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ezobjects-mysql

13.0.3 • Public • Published

EZ Objects - MySQL Edition - v13.0.3

EZ Objects (MySQL Edition) is a Node.js module (that can also be usefully browserify'd) that aims to save you lots of time writing class objects that are strictly typed in JavaScript, and can be tied directly to MySQL database tables by way of a mix of automatically generated insert/update/load/delete class method signatures. All you have to do is create simple class configurations for each of your objects and then create them using the exported ezobjects.createClass() function.

Want EZ Objects Without The MySQL?

EZ Object's capabilities has been split into multiple packages to target the needs of specific users. This is a branch of the original ezobjects module that preserves the original MySQL table-linked capability, while the original ezobjects has had it removed so those who don't need the database storage can remove the dependency. It also worked out better that way so that ezobjects types can be different than MySQL types, which might be different from another database's types, etc. If you don't need MySQL capability, you can find the original ezobjects package on npm or GitHub.

Installation

npm i ezobjects-mysql

Required Property

IMPORTANT: Each of your MySQL EZ Objects must include a property of EZ Object type int named id that will be automatically configured to serve as an auto-incrementing primary index in the MySQL table that you are linking your object to. The load method will generally be based off the id field, unless you specify a otherSearchProperty to load by as an alternative. Also note that you must also use the mysql-await module for your database connection for compatability purposes and to allow async/await functionality. It is simply a wrapper for the popular mysql module and takes no time to scan and see that nothing fishy is going on.

Basic Example

It might be best to start off with a basic example where we do the following:

  1. Configure an EZ Object called DatabaseRecord
  2. Configure another EZ Object called UserAccount that extends from DatabaseRecord
  3. Create the classes for both using the ezobjects.createClass() function
  4. Create my user_accounts MySQL table using the ezobjects.createTable() function (if it doesn't already exist)
  5. Demonstrate the instatiation of an EZ Object and use of the getters, setters, and insert/update/load/delete class methods that EZ Objects automatically provides.

See below:

const ezobjects = require(`ezobjects-mysql;`);
const fs = require(`fs`);
const mysql = require(`mysql-await`);

/** 
 * Load external MySQL configuration which uses the following JSON 
 * format:
 * {
 *   "host"          : "localhost",
 *   "user"          : "ezobjects",
 *   "password"      : "myPassword",
 *   "database"      : "ezobjects"
 * }
 */
const configMySQL = JSON.parse(fs.readFileSync(`mysql-config.json`));

/** 
 * Create a connection object for the MySQL database using our MySQL 
 * module async/await wrapper.
 */
const db = mysql.createConnection(configMySQL);

/** 
 * Configure a new EZ Object called DatabaseRecord with the required 
 * `id` property that will serve as the auto-incrementing primary index.
 */
const configDatabaseRecord = {
  className: `DatabaseRecord`,
  properties: [
    { name: `id`, type: `int` }
  ]
};

/** 
 * Create the DatabaseRecord class -- Note: This object is not linked
 * to a MySQL table directly, as it has no `tableName` property, but
 * it can be extended by EZ Objects that are linked to tables.
 */
const DatabaseRecord = ezobjects.createClass(configDatabaseRecord);

/** 
 * Configure a new EZ Object called UserAccount that extends from the 
 * DatabaseRecord object and adds several additional properties,
 * including an array of `int` property and a MySQL index.
 */
const configUserAccount = {
  tableName: `user_accounts`,
  className: `UserAccount`,
  extends: DatabaseRecord,
  extendsConfig: configDatabaseRecord,
  properties: [
    { name: `username`, type: `varchar`, length: 20 },
    { name: `firstName`, type: `varchar`, length: 20 },
    { name: `lastName`, type: `varchar`, length: 20 },
    { name: `checkingBalance`, type: `decimal`, length: 17, decimals: 2 },
    { name: `permissions`, type: `Array`, arrayOf: { type: `int` } },
    { name: `favoriteDay`, type: `date` }
  ],
  indexes: [
    { name: `username`, type: `BTREE`, columns: [ `username` ] }
  ]
};

/** Create the UserAccount class */
const UserAccount = ezobjects.createClass(configUserAccount);

/** Let's use a self-executing async wrapper so we can await results */
(async () => {
  try {
    /** 
     * Create a new UserAccount called `userAccount`, initializing with 
     * plain object passed to constructor.
     */
    const userAccount = new UserAccount({
      username: `richlowe`,
      firstName: `Rich`,
      lastName: `Lowe`,
      checkingBalance: 4.32,
      permissions: [1, 3, 5],
      favoriteDay: new Date(`01-01-2018`)
    });

    /** 
     * Test if `userAccount` is an instance of DatabaseRecord using
     * the included `instanceOf` helper function.
     */
    console.log(ezobjects.instanceOf(userAccount, `DatabaseRecord`));

    /** Create `user_accounts` table if it doesn`t already exist */
    await ezobjects.createTable(configUserAccount, db);

    /** Insert `userAccount` into the database */
    await userAccount.insert(db);
    
    /** Log `userAccount` (should have automatically incremented ID now) */
    console.log(userAccount);

    /** Capture ID of new record */
    const id = userAccount.id();
    
    /** Change the property values a bit */
    userAccount.checkingBalance(50.27);
    userAccount.firstName(`Richard`);
    userAccount.favoriteDay(new Date(`09-01-2019`));

    /** Update `userAccount` in the database */
    await userAccount.update(db);

    /** Log `userAccount` (should have `checkingBalance` of 50.27) */
    console.log(userAccount);

    /** Create another new UserAccount called `anotherUserAccount` */
    const anotherUserAccount = new UserAccount();
    
    /** 
     * Using the ID captured from the previous insert operation, load 
     * the record from database.
     */
    await anotherUserAccount.load(id, db, [`username`, `firstName`, `lastName`]);

    /** Log `anotherUserAccount` (should match last `userAccount`) */
    console.log(anotherUserAccount);

    /** Delete `anotherUserAccount` from the database */
    await anotherUserAccount.delete(db);    
  } catch ( err ) {
    /** Cleanly log any errors */
    console.log(err.message);
  } finally {
    /** Close database connection */
    await db.awaitEnd();
  }
})();

Expected Output

true
UserAccount {
  _id: 1,
  _username: `richlowe`,
  _firstName: `Rich`,
  _lastName: `Lowe`,
  _checkingBalance: 4.32,
  _permissions: [ 1, 3, 5 ],
  _favoriteDay: 2018-01-01T06:00:00.000Z }
UserAccount {
  _id: 1,
  _username: `richlowe`,
  _firstName: `Richard`,
  _lastName: `Lowe`,
  _checkingBalance: 50.27,
  _permissions: [ 1, 3, 5 ],
  _favoriteDay: 2019-09-01T05:00:00.000Z }
UserAccount {
  _id: 0,
  _username: `richlowe`,
  _firstName: `Richard`,
  _lastName: `Lowe`,
  _checkingBalance: 0,
  _permissions: [],
  _favoriteDay: null }

EZ Object Types

See the table below for a list of EZ Object types along with their JavaScript type and default value, as well as the default MySQL type.

EZ Object Type JavaScript Type Default JavaScript Value Default MySQL Type
bit Buffer Buffer.from([]) BIT
tinyint Number 0 TINYINT
smallint Number 0 SMALLINT
mediumint Number 0 MEDIUMINT
int Number 0 INT
bigint Number 0 BIGINT
real Number 0 REAL
double Number 0 DOUBLE
float Number 0 FLOAT
decimal Number 0 DECIMAL
numeric Number 0 NUMERIC
time String '00:00:00' TIME
char String '' CHAR
varchar String '' VARCHAR
binary Buffer Buffer.from([]) BINARY
varbinary Buffer Buffer.from([]) VARBINARY
tinyblob Buffer Buffer.from([]) TINYBLOB
blob Buffer Buffer.from([]) BLOB
mediumblob Buffer Buffer.from([]) MEDIUMBLOB
longblob Buffer Buffer.from([]) LONGBLOB
tinytext String '' TINYTEXT
text String '' TEXT
mediumtext String '' MEDIUMTEXT
longtext String '' LONGTEXT
set Set new Set() SET
boolean Boolean false TINYINT
function function function () { } TEXT
object Object {} TEXT
MyEZObject MyEZObject null TINYTEXT
Array[bit] Array [] TEXT
Array[tinyint] Array [] TEXT
Array[smallint] Array [] TEXT
Array[mediumint] Array [] TEXT
Array[int] Array [] TEXT
Array[bigint] Array [] TEXT
Array[real] Array [] TEXT
Array[double] Array [] TEXT
Array[float] Array [] TEXT
Array[decimal] Array [] TEXT
Array[numeric] Array [] TEXT
Array[time] Array [] TEXT
Array[char] Array [] TEXT
Array[varchar] Array [] TEXT
Array[binary] Array [] TEXT
Array[varbinary] Array [] TEXT
Array[tinyblob] Array [] TEXT
Array[blob] Array [] MEDIUMTEXT
Array[mediumblob] Array [] LONGTEXT
Array[longblob] Array [] LONGTEXT
Array[tinytext] Array [] TEXT
Array[text] Array [] MEDIUMTEXT
Array[mediumtext] Array [] LONGTEXT
Array[longtext] Array [] LONGTEXT
Array[set] Array [] TEXT
Array[boolean] Array [] TEXT
Array[function] Array [] MEDIUMTEXT
Array[object] Array [] MEDIUMTEXT
Array[MyEZObject] Array [] TEXT

Exported Functions

The EZ Objects module exports three functions:

ezobjects.createTable(objectConfig, db)

  • Parameter: objectConfig - Object - See Configuration Specifications
  • Parameter: db - MySQLConnection - Created using mysql-await module
  • Description: A function that creates a MySQL table corresponding to the configuration outlined in objectConfig, if it doesn't already exist.

ezobjects.createClass(objectConfig)

  • Parameter: objectConfig - Object - See Configuration Specifications
  • Returns: mixed - Your custom created EZ Object in all of its glory
  • Description: A function that creates an ES6 class corresponding to the configuration outlined in objectConfig, with constructor, initializer, getters, setters, and also delete, insert, load, and update if tableName is configured. The resulting class is both returned from the function and exported from the ezobjects-mysql module.

ezobjects.instanceOf(obj, constructorName)

  • Parameter: obj - mixed - Any object created using an EZ Object class
  • Parameter: constructorName - string
  • Returns: boolean
  • Description: A function that tests whether a given object obj is an instance of class constructorName, meaning constructorName is the name of the object's constructor, or the name of any constructor in the object's prototype chain.

Basic EZ Object Method Signatures

These are the object method signatures even the most basic of EZ Objects will have:

new MyObject([data])

  • Parameter: data - Object - (optional)
  • Description: Create a new MyObject object and initialize it using either defaults or any provided key/value pairs in the plain object data. Keys can either be equal to the name of a property, or they can have an underscore before the name of a property, as would be the case if you were to JSON.stringify() and then JSON.parse() an EZ Object. This allows for easy transferability in cases where JSON is used as the transfer medium.

new MyObject([data])

  • Parameter: data - string - (optional)
  • Description: Create a new MyObject object and initialize it using either defaults or any provided key/value pairs in the JSON encoded string data. Keys can either be equal to the name of a property, or they can have an underscore before the name of a property, as would be the case if you were to JSON.stringify() an EZ Object. This allows for easy transferability in cases where JSON is used as the transfer medium.

new MyObject([data])

  • Parameter: data - MyObject - (optional)
  • Description: Create a new MyObject object and initialize it using either defaults or any getter functions in the EZ Object data.

MyObject.init([data])

  • Parameter: data - Object
  • Description: Initialize this object using either defaults or any provided key/value pairs in the plain object data. Keys can either be equal to the name of a property, or they can have an underscore before the name of a property, as would be the case if you were to JSON.stringify() and then JSON.parse() an EZ Object. This allows for easy transferability in cases where JSON is used as the transfer medium. This is also the method used by the constructor.

MyObject.init([data])

  • Parameter: data - Object
  • Description: Initialize this object using either defaults or any provided key/value pairs in the JSON0-encoded string data. Keys can either be equal to the name of a property, or they can have an underscore before the name of a property, as would be the case if you were to JSON.stringify() and then JSON.parse() an EZ Object. This allows for easy transferability in cases where JSON is used as the transfer medium. This is also the method used by the constructor.

MyObject.init([data])

  • Parameter: data - MyObject
  • Description: Initialize this object using either defaults or any provided getter functions in the EZ Object data. This is also the method used by the constructor.

In addition, each property you define will have a single method that is a getter and setter, and it will have the following signatures:

MyObject.myProperty()

  • Returns: mixed
  • Description: Get the value of the property.

MyObject.myProperty(value)

  • Parameter: value - mixed
  • Throws: TypeError if value is not of the correct javascript data type for myProperty
  • Returns: this
  • Description: Set the value of the property, throwing an error if the javascript data type does not match the configuration, this is how the strict typing is implemented. This signature returns this to allow for set call chaining.

MySQL EZ Object Method Signatures

These are the object method signatures that will additionally be provided if your configuration contains a tableName, meaning it's intended to be linked to a MySQL table:

MyObject.delete(db)

  • Parameter: db - Object
  • Description: Delete the record in database db, table tableName, that has its id field equal to the id property of this object.

MyObject.insert(db)

  • Parameter: db - Object
  • Description: Insert this object's property values into the database db, table tableName, and store the resulting insertId in the id property of this object.

MyObject.load(mysqlRow[, db[, propertiesToInclude[, options]]]))

  • Parameter: mysqlRow RowDataPacket - A MySQL RowDataPacket returned as part of a MySQL result set
  • Parameter: db - Object - (optional)
  • Parameter: propertiesToInclude - Array - (optional) Properties to load (or not load if inverse option is used)
  • Parameter: options - Object - (optional) Desired options (currently just inverse = true/false)
  • Description: Load any configured properties from key/value pairs in mysqlRow. You can optionally pass the database db if you need it to be provided as a third argument to any loadTransform handlers defined for configured properties.

MyObject.load(obj[, db,[ propertiesToInclude[, options]]]))

  • Parameter: obj Object
  • Parameter: db - Object - (optional)
  • Parameter: propertiesToInclude - Array - (optional) Properties to load (or not load if inverse option is used)
  • Parameter: options - Object - (optional) Desired options (currently just inverse = true/false)
  • Description: Load any configured properties from key/value pairs in obj. You can optionally pass the database db if you need it to be provided as a third argument to any loadTransform handlers defined for configured properties.

MyObject.load(id, db[, propertiesToInclude[, options]]))

  • Parameter: id number The value of the id property of the record you wish to load
  • Parameter: db - Object
  • Parameter: propertiesToInclude - Array - (optional) Properties to load (or not load if inverse option is used)
  • Parameter: options - Object - (optional) Desired options (currently just inverse = true/false)
  • Description: Load the record in database db, table tableName, that has its id field equal to provided id parameter.

MyObject.load(propertyValue, db[, propertiesToInclude[, options]])

  • Parameter: propertyValue - mixed - The value of the otherSearchProperty property of the record you wish to load
  • Parameter: db - Object
  • Parameter: propertiesToInclude - Array - (optional) Properties to load (or not load if inverse option is used)
  • Parameter: options - Object - (optional) Desired options (currently just inverse = true/false)
  • Description: Load the record in database db, table tableName, that has its otherSearchProperty field equal to provided propertyValue parameter. Here, the actual field name of otherSearchProperty is provided in the object configuration, see the configuration section below.

MyObject.load(url[, db])

  • Parameter: url - string - The URL of a back-end that provides JSON data compatible with this object's initializer
  • Parameter: db - Object
  • Description: Load any configured properties from the JSON-encoded key/value pairs obtained from url. You can optionally pass the database db if you need it to be provided as a third argument to any loadTransform handlers defined for configured properties.
  • Note: This signature is useful only when your classes are standalone browserify'd and requires you to implement a backend at url that will output the JSON. (This signature no longer requires jQuery to use)

MyObject.update(db)

  • Parameter: db - Object
  • Description: Update the record in database db, table tableName, with its id field equal to the id property of this object, using this object's property values.

Configuration Specifications

See the following for how to configure your EZ Objects:

A basic MySQL object configuration can have the following:

  • className - string - (required) Name of the class
  • properties - Array - (optional) An array of property configurations that the object (and MySQL table, if applicable) should have corresponding properties for
  • extends - mixed - (optional) The class that the new EZ Object should be extended from [required to extend EZ Object]
  • extendsConfig - object - (optional) The EZ Object configuration for the EZ Object that is being extended from [required to extend EZ Object]
  • indexes - Array - (optional) An array of MySQL index configurations that should be created in the MySQL table

A table-linked MySQL object configuration can also have the following:

  • tableName - string - (optional) Provide if object should be linked with MySQL database table
  • otherSearchProperty - string - (optional) The name of a unique property that you want to be able to load with as an alternative to the mandatory id property. Note the id property is still required.
  • url - string - (optional) The URL of a back-end that will provide a JSON.stringify output of the EZ Object for browserify'd loading of the object using an AJAX background request. For now, the URL must take the ID # of the record at the very end, i.e. http://go.to/myObject/load/{ID#}

A basic property configuration can have the following:

  • name - string - (required) Name of the property, must conform to both JavaScript and MySQL rules
  • type - string - (optional) EZ Object type that the property must be equal to -- types can be bit, tinyint, smallint, mediumint, int, bigint, real, double, float, decimal, numeric, date, time, timestamp, datetime, char, varchar, binary, varbinary, tinyblob, blob, mediumblob, longblob, tinytext, text, mediumtext, longtext, set, boolean, function, object, any other valid object constructor name, or array where arrayOf is provided with information about the array element types. [either type or instanceOf is required]
  • instanceOf - string - (optional) JavaScript class constructor name that the property must be an instance of [either type or instanceOf is required]
  • default - mixed - (optional) Sets the default value for the property in the class object
  • allowNull - boolean - (optional) Indicates the property can be null, default is that only date, datetime, timestamp, and custom object types are nullable
  • arrayOf - object - (required for type array) A plain object containing the EZ Object type or instanceOf of the elements of the array -- types can be bit, tinyint, smallint, mediumint, int, bigint, real, double, float, decimal, numeric, date, time, timestamp, datetime, char, varchar, binary, varbinary, tinyblob, blob, mediumblob, longblob, tinytext, text, mediumtext, longtext, set, boolean, function, object, or any other valid object constructor name (which can alternatively be used with instanceOf instead). Should also include any other relevant MySQL attributes for the stored properties, such as allowNull, length, unsigned, etc, though not all specifics will be used as the current practice is to store arrays using the family of MySQL text-type and blob-type fields. That may change in future versions though where they may be stored in transparent sub-tables, so it's best practice to include the MySQL specifics if you desire future compatability. Important Note: Arrays also therefore don't yet have unlimited size capability, and if the MySQL type used by default isn't big enough, it will be up to you to manually override the mysqlType of the array property configuration. [either type or instanceOf is required]
  • setTransform(x, propertyConfig) - function - (optional) Function that transforms and returns the property value prior to setting. The handler for this transform will also be passed the EZ Objects propertyConfig, if needed.

A MySQL property configuration can also have the following:

  • length - number - (optional) MySQL data length for the property [required for some data types like VARCHAR, optional for others where it's used to determine displayed precision on SELECT'ed data types like FLOAT]
  • decimals - number - (optional) Number of decimals that should be displayed for certain data types when SELECT'ed from the MySQL table
  • unique - boolean - (optional) Indicates the property is a UNIQUE KEY in the MySQL table
  • unsigned - boolean - (optional) Indicates the property should be unsigned in the MySQL table
  • zerofill - boolean - (optional) Indicates the property should be zero-filled in the MySQL table
  • comment - string - (optional) Indicates the property should note the provided comment in the MySQL table
  • characterSet - string - (optional) Indicates the property should use the provided charset in the MySQL table
  • collate - string - (optional) Indicates the property should use the provided collation in the MySQL table
  • autoIncrement - boolean - (optional) Indicates the property should be auto-incremented in the MySQL table
  • mysqlType - string - (optional) Provide the name of a valid MySQL data type in order to override the default, this can be especially useful for saving database space when you know you will be well under the default MySQL type sizes.
  • saveTransform(x, propertyConfig) - function - (optional) Provide a function that transforms and returns the property value prior to saving in the database in order to override the default. The handler for this transform will also be passed the EZ Objects propertyConfig, if needed.
  • loadTransform(x, propertyConfig, db) - function - (optional) Provide a function that transforms and returns the property value after loading from the database in order to override the default. The handler for this transform will also be passed the EZ Objects propertyConfig, if needed, along with the MySQL connection db iff it was provided as the third argument of the object's load method.

A MySQL index configuration can have the following (for MySQL table association only):

  • name - string - (required) Name of the index, can be arbitrary, but must be unique and not PRIMARY
  • columns - Array - (required) An array of strings containing property names to be indexed
  • type - string - (optional) Index type, can be BTREE or HASH, defaults to BTREE
  • keyBlockSize - number - (optional) Indicates the index should use the provided key block size
  • withParser - string - (optional) Indicates the index should use the provided parser
  • visible - boolean - (optional) Indicates the index should be visible
  • invisible - boolean - (optional) Indicates the index should be invisible

Default transforms

There are appropriate setTransform, saveTransform, and loadTransform methods for each EZ Object type. It is generally recommended that you don't override transforms unless you know what you are doing. For those who insist on doing so, first reference the default transforms in use in the ezobjectTypes array here

Defining Additional Class Methods

Defining additional class methods is really just a matter of adding the functions to the class prototype.

const ezobjects = require(`ezobjects-mysql`);

/** Configure material */
const materialConfig = {
  className: `Material`,
  tableName: `materials`,
  properties: [
    { name: `name`, type: `varchar`, length: 32 },
    { name: `density`, type: `double` },
    { name: `volume`, type: `double` }
  ]
};

/** Create material class */
const Material = ezobjects.createClass(materialConfig);

/** Simply add weight function to the class prototype after creating it with createClass() */
Material.prototype.weight = function () {
  return this.density() * this.volume();
};

Client Side Usage

There is another example available that demonstrates the browserify'd capabilities of EZ Objects by loading objects client-side over an Ajax back-end:

Wasted Space

It should be noted that it's possible for there to be considerable space wasted through too liberal use of large data types or arrays of large data types. In many cases this is not an issue, space is cheap right? However, in database tables with massive amounts of records, you may want to do a little due diligence and see if you need to override some of the default MySQL types.

For example, let's say that you have the following property config:

{ name: 'permissions', type: 'array', arrayOf: { type: 'int' } }

Well, each record will store that field as MySQL type TEXT which takes 65538 bytes of space per entry. If there are only, say, 25 permissions in your system numbered 1-25 or 0-24, then someone having all 25 permissions, stored using comma separated values in the database by EZ Objects, would not exceed the 255 bytes provided by a TINYTEXT field. You may therefore wish to override the default MySQL type in this case if you have thousands of users in your database, like so:

{ name: 'permissions', type: 'array', mysqlType: 'tinytext', arrayOf: { type: 'int' } }

Advanced Example With Each EZ Object Type

/** Require external modules */
const ezobjects = require(`ezobjects-mysql`);
const fs = require(`fs`);
const util = require(`util`);
const mysql = require(`mysql-await`);

/** Connect to the MySQL database using login info stored externally */
const db = mysql.createConnection(JSON.parse(fs.readFileSync(`mysql-config.json`)));

/** 
 * Configure a new EZ Object class called Example that tests out the
 * various data types supported.
 *
 * VERY IMPORTANT: 
 *
 * All MySQL EZ Objects MUST have an integer `id` field that will serve 
 * as an auto-incrementing primary index.
 */
const configExample = {
  tableName: `examples`,
  className: `Example`,
  properties: [
    { name: `id`, type: `int` },
    { name: `bitExample`, type: `bit`, length: 2 },
    { name: `tinyintExample`, type: `tinyint` },
    { name: `tinyintExample2`, type: `tinyint`, unsigned: true, zerofill: true },
    { name: `smallintExample`, type: `smallint` },
    { name: `mediumintExample`, type: `mediumint` },
    { name: `intExample`, type: `int` },
    { name: `bigintExample`, type: `bigint` },
    { name: `doubleExample`, type: `double` },
    { name: `floatExample`, type: `float` },
    { name: `decimalExample`, type: `decimal`, length: 5, decimals: 3 },
    { name: `numericExample`, type: `numeric`, length: 8, decimals: 5 },
    { name: `dateExample`, type: `date` },
    { name: `timeExample`, type: `time` },
    { name: `timestampExample`, type: `timestamp` },
    { name: `datetimeExample`, type: `datetime` },
    { name: `charExample`, type: `char`, length: 2 },
    { name: `charExample2`, type: `char`, length: 2, characterSet: `latin1`, collate: `latin1_german1_ci` },
    { name: `varcharExample`, type: `varchar`, length: 40 },
    { name: `varcharExample2`, type: `varchar`, length: 40, allowNull: true },
    { name: `binaryExample`, type: `binary`, length: 4 },
    { name: `varbinaryExample`, type: `varbinary`, length: 4 },
    { name: `tinyblobExample`, type: `tinyblob` },
    { name: `blobExample`, type: `blob` },
    { name: `mediumblobExample`, type: `mediumblob` },
    { name: `longblobExample`, type: `longblob` },
    { name: `tinytextExample`, type: `tinytext` },
    { name: `textExample`, type: `text` },
    { name: `mediumtextExample`, type: `mediumtext` },
    { name: `longtextExample`, type: `longtext` },
    { name: `setExample`, type: `set`, values: [`a`, `b`, `c`, `d`] },
    { name: `booleanExample`, type: `boolean` },
    { name: `functionExample`, type: `function` },
    { name: `plainObjectExample`, type: `object` },
    { name: `ezobjectTypeExample`, type: `OtherObj` },
    { name: `ezobjectInstanceExample`, instanceOf: `OtherObj` },
    { name: `ezobjectInstanceExample2`, instanceOf: `OtherObj`, store: false },
    
    { name: `bitArrayExample`, type: `Array`, arrayOf: { type: `bit`, length: 2 } },
    { name: `tinyintArrayExample`, type: `Array`, arrayOf: { type: `tinyint` } },
    { name: `tinyintArrayExample2`, type: `Array`, arrayOf: { type: `tinyint`, unsigned: true, zerofill: true } },
    { name: `smallintArrayExample`, type: `Array`, arrayOf: { type: `smallint` } },
    { name: `mediumintArrayExample`, type: `Array`, arrayOf: { type: `mediumint` } },
    { name: `intArrayExample`, type: `Array`, arrayOf: { type: `int` } },
    { name: `bigintArrayExample`, type: `Array`, arrayOf: { type: `bigint` } },
    { name: `doubleArrayExample`, type: `Array`, arrayOf: { type: `double` } },
    { name: `floatArrayExample`, type: `Array`, arrayOf: { type: `float` } },
    { name: `decimalArrayExample`, type: `Array`, arrayOf: { type: `decimal`, length: 5, decimals: 3 } },
    { name: `numericArrayExample`, type: `Array`, arrayOf: { type: `numeric`, length: 8, decimals: 5 } },
    { name: `dateArrayExample`, type: `Array`, arrayOf: { type: `date` } },
    { name: `timeArrayExample`, type: `Array`, arrayOf: { type: `time` } },
    { name: `timestampArrayExample`, type: `Array`, arrayOf: { type: `timestamp` } },
    { name: `datetimeArrayExample`, type: `Array`, arrayOf: { type: `datetime` } },
    { name: `charArrayExample`, type: `Array`, arrayOf: { type: `char`, length: 2 } },
    { name: `charArrayExample2`, type: `Array`, arrayOf: { type: `char`, length: 2, characterSet: `latin1`, collate: `latin1_german1_ci` } },
    { name: `varcharArrayExample`, type: `Array`, arrayOf: { type: `varchar`, length: 40 } },
    { name: `varcharArrayExample2`, type: `Array`, arrayOf: { type: `varchar`, length: 40, allowNull: true } },
    { name: `binaryArrayExample`, type: `Array`, arrayOf: { type: `binary`, length: 4 } },
    { name: `varbinaryArrayExample`, type: `Array`, arrayOf: { type: `varbinary`, length: 4 } },
    { name: `tinyblobArrayExample`, type: `Array`, arrayOf: { type: `tinyblob` } },
    { name: `blobArrayExample`, type: `Array`, arrayOf: { type: `blob` } },
    { name: `mediumblobArrayExample`, type: `Array`, arrayOf: { type: `mediumblob` } },
    { name: `longblobArrayExample`, type: `Array`, arrayOf: { type: `longblob` } },
    { name: `tinytextArrayExample`, type: `Array`, arrayOf: { type: `tinytext` } },
    { name: `textArrayExample`, type: `Array`, arrayOf: { type: `text` } },
    { name: `mediumtextArrayExample`, type: `Array`, arrayOf: { type: `mediumtext` } },
    { name: `longtextArrayExample`, type: `Array`, arrayOf: { type: `longtext` } },
    { name: `setArrayExample`, type: `Array`, arrayOf: { type: `set`, values: [`a`, `b`, `c`, `d`] } },
    { name: `booleanArrayExample`, type: `Array`, arrayOf: { type: `boolean` } },
    { name: `functionArrayExample`, type: `Array`, arrayOf: { type: `function` } },
    { name: `plainObjectArrayExample`, type: `Array`, arrayOf: { type: `object` } },
    { name: `ezobjectTypeArrayExample`, type: `Array`, arrayOf: { type: `OtherObj` } },
    { name: `ezobjectInstanceArrayExample`, type: `Array`, arrayOf: { instanceOf: `OtherObj` } },
    { name: `ezobjectInstanceArrayExample2`, type: `Array`, arrayOf: { instanceOf: `OtherObj` }, store: false },
  ],
  indexes: [
    { name: `varcharExample`, type: `BTREE`, columns: [ `varcharExample` ] },
    { name: `charExample`, type: `HASH`, columns: [ `charExample` ] }
  ]
};

/** Create the Example class */
const Example = ezobjects.createClass(configExample);

/** Configure a simple `other` object for use in the example */
const configOtherObj = {
  className: `OtherObj`,
  tableName: `other_objects`,
  properties: [
    { name: `id`, type: `int` },
    { name: `name`, type: `varchar`, length: 40 }
  ]
};

/** Create the OtherObj class */
const OtherObj = ezobjects.createClass(configOtherObj);

/** Configure an extended object for use in the example */
const configExtendedObj = {
  className: `ExtendedObj`,
  tableName: `extended_objects`,
  extends: OtherObj,
  extendsConfig: configOtherObj,
};

/** Create the ExtendedObj class */
const ExtendedObj = ezobjects.createClass(configExtendedObj); 

/** Self-executing async wrapper so we can await results */
(async () => {
  try {
    /** Create example table if it doesn`t already exist */
    await ezobjects.createTable(configExample, db);

    /** Create other object table if it doesn`t already exist */
    await ezobjects.createTable(configOtherObj, db);

    /** Create extended object table if it doesn`t already exist */
    await ezobjects.createTable(configExtendedObj, db);

    const otherObj1 = new OtherObj({ name: `Type Example 1` });
    const otherObj2 = new OtherObj({ name: `Type Example 2` });
    const extendedObj1 = new ExtendedObj({ name: `Instance Example Stored 1` });
    const extendedObj2 = new ExtendedObj({ name: `Instance Example Stored 2` });
    const extendedObj3 = new ExtendedObj({ name: `Instance Example Not Stored 1` });
    const extendedObj4 = new ExtendedObj({ name: `Instance Example Not Stored 2` });

    /** 
     * Insert other objects and extended objects into the database.
     * 
     * Note: This must be done before inserting the example so that
     * the other objects and extended objects have ID's to store!
     **/
    await otherObj1.insert(db);
    await otherObj2.insert(db);
    await extendedObj1.insert(db);
    await extendedObj2.insert(db);

    /** Create new example object, initializing with object passed to constructor */
    const example = new Example({
      bitExample: Buffer.from([0b1, 0b0]),
      tinyintExample: -128,
      tinyintExample2: 255,
      smallintExample: -32767,
      mediumintExample: -8388608,
      intExample: -2147483648,
      // bigintExample: -9223372036854775808, Gives ER_WARN_DATA_OUT_OF_RANGE error due to bug?
      doubleExample: 193448295822329038402340234.23840923804823094809234245,
      floatExample: 1927492498374.2348927395,
      decimalExample: 23.452,
      numericExample: 942.28734,
      dateExample: new Date(`1986-06-20`),
      timeExample: `-838:59:59`,
      timestampExample: new Date(`2011-07-16T04:52:23-06:00`),
      datetimeExample: new Date(`2011-07-16T04:52:23-06:00`),
      charExample: `AU`,
      charExample2: `ÄÜ`,
      varcharExample: `Varchar Example`,
      varcharExample2: null,
      binaryExample: Buffer.from([0x04, 0x7F, 0x13, 0x38]),
      varbinaryExample: Buffer.from([0x04, 0x7F]),
      tinyblobExample: Buffer.from(`I am a tiny blob up to 256 bytes`),
      blobExample: Buffer.from(`I am a bigger blob up to 65 kB`),
      mediumblobExample: Buffer.from(`I am a bigger blob up to 16 MB`),
      longblobExample: Buffer.from(`I am a bigger blob up to 4 GB`),
      tinytextExample: `I am a tiny text up to 256 bytes`,
      textExample: `I am a bigger text up to 65 kB`,
      mediumtextExample: `I am a bigger text up to 16 MB`,
      longtextExample: `I am a bigger text up to 4 GB`,
      setExample: new Set([`a`, `d`, `d`]),
      booleanExample: true,
      functionExample: (arg) => { return `I am ${arg}`; },
      plainObjectExample: { a: `I am A`, 14: `Plain Object` },
      ezobjectTypeExample: otherObj1,
      ezobjectInstanceExample: extendedObj1,
      ezobjectInstanceExample2: extendedObj3,

      bitArrayExample: [Buffer.from([0b1, 0b0]), Buffer.from([0b0, 0b1])],
      tinyintArrayExample: [-128, 128],
      tinyintArrayExample2: [0, 255],
      smallintArrayExample: [-32767, 32767],
      mediumintArrayExample: [-8388608, 8388608],
      intArrayExample: [-2147483648, 2147483648],
      bigintArrayExample: [-9223372036854775808, 9223372036854775808],
      doubleArrayExample: [-193448295822329038402340234.23840923804823094809234245, 193448295822329038402340234.23840923804823094809234245],
      floatArrayExample: [-1927492498374.2348927395, 1927492498374.2348927395],
      decimalArrayExample: [-23.452, 23.452],
      numericArrayExample: [-942.28734, 942.28734],
      dateArrayExample: [new Date(`06-20-1986`), new Date(`11-02-1909`)],
      timeArrayExample: [`-838:59:59`, `838:59:59`],
      timestampArrayExample: [new Date(`2011-07-16T04:52:23-06:00`), new Date(`2013-04-26T17:04:13-06:00`)],
      datetimeArrayExample: [new Date(`2011-07-16T04:52:23-06:00`), new Date(`2013-04-26T17:04:13-06:00`)],
      charArrayExample: [`AU`, `CD`],
      charArrayExample2: [`ÄÜ`, `CD`],
      varcharArrayExample: [`Varchar Example`, `Another Varchar Example`],
      varcharArrayExample2: [null, `Varchar Example 2`],
      binaryArrayExample: [Buffer.from([0x04, 0x7F, 0x13, 0x38]), Buffer.from([0xA3, 0x09])],
      varbinaryArrayExample: [Buffer.from([0x04, 0x7F]), Buffer.from([0xA3, 0x09, 0xDC])],
      tinyblobArrayExample: [Buffer.from(`I am a tiny blob up to 256 bytes`), Buffer.from(`I am another tiny blob up to 256 bytes`)],
      blobArrayExample: [Buffer.from(`I am a bigger blob up to 65 kB`), Buffer.from(`I am another bigger blob up to 65 kB`)],
      mediumblobArrayExample: [Buffer.from(`I am a bigger blob up to 16 MB`), Buffer.from(`I am another bigger blob up to 16 MB`)],
      longblobArrayExample: [Buffer.from(`I am a bigger blob up to 4 GB`), Buffer.from(`I am another bigger blob up to 4 GB`)],
      tinytextArrayExample: [`I am a tiny text up to 256 bytes`, `I am another tiny text up to 256 bytes`],
      textArrayExample: [`I am a bigger text up to 65 kB`, `I am another bigger text up to 65 kB`],
      mediumtextArrayExample: [`I am a bigger text up to 16 MB`, `I am another bigger text up to 16 MB`],
      longtextArrayExample: [`I am a bigger text up to 4 GB`, `I am another bigger text up to 4 GB`],
      setArrayExample: [new Set([`a`, `d`]), new Set([`a`, `c`, `d`, `d`])],
      booleanArrayExample: [false, true],
      functionArrayExample: [(arg) => { return `I am ${arg} 1`; }, (arg) => { return `I am ${arg} 2`; }],
      plainObjectArrayExample: [{ a: `I am A`, 14: `Plain Object` }, { and: `So am I too a`, 930: `Plain Object` }],
      ezobjectTypeArrayExample: [otherObj1, otherObj2],
      ezobjectInstanceArrayExample: [extendedObj1, extendedObj2],
      ezobjectInstanceArrayExample2: [extendedObj3, extendedObj4]
    });

    /** Log the initialized example object */
    console.log(`Initialized example object:`);
    console.log(`${util.inspect(example, { depth: null })}\n`);

    /** Insert example into the database */
    await example.insert(db);

    /** Get the inserted ID */
    const id = example.id();
    
    /** Create a second example object */
    const example2 = new Example();
    
    console.log(`Loading previous example by ID# ${id}...`);

    /** Attempt to load the original example from the database into example2 */
    await example2.load(id, db);
        
    /** Test stored anonymous function */
    console.log(`${example2.functionExample()(`Rich`)}\n`);
  
    /** Log the database loaded example object */
    console.log(`Database loaded example object:`);
    console.log(util.inspect(example2, { depth: null }));
    
    /** To demonstrate the ability to override the MySQL type, create config for example override */
    const exampleOverrideConfig = {
      tableName: `example_overrides`,
      className: `ExampleOverride`,
      properties: [
        { name: `id`, type: `int` },
        { 
          name: `examples`, 
          type: `array`, 
          mysqlType: `tinytext`, 
          arrayOf: { type: `Example` }, 
          saveTransform: x => x.map(y => y.id()).join(`,`), 
          loadTransform: async (x, property, db) => { 
            const arr = []; 
            
            for ( let i = 0, list = x === `` ? [] : x.split(`,`), i_max = list.length; i < i_max; i++ )
              arr.push(await (new Example()).load(parseInt(list[i]), db)); /** You can also use ezobjects.Example from anywhere */
          
            return arr; 
          }
        }
      ]
    };
    
    /** Create example override class */
    const ExampleOverride = ezobjects.createClass(exampleOverrideConfig);
    
    /** Create example overrides table if it doesn`t already exist */
    await ezobjects.createTable(exampleOverrideConfig, db);
    
    /** Create new example override */
    const exampleOverride = new ExampleOverride();
    
    /** Let's just push on the two previous example objects we created, which are both the same record */
    exampleOverride.examples().push(example);
    exampleOverride.examples().push(example2);
    
    /** Insert our example override into the database */
    await exampleOverride.insert(db);
    
    console.log(exampleOverride);
    
    /** Create another example override */
    const exampleOverride2 = new ExampleOverride();
    
    /** Load it using the ID of the previous override */
    await exampleOverride2.load(exampleOverride.id(), db);
    
    /** As you can see, the two log outputs are the same, demonstrating the success of the MySQL override and change of transforms */
    console.log(exampleOverride2);
  } catch ( err ) {
    /** Cleanly log any errors */
    console.log(err.message);
  } finally {
    /** Close database connection */
    await db.awaitEnd();
  }
})();

Contributing

Please open an issue on the GitHub repository if you find any broken functionality or other bugs/errors. Feature requests will also be accepted, but are not guaranteed to be implemented.

License

MIT Licensed

Readme

Keywords

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Install

npm i ezobjects-mysql

Repository

github.com/om-mani-padme-hum/ezobjects-mysql

Homepage

github.com/om-mani-padme-hum/ezobjects-mysql#readme

Weekly Downloads

130

Version

13.0.3

License

MIT

Unpacked Size

847 kB

Total Files

31

Last publish

Collaborators

  • om-mani-padme-hum
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