easy-mssql/operations/data_types.ts

This is a simple and easy to use mssql library for node.js

/**
 * This class is used to create an object of any data type.
 */
class Any {
    value: any;

    constructor(value: any) {
        this.value = value;
    }
}

/**
 * This function is used to check if the value is null.
 * 
 * @param value - The data to be checked
 * @returns boolean - Returns true if the value is null, false otherwise
 */
const isNull = (value: any): boolean => value === null;

/**
 * This object contains functions to convert values to specific data types.
 */
const types = {
    /**
     * Converts a value to a string.
     * @param value - The value to be converted
     * @returns string | null - The converted string value or null
     */
    string: (value: any): string | null => {
        return isNull(value) ? null : String(value);
    },

    /**
     * Converts a value to a number.
     * @param value - The value to be converted
     * @returns number | null - The converted number value or null
     */
    number: (value: any): number | null => {
        return isNull(value) ? null : Number(value);
    },

    /**
     * Converts a value to a boolean.
     * @param value - The value to be converted
     * @returns boolean | null - The converted boolean value or null
     */
    boolean: (value: any): boolean | null => {
        return isNull(value) ? null : Boolean(value);
    },

    /**
     * Converts a value to a Date.
     * @param value - The value to be converted
     * @returns Date | null - The converted Date value or null
     */
    date: (value: any): Date | null => {
        return isNull(value) ? null : new Date(value);
    },

    /**
     * Converts a value to a Buffer.
     * @param value - The value to be converted
     * @returns Buffer | null - The converted Buffer value or null
     */
    buffer: (value: any): Buffer | null => {
        return isNull(value) ? null : Buffer.from(value);
    },

    /**
     * Converts a value to an Array.
     * @param value - The value to be converted
     * @returns any[] | null - The converted Array value or null
     */
    array: (value: any): any[] | null => {
        return isNull(value) ? null : Array(value);
    },

    /**
     * Wraps a value in an Any object.
     * @param value - The value to be wrapped
     * @returns Any | null - The wrapped value or null
     */
    any: (value: any): Any | null => {
        return isNull(value) ? null : new Any(value);
    }
};

type TypeConverter = (value: any) => any;

/**
 * This object contains the data types of SQL Server and their corresponding JavaScript data type converters.
 */
export const sqlTypes: Record<string, TypeConverter> = {
    "char": types.string,
    "varchar": types.string,
    "text": types.string,
    "nchar": types.string,
    "nvarchar": types.string,
    "ntext": types.string,
    "binary": types.buffer,
    "varbinary": types.buffer,
    "image": types.buffer,
    "bit": types.boolean,
    "tinyint": types.number,
    "smallint": types.number,
    "int": types.number,
    "bigint": types.number,
    "decimal": types.number,
    "numeric": types.number,
    "smallmoney": types.number,
    "money": types.number,
    "float": types.number,
    "real": types.number,
    "datetime": types.date,
    "datetime2": types.date,
    "smalldatetime": types.date,
    "date": types.date,
    "time": types.string,
    "datetimeoffset": types.string,
    "timestamp": types.buffer,
    "uniqueidentifier": types.string,
    "xml": types.string,
    "table": types.array,
    "cursor": types.any,
    "sql_variant": types.any,
};