TjDB - Lightweight and easy to use database program

Version 2.1.0 - Now features data types

Creating & Saving the DB

• To create a DB you first have to require the tjdb package like so:

  • const tjdb = require("tjdb");

• Next, create the db variable by initizlizing the tjdb object - The one paramater is the DB name (Must end in .tjdb)

  • var db = new tjdb("test.tjdb");

• Finally, the database automatically saves, so there is no need to save manually

Tables

• To create a table use method createTable(tableName, columns) - tableName: Name of table to create, columns: Array of columns to create

  • Ex. db.createTable("test", ["col1", "col2"]);

  Note the colon character ":" is forebidden in column names

  To add data types change the column name to include one of the valid types seen here: ["number", "string", "boolean", "null", "symbol", "function", "object", "array"];

  • Ex. `db.createTable("test", ["col1:number", "col2:string"]);
  • All columns that do not include data types will accept anything

• To delete a table use method deleteTable(tableName) - tableName: Name of the table to delete

  • Ex. db.deleteTable("test");

Inserting Data

• To insert a single row, use method insertSingle(tableName, values) - tableName: Name of table to insert the row into, values: An array with the same number of items as the number of columns

  • Ex. db.insertSingle("test", [1, 2]);
  • Please note, it is much more efficent to use insertMultiple() when inserting large amounts of data

• To Insert multiple rows, use mehtod insertMultiple(tableName, values) - tableName: Name of table to insert the rows into, values: An array of arrays each containing values

  • Ex. db.insertMultiple("test", [[3, 4], [5, 6]]);
  • The current DB should look like this: {"test": "col1": [1, 3, 5], "col2": [2, 4, 6]}

Getting Data

• To get the entire DB in JSON format, use method getAll() - No Paramaters

  • Ex. db.getAll();

• To get all the data in a single table, use method getTable(tableName) - tableName: Name of table to get the data from

  • Ex. db.getTable("test");

• To get all the data in a single column, use method getColumn(tableName, columnName) - tableName: Name of table to look in, columnName: name of column to get the data from

  • Ex. db.getColumn("test", "col1");

• To return a single item, use method getSingle(tableName, returnColName, options) - tableName: Name of table to look in, returnColName: Name of column to retrive the data from, options: JSON specifying which column to look in and find the data from {name: name of the column, value: value to look for}

  • Ex. db.getSingle("test", "col2", { name: "col1", value: 1 });
  • This should return the value: 2

• To get a row of data, use method getRow(tableName, location) - tableName: Name of table to look in, location: Object dicating where to find the row { name: name of column to look in, value: Value to look for }

  • Ex. db.getRow("test", { name: "col1", value: 1 });
  • This should return the array (row) [1, 2]

Updating The DB

• To delete a single column, use method deleteColumn(tableName, colName) - tableName: Name of table to look in, colName: Name of table to delete

  • Ex. db.deleteColumn("test", "col2");

• To insert a new column, use method insertColumn(tableName, colName) - tableName: Name of table to look in, colName: Name of the new column to create

  • Ex. db.insertColumn("test", "col2");

• To update a single value, use method updateValue(tableName, colName, value, newValue) - tableName: Name of table to look in, colName: Name of column to look in, value: The value to replace in that column, newValue: the value to replace it with

  • Ex. db.updateValue("test", "col1", 5, 7);
  • This would change the value of 5 in the column to 7

• To delete a single value, use method deleteSingle(tableName, colName, value, completeDeletion = false) - tableName: Name of table to look in, colName: Name of column to look in, value: the value to delete, completeDeletion (Default false), if true, the value is completely spliced from the DB, but if it is false, it will just replace it with null

  • Ex. db.deleteSingle("test", "col1", 3, true)
  • col1 will now look like this [1, 7]

• To delete a single row, use method deleteRow(tableName, options) - tableName: Name of table to look in, options: location of the row { name: Name of column to look in, value: value to look for }

  • If the db looks like this {"test": "col1": [1, 3, 5], "col2": [2, 4, 6]}
  • Ex. db.deleteRow("test", { name: "col1", value: 1 });
  • The DB will now look like this {"test": "col1": [3, 5], "col2": [4, 6]}

Extra Functions

• To visulalize the DB, use method visualize(options = { keysColor: 'cyan', stringColor: 'yellow', numberColor: 'magenta' }) - options: Object which sets the properties to print, see https://www.npmjs.com/package/prettyjson for formating options

  • Ex. console.log(db.visualize());

• To Normaliz (fill) the DB, use method normalize(newValue = null, tableName = null) - newValue: the value to add in to replace empty spaces, YOU MUST SPECIFIY THE TABLE, OTHERWISE IT WILL DO THE ENTIRE DB tableName: Name of table to normalize, default is the entire DB

  • Ex. db.normalize(null, "test");
  • If the original DB looked like this {"test": "col1": [3], "col2": [4, 6]}, it would now look like this: {"test": "col1": [3, null], "col2": [4, 6]}