refactor: Enhance code (in SqliteDriver and JSONDriver), correct typing errors, ... (#530)

Author: Αξονας

src/drivers/JSONDriver.ts

@@ -33,6 +33,7 @@ export class JSONDriver extends MemoryDriver {
             const contents = readFileSync(this.path, { encoding: "utf-8" });
 
             try {
+                
                 const data = JSON.parse(contents);
                 for (const table in data) {
                     const store = this.getOrCreateTable(table);

src/drivers/PostgresDriver.ts

@@ -102,7 +102,7 @@ export class PostgresDriver implements IRemoteDriver {
             [key]
         );
 
-        if (queryResult.rowCount < 1) return [null, false];
+        if (Number(queryResult.rowCount) < 1) return [null, false];
         return [JSON.parse(queryResult.rows[0].value), true];
     }
 
@@ -135,7 +135,7 @@ export class PostgresDriver implements IRemoteDriver {
         this.checkConnection();
 
         const queryResult = await this.conn!.query(`DELETE FROM ${table}`);
-        return queryResult.rowCount;
+        return queryResult.rowCount as number;
     }
 
     public async deleteRowByKey(table: string, key: string): Promise<number> {
@@ -145,6 +145,6 @@ export class PostgresDriver implements IRemoteDriver {
             `DELETE FROM ${table} WHERE id = $1`,
             [key]
         );
-        return queryResult.rowCount;
+        return queryResult.rowCount as number;
     }
 }

src/drivers/SqliteDriver.ts

@@ -43,16 +43,12 @@ export class SqliteDriver implements IDriver {
         const prep = this._database.prepare<{ ID: string; json: string }[]>(
             `SELECT * FROM ${table}`
         );
-        const data = [];
-
-        for (const row of prep.iterate()) {
-            data.push({
-                id: (row as { ID: string; json: string }).ID,
-                value: JSON.parse((row as { ID: string; json: string }).json),
-            });
-        }
-
-        return data;
+        return (prep.all() as { ID: string, json: string }[])
+            .map(row  => ({
+                id: row.ID,
+                value: JSON.parse(row.json),
+            })
+        );
     }
 
     public async getRowByKey<T>(
@@ -73,17 +69,13 @@ export class SqliteDriver implements IDriver {
         const prep = this._database.prepare<{ ID: string; json: string }[]>(
             `SELECT * FROM ${table} WHERE ID LIKE '${query}%'`
         );
-
-        const data = [];
-
-        for (const row of prep.iterate()) {
-            data.push({
-                id: (row as { ID: string; json: string }).ID,
-                value: JSON.parse((row as { id: string; json: string }).json),
-            });
-        }
-
-        return data;
+        
+        return (prep.all() as { ID: string, json: string }[])
+            .map(row  => ({
+                id: row.ID,
+                value: JSON.parse(row.json),
+            })
+        );
     }
 
     public async setRowByKey<T>(