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

@@ -1,7 +1,7 @@
 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) {
@@ -237,7 +237,14 @@ 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));
@@ -305,7 +312,7 @@ export class Handler {
             }
             return qb;
         },
-        remove: (handler: Handler, q: removeQuery): QueryBuilder =>{
+        remove: (handler: Handler, q: removeQuery): QueryBuilder => {
             const qb = new QueryBuilder();
             qb.addCode("DELETE FROM ");
             qb.addCode(q.table.serialize(handler));
@@ -527,6 +534,91 @@ 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
+}