an invalid page or if no class is defined
* @mermaid
* sequenceDiagram
* participant Client
* participant PostgreSQLPaginator
* participant Adapter
* participant PostgreSQL
*
* Client->>PostgreSQLPaginator: page(pageNumber)
* Note over PostgreSQLPaginator: Clone statement
*
* alt First time or need count
* PostgreSQLPaginator->>Adapter: Get total count
* Adapter->>PostgreSQL: Execute COUNT query
* PostgreSQL-->>Adapter: Return count
* Adapter-->>PostgreSQLPaginator: Return count
* PostgreSQLPaginator->>PostgreSQLPaginator: Calculate total pages
* end
*
* PostgreSQLPaginator->>PostgreSQLPaginator: validatePage(page)
* PostgreSQLPaginator->>PostgreSQLPaginator: Calculate offset
* PostgreSQLPaginator->>PostgreSQLPaginator: Add limit and offset to query
*
* PostgreSQLPaginator->>Adapter: raw(statement, false)
* Adapter->>PostgreSQL: Execute query
* PostgreSQL-->>Adapter: Return results
* Adapter-->>PostgreSQLPaginator: Return PostgreSQLResponse
*
* Note over PostgreSQLPaginator: Process results
*
* PostgreSQLPaginator->>PostgreSQLPaginator: Check for clazz
*
* alt No clazz
* PostgreSQLPaginator-->>Client: Throw PagingError
* else Has clazz
* PostgreSQLPaginator->>PostgreSQLPaginator: Find primary key
*
* alt Has columns in statement
* PostgreSQLPaginator->>PostgreSQLPaginator: Use rows directly
* else No columns
* PostgreSQLPaginator->>PostgreSQLPaginator: Process each row
* loop For each row
* PostgreSQLPaginator->>Adapter: revert(row, clazz, pkDef.id, id)
* end
* end
*
* PostgreSQLPaginator->>PostgreSQLPaginator: Update currentPage
* PostgreSQLPaginator-->>Client: Return results
* end
*/
async page(page = 1) {
throw new Error(`Not implemented yet`);
// const statement = { ...this.statement };
//
// // Get total count if not already calculated
// if (!this._recordCount || !this._totalPages) {
// this._totalPages = this._recordCount = 0;
//
// // Create a count query based on the original query
// const countQuery: PostgresQuery = {
// ...statement,
// count: true,
// limit: undefined,
// offset: undefined,
// };
//
// const countResult: QueryResult = await this.adapter.raw(
// countQuery,
// false
// );
// this._recordCount = parseInt(countResult.rows[0]?.count || "0", 10);
//
// if (this._recordCount > 0) {
// const size = statement?.limit || this.size;
// this._totalPages = Math.ceil(this._recordCount / size);
// }
// }
//
// this.validatePage(page);
//
// // Calculate offset based on page number
// const offset = (page - 1) * this.size;
// statement.limit = this.size;
// statement.offset = offset;
//
// const result: PostgreSQLResponse<any> = await this.adapter.raw(
// statement,
// false
// );
//
// if (!this.clazz) throw new PagingError("No statement target defined");
//
// const pkDef = findPrimaryKey(new this.clazz());
// const rows = result.rows || [];
//
// const results =
// statement.columns && statement.columns.length
// ? rows // has columns means it's not full model
// : rows.map((row: any) => {
// return this.adapter.revert(
// row,
// this.clazz,
// pkDef.id,
// Sequence.parseValue(pkDef.props.type, row[PostgreSQLKeys.ID])
// );
// });
//
// this._currentPage = page;
// return results as R[];
}
}
exports.PostgresPaginator = PostgresPaginator;
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The model type that extends Model\n * @template R - The result type\n * @param {PostgresAdapter<any, any, any>} adapter - The PostgreSQL adapter\n * @param {PostgresQuery} query - The PostgresSQL query to paginate\n * @param {number} size - The page size\n * @param {Constructor<M>} clazz - The model constructor\n * @class PostgresPaginator\n * @example\n * // Example of using PostgreSQLPaginator\n * const adapter = new MyPostgreSQLAdapter(pool);\n * const query = { table: \"users\" };\n * const paginator = new PostgreSQLPaginator(adapter, query, 10, User);\n *\n * // Get the first page\n * const page1 = await paginator.page(1);\n *\n * // Get the next page\n * const page2 = await paginator.page(2);\n */\nexport class PostgresPaginator<M extends Model, R> extends Paginator<\n  M,\n  R,\n  PostgresQuery\n> {\n  /**\n   * @description Gets the total number of pages\n   * @summary Returns the total number of pages based on the record count and page size\n   * @return {number} The total number of pages\n   */\n  override get total(): number {\n    return this._totalPages;\n  }\n\n  /**\n   * @description Gets the total record count\n   * @summary Returns the total number of records matching the query\n   * @return {number} The total record count\n   */\n  override get count(): number {\n    return this._recordCount;\n  }\n\n  /**\n   * @description Creates a new PostgreSQLPaginator instance\n   * @summary Initializes a paginator for PostgreSQL query results\n   * @param {PostgresAdapter} adapter - The PostgreSQL adapter\n   * @param {PostgreSQLQuery} query - The PostgreSQL query to paginate\n   * @param {number} size - The page size\n   * @param {Constructor<M>} clazz - The model constructor\n   */\n  constructor(\n    adapter: PostgresAdapter,\n    query: PostgresQuery,\n    size: number,\n    clazz: Constructor<M>\n  ) {\n    super(adapter, query, size, clazz);\n  }\n\n  /**\n   * @description Prepares a query for pagination\n   * @summary Modifies the raw query to include pagination parameters\n   * @param {PostgresQuery} rawStatement - The original PostgreSQL query\n   * @return {PostgresQuery} The prepared query with pagination parameters\n   */\n  protected prepare(rawStatement: PostgresQuery): PostgresQuery {\n    const query: PostgresQuery = { ...rawStatement };\n    return query;\n  }\n\n  /**\n   * @description Retrieves a specific page of results\n   * @summary Executes the query with pagination and processes the results\n   * @param {number} [page=1] - The page number to retrieve\n   * @return {Promise<R[]>} A promise that resolves to an array of results\n   * @throws {PagingError} If trying to access an invalid page or if no class is defined\n   * @mermaid\n   * sequenceDiagram\n   *   participant Client\n   *   participant PostgreSQLPaginator\n   *   participant Adapter\n   *   participant PostgreSQL\n   *\n   *   Client->>PostgreSQLPaginator: page(pageNumber)\n   *   Note over PostgreSQLPaginator: Clone statement\n   *\n   *   alt First time or need count\n   *     PostgreSQLPaginator->>Adapter: Get total count\n   *     Adapter->>PostgreSQL: Execute COUNT query\n   *     PostgreSQL-->>Adapter: Return count\n   *     Adapter-->>PostgreSQLPaginator: Return count\n   *     PostgreSQLPaginator->>PostgreSQLPaginator: Calculate total pages\n   *   end\n   *\n   *   PostgreSQLPaginator->>PostgreSQLPaginator: validatePage(page)\n   *   PostgreSQLPaginator->>PostgreSQLPaginator: Calculate offset\n   *   PostgreSQLPaginator->>PostgreSQLPaginator: Add limit and offset to query\n   *\n   *   PostgreSQLPaginator->>Adapter: raw(statement, false)\n   *   Adapter->>PostgreSQL: Execute query\n   *   PostgreSQL-->>Adapter: Return results\n   *   Adapter-->>PostgreSQLPaginator: Return PostgreSQLResponse\n   *\n   *   Note over PostgreSQLPaginator: Process results\n   *\n   *   PostgreSQLPaginator->>PostgreSQLPaginator: Check for clazz\n   *\n   *   alt No clazz\n   *     PostgreSQLPaginator-->>Client: Throw PagingError\n   *   else Has clazz\n   *     PostgreSQLPaginator->>PostgreSQLPaginator: Find primary key\n   *\n   *     alt Has columns in statement\n   *       PostgreSQLPaginator->>PostgreSQLPaginator: Use rows directly\n   *     else No columns\n   *       PostgreSQLPaginator->>PostgreSQLPaginator: Process each row\n   *       loop For each row\n   *         PostgreSQLPaginator->>Adapter: revert(row, clazz, pkDef.id, id)\n   *       end\n   *     end\n   *\n   *     PostgreSQLPaginator->>PostgreSQLPaginator: Update currentPage\n   *     PostgreSQLPaginator-->>Client: Return results\n   *   end\n   */\n  async page(page: number = 1): Promise<R[]> {\n    throw new Error(`Not implemented yet`);\n    // const statement = { ...this.statement };\n    //\n    // // Get total count if not already calculated\n    // if (!this._recordCount || !this._totalPages) {\n    //   this._totalPages = this._recordCount = 0;\n    //\n    //   // Create a count query based on the original query\n    //   const countQuery: PostgresQuery = {\n    //     ...statement,\n    //     count: true,\n    //     limit: undefined,\n    //     offset: undefined,\n    //   };\n    //\n    //   const countResult: QueryResult = await this.adapter.raw(\n    //     countQuery,\n    //     false\n    //   );\n    //   this._recordCount = parseInt(countResult.rows[0]?.count || \"0\", 10);\n    //\n    //   if (this._recordCount > 0) {\n    //     const size = statement?.limit || this.size;\n    //     this._totalPages = Math.ceil(this._recordCount / size);\n    //   }\n    // }\n    //\n    // this.validatePage(page);\n    //\n    // // Calculate offset based on page number\n    // const offset = (page - 1) * this.size;\n    // statement.limit = this.size;\n    // statement.offset = offset;\n    //\n    // const result: PostgreSQLResponse<any> = await this.adapter.raw(\n    //   statement,\n    //   false\n    // );\n    //\n    // if (!this.clazz) throw new PagingError(\"No statement target defined\");\n    //\n    // const pkDef = findPrimaryKey(new this.clazz());\n    // const rows = result.rows || [];\n    //\n    // const results =\n    //   statement.columns && statement.columns.length\n    //     ? rows // has columns means it's not full model\n    //     : rows.map((row: any) => {\n    //         return this.adapter.revert(\n    //           row,\n    //           this.clazz,\n    //           pkDef.id,\n    //           Sequence.parseValue(pkDef.props.type, row[PostgreSQLKeys.ID])\n    //         );\n    //       });\n    //\n    // this._currentPage = page;\n    // return results as R[];\n  }\n}\n"]}