[feat] add query example

clib/main.go

@@ -5,7 +5,6 @@ package main
 import "C"
 
 import (
-	"fmt"
 	"strings"
 	"unsafe"
 
@@ -30,7 +29,6 @@ func InitSQLite(params *C.char) {
 func CreateRowIterator(data *C.char, size C.int) C.int {
 	var it = &facade.RowsIter{}
 	input := C.GoBytes(unsafe.Pointer(data), size)
-	fmt.Println("input", input)
 	it.Exec(input)
 	ptr := C.int(len(iterators))
 	iterators[len(iterators)] = it

client/Builder.ts

@@ -97,11 +97,11 @@ export default class Builder<I extends abstract new (...args: any) => any> {
     this.methodCalls.set("Find", [filter]);
     return this;
   }
-  Select(fields: string[]): Builder<I> {
-    this.methodCalls.set("Select", fields);
+  Select(fields: Record<string, any>): Builder<I> {
+    this.methodCalls.set("Select", [fields]);
     return this;
   }
-  Fields(fields: string[]): Builder<I> {
+  Fields(fields: Record<string, any>): Builder<I> {
     this.Select(fields);
     return this;
   }
@@ -207,6 +207,6 @@ export default class Builder<I extends abstract new (...args: any) => any> {
       throw new Error(await response.text());
     }
     const buf = await response.arrayBuffer();
-    return decodeResponse(new Uint8Array(buf));
+    return decodeResponse(new Uint8Array(buf))!;
   }
 }

client/Bunding.ts

@@ -5,7 +5,7 @@ import { dlopen, FFIType, suffix, ptr, toBuffer } from "bun:ffi";
 import { join } from "path";
 
 const libname = `clib.${suffix}`;
-const libpath = join("clib", libname);
+const libpath = join(import.meta.dir, "..", "clib", libname);
 
 const {
   symbols: { InitSQLite, CreateRowIterator, NextRow, GetLen, Free, Cleanup },

client/Protocol.ts

@@ -31,7 +31,8 @@ export function encodeRequest(request: Request): Uint8Array {
   return encode(request);
 }
 
-export function decodeResponse(input: Uint8Array): ExecResult {
+export function decodeResponse(input: Uint8Array): ExecResult | null {
+  try {
     const res = decode(input) as {
       i: number;
       ra: number;
@@ -44,11 +45,15 @@ export function decodeResponse(input: Uint8Array): ExecResult {
       LastInsertId: res.li,
       Msg: res.m,
     };
+  } catch (e) {
+    return null;
+  }
 }
 
 const ROW_TAG = [0x81, 0xa1, 0x72];
 
-export function decodeRows(input: Uint8Array): Row[] {
+export function decodeRows(input: Uint8Array): Row[] | null {
+  try {
     const rows = [];
     let count = 0;
     let buf = [];
@@ -72,6 +77,9 @@ export function decodeRows(input: Uint8Array): Row[] {
     rows.push([...ROW_TAG, ...buf]);
     rows.shift();
     return rows.map((row) => decode(new Uint8Array(row as number[]))) as Row[];
+  } catch (e) {
+    return null;
+  }
 }
 
 export async function* decodeRowsIterator(
@@ -84,7 +92,7 @@ export async function* decodeRowsIterator(
       break;
     }
     const rows = decodeRows(value);
-    for (const row of rows) {
+    for (const row of rows!) {
       yield row;
     }
   }

client/libdal.ts

@@ -1,8 +1,13 @@
 import Builder from "./Builder";
-import Binding from "./Library";
+import Bunding from "./Library";
 import { encodeRequest, decodeRows, decodeResponse } from "./Protocol";
 import type { ExecResult } from "./Protocol";
 
+//@ts-ignore
+const Binding = Bunding.default ?? Bunding;
+
+Binding.initSQLite(Buffer.from(" "));
+
 type Options = {
   database: string;
 };
@@ -24,11 +29,15 @@ export default class CBuilder<
     const req = Buffer.from(encodeRequest(this.request));
     const iter = Binding.rowIterator(req);
     for (;;) {
-      const response = iter.next();
+      const response = iter.next() as Buffer;
+      const error = decodeResponse(response);
+      if (error?.Msg) {
+        throw new Error(error.Msg);
+      }
       const rows = decodeRows(response);
-      if (rows.length === 0) {
+      if (!rows || rows.length === 0) {
         iter.cleanup();
-        break;
+        return;
       }
       for (const row of rows) {
         if (this.headerRow === null) {
@@ -52,6 +61,6 @@ export default class CBuilder<
     const req = Buffer.from(encodeRequest(this.request));
     const iter = Binding.rowIterator(req);
     const response = iter.next();
-    return decodeResponse(response);
+    return decodeResponse(response)!;
   }
 }

examples/bun/README.md

@@ -1,4 +1,4 @@
-# bun-dal-exmaple
+# bun-dal-example
 
 To install dependencies:
 

examples/bun/find.test.ts

@@ -0,0 +1,50 @@
+import { describe, expect, test } from "bun:test";
+import path from "path";
+import DAL from "@nesterow/dal/client/libdal";
+
+// in this case we need to use absolute path
+const DATABASE_PATH = path.join(import.meta.dir, "..", "data", "chinook.db");
+
+const db = new DAL({
+  database: DATABASE_PATH,
+});
+
+describe("Query Interface", () => {
+  test(".Find", async () => {
+    const items = db
+      .In("artists")
+      .Find({
+        name: { $glob: "A*" },
+      })
+      .Limit(10)
+      .Rows();
+
+    for await (const item of items) {
+      console.log(item);
+    }
+
+    expect(true).toBe(true);
+  });
+
+  test(".Find.As", async () => {
+    class Artist {
+      ArtistId = 0;
+      Name = "";
+    }
+
+    const items = db
+      .In("artists")
+      .Find({
+        name: { $glob: "B*" },
+      })
+      .As(Artist)
+      .Limit(1)
+      .Rows();
+
+    for await (const item of items) {
+      console.log(item);
+    }
+    console.log("done");
+    expect(true).toBe(true);
+  });
+});

examples/bun/index.ts

@@ -1 +0,0 @@
-console.log("Hello via Bun!");

examples/bun/join.test.ts

@@ -0,0 +1,55 @@
+import { describe, expect, test } from "bun:test";
+import path from "path";
+import DAL from "@nesterow/dal/client/libdal";
+
+// in this case we need to use absolute path
+const DATABASE_PATH = path.join(import.meta.dir, "..", "data", "chinook.db");
+
+const db = new DAL({
+  database: DATABASE_PATH,
+});
+
+describe("Query Interface", () => {
+  test(".Join [album < artist < tracks (find tracks for all artists whose names start with 'A')]", async () => {
+    class Album {
+      TrackId = 0;
+      TrackName = "";
+      ArtistName = "";
+      AlbumTitle = "";
+    }
+    const items = db
+      .In("albums al")
+      .Join(
+        {
+          $for: "artists ar",
+          $do: {
+            "al.ArtistId": "ar.ArtistId",
+          },
+        },
+        {
+          $for: "tracks tr",
+          $do: {
+            "al.AlbumId": "tr.AlbumId",
+          },
+        },
+      )
+      .Find({
+        "ar.Name": { $glob: "A*" },
+      })
+      .Fields({
+        "tr.TrackId" : "TrackId",
+        "tr.Name" : "TrackName",
+        "ar.Name" : "ArtistName",
+        "al.Title" : "AlbumTitle",
+      })
+      .Limit(10)
+      .As(Album)
+      .Rows();
+
+    for await (const item of items) {
+      console.log(item);
+    }
+
+    expect(true).toBe(true);
+  });
+});

examples/data/.gitignore

@@ -0,0 +1,5 @@
+chinook.db-shm
+chinook.db-wal
+inserts.db
+inserts.db-shm
+inserts.db-wal

pkg/adapter/DBAdapter.go

@@ -114,6 +114,7 @@ func (a *DBAdapter) CleanUp() {
 }
 
 func (a *DBAdapter) Query(req Query) (*sql.Rows, error) {
+	fmt.Println(req)
 	db, err := a.Open(req.Db)
 	if err != nil {
 		return nil, err
@@ -132,6 +133,7 @@ func (a *DBAdapter) Query(req Query) (*sql.Rows, error) {
 	if err != nil {
 		return nil, err
 	}
+
 	return sfmt.Query(req.Data...)
 }
 

pkg/builder/Builder.go

@@ -116,12 +116,12 @@ func (b *Builder) Sort(sort Map) *Builder {
 	return b
 }
 
-func (b *Builder) Limit(limit int) *Builder {
+func (b *Builder) Limit(limit int64) *Builder {
 	b.Parts.LimitExp = fmt.Sprintf("LIMIT %d", limit)
 	return b
 }
 
-func (b *Builder) Offset(offset int) *Builder {
+func (b *Builder) Offset(offset int64) *Builder {
 	b.Parts.OffsetExp = fmt.Sprintf("OFFSET %d", offset)
 	return b
 }