DISQLite3 - A self-contained, embeddable, zero-configuration SQL database engine for Delphi

DISQLite3 implements a self-contained, embeddable, zero-configuration SQL database engine for Delphi (Embarcadero / CodeGear / Borland).

Features include:

• ACID transactions, even after system crashes and power failures.
• Zero-configuration – no setup or administration needed.
• Implements most of SQL-92.
• A complete database is stored in a single disk file.
• Supports terabyte-sized databases and gigabyte-sized strings and blobs. Self-contained: no external dependencies, no DLLs.
• Small footprint and smart linking: Only required code is compiled in, adding as little as 300 KB code space only.
• Full Text Search (FTS) with customizable tokenizer, prefix matching, and optional word stemming for 15 languages.
• Database AES encryption with SHA256 key generator.
• Db.pas is not required, which allows DISQLite3 to compile with all flavours of Delphi, including Delphi Standard and Delphi Personal.
• Faster than popular database engines for most common operations.
• Simple, easy to use API.
• Database files created with DISQLite3 can also be accessed by Linux and MacOS using the SQLite3 libraries.

SQL-92 Support

DISQLite3 understands most of the SQL-92 language standard:

• ALTER TABLE
• ANALYZE
• ATTACH DATABASE
• BEGIN TRANSACTION
• Comments
• COMMIT TRANSACTION
• CREATE INDEX
• CREATE TABLE
• CREATE TRIGGER
• CREATE VIEW
• DELETE
• DETACH DATABASE
• DROP INDEX
• DROP TABLE
• DROP TRIGGER
• DROP VIEW
• END TRANSACTION
• EXPLAIN
• Expressions
• INSERT
• ON CONFLICT clause
• PRAGMA
• REINDEX
• REPLACE
• ROLLBACK TRANSACTION
• SELECT
• UPDATE
• VACUUM

The complete SQL syntax is described in full length in the DISQLite3 HTML Help, part of the installation package.

Simple Programming Interface

DISQLite3 provides a comprehensive list of functions and procedures to manage database records with ease and efficiency. It includes the full SQLite3 functionality, plus a number of Delphi specific extras:

• AnsiString, UnicodeString / WideString, and Variant support.
• Database and Statement wrapper classes.
• TDataSet support.
• TStream support for BLOBs.
• Growing number of Delphi example projects.

Despite of its rich set of features, a DISQLite3 database application can be realized with just three different function calls.

Pro and Personal Editions

DISQLite3 comes in two editions: DISQLite3 Personal and DISQLite3 Pro.

DISQLite3 Personal is free for personal, educational, and non-commercial use. It omits some functionality of DISQLite3 Pro, but does not compromize on essential features like ACIDtransactions, virtually unlimited database size, full text search, and others.

DISQLite3 Pro is required for commercial use and may be purchased online. It adds functionality usually desired by advanced users. This includes SQL triggers and views, arbitrary encryption passwords, user-defined SQL functions, and more. Since DISQLite3 Pro is fully compatible to the Personal edition, it is possible to upgrade existing projects without any code changes.

A feature chart is available for a side-by-side comparison of the two editions.

This table lists the features of the free¹⁾ DISQLite3 Personal vs. the commercial DISQLite3Pro editions.

Feature	DISQLite3 Personal	DISQLite3 Pro
Windows 64-bit support		Yes
SQL-92 Compatible Syntax	Yes	Yes
Single File Database	Yes	Yes
Compact, Variable-Length File Format	Yes	Yes
Maximum Database Size	2 TB	2TB
Maximum Number of Tables	Unlimited	Unlimited
Maximum Number of Columns per Table	Unlimited	Unlimited
Maximum Length of Column Name	Unlimited	Unlimited
Maximum Number of Indexes	Unlimited	Unlimited
Maximum Amount of Data per Row	Unlimited	Unlimited
Compiles into Application EXE, requires no DLLs	Yes	Yes
Indexed Full Text Search with prefix matching (like "run*") andoptional word stemming	Yes	Yes
SQL Parameter Binding (?, :ParamName)	Yes	Yes
Database Locking	Yes	Yes
Database Transactions and Rollback	Yes	Yes
Database Schema PRAGMAs	Yes	Yes
Multiple, Simultaneous SELECT Operations	Yes	Yes
Database Encryption	Single Password	Any Password
CHECK constraints		Yes
SQL ANALYZE command		Yes
SQL OR optimization		Yes
SQL BETWEEN optimization		Yes
SQL LIKE optimization		Yes
SQL INSERT allows multiple rows		Yes
Default Column Values	Yes	Yes
Floating-Point Support	Yes	Yes
Date and DateTime Functions	Yes	Yes
User-Defined Collation Sequences		Yes
User-Defined Database Functions and Aggregates		Yes
ALTER TABLE SQL Command		Yes
Authorization Callback Feature		Yes
PRIMARY KEY Columns	Yes	Yes
Autoincementing PRIMARY KEY columns (may reuse ROWIDs from deleted records)	Yes	Yes
AUTOINCREMENT keyword (monotonically increasing ROWIDs, guaranteed to be unique over the entire database lifetime)		Yes
VACUUM Clause, Auto-Vacuum Feature		Yes
BLOB Literal SQL Syntax X'ABCD'		Yes
Incremental BLOB API		Yes
CAST ( expr AS type )		Yes
Temporary Tables		Yes
Compound SELECTs (UNION, UNION ALL, INTERSECT, EXCEPT)		Yes
ON CONFLICT SQL Clause		Yes
EXPLAIN SQL Clause		Yes
Database Integrity Check		Yes
FOREIGN KEY constraints		Yes
In-Memory Database		Yes
Hot Database Backup		Yes
Trace Callback Feature for SQL Logging and Debugging		Yes
Commit Transaction Callback Feature		Yes
Progress Callback Feature		Yes
REINDEX SQL Clause		Yes
PRAGMA Database Options		Yes
Sub-Queries, Sub-Selects, IN() Operator		Yes
Automatic Database Triggers		Yes
UTF-8 / Utf8String API	Yes	Yes
UTF-16 / UnicodeString / WideString API		Yes
Views, Triggers on Views		Yes
ATTACH multiple databases		Yes
SQL tracing and performance profiling		Yes
Shared Cache between multiple open DB connections		Yes
Asynchronous I/O background thread writing		Yes
R-Tree index for geospatial data systems		Yes
Write-Ahead Logging (WAL) for improved performance and concurrency		Yes
Multiple worker threads		Yes

¹⁾ Free for personal, educational, and non-commercial use. See license for details.