es-entity/lib/model/WhereExprBuilder.ts

ORM framework for Node js based on Ecmascript 6 and Typescript.

import Expression from '../sql/Expression.js';
import Operator from '../sql/types/Operator.js';
import BaseExprBuilder from './BaseExprBuilder.js';
import { KeyOf, OperandType } from './types.js';

class WhereExprBuilder<T> extends BaseExprBuilder<T> {
  private _argExp(operand: OperandType<T, keyof T>) {
    if (operand instanceof Expression) {
      return operand;
    } else {
      let res = new Expression('?');
      res.args = res.args.concat(operand);
      return res;
    }
  }

  // Comparison Operators
  eq<K extends KeyOf<T>>(propName: K, operand: OperandType<T, K>) {
    return new Expression(null, Operator.Equal, this._expr(propName), this._argExp(operand));
  }
  neq<K extends KeyOf<T>>(propName: K, operand: OperandType<T, K>) {
    return new Expression(null, Operator.NotEqual, this._expr(propName), this._argExp(operand));
  }
  lt<K extends KeyOf<T>>(propName: K, operand: OperandType<T, K>) {
    return new Expression(null, Operator.LessThan, this._expr(propName), this._argExp(operand));
  }
  gt<K extends KeyOf<T>>(propName: K, operand: OperandType<T, K>) {
    return new Expression(null, Operator.GreaterThan, this._expr(propName), this._argExp(operand));
  }
  lteq<K extends KeyOf<T>>(propName: K, operand: OperandType<T, K>) {
    return new Expression(null, Operator.LessThanEqual, this._expr(propName), this._argExp(operand));
  }
  gteq<K extends KeyOf<T>>(propName: K, operand: OperandType<T, K>) {
    return new Expression(null, Operator.GreaterThanEqual, this._expr(propName), this._argExp(operand));
  }

  // Logical Operators
  and<K extends KeyOf<T>>(propName: K, operand: Expression) {
    return new Expression(null, Operator.And, this._expr(propName), this._argExp(operand));
  }
  or<K extends KeyOf<T>>(propName: K, operand: Expression): Expression {
    return new Expression(null, Operator.Or, this._expr(propName), this._argExp(operand));
  }
  not<K extends KeyOf<T>>(propName: K): Expression {
    return new Expression(null, Operator.Not, this._expr(propName));
  }

  // Inclusion Funtions
  in<K extends KeyOf<T>>(propName: K, ...operand: OperandType<T, K>[]) {
    let vals = operand.map(val => {
      let arg = new Expression('?');
      arg.args = arg.args.concat(val);
      return arg;
    });
    return new Expression(null, Operator.In, this._expr(propName), ...vals);
  }

  between<K extends KeyOf<T>>(propName: K, first: OperandType<T, K>, second: OperandType<T, K>) {
    return new Expression(null, Operator.Between, this._expr(propName), this._argExp(first), this._argExp(second));
  }

  like<K extends KeyOf<T>>(propName: K, operand: OperandType<T, K>) {
    return new Expression(null, Operator.Like, this._expr(propName), this._argExp(operand));
  }

  // Null Checks
  IsNull<K extends KeyOf<T>>(propName: K) {
    return new Expression(null, Operator.IsNull, this._expr(propName));
  }
  IsNotNull<K extends KeyOf<T>>(propName: K) {
    return new Expression(null, Operator.IsNotNull, this._expr(propName));
  }

  // Arithmatic Operators
  plus<K extends KeyOf<T>>(propName: K, operand: OperandType<T, K>) {
    return new Expression(null, Operator.Plus, this._expr(propName), this._argExp(operand));
  }
  minus<K extends KeyOf<T>>(propName: K, operand: OperandType<T, K>) {
    return new Expression(null, Operator.Minus, this._expr(propName), this._argExp(operand));
  }
  multiply<K extends KeyOf<T>>(propName: K, operand: OperandType<T, K>) {
    return new Expression(null, Operator.Multiply, this._expr(propName), this._argExp(operand));
  }
  devide<K extends KeyOf<T>>(propName: K, operand: OperandType<T, K>) {
    return new Expression(null, Operator.Devide, this._expr(propName), this._argExp(operand));
  }

  // Group Functions
  sum<K extends KeyOf<T>>(propName: K) {
    return new Expression(null, Operator.Sum, this._expr(propName));
  }
  min<K extends KeyOf<T>>(propName: K) {
    return new Expression(null, Operator.Min, this._expr(propName));
  }
  max<K extends KeyOf<T>>(propName: K) {
    return new Expression(null, Operator.Max, this._expr(propName));
  }
  count<K extends KeyOf<T>>(propName: K) {
    return new Expression(null, Operator.Count, this._expr(propName));
  }
  average<K extends KeyOf<T>>(propName: K) {
    return new Expression(null, Operator.Avg, this._expr(propName));
  }
}

export default WhereExprBuilder;