nestjs rewrite

server/src/ems/ems.service.ts

@@ -0,0 +1,40 @@
+import { Injectable } from '@nestjs/common';
+import { InjectDataSource } from '@nestjs/typeorm';
+import { DataSource } from 'typeorm';
+
+@Injectable()
+export class EmsService {
+    constructor(
+        @InjectDataSource('emsConnection')
+        private dataSource: DataSource
+    ) { }
+
+    async getTypeRoles(): Promise<any[]> {
+        const result = await this.dataSource.query(`
+            SELECT * FROM "TypeRoles";
+            `)
+        return result
+    }
+
+    async getImages(city_id?: number, offset?: number, limit?: number): Promise<any[]> {
+        const result = await this.dataSource.query(`
+            SELECT * FROM "images"
+            ${city_id ? `WHERE city_id = ${city_id}` : ''}
+            ORDER BY city_id
+            OFFSET ${offset || 0} ROWS
+            FETCH NEXT ${limit || 10} ROWS ONLY;
+            `)
+        return result
+    }
+
+    async getFigures(year: number, city_id: number, offset?: number, limit?: number): Promise<any[]> {
+        const result = await this.dataSource.query(`
+            SELECT * FROM figures f
+            JOIN vObjects o ON f.object_id = o.object_id WHERE o.id_city = ${city_id} AND f.year = ${year}
+            ORDER BY f.year
+            OFFSET ${Number(offset) || 0} ROWS
+            FETCH NEXT ${Number(limit) || 10} ROWS ONLY;
+            `)
+        return result
+    }
+}