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* Services for the meta table.
* @packageDocumentation
*/
import { BaseService } from "./util";
/**
* Meta architecture.
*/
export interface Meta {
name: string;
value: string;
}
/**
* Meta with only name architecture.
*/
interface MetaName {
name: string;
}
/**
* Meta with only value architecture.
*/
interface MetaValue {
value: string;
}
/**
* Meta services.
*/
export class MetaService extends BaseService {
/**
* Check if a key name exists.
*
* @param name The key name.
* @returns Whether or not the name exists.
*/
public async exists(name: string): Promise<boolean> {
const sql = `SELECT name FROM Meta WHERE name = ?;`;
const params = [name];
const rows: MetaName[] = await this.dbm.execute(sql, params);
return rows.length > 0;
}
/**
* Get the value given the key name.
*
* @param name The key name.
* @returns The value.
*/
public async get(name: string): Promise<string> {
const sql = `SELECT value FROM Meta WHERE name = ?;`;
const params = [name];
const rows: MetaValue[] = await this.dbm.execute(sql, params);
return rows[0]?.value;
}
/**
* Set the key name and value.
*
* @param name The key name.
* @param value The value.
*/
public async set(name: string, value: string): Promise<void> {
const nameExists = await this.exists(name);
let sql: string;
let params: string[];
if (!nameExists) {
sql = `
INSERT INTO Meta (
name, value
) VALUES (
?, ?
);
`;
params = [name, value];
} else {
sql = `UPDATE Meta SET value = ? WHERE name = ?;`;
params = [value, name];
}
await this.dbm.execute(sql, params);
}
/**
* Delete the key name and value.
*
* @param name The key name.
*/
public async remove(name: string): Promise<void> {
const sql = `DELETE FROM Meta WHERE name = ?;`;
const params = [name];
await this.dbm.execute(sql, params);
}
/**
* Get all key names and values.
*
* @returns Key names and values.
*/
public async getAll(): Promise<Meta[]> {
const sql = `SELECT * FROM Meta;`;
const params = [];
const rows: Meta[] = await this.dbm.execute(sql, params);
return rows;
}
}
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