6. Dynamic Columns | MariaDb Essentials

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MariaDb Essentials

By : Emilien Kenler

4.5 (2)

MariaDb Essentials

4.5 (2)

By: Emilien Kenler

Overview of this book

This book will take you through all the nitty-gritty parts of MariaDB, right from the creation of your database all the way to using MariaDB’s advanced features. At the very beginning, we show you the basics, that is, how to install MariaDB. Then, we walk you through the databases and tables of MariaDB, and introduce SQL in MariaDB. You will learn about all the features that have been added in MariaDB but are absent in MySQL. Moving on, you’ll learn to import and export data, views, virtual columns, and dynamic columns in MariaDB. Then, you’ll get to grips with full-text searches and queries in MariaDb. You’ll also be familiarized with the CONNECT storage engine. At the end of the book, you’ll be introduced to the community of MariaDB.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Installing MariaDB

1. Installing MariaDB

Choosing a MariaDB version

Installing MariaDB

Starting and stopping MariaDB

Getting started with the mysql client

Configuring MariaDB

Upgrading MariaDB

Managing plugins

Summary

2. Databases and Tables

2. Databases and Tables

Working with databases

Working with tables

Working with columns

Storage engines

Indexing

Using comments

Working with metadata

Creating an installation script

Summary

3. Getting Started with SQL

3. Getting Started with SQL

Working with rows

Understanding transactions

Foreign keys

Dealing with duplicates and consistency errors

Reading rows

Joining tables

Working with operators

Working with times and dates

Using comments to annotate your database schema

Summary

4. Importing and Exporting Data

4. Importing and Exporting Data

The basics of importing and exporting data

Creating and importing CSV files

Creating and importing a dump file

Speeding up data import

Summary

5. Views and Virtual Columns

5. Views and Virtual Columns

Views

Virtual and persistent columns

Summary

6. Dynamic Columns

6. Dynamic Columns

The problem: storing non-homogeneous data

Dynamic columns

Summary

7. Full-Text Searches

7. Full-Text Searches

Defining a full-text search

Full-text searches in MySQL and MariaDB

Working with full-text indexes

Full-text queries

Mroonga

Connecting MariaDB to Sphinx

Summary

8. Using the CONNECT Storage Engine

8. Using the CONNECT Storage Engine

Understanding the CONNECT storage engine

Accessing CSV files

Accessing XML and HTML files

Using the XCOL table type

Using the OCCUR table type

Using the PIVOT table type

The MariaDB community

MariaDB resources

Included storage engines

Summary

Index

Index

Dynamic columns

Those who know languages similar to JavaScript can think of a dynamic column set as a dynamic object stored in the database in a binary format. Those who don't fully understand what a dynamic object is can think of dynamic column sets as column containers. At every moment it is possible to add or drop columns from these containers, as well as read them or get a list of columns. A dynamic column is a single attribute that can be created or manipulated in a set. This feature is a good way of storing non-homogeneous data in the same table.

Note

Dynamic columns were introduced in MariaDB 5.3, and were notably improved in MariaDB 10.0. This chapter only discusses the MariaDB 10.0 implementation.

Creating the dynamic columns container

A dynamic column needs to be stored in a binary column. This column can be of type TINYBLOB, BLOB, MEDIUMBLOB, or LONGBLOB. If the set can be empty, we will declare the column as NULL, because the NULL value is the only way to represent an empty dynamic...

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