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.

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.
 

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