Merge pull request 'Added Joins' (#2) from dev into main

Reviewed-on: #2

readme.md

@@ -4,14 +4,14 @@
 
 TypeScript Libary for relational Database Requests. Requests are written in js/ts and it supports automatic Schema evulution.
 
-Fetures
+Features:
 - [x] select Query
 - [x] insert Query
 - [x] update Query
 - [x] remove Query
 - [x] create Schema
 - [x] remove unused Schema
-- [ ] joins
+- [x] joins
 - [ ] change Schema
 - [ ] Key-Value Store Shortcut
 - [ ] Views
@@ -101,9 +101,29 @@ let res = await select([Table2.AttrName2], Table1)
     .having(le(Table2.AttrName3, 5)) //optional
     .limit(10) //optional
     .query(db);
-
 ```
 
+Joins:
+```javascript
+import { INT, onAction } from "dblang"
+
+const TableA = db.newTable("TableA");
+const TableB = db.newTable("TableB");
+TableA.addAttribute("A1", INT, {
+    primaryKey: true
+});
+TableB.addAttribute("B1", INT, {
+    primaryKey: true,
+    foreignKey:{
+        link: TableA.A1,
+        onDelete: onAction.cascade
+    }
+});
+let res = await select([TableA.A1, TableB.B1], innerJoinOn(eq(TableA.A1, Tableb.B1)))
+    .query(db);
+```
+See: [Joins](#joins)
+
 #### Insert:
 ```javascript
 import { select } from "dblang"
@@ -121,6 +141,8 @@ await insert(Table2.AttrName2, Table2.AttrName3)
 
 #### Update:
 ```javascript
+import { update } from "dblang"
+
 await update(Table2)
     .set(Table2.AttrName2, plus(Table2.AttrName2,1))
     .set(Table2.AttrName3, minus(Table2.AttrName2,1))
@@ -130,6 +152,8 @@ await update(Table2)
 
 #### Remove:
 ```javascript
+import { remove } from "dblang"
+
 await remove(Table2)
     .where(geq(Table2.AttrName2, 5))
     .query(db);
@@ -205,7 +229,25 @@ StringModifier:
 
 (v\* = string, number, boolean, null, Modifier, Aggregation, select Query, Attribute)
 
-# Aggregations
+#### Joins
+
+- `crossJoin(t1, t2, ...)`
+- `naturalJoin(t1, t2, ...)`
+- `leftNaturalJoin(t1, t2, ...)`
+- `rightNaturalJoin(t1, t2, ...)`
+- `fullNaturalJoin(t1, t2, ...)`
+- `innerJoinUsing(t1, t2, a1, a2, ...)`
+- `leftJoinUsing(t1, t2, a1, a2, ...)`
+- `rightJoinUsing(t1, t2, a1, a2, ...)`
+- `fullJoinUsing(t1, t2, a1, a2, ...)`
+- `innerJoinOn(t1, t2, b)`
+- `leftJoinOn(t1, t2, b)`
+- `rightJoinOn(t1, t2, b)`
+- `fullJoinOn(t1, t2, b)`
+
+(t\* = Table or Join; a\* = Attributes; b = Boolean Modifier)
+
+#### Aggregations
 - `count(a)`
 - `sum(a)`
 - `avg(a)`

src/dbStructure.ts

@@ -1,7 +1,7 @@
 import { Attribute, Table } from "./db";
 import { Handler } from "./defaultHandler";
 import { QueryBuilder } from "./query";
-import { allModifierInput, onAction, primaryData, serializeReturn } from "./types";
+import { allModifierInput, joinElements, joinType, onAction, primaryData, serializeReturn } from "./types";
 
 export class Datatype {
     type: string;
@@ -42,11 +42,62 @@ export class Aggregation {
         return handler.aggregations[this.t as keyof typeof handler.aggregations](handler, this.a);
     }
 }
-export class Joins {
+export interface Joins {
-
+    serialize(handler: Handler): QueryBuilder 
-    serialize(handler: Handler): QueryBuilder {
-        return new QueryBuilder();
 }
+export class joinNatural implements Joins{
+    tables: joinElements[];
+    type: joinType;
+    constructor(tables:joinElements[], type: joinType){
+        this.tables = tables;
+        this.type = type;
+    }    
+    serialize(handler: Handler): QueryBuilder {
+        return handler.joins.natural(handler,this);
+    }
+    
+}
+export class onJoin implements Joins{
+    tableA: joinElements;
+    tableB: joinElements;
+    type: joinType;
+    on: BooleanModifier;
+    constructor(tableA: joinElements, tableB: joinElements, type: joinType, on: BooleanModifier){
+        this.tableA = tableA;
+        this.tableB = tableB;
+        this.type = type;
+        this.on = on;
+    }
+    serialize(handler: Handler): QueryBuilder {
+        return handler.joins.on(handler,this);
+    }
+    
+}
+export class usingJoin implements Joins{
+    tableA: joinElements;
+    tableB: joinElements;
+    type: joinType;
+    using: Attribute[];
+    constructor(tableA: joinElements, tableB: joinElements, type: joinType, using: Attribute[]){
+        this.tableA = tableA;
+        this.tableB = tableB;
+        this.type = type;
+        this.using = using;
+    }
+    serialize(handler: Handler): QueryBuilder {
+        return handler.joins.using(handler,this);
+    }
+    
+}
+export class joinCross implements Joins{
+    tables: joinElements[];
+    constructor(tables:joinElements[]){
+        this.tables = tables;
+    } 
+    serialize(handler: Handler): QueryBuilder {
+        return handler.joins.cross(handler,this);
+    }
+    
 }
 
 export interface Constraint {

src/defaultHandler.ts

@@ -1,12 +1,10 @@
 import { Attribute, DB, Table } from "./db"
-import { Aggregation, checkConstraint, Constraint, Datatype, foreignConstraint, Modifier, uniqueConstraint } from "./dbStructure"
+import { Aggregation, checkConstraint, joinCross, Datatype, foreignConstraint, Modifier, joinNatural, onJoin, uniqueConstraint, usingJoin } from "./dbStructure"
 import { insertQuery, Query, QueryBuilder, removeQuery, selectQuery, updateQuery } from "./query"
-import { allModifierInput, onAction, primaryData, serializeReturn } from "./types"
+import { allModifierInput, joinType, onAction, primaryData } from "./types"
 
 export class Handler {
     async syncDB(db: DB, handler: Handler, deleteInDB: boolean = false) {
-        console.log("start sync");
-
         let gd = new QueryBuilder();
         gd.addCode(`SELECT * FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE where CONSTRAINT_SCHEMA = `);
         gd.addInjection(db.name);
@@ -237,7 +235,14 @@ export class Handler {
             const builder = new QueryBuilder();
             builder.addCode("select ");
             builder.append(joinArg(", ")(handler, q.attr));
-            builder.addCode(` from ${q.from == null ? 'DUAL' : q.from.serialize(handler)}`);
+            builder.addCode(` from `);
+            if(q.from == null){
+                builder.addCode(" DUAL");
+            }else if (q.from instanceof Table){
+                builder.addCode(q.from.serialize(handler));
+            }else{
+                builder.append(q.from.serialize(handler));
+            }
             if (q.whereD) {
                 builder.addCode(" where ");
                 builder.append(q.whereD.serialize(handler));
@@ -527,6 +532,91 @@ export class Handler {
         max: (handler: Handler, a: Attribute): QueryBuilder => new QueryBuilder([{ data: "max(" + a.toString(handler) + ")" }]),
     }
 
+    joins = {
+        natural: (handler: Handler, j: joinNatural) => {
+            const qb = new QueryBuilder();
+            for (let i = 0; i < j.tables.length; i++) {
+                const t = j.tables[i];
+                if (t instanceof Table) qb.addCode(t.serialize(handler));
+                else {
+                    qb.addCode("(");
+                    qb.append(t.serialize(handler));
+                    qb.addCode(")");
+                }
+                if (i + 1 < j.tables.length) {
+                    qb.addCode(" natural ");
+                    if (j.type == joinType.left) qb.addCode("left");
+                    if (j.type == joinType.right) qb.addCode("right");
+                    if (j.type == joinType.full) qb.addCode("full");
+                    qb.addCode(" join ");
+                }
+            }
+            return qb;
+        },
+        using: (handler: Handler, j: usingJoin) => {
+            const qb = new QueryBuilder();
+            if (j.tableA instanceof Table) qb.addCode(j.tableA.serialize(handler));
+            else {
+                qb.addCode("(");
+                qb.append(j.tableA.serialize(handler));
+                qb.addCode(")");
+            }
+            qb.addCode(" ");
+            if (j.type == joinType.left) qb.addCode("left ");
+            if (j.type == joinType.right) qb.addCode("right ");
+            if (j.type == joinType.full) qb.addCode("full ");
+            qb.addCode("join ");
+            if (j.tableA instanceof Table) qb.addCode(j.tableA.serialize(handler));
+            else {
+                qb.addCode("(");
+                qb.append(j.tableA.serialize(handler));
+                qb.addCode(")");
+            }
+            qb.addCode(" using (");
+            qb.addCodeCommaSeperated(j.using.map(t => t.serialize(handler)));
+            qb.addCode(")");
+            return qb;
+        },
+        on: (handler: Handler, j: onJoin) => {
+            const qb = new QueryBuilder();
+            if (j.tableA instanceof Table) qb.addCode(j.tableA.serialize(handler));
+            else {
+                qb.addCode("(");
+                qb.append(j.tableA.serialize(handler));
+                qb.addCode(")");
+            }
+            qb.addCode(" ");
+            if (j.type == joinType.left) qb.addCode("left ");
+            if (j.type == joinType.right) qb.addCode("right ");
+            if (j.type == joinType.full) qb.addCode("full ");
+            qb.addCode("join ");
+            if (j.tableA instanceof Table) qb.addCode(j.tableA.serialize(handler));
+            else {
+                qb.addCode("(");
+                qb.append(j.tableA.serialize(handler));
+                qb.addCode(")");
+            }
+            qb.addCode(" on (");
+            qb.append(j.on.serialize(handler));
+            qb.addCode(")");
+            return qb;
+        },
+        cross: (handler: Handler, j: joinCross) => {
+            const qb = new QueryBuilder();
+            for (let i = 0; i < j.tables.length; i++) {
+                const t = j.tables[i];
+                if (t instanceof Table) qb.addCode(t.serialize(handler));
+                else {
+                    qb.addCode("(");
+                    qb.append(t.serialize(handler));
+                    qb.addCode(")");
+                }
+                if (i + 1 < j.tables.length) qb.addCode(" cross join ");
+            }
+            return qb;
+        }
+    }
+
     modifiers = {
         and: joinArg("and"),
         or: joinArg("or"),

src/funcs.ts

@@ -1,7 +1,7 @@
 import { Attribute, Table } from "./db";
-import { Aggregation, BooleanModifier, checkConstraint, Datatype, foreignConstraint, NumberModifier, StringModifier, uniqueConstraint } from "./dbStructure";
+import { Aggregation, BooleanModifier, checkConstraint, Datatype, foreignConstraint, joinCross, joinNatural, usingJoin, onJoin, NumberModifier, StringModifier, uniqueConstraint } from "./dbStructure";
 import { insertQuery, removeQuery, selectQuery, updateQuery } from "./query";
-import { allModifierInput, selectElements, selectFromElements } from "./types";
+import { allModifierInput, joinType, selectElements, selectFromElements } from "./types";
 
 //modifiers
 export const and = (...args: BooleanModifier[]) => new BooleanModifier("and", args);
@@ -28,6 +28,25 @@ export const avg = (a: Attribute) => new Aggregation("avg", a);
 export const min = (a: Attribute) => new Aggregation("min", a);
 export const max = (a: Attribute) => new Aggregation("max", a);
 
+//join
+
+export const crossJoin = (...tables: Table[]) => new joinCross(tables);
+
+export const naturalJoin = (...tables: Table[]) => new joinNatural(tables, joinType.inner);
+export const leftNaturalJoin = (...tables: Table[]) => new joinNatural(tables, joinType.left);
+export const rightNaturalJoin = (...tables: Table[]) => new joinNatural(tables, joinType.right);
+export const fullNaturalJoin = (...tables: Table[]) => new joinNatural(tables, joinType.full);
+
+export const innerJoinUsing = (tableA: Table, tableB: Table, ...using: Attribute[]) => new usingJoin(tableA, tableB, joinType.inner, using);
+export const leftJoinUsing = (tableA: Table, tableB: Table, ...using: Attribute[]) => new usingJoin(tableA, tableB, joinType.left, using);
+export const rightJoinUsing = (tableA: Table, tableB: Table, ...using: Attribute[]) => new usingJoin(tableA, tableB, joinType.right, using);
+export const fullJoinUsing = (tableA: Table, tableB: Table, ...using: Attribute[]) => new usingJoin(tableA, tableB, joinType.full, using);
+
+export const innerJoinOn = (tableA: Table, tableB: Table, on: BooleanModifier) => new onJoin(tableA, tableB, joinType.inner, on);
+export const leftJoinOn = (tableA: Table, tableB: Table, on: BooleanModifier) => new onJoin(tableA, tableB, joinType.left, on);
+export const rightJoinOn = (tableA: Table, tableB: Table, on: BooleanModifier) => new onJoin(tableA, tableB, joinType.right, on);
+export const fullJoinOn = (tableA: Table, tableB: Table, on: BooleanModifier) => new onJoin(tableA, tableB, joinType.full, on);
+
 //query
 export const select = (args: selectElements[], from: selectFromElements) => new selectQuery(args, from);
 export const insert = (...attrs: Attribute[]) => new insertQuery(attrs);

src/types.ts

@@ -7,6 +7,7 @@ export type allModifierInput = primaryData | Modifier | selectQuery | Attribute
 
 export type selectElements = primaryData | Attribute | Aggregation | selectQuery
 export type selectFromElements = Table | Joins | null;
+export type joinElements = Table | Joins;
 
 export type serializeReturn = [string, primaryData[]];
 
@@ -48,3 +49,11 @@ export enum onAction {
     setNull,
     setDefault
 }
+
+export enum joinType {
+    inner,
+    left,
+    right,
+    full,
+    cross
+}